View Poll Results: Will polishing the inside of an intake manifold improve performance?
Yes, it will improve performance
0
0%
No, it won’t do anything at all
3
100.00%
No, it will reduce performance
0
0%
Voters: 3. You may not vote on this poll
D17VTECPOWER threads consolidated - how a member should not behave
02-26-2018
#1051
If you think a good mechanic is expensive, try hiring a bad one
Re: High RPM on the highway
I can't predict the future, man.
The ECM or PCM limits the maximum engine RPM so it won't hurt itself, by design
The engine is designed to run from idle to redline and do it all day long.
The vast majority will do this without fail.
Those are the good ones
The ECM or PCM limits the maximum engine RPM so it won't hurt itself, by design
The engine is designed to run from idle to redline and do it all day long.
The vast majority will do this without fail.
Those are the good ones
02-26-2018
#1054
If you think a good mechanic is expensive, try hiring a bad one
Re: Can I “regear” my transmission?
Instead.......Fix the trans that won't upshift to 4th
02-27-2018
#1056
Homemade waterless wash spray
I got sick of paying for waterless wash spray, so I decided to make my own. What I did is I found an empty spray bottle, washed it out, and mixed 1 ounce of Meguiars Ultimate Wash And Wax with 16 ounces of distilled water and I put it in the spray bottle. You may be able to use faucet water, but I chose distilled water because I didn’t know if faucet water would leave streaks. I tried this homemade waterless wash on my filthy car, and it works great. I just spray a section, and wipe it off with a microfiber towel. I tried it on the rest of the car, and it it worked perfectly. It doesn’t leave any streaks, and it’s easy to use. Anyway, I just wanted to share my discovery with everyone in case they are buying expensive waterless wash spray to clean their car.
02-27-2018
#1057
OF top 99.5% creator (Formerly of the Puffinblunts variety)
Re: High RPM on the highway
This is why I inquired if you followed clearance specs when you rebuilt the engine. May or may not be the issue but by not doing so... it's a guess to the effect of it's current condition.
02-27-2018
#1058
OF top 99.5% creator (Formerly of the Puffinblunts variety)
Re: Homemade waterless wash spray
I've been using a 10 (distilled water) to 1 (vinegar) spray for the past couple years for almost daily hard water sprinkler spots.
Use a spray on wax once every two weeks. No garage...condo life.
Use a spray on wax once every two weeks. No garage...condo life.
02-27-2018
#1059
Re: High RPM on the highway
I think the engine would have failed by now if it was going to. I didn’t have much time to do the rebuild, since the engine blew up. I didn’t have a way to check clearances and I didn’t have time or money to have a machine shop do it, so I don’t know what the clearances are. However, the engine runs very well and doesn’t make any unusual noises. I even pulled a U Haul trailer that weighed over 2500 pounds over 500 miles with this car when I moved, and the car pulled it no problem. I hit the rev limiter many times when flooring it, and nothing broke yet, so I don’t have any reason to believe that the clearances are out of spec.
02-27-2018
#1061
OF top 99.5% creator (Formerly of the Puffinblunts variety)
Re: High RPM on the highway
Not necessarily.....could be slightly out of spec that will cause gradual bearing wear and possible oil loss. Hopefully not the case but my point is..you have no way of knowing that because specs weren't confirmed.
02-27-2018
#1062
OF top 99.5% creator (Formerly of the Puffinblunts variety)
Re: Homemade waterless wash spray
It does and that's why I wax it often. There's a large oak tree near my parking space and dew, rain can drip from its' leaves for several hours that also leave calcium spots on my car...more so than from sprinklers.
02-27-2018
#1063
If you think a good mechanic is expensive, try hiring a bad one
Re: Can I “regear” my transmission?
There's a good chance you may not gain any fuel economy with your plan.
02-27-2018
#1064
Re: Can I “regear” my transmission?
Why wouldn’t running at a lower RPM on the highway save fuel? Wouldn’t running at 2000 RPM instead of 2500 RPM mean less losses? The faster the engine is spinning, the more energy is wasted from internal friction as the crankshaft spins, pistons go up and down, the valvetrain gets actuated, etc. There will also be more losses from spinning the oil pump, water pump, P/S pump, alternator, trans fluid pump, etc more times per mile. Can you please explain why I might not gain highway MPG from this plan? People on Ecomodder have gained MPG from regearing for lower cruising RPM.
02-27-2018
#1065
Re: High RPM on the highway
i would be careful driving it at those speeds,
years ago i had a high revving issue like that (in a different vehicle) and all of a sudden cruising at 60mph the trans downshifted to first gear and nearly put my head through the windshield....thank god i had my seat belt on
years ago i had a high revving issue like that (in a different vehicle) and all of a sudden cruising at 60mph the trans downshifted to first gear and nearly put my head through the windshield....thank god i had my seat belt on
02-27-2018
#1066
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Re: Can I “regear” my transmission?
Why wouldn’t running at a lower RPM on the highway save fuel? Wouldn’t running at 2000 RPM instead of 2500 RPM mean less losses? The faster the engine is spinning, the more energy is wasted from internal friction as the crankshaft spins, pistons go up and down, the valvetrain gets actuated, etc. There will also be more losses from spinning the oil pump, water pump, P/S pump, alternator, trans fluid pump, etc more times per mile. Can you please explain why I might not gain highway MPG from this plan? People on Ecomodder have gained MPG from regearing for lower cruising RPM.
on a 4cyl, the HP and TQ is pretty low at 2000 rpm compared to 2500rpm. because of this the 500 rpm drop, engine load to maintain speed will increase(lugging). it will require more air, fuel, and a higher throttle position to maintain speed
notice how much the graph climbs in that 500 rpm
random 2012 civic turbo dyno just for illustration purposes
this is a screen grab showing how i have adjusted the spark table on my mustang.
notice how as load increases, spark decreases. if that 500rpm drop causes your load to increase from 10% to 30% to maintain speed, you're squirting more fuel and losing 10° of timing. you also must realize that the wasted energy spinning the oil pump, water pump, P/S pump, alternator, trans fluid pump, etc 500 measly rpm at 2500 is not causing a loss you could ever measure. if you deleted the spinning the oil pump, water pump, P/S pump, alternator, trans fluid pump, etc from the equation at 6500rpm you might free up what like 10hp? so at 2500 rpm vs 2000 rpm, the (maybe) 0.25hp difference is more than offset by the increased load.
personally i feel that some of the ecomodder crowd is a bit nuts, lies, etc, and that if your car would get better MPG at highway speed with the taller gear, honda would have built it that way. they are smarter than us. lowering the car a bit, lowering the front air dam, and adding more air to the tires would net you more economy. IMO. they post 80 mpg but at what cost? tailgating semi's, coasting and shutting off the car, rolling the last 400' at the grocery store with no power brakes before parking, etc.
besides, you deleted power steering already, so you should scratch that off the list. a power steering delete on my 92 mustang would only add 4hp at 6250 rpm and deleting the AC was not even measureable. i looked into it in my quest for speed
Last edited by RobertD; 02-27-2018 at 12:00 PM. Reason: i edit everything
02-27-2018
#1067
Re: Can I “regear” my transmission?
i'll take a shot at it.
on a 4cyl, the HP and TQ is pretty low at 2000 rpm compared to 2500rpm. because of this the engine is seeing increased load. it will require more air, fuel, and a higher throttle position to maintain speed
notice how much the graph climbs in that 500 rpm
Attachment 112011
random 2012 civic turbo dyno just for illustration purposes
this is a screen grab showing how i have adjusted the spark table on my mustang.
Attachment 112010
notice how as load increases, spark decreases. if that 500rpm drop causes your load to increase from 10% to 30% to maintain speed, you're squirting more fuel and losing 10° of timing. you also must realize that the wasted energy spinning the oil pump, water pump, P/S pump, alternator, trans fluid pump, etc 500 measly rpm at 2500 is not causing a loss you could ever measure. if you deleted the spinning the oil pump, water pump, P/S pump, alternator, trans fluid pump, etc from the equation at 6500rpm you might free up what like 10hp? so at 2500 rpm vs 2000 rpm, the (maybe) 0.25hp difference is more than offset by the increased load.
personally i feel that some of the ecomodder crowd is a bit nuts, lies, etc, and that if your car would get better MPG at highway speed with the taller gear, honda would have built it that way. they are smarter than us. lowering the car a bit, lowering the front air dam, and adding more air to the tires would net you more economy. IMO
on a 4cyl, the HP and TQ is pretty low at 2000 rpm compared to 2500rpm. because of this the engine is seeing increased load. it will require more air, fuel, and a higher throttle position to maintain speed
notice how much the graph climbs in that 500 rpm
Attachment 112011
random 2012 civic turbo dyno just for illustration purposes
this is a screen grab showing how i have adjusted the spark table on my mustang.
Attachment 112010
notice how as load increases, spark decreases. if that 500rpm drop causes your load to increase from 10% to 30% to maintain speed, you're squirting more fuel and losing 10° of timing. you also must realize that the wasted energy spinning the oil pump, water pump, P/S pump, alternator, trans fluid pump, etc 500 measly rpm at 2500 is not causing a loss you could ever measure. if you deleted the spinning the oil pump, water pump, P/S pump, alternator, trans fluid pump, etc from the equation at 6500rpm you might free up what like 10hp? so at 2500 rpm vs 2000 rpm, the (maybe) 0.25hp difference is more than offset by the increased load.
personally i feel that some of the ecomodder crowd is a bit nuts, lies, etc, and that if your car would get better MPG at highway speed with the taller gear, honda would have built it that way. they are smarter than us. lowering the car a bit, lowering the front air dam, and adding more air to the tires would net you more economy. IMO
02-27-2018
#1068
If you think a good mechanic is expensive, try hiring a bad one
Re: Can I “regear” my transmission?
Just removing the alternator can improve gas mileage 5-10%
No idea how much power the oil and water pumps draw, but it’s probably measurable.
BTW, Electric water pumps are a real thing these days.
As for the effect that internal friction has on fuel consumption, it’s quite significant. Even with the spark plugs out, turning the engine over takes a noticible amount of torque just from internal friction. I’ve heard that 20-30% of the fuel an engine uses is used to overcome internal friction, and I believe it.
It takes power to run an engine against the restriction of a throttle.
Remove the throttle valve restriction and they can gain efficiency
These days EGR is mainly used to reduce pumping losses
There is more than one method engineers can use to attain EGR effect too.
02-27-2018
#1069
Re: Can I “regear” my transmission?
Enter: Hondas ELD charging system
Right. Just delete both of those and see how much further you can go.
BTW, Electric water pumps are a real thing these days.
Not just internal friction like parts that slide against each other....
It takes power to run an engine against the restriction of a throttle.
Remove the throttle valve restriction and they can gain efficiency.
These days EGR is mainly used to reduce pumping losses
There is more than one method engineers can use to attain EGR effect too.
Right. Just delete both of those and see how much further you can go.
BTW, Electric water pumps are a real thing these days.
Not just internal friction like parts that slide against each other....
It takes power to run an engine against the restriction of a throttle.
Remove the throttle valve restriction and they can gain efficiency.
These days EGR is mainly used to reduce pumping losses
There is more than one method engineers can use to attain EGR effect too.
02-27-2018
#1070
If you think a good mechanic is expensive, try hiring a bad one
Re: Can I “regear” my transmission?
If you could build to seriously raise engine torque at such a low RPM, you might be on to something..... But I don't see a D17 doing that, sooooooo
/pipe dream
02-28-2018
#1071
Re: Can I “regear” my transmission?
But as already stated (did he actually say that???), in the case of you wanting to re-gear for lower highway RPM, you would drop the engine out of its powerband and that would likely negate any possible gains in fuel economy.
If you could build to seriously raise engine torque at such a low RPM, you might be on to something..... But I don't see a D17 doing that, sooooooo
/pipe dream
If you could build to seriously raise engine torque at such a low RPM, you might be on to something..... But I don't see a D17 doing that, sooooooo
/pipe dream
03-01-2018
#1072
NOT happy with DC Sports!
I found a used DC Sports 4-1 header in like new condition for $25. However, it cracked in more than 1 place 3 months later. I called DC Sports, and I asked them if this is covered under warranty. I was very clear that the header is used, and he said it’s still covered under warranty even though it’s used as long as I have a valid receipt, which I do, since it should not have cracked either way. He asked me to send pictures, so I pulled the header off and sent several pictures of the cracks. He then said that I must be the original owner of the header for it to be covered under warranty, which I understand. What I’m NOT okay with is that he said that he said it’s covered under warranty after I was 100% upfront with him that the header is used. So his mistake, misinformation, lie, whatever you want to call it caused me to spend the time taking the header off to get pictures, emailing him the pictures, and then getting told that this isn’t covered under warranty, causing me to have to put the header back on. I emailed him back 2 times to let them know that I’m not happy and I would appreciate them making this right. No response. If he just told me from the start that it wasn’t covered under warranty, I wouldn’t be mad. I’m mad because he gave me incorrect information, causing me to waste my time pulling the header off to get pictures, emailing the pictures to him, and then having to put the header back on, after he ignored 2 emails expressing my dissatisfaction. So if anyone is considering buying a DC Sports product, you may want to reconsider buying from them since they clearly have no integrity.
03-01-2018
#1073
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Join Date: Feb 2018
Location: Forest Park, IL
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Rep Power: 78 Re: NOT happy with DC Sports!
i ASSume he thought you meant "used" by you since new, which is what i thought until i read your post again. i wouldn't warranty it either. header warranties are usually VERY specific
i'd be more interested to know why did they crack? is it a chinese knock off? do you cruise lean or have a lean bias on the hego's to increase MPG? missing brackets that take stress off the flange? bottom out a lot from being lowered? flimsy engine mounts? header used on a new engine during breakin?
IMO headers are disposable. i voided my BBK warranty and i haven't even used them yet. with how i butchered mine and with the way i have my o2's set for lean bias, i'll be shocked if mine aren't cracked in a year.
i understand the feeling though, when my radiator sprung a leak AFCO voided the lifetime warranty on my racing radiator warranty because i used antifreeze.
i'd be more interested to know why did they crack? is it a chinese knock off? do you cruise lean or have a lean bias on the hego's to increase MPG? missing brackets that take stress off the flange? bottom out a lot from being lowered? flimsy engine mounts? header used on a new engine during breakin?
IMO headers are disposable. i voided my BBK warranty and i haven't even used them yet. with how i butchered mine and with the way i have my o2's set for lean bias, i'll be shocked if mine aren't cracked in a year.
i understand the feeling though, when my radiator sprung a leak AFCO voided the lifetime warranty on my racing radiator warranty because i used antifreeze.
03-01-2018
#1074
Re: NOT happy with DC Sports!
i ASSume he thought you meant "used" by you since new, which is what i thought until i read your post again. i wouldn't warranty it either. header warranties are usually VERY specific
i'd be more interested to know why did they crack? is it a chinese knock off? do you cruise lean or have a lean bias on the hego's to increase MPG? missing brackets that take stress off the flange? bottom out a lot from being lowered? flimsy engine mounts? header used on a new engine during breakin?
IMO headers are disposable. i voided my BBK warranty and i haven't even used them yet. with how i butchered mine and with the way i have my o2's set for lean bias, i'll be shocked if mine aren't cracked in a year.
i understand the feeling though, when my radiator sprung a leak AFCO voided the lifetime warranty on my racing radiator warranty because i used antifreeze.
i'd be more interested to know why did they crack? is it a chinese knock off? do you cruise lean or have a lean bias on the hego's to increase MPG? missing brackets that take stress off the flange? bottom out a lot from being lowered? flimsy engine mounts? header used on a new engine during breakin?
IMO headers are disposable. i voided my BBK warranty and i haven't even used them yet. with how i butchered mine and with the way i have my o2's set for lean bias, i'll be shocked if mine aren't cracked in a year.
i understand the feeling though, when my radiator sprung a leak AFCO voided the lifetime warranty on my racing radiator warranty because i used antifreeze.
03-01-2018
#1075
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Rep Power: 78 Re: NOT happy with DC Sports!
i would assume if it cracked there, it's due to rapid cooling. snow, water, hitting it repeatedly, etc.. the quenching makes it brittle and the tubes grow/shrink/change temperature faster than the thicker welds around them. either way though, that sucks it cracked.
pretty cool about the radiator. i'll have to try the mishimoto if i can't get my radiator fixed locally. i spent so much time getting the fan wired up with no zip ties and trimmed it's shroud to perfectly fit that specific radiator. the right side tank leaks where the tubes fit in.
made a thread about the build. to see the pics you need the photo bucket fixed installed in your browser. http://sbftech.com/index.php?topic=36684.0
pretty cool about the radiator. i'll have to try the mishimoto if i can't get my radiator fixed locally. i spent so much time getting the fan wired up with no zip ties and trimmed it's shroud to perfectly fit that specific radiator. the right side tank leaks where the tubes fit in.
made a thread about the build. to see the pics you need the photo bucket fixed installed in your browser. http://sbftech.com/index.php?topic=36684.0
03-01-2018
#1076
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Re: NOT happy with DC Sports!
?
I understood your post as saying it was used, but not specifically if it was bought used from another person.
above statement shouldn't matter for the person that actually bought it new - so this thread will not matter to who bought it new, only to who bought it used from another person...
I understood your post as saying it was used, but not specifically if it was bought used from another person.
above statement shouldn't matter for the person that actually bought it new - so this thread will not matter to who bought it new, only to who bought it used from another person...
03-01-2018
#1077
Re: NOT happy with DC Sports!
?
I understood your post as saying it was used, but not specifically if it was bought used from another person.
above statement shouldn't matter for the person that actually bought it new - so this thread will not matter to who bought it new, only to who bought it used from another person...
I understood your post as saying it was used, but not specifically if it was bought used from another person.
above statement shouldn't matter for the person that actually bought it new - so this thread will not matter to who bought it new, only to who bought it used from another person...
03-01-2018
#1079
Administrator
Hey! Look At Me!! I'm a Supporting Member!!
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Rep Power: 485 Re: NOT happy with DC Sports!
So.. you have it on record (email) that the dude said even if you were the second owner, they'll cover it under warranty? I personally would have brought up that little tidbit of information, not just leave it at that. Just my 2 cents.
03-01-2018
#1080
If you think a good mechanic is expensive, try hiring a bad one
Re: NOT happy with DC Sports!
You only spent $25?
"USED" can mean different things to different people. Used at first glance means it's not new, and the guy on the other end of the phone expects a claim on a part that has been in use.
AND you SAY you understand that?
Person took your explanation at face value as HE understood it, but still told you warranty only applies to the original purchaser.
You are not the original purchaser!
No warranty, no matter.
You're only out $25.
Quitcherbitchin!
NEXT!
Why didn't you take pictures with the header bolted to the engine? Why did you bother to bolt the broken header back on? Why didn't you buy a brand new one to replace it....that comes with a full warranty that applies to the original purchaser??
"USED" can mean different things to different people. Used at first glance means it's not new, and the guy on the other end of the phone expects a claim on a part that has been in use.
I must be the original owner of the header for it to be covered under warranty, which I understand
So his mistake, misinformation, lie,
You are not the original purchaser!
No warranty, no matter.
You're only out $25.
Quitcherbitchin!
NEXT!
Why didn't you take pictures with the header bolted to the engine? Why did you bother to bolt the broken header back on? Why didn't you buy a brand new one to replace it....that comes with a full warranty that applies to the original purchaser??
