9psi without alcy?
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From: Arizona
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9psi without alcy?
I have an EX with all the supporting mods and have 93 octane at every gas station where i live...
I've been told by 2 diff 7thgen boosted owners, they've run 9 (one ran 10) without detonation and one doesn't even have alcohol injection, the other didn't use it.
If I run 9psi, without the alcohol, on my EX and iridium plugs on 93 octane, anyone think this will be fine. One of the members is very knowledgeble and he sounded pretty confident.
I've been told by 2 diff 7thgen boosted owners, they've run 9 (one ran 10) without detonation and one doesn't even have alcohol injection, the other didn't use it.
If I run 9psi, without the alcohol, on my EX and iridium plugs on 93 octane, anyone think this will be fine. One of the members is very knowledgeble and he sounded pretty confident.
BOOST JUNKY
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From: Wide Open Throttle
Rep Power: 0 What about timing retard?? What injectors are they using?? What about fuel???
Just wondering. Cause, I don't think it's absolutely impossible, but from what I understand detonation is possible at 10PSi and can be quite likely.
I'd just be worried bout fuel for the most part. Guess the only way to know for sure is to give it a whirl. Let us know, how it goes if ya do and good luck. Just keep close attention to how the car reacts/acts.
Just wondering. Cause, I don't think it's absolutely impossible, but from what I understand detonation is possible at 10PSi and can be quite likely.
I'd just be worried bout fuel for the most part. Guess the only way to know for sure is to give it a whirl. Let us know, how it goes if ya do and good luck. Just keep close attention to how the car reacts/acts.
Thread Starter
Joined: Sep 2002
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From: Arizona
Rep Power: 326 well here's the thing... i have the sf kit... as the psi goes up, so does the fuel, so the mixture will always be right...
i just worry about my ignition i guess...
they were both using stock injectors. one with sf fuel system, one with greddy emanage, return conversion and fpr.
i just worry about my ignition i guess...
they were both using stock injectors. one with sf fuel system, one with greddy emanage, return conversion and fpr.
Joined: Sep 2001
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From: Woostah
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You would need to retard the timing if you planned on running the SF FMU and 10lbs without the injection...
The fuel issue SpdRcrChk was talking about is the capacity of the fuel pump and fuel injectors. They both will reach a point where they cannot supply more fuel... You can run a 20:1 FMU all you want but it won't work unless the pump and injectors can supply the fuel...
The fuel issue SpdRcrChk was talking about is the capacity of the fuel pump and fuel injectors. They both will reach a point where they cannot supply more fuel... You can run a 20:1 FMU all you want but it won't work unless the pump and injectors can supply the fuel...
Hey! Look At Me!! I'm a Supporting Member!!
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I'm one of the ones who said they did 9-10psi.
I did it with the return conversion and all that. But I did note that I raised the fuel pressure to do that and so I ran it rich. Before I even went to 10... I checked to make sure I was good for 6,7,8, and 9psi individually. I had no problems or signs of detonation or anything. No change to timing or injectors. But it was a one time deal that I did that. I'd say if you seriously wanted to run it, you should go to a dyno and be sure it's right. I'm just saying that I didn't have any problems when I did. I can't say what would have happened if I kept it up.
I did it with the return conversion and all that. But I did note that I raised the fuel pressure to do that and so I ran it rich. Before I even went to 10... I checked to make sure I was good for 6,7,8, and 9psi individually. I had no problems or signs of detonation or anything. No change to timing or injectors. But it was a one time deal that I did that. I'd say if you seriously wanted to run it, you should go to a dyno and be sure it's right. I'm just saying that I didn't have any problems when I did. I can't say what would have happened if I kept it up.
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From: OKC, Oklahoma, US
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I run 10psi pretty frequently, but I have an additonal injector system, so my stock injectors do not max out. Even at this, on a cold day it's not safe because colder air=denser=needs more fuel, and this is about the limit of the stock fuel pump. So I rarely go above 8psi when it's cold out, but in summer and spring I run 10psi without any problems.
BOOST JUNKY
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From: Wide Open Throttle
Rep Power: 0 Originally posted by Havok2K1
The fuel issue SpdRcrChk was talking about is the capacity of the fuel pump and fuel injectors. They both will reach a point where they cannot supply more fuel... You can run a 20:1 FMU all you want but it won't work unless the pump and injectors can supply the fuel...
The fuel issue SpdRcrChk was talking about is the capacity of the fuel pump and fuel injectors. They both will reach a point where they cannot supply more fuel... You can run a 20:1 FMU all you want but it won't work unless the pump and injectors can supply the fuel...
I was discussing that today w/my b/f and we're both wary of bumping to 10 psi on stock injectors. But....as it's been mentioned, a return fuel conversion w/FP and FPR and aftermarket injectors would definitely help.
The compression is relevant too, but I don't think 10PSi on 9.5:1 would be unfathomable. Just...like it's been mentioned a thousand times...tuning!
Skyline R33
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From: Houston, TX
Rep Power: 0 I dont want to argue. But how did "torque king" run 14psi and two occasions w/ no problems. He also ran 12psi several times also w/ no problems. He was running the stock SF kit w/alch. I ran 14psi on accident and checked for blown head gasket and dont see signs. Maybe lucky? Who knows. I will have my DH heads soon and will know for sure about the head gasket. Godd luck to all,..
Registered!!
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From: Lake George, New York, US
Rep Power: 0 I did a couple runs @ 10 but I stay safely at 8 all the time w/ no problems.
We have all heard the story though, that it may not seem like high boost is causing problems at first but it may come back to haunt you....
keep us posted though if you do keep it at 10 or 11for a while and if there are no problems b/c I will run out and turn the allen key to up mine!
We have all heard the story though, that it may not seem like high boost is causing problems at first but it may come back to haunt you....
keep us posted though if you do keep it at 10 or 11for a while and if there are no problems b/c I will run out and turn the allen key to up mine!
Registered!!
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From: Bel Air, Maryland, US
Rep Power: 0 I ran 10 lbs daily w/ no alcy and no additional injectors(using stock) and 93 octane. no probs whatsoever...it's been tuned a lil by a shop but other than that it's the same as when i installed it over the summer...just sold it tho...looking to put new injectors in, but could never find the right ones
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From: Atlanta
Rep Power: 0 Answer me this...When i had my boost turned up to 6-7, at wot i can feel the car studder, and i hear like this ticking sound through my boost gauge. IS THIS DETONATION? It only did this when i would try and run it hard like in a race or something. I have since turned the boost down and I don't have this problem anymore, but i want to go faster damnit 
Registered!!
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From: Bel Air, Maryland, US
Rep Power: 0 The "stuttering" you're probably feeling is just the boost controller doing it's job...that will happen anytime you go wot and let boost get to whatever level you're controller is set at and then some...as for the ticking through you're boost guage...get a new boost guage.or check the wiring.and oh, you can go fast man, trust me
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From: Atlanta
Rep Power: 0 I don't have my boost controller hooked up yet and it only will do it when i adust the boost to go around 7. As for my boost gauge...same thing only above 6 and it is brand new, I don't see how any wiring could be loose... the only wires there are for the light. The rest is just a straight line to the T fitting.
Skyline R33
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From: Houston, TX
Rep Power: 0 You can tunr boost up by placing a T fitting on the hose going to your wastegate. Leave the end of the hose open and it will be like an open bleeder valve. Make sure it is a small T with small opening. This is what I do to get to 10psi. It works and no problems.
Dont put two T's in this is where I spiked to 14psi. I thought I blew my water jackets out, but now I am not sure. Will know soon when I pull my heads.
Dont put two T's in this is where I spiked to 14psi. I thought I blew my water jackets out, but now I am not sure. Will know soon when I pull my heads.
Proud Srt4 owner
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From: Spangdalhem AFB, Germany
Rep Power: 0 yes i am one of the members madwheel is talking about that has alcohol injection but i rarely use it. I have ran 9-10psi without it many times but I also have a s-afc to add in the extra fuel if needed.
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