Custom Turbo Kit Ingredients
BOOST JUNKY
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From: Wide Open Throttle
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^^ I think that's the only thing I don't like about it. I guess HKS figured it didn't really matter since it was for the measly d series....or maybe they just did it in a hurry cuz they wanted to be the first out w/a product for the d series who knows. Point is...I was having a conversation w/my b/f the other day and he mentioned how he had read about test where they took a gsr (turbo obviously) and designed two manifolds. One log, and one tubular...they even made it so the turbo/downpipe would sit in the same positions on both the manifolds, to correct for any possible errors. Final word? Tubular manifold made about 43WHP MORE than the log style.
I'm convinced they [log manifolds] can hinder performance, and have always known that they aren't "as good" as tubular or equal length manifolds, but never to this extent and I wonder if it would make such a difference on the D17. Does anyone know of anyone on the boards using a log manifold that has dyno #'s to use for comparison against some1 with a tubular/equal length manifold??? It would be nice to compare, at least people using the same size turbo's.
I'm convinced they [log manifolds] can hinder performance, and have always known that they aren't "as good" as tubular or equal length manifolds, but never to this extent and I wonder if it would make such a difference on the D17. Does anyone know of anyone on the boards using a log manifold that has dyno #'s to use for comparison against some1 with a tubular/equal length manifold??? It would be nice to compare, at least people using the same size turbo's.
Last edited by SpdRcrChk; Jul 19, 2004 at 12:01 PM.
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well, everyone with an SF kit has a tubular/equal length manifold and c2i0v0i1c has one too, and im sure you could easily find someone with the hks one.
BOOST JUNKY
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From: Wide Open Throttle
Rep Power: 0 Yeah the problem is finding someone (or 2) willing to show dyno numbers....and two people that have the same size turbo. Anyway...it doesn't really matter. Chances are, the tubular/equal length is prolly gonna make more power (however little that may be LoL).
i doubt it's gonna make a huge differance in numbers on our SOHC's. how much was the overall HP on the gsr in the test. was it big numbers or small boost?(sucks cause i got a hks manifold. but for 150 for the new mani and downpipe. can't go wrong)
BOOST JUNKY
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From: Wide Open Throttle
Rep Power: 0 I'd have to ask about the overall HP on the gsr. Sorry, dunno that offhand. I'm pretty sure the difference wouldn't be AS much on our cars either. Just was curious about it. I haven't seen too many people w/t28's or t25's on the tubular manifolds though, so it's kinda hard to do a direct comparison with the accuracy that those people did. There would be too many differences, now that i think about it. Best way would be to take 1 car and do the same thing they did. Anywhoooo...no biggie.
yah I think there is forshure a difference, but it might not be huge on our motors. Im hoping it doesnt put a choke hold on my set-up, because all the tubular manifolds for our cars use an external wastegate....cept for sf 
At least I cant find one. I guess I could just use a block off plate, but i bet that would disrupt flow just as much as a log manifold! Im hoping to make around 175WHP on 7-8 psi on a DX, so we shal see. If the numbers dissapoint me then maybe i will look into getting a custom manifold built.
spdrcr: what is you're set-up now, or what do you plan on having?
At least I cant find one. I guess I could just use a block off plate, but i bet that would disrupt flow just as much as a log manifold! Im hoping to make around 175WHP on 7-8 psi on a DX, so we shal see. If the numbers dissapoint me then maybe i will look into getting a custom manifold built.spdrcr: what is you're set-up now, or what do you plan on having?
Registered!!
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From: Zulu Alpha Tango Foxtrot
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Originally Posted by SpdRcrChk
^^ I think that's the only thing I don't like about it. I guess HKS figured it didn't really matter since it was for the measly d series....or maybe they just did it in a hurry cuz they wanted to be the first out w/a product for the d series who knows. Point is...I was having a conversation w/my b/f the other day and he mentioned how he had read about test where they took a gsr (turbo obviously) and designed two manifolds. One log, and one tubular...they even made it so the turbo/downpipe would sit in the same positions on both the manifolds, to correct for any possible errors. Final word? Tubular manifold made about 43WHP MORE than the log style.
I'm convinced they [log manifolds] can hinder performance, and have always known that they aren't "as good" as tubular or equal length manifolds, but never to this extent and I wonder if it would make such a difference on the D17. Does anyone know of anyone on the boards using a log manifold that has dyno #'s to use for comparison against some1 with a tubular/equal length manifold??? It would be nice to compare, at least people using the same size turbo's.
I'm convinced they [log manifolds] can hinder performance, and have always known that they aren't "as good" as tubular or equal length manifolds, but never to this extent and I wonder if it would make such a difference on the D17. Does anyone know of anyone on the boards using a log manifold that has dyno #'s to use for comparison against some1 with a tubular/equal length manifold??? It would be nice to compare, at least people using the same size turbo's.
Here it is:
http://www.honda-tech.com/zerothread?id=925312
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From: Dallas, PA
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Originally Posted by opto_isolator
Yeah, it was on the Honda-tech forums, and I believe it was Full-Race (AWESOME manifolds - makes SF's look like playskool pieces).
yeah, and for over $1,000.....u get what you pay for
anyone in here make their own IC piping? i don;t know anywhere with a madrel pipe bender but my freind is a master welder. i was thrying to find out how many and what angle pipe bends did you guys use? and how many couplings.
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From: Hickville, NC
Rep Power: 0 ^^I did...i used Jegs 2 1/4" aluminized steel U bends, I ordered 7 but only used 5 all together with some small scrap pieces. Its like a puzzle, you just have to put the piping up, figure where to cut then weld...my first try i was a little short on the charge pipe but i just corrected it and then welded it all together. It took about 4 hours just for that but i figure it was worth it...i learned a lot and i can say i do have "custom" piping. And i used 6 couplings.
Back to the question about the difference between a log and equal length, i can tell you this...when i had my GT17 and T28 on the HKS manifold it was still fast and made good power(never dynoed with the hks one), but as soon as i got my equal length mani i noticed quicker spool up and more power i dynoed at 188whp @ 8psi. If i still had the HKS manifold id dyno with that one too to see where how it did, the only real complaint was i think with the design, but top end wasnt as linear, i could feel the power top off above 5200rpm, but now it doesnt do it any more.
Back to the question about the difference between a log and equal length, i can tell you this...when i had my GT17 and T28 on the HKS manifold it was still fast and made good power(never dynoed with the hks one), but as soon as i got my equal length mani i noticed quicker spool up and more power i dynoed at 188whp @ 8psi. If i still had the HKS manifold id dyno with that one too to see where how it did, the only real complaint was i think with the design, but top end wasnt as linear, i could feel the power top off above 5200rpm, but now it doesnt do it any more.
hmm good info. So 2 1/4" is the size of CAI piping correct? You think I would be able to cut all the pieces and then go somewhere to get them to weld? I dont have access to a welder, and I have no clue how to weld. What manifold are you using now? Sucks cuz I already bought my HKS. I guess if I want more power I can do other things, then eventually get a new mani for the extra power.
Chicks dig my scent
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From: Hickville, NC
Rep Power: 0 Right its the same size...any reputible welder should be able to do with for cheap and effectively. The manifold i have now is an equal length one from a shop in town, it took damn long to make but it works great, its almost identical to SF's. The HKS manifold isnt that bad, its just you wont get 100% of the power there but more like 90%. For starting out i think its perfect not to mention the $$ you'll save for now. Good luck which ever way you go..and if you do get a custom manifold dont go cheap on it...it'll be worth it in the end
skater:sounds good. I agree that tubular will make a difference, but how much will depend on alot of things. I'm with boosta on the question. We are both doing almost the same charge piping/ic piping set-up, so any help is much appreciated along with pics if you have any!
Chicks dig my scent
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From: Hickville, NC
Rep Power: 0 As far as my piping goes, I used U bends from Jegs, the angles i cut from the U depending on which way i needed to go. In tight spaces (ie: up under where the washer fluid reservior used to be) I used donut bends, i got from a local muffler shop. Im sure Jcwhitney sells them. I'll try and get some pics, i used the charge pipe design very similar to the one that catalyst has on his car.
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