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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 02-19-2009, 04:12 PM   #61
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Originally Posted by patsmx5 View Post
Probably no surge at 7 PSI. But 28....
I really dont think i'm going to have to run 28psi to get the power that I want. Jennifer Tipton did it with a t3/t4 on 18psi. With WI and loads of timing, i shouldnt need big boost.
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Old 02-19-2009, 04:27 PM   #62
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I really dont think i'm going to have to run 28psi to get the power that I want. Jennifer Tipton did it with a t3/t4 on 18psi. With WI and loads of timing, i shouldnt need big boost.
It all depends. For example, Paul made 300whp at 14 PSI on a GT2560. Impressive. But did like 310whp at 17 PSI. Not too impressive. Had he went to 20 PSI, might have seen 325whp. 28 PSI, 360whp? Who knows, but basically 14 is the sweet spot for his setup and turbo. I wouldn't assume just because someone else with a bigger turbo did 400whp with 18 means you can with a smaller turbo.

A good size T3 will do the job. A T3/T4 would too, but it won't spool as well. But for small engine/big turbo engines, that's good for keeping them from surging. But not desirable from a streetability point of view. I guess I need to do more research on whatever turbo y8s is using, but my GT3271 spools to 7 PSI over 1k RPM's sooner than his, with a MBC..... And I thought mine was basically the same thing with a bigger turbine, which means it should spool later, not sooner.
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Old 02-19-2009, 04:36 PM   #63
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Originally Posted by patsmx5 View Post
It all depends. For example, Paul made 300whp at 14 PSI on a GT2560. Impressive. But did like 310whp at 17 PSI. Not too impressive. Had he went to 20 PSI, might have seen 325whp. 28 PSI, 360whp? Who knows, but basically 14 is the sweet spot for his setup and turbo. I wouldn't assume just because someone else with a bigger turbo did 400whp with 18 means you can with a smaller turbo.

A good size T3 will do the job. A T3/T4 would too, but it won't spool as well. But for small engine/big turbo engines, that's good for keeping them from surging. But not desirable from a streetability point of view. I guess I need to do more research on whatever turbo y8s is using, but my GT3271 spools to 7 PSI over 1k RPM's sooner than his, with a MBC..... And I thought mine was basically the same thing with a bigger turbine, which means it should spool later, not sooner.
I realize that i may not be able to do it on 18psi. However, 28 seems high. Maybe i should find out which turbo it was and get that exact one.
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Old 02-19-2009, 04:38 PM   #64
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Looks like my GT3271 has a smaller compressor but a larger turbine compared to a GT2876R. For y8s low boost, he doesn't need that big of a compressor. Big comp + small turbine = laggy. Mine's the opposite basically. A compressor that's not that big but a big turbine. Mine will make more HP per PSI than his, but his has the potential to make more peak power if he runs it up to 28 PSI or so, where mine is done after 23 PSI and ~350whp, his could do 400whp it seems. Still surprised mine spools as well as it does considering the turbine is kinda big. I guess it helps not having an oversize compressor for my goals.
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Old 02-20-2009, 12:57 AM   #65
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yes the more agressive timing and overall denser charge will help u alot man.
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Old 02-20-2009, 01:07 AM   #66
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yes the more agressive timing and overall denser charge will help u alot man.
Yeah, the WI kit will probably be the next thing i get. I am wanting to turn the boost up on my disco potato.
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Old 02-20-2009, 12:43 PM   #67
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Try ethanol for the big octane needs, very popular in honda and evo forums.
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Old 02-20-2009, 12:46 PM   #68
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Try ethanol for the big octane needs, very popular in honda and evo forums.
Yeah, i've considered that. Unfortunately, however, we do not have e85 around here.
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