hey pple
i just need sum advice...i got 2000 prelude (base) i recently put turbo in it and running it only at 8psi..everything is stock i wana know wut mods i'll need if i wana UP the boost..wats the maximum boost i can run on stock engine

 

I'd stay at that PSI on a stock motor. You should post this in F/I...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by malangi &raquo;</TD></TR><TR><TD CLASS="quote">hey pple
i just need sum advice...i got 2000 prelude (base) i recently put turbo in it and running it only at 8psi..everything is stock i wana know wut mods i'll need if i wana UP the boost..wats the maximum boost i can run on stock engine </TD></TR></TABLE>

Read the FAQs and learn how engines work first....you can barely type English.

 

if stock turbo is what U wanted, then your current setup is good. Is the motor JDM or USDM????

JDM (10:6:1) maximun safe boost is 8psi, but 9 can be done with only minimal runs.
USDM (10:1) has a slight lower compression, I don't have this setup but I have a friend who ran 9 PSI and 10 psi max.


I have heard that you can put in a thicker headgasket to lower the compression for 10psi. haven't done it myself so I can't really say.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mongtite &raquo;</TD></TR><TR><TD CLASS="quote">if stock turbo is what U wanted, then your current setup is good. Is the motor JDM or USDM????

JDM (10:6:1) maximun safe boost is 8psi, but 9 can be done with only minimal runs.
USDM (10:1) has a slight lower compression, I don't have this setup but I have a friend who ran 9 PSI and 10 psi max.


I have heard that you can put in a thicker headgasket to lower the compression for 10psi. haven't done it myself so I can't really say.
</TD></TR></TABLE>

you mean with a tune right? without a tune i wouldn't boost 10psi.

to the OP: i would just buy a tunable ECU. hondata, neptune, AEM just to name a few.

 

To the OP: I suggest you listen to Hawkze. I hope you have invested in a good tune and are not driving around with a grenade without a pin under your hood; if not please do yourself a favor and work on getting it tuned safely before driving it much more.


In general: I hate to jump in and steer the conversation, but psi is an overgeneralization thrown around without much regard to the turbocharger causing the pressure. The limit factor for an engine should be related to its hp or tq production, not a "magic" pressure after which the engine summarily self-destructs.

The .6 higher compression found in the h22a vs the usdm h22a1/4 creates issues mainly in the use pump gas at higher hp levels, and a narrower margin for error in the tune. With a good all around turbo package (read: good tuner, efficient turbo, sufficient intercooling, low backpressure exhaust tract, and high octane fuel) there is no reason a stock block h22a cannot see 10+psi and last. Essentially psi is irrelevant...a stock h22a is capable of 300whp on pump, 400+ on race fuel.


A decent read if you are so inclined:
http://forums.evans-tuning.com...=1261

 

don't always believe you people say until U do have done it yourself but be aware of what they say. Just fine someone that tune it good.

YEa, I have issue with Street_Accord94 but as he mentioned, PSi is not the same output for every turbo, its just a number.

 

I have a turbo on aswell but I disagree with those that say you can run 8-10 psi on the stock block. I bet you could get away with it for awhile but the rings lands will brack at sometime. Now this is just me I run 7psi MAX and thats on limited runs. This is because I want the motor to last til I get enough money to get my built block. If you don't have the money for a built block I would becareful cause your motor could fail on you and your out of a car.

 

ok i was also thinking on boostin my stock motor! wit a 7psi tuned! is that safe? also should i change my head gasket wen i put the turbo on? do you guys think it really matters how many miles the motor has?

any suggestions are welcomed

 

I've been lurking around this site for a while, and am waiting to buy a Prelude (have options, need to get loose ends tied up first), and can help a bit. Psi is completely different from turbo to turbo. You can only tune any car to a point, psi is a pointless thing to go by. 10 psi on a t-25 flows a small amount of air. 10 psi on a GT4096r flows a hell of a lot more, lol. See the difference? Your tuner is looking at not just air/fuel ratio, but also knock count, and will probably shoot for a 0 knock tune in a daily driver. Of course this would be with 93 octane pump gas. Knock, air/fuel, these are the types of things that determine how much air you can safely push into the engine. This doesn't mean you can just turn up the boost deep into or past the turbo's efficiency and assume you can just add more fuel and it'll be fine. Eventually you get to a point where you need more octane (hence c16, which is 116 octane race gas). Also, timing is important as well. Some people like to turn up the boost but have to pull timing to compensate for knock, and in effect gain no horsepower, consume more fuel, and lose torque. I hope this helps, because asking "what psi can i run?" is such an open-ended question. Compression ratio, knock, air/fuel, are what determine how much air and fuel you can safely run (assuming a good fuel/timing management system and capable fuel supply) determines end horsepower. PSI numbers are the least important, because the most in-depth and knowledgable tuners focus on pounds airflow per minute. I'm sorry, I'm rambling. Hate to suggest hitting another forum, but go read and search around dsmtuners.com Absolutely the most knowledgable site I have ever come across when concerning forced induction, or anything for that matter, and a lot of the guys on there are engineers and whatnot.