This is the setup i have being built by a shop. I need to know if 28psi is too much for my turbo and motor on pump gas. this is not a strip/track car. kinda a daily driver. Ive read people making more HP than this on pump gas. my first attempt at this i did not have a sleeved block. im looking for some re-assurance the reason my first block blew was because of catastrophic failure (#4 cylinder cracked sleeve) and it most likely wont happen again with sleeves.

at 22psi i yielded 350whp. 28psi should be 400+~whp

b16a2- darton open deck sleeves .020 over, eagle and cp setup, 9.0:1, Brian crower stg 2 turbo cams, titanium retainers, valve springs, fluidamper, FAL fan, mishimoto radiator, hasport solid mounts, D2 coilovers

obd1 tuned on ectune w/ electronic boost solenoid w/ boost by gear option
68mm throttle body, skunk2 intake manifold.

turbonetics t3/t04b .48 a/r 50trim. cast log manifold, 38mm turbonetics evolution wastegate

i know the simplest answer is to get a bigger turbo. probably a 60trim. but this is my current setup and ive spent ALOT of money getting this done.

any info/tips/advice would be appreciated.

 

bump for info?

 

Another turbo, retune. Sorry to say that, but in your case, it is that simple. the older turbonetics used stage 2 turbine wheels. That's why its taking so much boost to get that power.

 

did i read it correctly? you were running 28psi on pump gas?

if so thats the reason right there

 

yea get a new turbo even just a new t3/t4 57 trim .63 a/r will get you where you want to be...i run one on my stock b16a at 11psi i made 320 at the wheels tuned by matt shue

 

this is a legit question.

i thought it depended on how much power the engine made that decided weather or not i needed race gas. there is another guy that had same motor built. almost exact spec's except on a 60trim yielded 432whp on pump gas.

20 psi on a 50 trim is different that 20 psi on a 60 trim. so why would it matter if i ran 28psi on my turbo if it got me to the same HP goal?

just wondering where cfm comes in

 

Two words...turbo efficiency.

420 is a little much to be asking of a 50 trim, power AND pressure wise.

 

^ agreed remember those words right there...turbo efficiency!!!

 

As stated, in a nut shell, your turbo is too small.

 

Small turbo+turbo out of its efficiency range = hot air into motor

hot air into motor = high combustion temps + lean fuel mixture

lean mix+high temp = boom

So yea, get a bigger turbo.

 

i checked out turbonetics site, it says that this turbo is good to 325-425 HP. if i was getting close to that level i should just turn boost down so im operating out of the turbo efficiency. i need to check the compressor maps ...

 

Thats a big gap, the 425 is probably with a stage 5 turbine wheel and .82 turbine housing and still the compressor would be out of its efficiency range, as stated above you probably have a stage 2 turbine wheel and no its not worth it to upgrade just buy a bigger turbo.

 

With sleeves why did you just go .020 over? why not go 82 or 83mm?

 

because at first did not sleeve the block. bought pistons for 81.5mm (wasn't gonna sleeve) then the block went boom.


from what i can see on the compressor maps, im gonna need to turn down the boost for now, till im able to get a bigger turbo. this turbo for the stage 2 wheel is rated from 325-345. so thats where ill
stay at for now.

 

Also mind that horsepower ratings are flywheel, never wheel.