Seven

Hey all,
I've read and searched a bit and honestly one of the things I was surprised NOT to see in the faq (it might have been there and I overlooked it) is one of the most important things IMHO is what the stock motor will support on boost.
So what whp are you guys breaking stuff at approx?
Or is no one breaking anything yet?

kikcaffine

depends on tune.

draxcaliber

approximate 300 whp with proper installation and tune.

lots of daily driven tc's make this much power running about 10 psi.

Seven

The person I intend to tune this car is well known. His name is Jeff Evans if you've heard of him.
However ... let's assume the tune is very good.

Seven

This is what I was looking for.

What exactly is usually the weak point above 300whp?
pistons ? rods? etc

draxcaliber

probably the rods. there was this puerto rican scion making 356 whp on a stock engine, and later, when they were doing some other work on it, they noticed the rods had actually all started bending. didn't break, or lose compressions, but literally the connecting rods had curves.

and i think about 350 whp to 400 whp, you need to build up the half shafts.

Seven

bending the rods... wow.
I wonder if the cylinder walls got scored, I'd think they would have.
Basically I'm planning on trading my Trailblazer in on a tC and I figure if it ever isn't fast enough for a DD (I have a 240SX with an LS1 as the power plant) I'll turbo it, just wanted to know what was safe.

shadow12one

300 whp and 10 psi is a good amount for a stock block DD tC. I think the 250-300 range would be good and safe enough.

t_urbo_C_harged

Yes depends on the tune... I have seen numbers as high as 330whp on 10psi... same pressure, just better tune. I think 350 would be the max safe point, but I wouldn't run it there all the time. Besides the rods giving, the piston rings a also pretty thin so that might cause an issue as well although I haven't heard of any reports of something happening because of their rings yet...

Guru

About 350-360 WHP on pump gas everyday are more than reliable (standalone required). On race gas I have pulled over 425 WHP and run about 14-16 PSI at the track using special VP rave fuel but keep in mind that is only for 12-13 seconds at a time. I do not recommend you do that often.

KingsleyinMD

i have a rebuilt engine with a greddy turbo kit. but i mistakenly got an automatic. wat wud b a safe psi setting or how much power cud i run safely with a rebuilt engine and an automatic

draxcaliber

well, the engine is the same for both manual and automatics, but the automatic transmission can only handle about 250 whp/torque before it starts slipping, so you would have to do a valve body upgrade to handle more power.

draxcaliber

oh man, that 240 sx sounds awesome, i watched an episode of pinks where an ls1 powered 240 sx just pwned a supercharged 5.0 liter mustang all night long!, i think they were from pennsylvannia too...

KingsleyinMD

TurboToyotas

Seven-

Your in good hands with Mr. Evans, the next time you talk to him tell him Todd from AZ said hello.

The stock motors can take allot, 350+ on a piggy back is not a problem for a daily driver

Have fun and good luck

Regards-

Todd

paul_dezod

I do not entirely agree with the piggybacks being able to reliably hold the power over 325whp due to the mere inconsistancies of them. The tuning is undoubtedly the most essential part of the reliability, and if you elect a standalone ems and the tuning is dialed in conservative, you can make around 350whp reliably, but IMHO that is the beginning of the brink of destruction.

Aznxguy4life

jeff evens is a good guy to go to to get you car tuned now you have to look at clutch and boost controller. you can control ur boost so if can hit 350 at times and normal drive at 250 or so depends on how you tune you car. and later on you would want to look into the lsd too

rhythmnsmoke

I would say around 350 is the stretching point. Some have ran 400+whp on the stock motor, but that number + racing it does not last long.

Seven

It's a cool car... needs some odd and ends yet, mainly paint/bodywork and some new shoes/rollers. I have an S14 chassis tho... newer bodystyle.

He's the man. Nice guy, does awesome work and isn't crazy spendy. Not to mention he's about 20 mins away. I know enough about tuning that I could manage it myself (I will/have tuned the LS1), however for my DD I'd like it to be watched by him a little more closely.





It looks like I'm gonna pick up a 2008 tC 5 speed base model in black sand tomorrow afternoon. As long as they give me what I want for my Trailblazer. So I'll let you guys know.
Thanks

guitarguru44

So, I guess the question is anyone under 300 whp have any problems. After that it seems there are differences in opinions but anyone see any other upgrades needed for the 250 whp range other than a clutch?