Many of you asked about turbocharging the 60 deg V6: 2.8, 3.1, 3.4. The basic design of these engines are similiar, except that the engines built for the front drive cars have canted valves and breathe better.

Anyway, I spent the whole afternoon last Saturday at a dyno shop watching my son's buddy, Joe,try to blow upthe 2.8 in hisPontiac GP.At first they had problems getting a tach signal to go past 3000 RPM, so the first pull showed 250 HP @ 3000 RPM & 14 PSI, and had to stop because the dyno has to know the RPM. Finally got everything working, the PCM was adjusted to call for 16 PSI but the turbo would only deliver 14 PSI, timing was advanced a few degrees and the little engine made 272 HP @ 6500 RPM at the front wheels. Pretti good for a ~170 Cu inch engine.

Sad part. After me and my son went home, and weresucking on some cold ones,we get a call fromJoethat coolant is leaking around a head bolt, we thinking a blown gasket or cracked head. We tell him to go easy until he figures out what is really going on. Apparently he was having too much fun playng with the car. Later that evening another call, the car is knocking badly and running bad. Joe said he was going to check the bearings. He calls backSunday saying that the inside of the oil pan looks like the floor on a machine shop with piles of metal shavings.

Moral, you can make a lot of power with forced induction, but you need an engine that can take the abuse. Had the bottom end been properly reinforced, the engine may have lasted more than a few hours.

 

Do you think 5-6 psi would be safe on a RWD 2.8?

 

That should be the max on a otherwise stock engine for street use. Any more than that the engine has to be built like an all out race engine with the best components, proper machining and assembly. Double the power on a stock engine without doing all the necessary preparation is asking for trouble.

 

my buddy has a 3.1 cavaler z24 with a t4 turbo on it @7psi on the stock internals hes had that setup for abou a year and its never gave him any prob makint about 250hp to the front wheels

 

ya you CAN run in upwards of 10psi on anyNA engine prity much.. but if you go past that like 16 for exsample your asking for it. the tranny is going to take a hell of a beating to. im going to rebuild my 350 and stroke it to a 383 and slap a TT kit and run about 10 psi. the engine was rebuild years back with realy good parts so i might be able to run more then that but in a v8 its not nessisery.

 

This is not true. [>:]

 

Well if you are goin to run more then 10psi of boost on your engine you should build it with a forged bottom end.

 

you can run more than 7psi on a stock bottom end, but the tune has to be friggen perfect, or else the pistons are gonna look like tin foil in the crankcase

 

Lowering compression helps a bit too...I'm just saying. haha