06 Monte Carlo Turbo Build

[bearbear3_4]

I've decided to stick with 8-10 psi but to change to a smaller a/r hot side so it spools faster and gives me boost sooner in the rpms. If my trans doesnt take a dump I'd be disappointed, means I'm not pushing it hard enough.

[TGP37]

Yeah but you live in the "burgh". The whole town is surrounded by hills.

And I now have a 5 speed. Ceramic brakes are a must up here.

[unchained01]

Yeah but you live in the "burgh". The whole town is surrounded by hills.

[TGP37]

Just got to watch the combustion temps and thermal expansion of the top ring. If the top ring gets too much heat and butts, kerpow, piston ruined.

I would make the AFR to be more on the richer side if going past 6-8 psi on stock bottom.

I believe in building an engine to run X amount of boost, then actually use half that for longevity and reliability. If your engine can handle 16psi, 8psi is a great limit. No reason to risk all that hard work for more power when your already are pushing 50% more total output.

But if you did run 15psi and the trans takes a dump, would you regret it? I know I would, cause that is what screwed up my 4t60e. It never drove the same after 12-15 psi WOT up hill.

[bearbear3_4]

Well 12-15psi is a lot for the 3900 I think. Running 8 makes it scream. 15 would be just for track and the trans is already on borrowed time as it is lol.

[pocket-rocket]

I'm toying with the idea of raising the boost to 15psi. Turbo, injectors, fuel pump, and intercooler all will support I have a feeling the internals will not. Has anyone ever put that much into the 3900?

I would be more worried about the trans, though sustained 12-15 psi seems to be the most you want to run on other bone stock 60v6s from what I've seen on the forums.

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[bearbear3_4]

I'm toying with the idea of raising the boost to 15psi. Turbo, injectors, fuel pump, and intercooler all will support I have a feeling the internals will not. Has anyone ever put that much into the 3900?

[bearbear3_4]

Lol

[TGP37]

Funny cause I did the opposite. I had my IC where yours is now, then I blew the seals on my old turbo...replaced it and re did the whole setup. Now my IC sits just behind the rad, below the dogbones, just above the rad fan motors.

lol

[bearbear3_4]

I toyed with that idea about putting the intercooler where you had it but I ended up blowing the seals on the turbo so I upgraded to a T70 and redid the whole setup. The intercooler now sits in the bumper behind the drivers fog light. I also finally have it tuned and running 8 psi. Best 1/4 so far is 13.7 at 103mph on street tires.

[TGP37]

Dumping the 4t60e and swapping in a getrag 282 provided lots of extra space to use. I also put the intercooler just below the dog bones and it rests up against the rad fans. I was at first worried the rad heat would make hot IAT's but no, they stay cool. Well under 120*F with 8-9 psi boost.

[bearbear3_4]

I tried to keep everything in the engine bay but it's getting way to hot. Also the turbo I have is too small and it's getting over worked. I'm going to rip it all down and start over. Was thinking of seeing about replacing the cam and upgrading to studs. Ideas?

[bearbear3_4]

I have a shift kit in it, but it felt nothing like changing the pressure and time. SO much better.

For normal day to day driving I run premium and E85 only at the track. I have tunes for both. Still running the stock fuel lines. Might just have to upgrade the lines while I'm at it lol.

I'm surprised I haven't updated the thread.

Been running the new pump and injectors for a while now. Everything works great but still doing the fine tuning.

[bearbear3_4]

cool man, I was impressed with how raising the ATF pressure made my 4t60e pull harder and shifts had more grab-n-go.

New injectors and a better pump, yeah, that'll do it all right. A cap full of top-end cleaner per tank full of gas does well to counter act the dry ethanol in the fuel. And will help keep the new fueling system clean for years to come. i think BP already adds something similar to their fuel.

Do you have stock fuel lines still? I had to upgrade to a larger line, had very slight pressure loss at the top-end/high rpm range in boost. Putting in a 3/8" ID really helped that a lot.

My fuel pressure jumped from 45 ish psi to 65psi at idle after the line swap.

I have a shift kit in it, but it felt nothing like changing the pressure and time. SO much better.

For normal day to day driving I run premium and E85 only at the track. I have tunes for both. Still running the stock fuel lines. Might just have to upgrade the lines while I'm at it lol.

[TGP37]

cool man, I was impressed with how raising the ATF pressure made my 4t60e pull harder and shifts had more grab-n-go.

New injectors and a better pump, yeah, that'll do it all right. A cap full of top-end cleaner per tank full of gas does well to counter act the dry ethanol in the fuel. And will help keep the new fueling system clean for years to come. i think BP already adds something similar to their fuel.

Do you have stock fuel lines still? I had to upgrade to a larger line, had very slight pressure loss at the top-end/high rpm range in boost. Putting in a 3/8" ID really helped that a lot.

My fuel pressure jumped from 45 ish psi to 65psi at idle after the line swap.