I tried to be inventive. Having fun with tags too.

 

Current list of new things:

TSE built shortblock
VVT head, rebuilt by a local shop, with supertech dual heavies.
VICS intake manifold
Skunk2 throttlebody
Fab9 550hp intercooler
TSE 25-row oil cooler
Beatrush undertray (Wonderful for turbos)
FM silicone intake piping
Forge bov
LS3 coils (Setup built by Curly)
Likely lots of other stuff, but the critical stuff is here.

At about 22psi, it pulled close-to 350rwhp (If VICs is allowed, and note on that later, it's 360rwhp).

Interestingly, VICS was worth 12 lb/ft at these power levels. It's not currently enabled due to it going over 6speed power limits however, it was definitely worth a chunk of power after 5500ish rpm. This is notable simply because Pinky's CNC'd manifold (Psuedo-gutted?) resulted in large power losses.

With that said, there's stuff that needs to be done still, and both the turbo and mani badly need machined to be made flat, so there's more still in the tank likely - likely quite a bit more. However, as per Curly, "Take a look at the two graphs, pay close attention to where the boost goes from 18 to basically 22psi, which is 5600-6600ish.

Notice that HP also climbs in that region, but it also starts to level off even while boost continues to climb. And despite holding just over 20psi to redline, we lose 45hp.

That's most likely an indication you're hitting some restriction, requiring possibly head porting, 3.5-4" exhaust, less muffler, etc, etc. "

This should not be out of the efficiency range, as per Precision (according to Precision, the 4828 is safe to take to 35psi in our engines when it's still well within it's efficiency range), but it almost sounds like it. Does anyone have ideas here?

 

Woop.
It probably needs more port flow/valves or cams I guess. Id say the power is to be found in the head.

Dann

 

You need an intake manifold.

 

Ouch. At least that's relatively cheap compared to what I had talked myself into (949 head, 949 cams et al).

Any thoughts on how Soviet could pull 400 on what looks to be a stock IM?

 

A pile of boost, IIRC

 

Huh, I should be able to do that too on this turbo - but I've just about run out of injector as per Curly (~90% duty cycles).

Gonna have to pick up some ID1000s from you later I think.

 

You can hit 400whp on a stock intake manifold all day long as long as you give somewhat allofit. How much allofit? About 26-27 pounds of it on a genuine 3071/3076.

 

Got 13psi more available on tap from the turbo, Rev.

Plenty more to go, but first - injectors!

 

Congrats on the results. I guess this means I will be spending a bunch of time in this build thread prepping for my build. I will have a hard time justifying going with a custom manifold and EFR if this was done with your turbo and a begi cast manifold.

 

BEGi cast mani with an Artech downpipe and exhaust, yep Chiburban.

The 4828's are ridiculously sensitive to post-turbine exhaust as I warned you about. Although I'm now wanting a better turbo manifold like Soviet's for spool/power, plus a better intake manifold.

 

I forget... What a/r? .86 or .63?

And any idea why it takes you so long to get to 20psi? It seems like you plateau for a bit and then rise again.

 

Why do the ports with a valve on the end of them flow better than the inlet manifold runners?

What am I misunderstanding?

Dann

 

.62 - remember, both the manifold and turbo need the flanges flattened, plus some other stuff is hurting spool I believe.

 

We tried 100% closed EBC all the way to 3250, but boost hit too hard and Jared wanted the torque under 280.

So it's 100% to 2500, then there's a column of 80% at 3250.

 

Holy crap, seriously?

So, even with the questionable mating surfaces and all that, it managed to pull that off? Seriously?

 

Iron log exhaust manifold would be where I would look for a restriction. There is much more volume coming out of the head than going into it and a log doesn't do it any favors for providing direction to the flow.

 

You guys really need to stop trying to make me cut a check to Abe here.

I'll talk to him on his suggestions then...

 

Hmm, thinking about it, yeah that'd be my first guess too for restriction. Drive it first Jared, it's still a blast :O

 

That's what I wanted to comment on - looks like you're making great power and torque and very decent spool, why not enjoy it for a bit and figure out if you actually even need more....

Congrats btw, I'm sure the car is a hoot.

After that, I'd probably look into a tubular mani and proper IM before even touching the engine. Or just crank up the boost and likely pick up a buttload of torque that will make the car feel like a time machine.