[enkeivette]

Originally Posted by 94cobra69ss396

According to my tuner Steve, who has measured outlet temps on setups like my Cobra that don't have an intercooler, the outlet temps range between 250 and 300 degrees at the 11-12psi my engine sees. Notice in the tests that without an intercooler the outlet temp was 199.2 degrees at 8.2psi and they had the timing pulled back to 22 degrees. With an intercooler the temp was only 120 with the same 8.2psi and they were able to run 30 degrees. By increasing the psi to 11.5 the outlet temp rose just under 20 degrees or roughly 14% with an intercooler. See where I'm going with this? Do you still think you can run 26 degrees with 13psi, no intercooler and 91? Remember, this was testing on a dyno, not a car that is sitting in traffic and then being gunned to get on the freeway.

Also, notice in the tests that it took 58hp to turn the P600B at 8.2psi measured at the manifold and 74hp on the same blower to make 11.5psi. That's roughly 21%. Assuming it would take that same 21% to make another 2 psi the blower would be consuming about 90hp.

Wow, considering all that loss I might even be under 500 whp. But since I put down 432 with less than half the boost and a bunch of stuff wrong... prob not. Too much math, need a dyno.

I really would like to intercool it before I run it, but if I keep waiting for one more thing I'll never get it done. I need to find a long thin intercooler with a 3" in and out to mount way up front where my frame extension used to be. I also need a metal saw to cut pipe. I burned my saw up trying to cut some 1/4 thick steel. I miss it dearly.

[enkeivette]

Brutal, I never would have suspected.

[enkeivette]

Btw, according to ATI I can run 34 degrees at 12lbs? with 91 octane, hot air, using Al heads. More like 19lbs intercooled.

My belt driven turbo is self contained so it stays cooler than most, I believe.

[BRUTAL64]

Originally Posted by enkeivette

Brutal, I never would have suspected.

Suspect what??? I have not done anything wrong at anytime.

[big_G]

I really would like to intercool it before I run it, but if I keep waiting for one more thing I'll never get it done. I need to find a long thin intercooler with a 3" in and out to mount way up front where my frame extension used to be. I also need a metal saw to cut pipe. I burned my saw up trying to cut some 1/4 thick steel. I miss it dearly.

I've been away from the forums for a while...and I see you still have not added an intecooler?...ha ha. Yesterday I changed the cam in my bad boy for the 4th (hopefully last) time. This grind is 244/248/114/.617/.609. Comp Cams guarantees it will put me over the elusive 600RWHP level. I am stuck presently at 555, with a small 230/236 cam. Buy a cheap $89 chop saw at Harbor Freight and get that damned intercooler in there!. Then dyno time.

[enkeivette]

I've got a 239/245 right now. Plenty lopey for the street. I do intend to rig up an intercooler after I finish fiberglassing the interior. Problem is I don't have a one piece front end like some spolied C3 owners I know and I need to mount it up behind the front bumper where my frame extension used to be. I need one that it about 9" -12" tall by up to 30" wide with 3" inlets. The inlets are the major problem.

Btw, how many degrees of timing are you running?!

[big_G]

Originally Posted by enkeivette

I've got a 239/245 right now. Plenty lopey for the street. I do intend to rig up an intercooler after I finish fiberglassing the interior. Problem is I don't have a one piece front end like some spolied C3 owners I know and I need to mount it up behind the front bumper where my frame extension used to be. I need one that it about 9" -12" tall by up to 30" wide with 3" inlets. The inlets are the major problem.

Btw, how many degrees of timing are you running?!

Actually, the one piece front end makes the intercooler fitment worse, as I have tilt hinge pivot/clearances to worry about. Trust me, you have it easier. Your cam is plenty big..what is the lobe separation?...As far as timing, it is programmed by the efi...max at light cruise at about 50*, then down to 28-30* from 5,500 to 6,800 rpm. My FAST efi let's me do all kinds of things!

[big_G]

Originally Posted by 94cobra69ss396

Also, notice in the tests that it took 58hp to turn the P600B at 8.2psi measured at the manifold and 74hp on the same blower to make 11.5psi. That's roughly 21%. Assuming it would take that same 21% to make another 2 psi the blower would be consuming about 90hp.

How is the S/C parasitic loss measured?. I know it's a lot, as around 15 lbs. boost my 12 rib belt starts to slip a little.

[enkeivette]

Originally Posted by big_G

How is the S/C parasitic loss measured?. I know it's a lot, as around 15 lbs. boost my 12 rib belt starts to slip a little.

With a dyno I'm not going to talk anymore till I get the car strapped down. She'll speak for herself.

The hood opens up less than 3" from the front of the radiator, so there is no way for me to fit an intercooler there. Unless it's short. I'd rather have it up front anyways, away from the heat.

[Vettezuki]

Hey look, there's a pool on how much you're going to put down.

http://motorgen.com/forum/showthread.php?t=12256