The truth - 8.5 psi too much on LS6?
Thread Starter
Staging Lane
Joined: Jul 2004
Posts: 95
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The truth - 8.5 psi too much on LS6? Gents -
I've searched some but would prefer some qualified opinions. I have an '04 CTS-V with Mag I/C, stock manifolds and exhaust with bolt on RT hi-flow cats. I tune via EFILive.
I just reinstalled the maggie after having some work done to it at magnuson. I placed a 2.6" pulley on at the same time.
Now I build a solid 6 psi from 1500 RPM - 2000 RPM, growing to 7 psi and peaking at about 8.5 psi somewhere around 5000 RPM to redline. This is a seriously fun car now, and I haven't logged any KR in the cool temps of the last few days (50 degrees).
My serious question is whether this is too much for the stock bottom end?
In otherwords, am I going to blow her up? I'm at 4,500 base altitude and am a little worried about what happens when I drop to sea level.
Sorry for being a wimp.
Wildwhl
I've searched some but would prefer some qualified opinions. I have an '04 CTS-V with Mag I/C, stock manifolds and exhaust with bolt on RT hi-flow cats. I tune via EFILive.
I just reinstalled the maggie after having some work done to it at magnuson. I placed a 2.6" pulley on at the same time.
Now I build a solid 6 psi from 1500 RPM - 2000 RPM, growing to 7 psi and peaking at about 8.5 psi somewhere around 5000 RPM to redline. This is a seriously fun car now, and I haven't logged any KR in the cool temps of the last few days (50 degrees).
My serious question is whether this is too much for the stock bottom end?
In otherwords, am I going to blow her up? I'm at 4,500 base altitude and am a little worried about what happens when I drop to sea level.
Sorry for being a wimp.
Wildwhl
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The thing to keep in mind is if you are making 8.5 psi at 4500 feet you will have more boost at a lower altitude. With my original SC my car made 8.5 psi in Tempe (~800 feet) where it was tuned. At home at 7000 feet it made 6.5 psi. The difference between the 7000 feet at home and the drag strip at 4900 feet is .5 psi.
Assuming that the maggie has the headroom I would guess that you would see +1.5 psi between your altitude and sea level.
Assuming that the maggie has the headroom I would guess that you would see +1.5 psi between your altitude and sea level.
Thread Starter
Staging Lane
Joined: Jul 2004
Posts: 95
Likes: 0
Thanks for all the input LSxians.
I'm going to pull a little timing for now, fatten her up a bit, and spend plenty of time logging/tuning to get it all sorted out. If there were a local dyno tuner it could be a lot simpler, but what FUN would that be
I have to admit - the difference between the boost with the 2.8" and 2.6" pulley from SOTP is amazing. Traction control kicking in at the top of 3rd at 9/10's throttle (wet roads today) is pretty darn
I'm going to pull a little timing for now, fatten her up a bit, and spend plenty of time logging/tuning to get it all sorted out. If there were a local dyno tuner it could be a lot simpler, but what FUN would that be
I have to admit - the difference between the boost with the 2.8" and 2.6" pulley from SOTP is amazing. Traction control kicking in at the top of 3rd at 9/10's throttle (wet roads today) is pretty darn
http://www.exoticperformanceplus.com...Car.php?car=33
You could install a wide band air/fuel gauge in the ash tray where we installed a gauge in the V above. It might make it easier to keep an eye on things. Bob
You could install a wide band air/fuel gauge in the ash tray where we installed a gauge in the V above. It might make it easier to keep an eye on things. Bob