whose running 317 heads with their boosted application?
Le Mans Master
Joined: Dec 2007
Posts: 8,375
Likes: 97
From: Somewhere in the Mid 9's TX
I know I lost mph when I had valve train issues. I upped the power in my stock C6 with an S trim by adding exhaust and an LS9 cam. I went from trapping 136ish at 600rwhp in the 1/4 to 132-133. There were no signs anything was off, I chalked it up to my driving. The next day, I roasted a Porsche with 700rwhp 3 out of 3 times. Started to yank on him in 4th gear. Again, no signs. No noise from the top end, no smoke, nothing. That Friday night I ran the car at the track. That Saturday I street raced the Porsche. That Sunday, as I was pulling up to my wife's aunt's house for Easter at 20mph in 2nd gear to be quiet, the motor came apart.
Cam bolts had backed out, took out lifters, and whatever else. A vendor here didn't lock the cam bolts down. No boost, just 1500rpm cruising.
In hindsight, the street doesn't mean anything. If you consistently use a certain dyno, that and the track combined should be what you go off of.
Even at 9.1:1, I'd be looking at tearing in to it. I'd burn down a Vette that trapped 94mph in the 1/8 with an F1r. That's what NA bolt on vettes trap.
Cam bolts had backed out, took out lifters, and whatever else. A vendor here didn't lock the cam bolts down. No boost, just 1500rpm cruising.
In hindsight, the street doesn't mean anything. If you consistently use a certain dyno, that and the track combined should be what you go off of.
Even at 9.1:1, I'd be looking at tearing in to it. I'd burn down a Vette that trapped 94mph in the 1/8 with an F1r. That's what NA bolt on vettes trap.
Thread Starter
Pro
Joined: Aug 2010
Posts: 578
Likes: 0
From: Texarkana Ar
Yeah , now that I have to pull trans and diff , I'm considering dropping everything out from under it, pull the engine apart , use what I can and put it into an iron block, and go with ported ls3 heads/intake.
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
If it's the exact same motor that ran strong before and your only change was the cam and now it's running slow, I'd make sure it's degreed and installed correctly
I know that's come up before, have you been able to check it?
I know that's come up before, have you been able to check it?
Thread Starter
Pro
Joined: Aug 2010
Posts: 578
Likes: 0
From: Texarkana Ar
Well in my past post with power issues the cam was forsure my issue, I had a custom spec'd cam from BTR, and when I removed the old turbo cam , I didn't realize I had a adjustable timing gear set, and it was several degrees advanced so when I installed the new cam I mistakenly installed it wrong. So I pulled the cam out and, bought a off the shelf proven dallas performance cam and installed the adjustable timing gear to 0 degrees. it did help alot, picked up up over 100hp in the power curve.
I plan on going ahead and stop wasting time and pull heads/cam and have someone with more experience re install cam/heads/pushrods etc...
I plan on going ahead and stop wasting time and pull heads/cam and have someone with more experience re install cam/heads/pushrods etc...
Thread Starter
Pro
Joined: Aug 2010
Posts: 578
Likes: 0
From: Texarkana Ar
My last question. Could there be anything wrong going on in the bottom end? Boost pushing past the cylinder rings, cracked cylinder walls possibly? I'm not sure what symptoms to look for if car isn't smoking or knocking.
Drifting
Joined: Dec 2012
Posts: 1,717
Likes: 28
From: O'Fallon IL
Well in my past post with power issues the cam was forsure my issue, I had a custom spec'd cam from BTR, and when I removed the old turbo cam , I didn't realize I had a adjustable timing gear set, and it was several degrees advanced so when I installed the new cam I mistakenly installed it wrong. So I pulled the cam out and, bought a off the shelf proven dallas performance cam and installed the adjustable timing gear to 0 degrees. it did help alot, picked up up over 100hp in the power curve.
I plan on going ahead and stop wasting time and pull heads/cam and have someone with more experience re install cam/heads/pushrods etc...
I plan on going ahead and stop wasting time and pull heads/cam and have someone with more experience re install cam/heads/pushrods etc...
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