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The motor is a stock LQ4 with a LS1 intake and a sloppy best cam 219/225 110Lsa and .595 lift and a cast 7875 turbo. It feels great in the mid range (3-5k) but feels like it falls off in the upper rpm’s. I’m assuming the LS1 intake causing it. Heads I’ve got on hand are 706,799,823 heads. The 706 heads with a substantial bump in compression would help across the board but not sure if the intake would still choke it down. Or mill the 823 heads a little and get an LS3 intake? Looking for any advice or game plan
If you want the most lack luster results ever for the most money spent, chase things like expensive intakes. Heads are always nice, but I doubt thats a bottle neck. Might start with something useful like how much boost you are running. Tune up, fuel used, etc...
Its not the intake or the cam. It should pull to 6600++ with a turbo. You’ve got other issues if it doesn’t. What is the boost at? Just add a progressive boost curve if the turbos not maxed out.
Running 93 pump, 8psi, wired for flex but I dont think the tune is done for it. Full 3" exhaust with a resonator. Ebay intercooler setup with cast 7875. My concern (other than the intake) is my clutch and not sure if I'm blowing thru it in the upper rpm's but not sure how to figure that part out. The clutch is a Texas Drivetrain Performance Diamond.....rated for 475 torque. Here's my timing table
4Eyed:
"Running 93 pump, 8psi, wired for flex but I dont think the tune is done for it. Full 3" exhaust with a resonator. Ebay intercooler setup with cast 7875""---
If you are describing 3 INCH Single exhaust- There's your restriction. If it's TWO pipes, then - "Never Mind"
The motor is a stock LQ4 with a LS1 intake and a sloppy best cam 219/225 110Lsa and .595 lift and a cast 7875 turbo. It feels great in the mid range (3-5k) but feels like it falls off in the upper rpm’s. I’m assuming the LS1 intake causing it. Heads I’ve got on hand are 706,799,823 heads. The 706 heads with a substantial bump in compression would help across the board but not sure if the intake would still choke it down. Or mill the 823 heads a little and get an LS3 intake? Looking for any advice or game plan
4Eyed:
"Running 93 pump, 8psi, wired for flex but I dont think the tune is done for it. Full 3" exhaust with a resonator. Ebay intercooler setup with cast 7875""---
If you are describing 3 INCH Single exhaust- There's your restriction. If it's TWO pipes, then - "Never Mind"
he named all of his issues in this one paragraph.
#1 dont know about tune? Yikes
#2 full 3" exhaust, needs to be 4" and ditch the resonator
#3- 8 psi of boost? Turn it up when issues addressed
#4 ebay intercooler can be a wide spread of things, i can buy a name brand intercooler on ebay and push 1000 wheel or i can buy a junk one that struggles to push 500. Need more detail then that.
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Not fast enough anymore, which head/intake setup? 
