Turbo boost and 4.10s
Turbo boost and 4.10s I currently have an APS TT on a C6 MM6.
The car had 4.10s prior to TT install.
All the ingredients are there for power.
spark is at ~16*
AFR at WOT is ~11.8
Manifold boost runs 6.5 basically flat from 2800 rpm
But he RWHP runs basically flat at around 400RWHP on a Dynodynamics.
What gives?
Engine is healthy
Compression test is ~205 # +/- 1%
Leakdown is 2%-3% all cylinders
IS 4.10s the issue?
Any suggestions?
Bob
The car had 4.10s prior to TT install.
All the ingredients are there for power.
spark is at ~16*
AFR at WOT is ~11.8
Manifold boost runs 6.5 basically flat from 2800 rpm
But he RWHP runs basically flat at around 400RWHP on a Dynodynamics.
What gives?
Engine is healthy
Compression test is ~205 # +/- 1%
Leakdown is 2%-3% all cylinders
IS 4.10s the issue?
Any suggestions?
Bob
I am not 100% sure that is all of your problem, but the gear's are not helping you at all!! I think you should have at least no higher than a 3.42! I have 3.23 and love them! The gear's are a good place to start.
TECH Enthusiast
Joined: Mar 2004
Posts: 604
Likes: 0
From: Loganville, GA
I have a hard time believing you're only making 400rwhp with 6.5psi on an LS2 motor.... Is the dyno messed up or something? Geez.
But yeah.. Those gears have got to go.
3.23
3.42
3.55's may not even be enough... I think it would be a tossup between 3.42s and 3.23s
But yeah.. Those gears have got to go.
3.23
3.42
3.55's may not even be enough... I think it would be a tossup between 3.42s and 3.23s
All you guys above; thanks for your responses.
On various boards I am getting mixed opinions. Some say that 4.10s will have no effect. I am leaning toward them having an effect on my problem.
thanks
Bob
On various boards I am getting mixed opinions. Some say that 4.10s will have no effect. I am leaning toward them having an effect on my problem.
thanks
Bob
Valvesprings... Although a higher numerical gear ratio will yield a lower dyno number it will be a mirror of another gear. Post your graph, if you see power level off and flatline, its springs.
TECH Enthusiast
Joined: Mar 2004
Posts: 604
Likes: 0
From: Loganville, GA
I don't know what mind I was in earlier... I neglected to even think about valvesprings.
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I am just going to throw this out there! It is probably not what is wrong ,but did the tuner turn off the torque managment on you car?? I have heard that it will pull timing out when the car is under excessive torque. Like I said,probably not the problem you are having,might not have anything to do with it.Never hurt's to ask.
I'm making over 400rwhp at 7psi with a stock lt1 engine and single rearmount turbo. Those dyno numbers were with 4:10 gears also on the mustang dyno. Over the summer I went with a 350 gear ratio and it made a huge difference -it allows the turbo to spool up and run into boost longer -
Nmbr1GMfan
If I was guaranteed that was the fix, I would change them in a second.
Did you change the springs on your GTO install?
Too many similar setups to mine with 6psi and 500+ rwhp and no spring change.
If I was guaranteed that was the fix, I would change them in a second.
Did you change the springs on your GTO install?
Too many similar setups to mine with 6psi and 500+ rwhp and no spring change.
