LT's vs. Boost Loss
Thread Starter
Racer
Joined: Oct 2009
Posts: 251
Likes: 3
From: Tahlequah Oklahoma
LT's vs. Boost Loss
I have a all stock motor 2007 Z51 A6 car with a A@A SC kit (V2 SI Trim)
making 8.5-9 lbs with a 4.0 sc pulley and meth. I am wanting to put long tube headers with high flow cats and leave the factory mufflers for now, how much boost will I loose, will a 3.8 pulley get me back to the same boost lbs? Will a 3.6 be way too much for a stock bottom end? I am wanting a "safe" 560-590 whp
Thanks in advance.
making 8.5-9 lbs with a 4.0 sc pulley and meth. I am wanting to put long tube headers with high flow cats and leave the factory mufflers for now, how much boost will I loose, will a 3.8 pulley get me back to the same boost lbs? Will a 3.6 be way too much for a stock bottom end? I am wanting a "safe" 560-590 whp
Thanks in advance.
Last edited by chevpwr; Dec 25, 2009 at 06:49 PM.
Melting Slicks
Joined: Dec 2008
Posts: 2,296
Likes: 3
I have a all stock motor 2007 Z51 A6 car with a A@A SC kit (V2 SI Trim)
making 8.5-9 lbs with a 4.0 sc pulley and meth. I am wanting to put long tube headers with high flow cats and leave the factory mufflers for now, how much boost will I loose, will a 3.8 pulley get me back to the same boost lbs? Will a 3.6 be way too much for a stock bottom end? I am wanting a "safe" 560-590 whp
Thanks in advance.
making 8.5-9 lbs with a 4.0 sc pulley and meth. I am wanting to put long tube headers with high flow cats and leave the factory mufflers for now, how much boost will I loose, will a 3.8 pulley get me back to the same boost lbs? Will a 3.6 be way too much for a stock bottom end? I am wanting a "safe" 560-590 whp
Thanks in advance.
Thread Starter
Racer
Joined: Oct 2009
Posts: 251
Likes: 3
From: Tahlequah Oklahoma
Drifting
Joined: Jun 2008
Posts: 1,778
Likes: 3
From: PNW
I have a all stock motor 2007 Z51 A6 car with a A@A SC kit (V2 SI Trim)
making 8.5-9 lbs with a 4.0 sc pulley and meth. I am wanting to put long tube headers with high flow cats and leave the factory mufflers for now, how much boost will I loose, will a 3.8 pulley get me back to the same boost lbs? Will a 3.6 be way too much for a stock bottom end? I am wanting a "safe" 560-590 whp
Thanks in advance.
making 8.5-9 lbs with a 4.0 sc pulley and meth. I am wanting to put long tube headers with high flow cats and leave the factory mufflers for now, how much boost will I loose, will a 3.8 pulley get me back to the same boost lbs? Will a 3.6 be way too much for a stock bottom end? I am wanting a "safe" 560-590 whp
Thanks in advance.
Do a retune after the headers install, the car should be able to pick up more timing due to the less restrictive exhaust AND due to less boost, could end up with a decent gain and not want to pulley down.
Thread Starter
Racer
Joined: Oct 2009
Posts: 251
Likes: 3
From: Tahlequah Oklahoma
It is tuned really safe at 501-510 whp
Thread Starter
Racer
Joined: Oct 2009
Posts: 251
Likes: 3
From: Tahlequah Oklahoma
Drifting
Joined: Jun 2008
Posts: 1,778
Likes: 3
From: PNW
Did you do that new A&A inlet "dongle"?? Seems to be a good mod.
im thinking, do that and the headers and a retune. Maybe this time not a REALLY safe one, but a safe one.
I dont beleive there is such thing as a safe and unsafe tune, tune for ~11.3- 11.8 AFR, and give it ENOUGH timing until it knocks and then back off a little, some tuners just seem to have a certain "number" in their minds, like "for this combo id run 17degrees" well on my previous SC Z06, it was a stock motor 11:1 CR and 5psi of boost, catless headers - so in real it was pulleyed for 6.5psi but was seeing 5 only. I was running 22degrees of timing on the very top, and the car NEVER EVER had a problem.
do those two mods + a retune.
im thinking, do that and the headers and a retune. Maybe this time not a REALLY safe one, but a safe one.
I dont beleive there is such thing as a safe and unsafe tune, tune for ~11.3- 11.8 AFR, and give it ENOUGH timing until it knocks and then back off a little, some tuners just seem to have a certain "number" in their minds, like "for this combo id run 17degrees" well on my previous SC Z06, it was a stock motor 11:1 CR and 5psi of boost, catless headers - so in real it was pulleyed for 6.5psi but was seeing 5 only. I was running 22degrees of timing on the very top, and the car NEVER EVER had a problem.
do those two mods + a retune.
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Thread Starter
Racer
Joined: Oct 2009
Posts: 251
Likes: 3
From: Tahlequah Oklahoma
Did you do that new A&A inlet "dongle"?? Seems to be a good mod.
im thinking, do that and the headers and a retune. Maybe this time not a REALLY safe one, but a safe one.
I dont beleive there is such thing as a safe and unsafe tune, tune for ~11.3- 11.8 AFR, and give it ENOUGH timing until it knocks and then back off a little, some tuners just seem to have a certain "number" in their minds, like "for this combo id run 17degrees" well on my previous SC Z06, it was a stock motor 11:1 CR and 5psi of boost, catless headers - so in real it was pulleyed for 6.5psi but was seeing 5 only. I was running 22degrees of timing on the very top, and the car NEVER EVER had a problem.
do those two mods + a retune.
im thinking, do that and the headers and a retune. Maybe this time not a REALLY safe one, but a safe one.
I dont beleive there is such thing as a safe and unsafe tune, tune for ~11.3- 11.8 AFR, and give it ENOUGH timing until it knocks and then back off a little, some tuners just seem to have a certain "number" in their minds, like "for this combo id run 17degrees" well on my previous SC Z06, it was a stock motor 11:1 CR and 5psi of boost, catless headers - so in real it was pulleyed for 6.5psi but was seeing 5 only. I was running 22degrees of timing on the very top, and the car NEVER EVER had a problem.
do those two mods + a retune.
Safety Car
Joined: Oct 2001
Posts: 4,945
Likes: 0
From: Dallas/Valley Ranch TEXAS!!!
LT's are great, and will only make your setup more efficient, and will add power... however, you could also just change to a smaller pulley and add more boost to get to your goal... just a thought to save you money for now, but LT's are a must at some point in the quest for more power for sure...
Thread Starter
Racer
Joined: Oct 2009
Posts: 251
Likes: 3
From: Tahlequah Oklahoma
LT's are great, and will only make your setup more efficient, and will add power... however, you could also just change to a smaller pulley and add more boost to get to your goal... just a thought to save you money for now, but LT's are a must at some point in the quest for more power for sure...
Drifting
Joined: Jun 2008
Posts: 1,778
Likes: 3
From: PNW
its just the small peice that connects the blower inlet to the filter, and he has a revised one released about two months ago, I dont know if youre car has it but I doubt it does.
Again, this + headers and a retune might get you closer to you're goals without having to pulley down.
Melting Slicks
Joined: Dec 2008
Posts: 2,296
Likes: 3
Thread Starter
Racer
Joined: Oct 2009
Posts: 251
Likes: 3
From: Tahlequah Oklahoma
call Andy himself and ask him about it, and about the power gains from it.
its just the small peice that connects the blower inlet to the filter, and he has a revised one released about two months ago, I dont know if youre car has it but I doubt it does.
Again, this + headers and a retune might get you closer to you're goals without having to pulley down.
its just the small peice that connects the blower inlet to the filter, and he has a revised one released about two months ago, I dont know if youre car has it but I doubt it does.
Again, this + headers and a retune might get you closer to you're goals without having to pulley down.
I appreciate all the advice
Last edited by chevpwr; Dec 25, 2009 at 07:46 PM.
Drifting
Joined: Jun 2008
Posts: 1,778
Likes: 3
From: PNW
I want to pulley it down, these kits come with a 3.8 and mine has a 4.0 so I want to at least get back to what it had on it, and since I will have to retune it I was going to put on the headers as well. Just wondering what pulley to go with. Maybe I do need to talk to Andy, I just figured my set up has been done a lot.
I appreciate all the advice
I appreciate all the advice
Do ask him about the dongle.
get the 3.8, and the catted headers, and a retune you SHOULD reach ur goals.
Thread Starter
Racer
Joined: Oct 2009
Posts: 251
Likes: 3
From: Tahlequah Oklahoma
Thread Starter
Racer
Joined: Oct 2009
Posts: 251
Likes: 3
From: Tahlequah Oklahoma
I have a all stock motor 2007 Z51 A6 car with a A@A SC kit (V2 SI Trim)
making 8.5-9 lbs with a 4.0 sc pulley and meth. I am wanting to put long tube headers with high flow cats and leave the factory mufflers for now, how much boost will I loose, will a 3.8 pulley get me back to the same boost lbs? Will a 3.6 be way too much for a stock bottom end? I am wanting a "safe" 560-590 whp
Thanks in advance.
making 8.5-9 lbs with a 4.0 sc pulley and meth. I am wanting to put long tube headers with high flow cats and leave the factory mufflers for now, how much boost will I loose, will a 3.8 pulley get me back to the same boost lbs? Will a 3.6 be way too much for a stock bottom end? I am wanting a "safe" 560-590 whp
Thanks in advance.
Thread Starter
Racer
Joined: Oct 2009
Posts: 251
Likes: 3
From: Tahlequah Oklahoma
I live in Oklahoma so I was going to have Dallas Performance tune the car after all the changes. I got a HP Tuner with the car but have not had time to play with it yet.
Last edited by chevpwr; Dec 25, 2009 at 08:35 PM.