LS2, Stock headers, 371rwhp?
Thread Starter
Burning Brakes
Joined: Mar 2010
Posts: 767
Likes: 12
From: Keller TX
LS2, Stock headers, 371rwhp?
I'm trying to get a C6 to fit into SCCA T1 (no more than 350rwhp from what I can tell) and NASA ST2. T1 is not a problem, the car sits at 350rwhp right now, its the NASA recipe I'm looking for. Given the weight of the car, I estimate I need to be at 371rwhp SAE on a dynojet in order to optimize the car for NASA ST2 (8.70lbs/hp). Since I'm a GM/LS2 newbie, (previous car was an E-85 Whipple 03' Cobra), can you all enlighten me on what is the most cost effective way to get to 371rwhp, or if that is even possible on a stock longblock? I'm trying to balance any mods by price and the effort to swap back and forth. If it is too costly or too time consuming, I'll just run with less HP and do my best. So, with a tune, or air intake, or TB, can I get to 371rwhp SAE? What other simple mods can I do (no UD pulleys).
Car is bone stock down to the paper air filter, cast iron manifolds, cats. It is a dry sump for longevity. The only other thing that deviates from OEM LS2 is that the mufflers are deleted, it just has dumps back there.
JK
Car is bone stock down to the paper air filter, cast iron manifolds, cats. It is a dry sump for longevity. The only other thing that deviates from OEM LS2 is that the mufflers are deleted, it just has dumps back there.
JK
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Can't help with details of your build but just wanted to suggest you might want to post in the Roadracing Forum to see what the guys who race have to offer. Have fun. 
http://forums.corvetteforum.com/auto...roadracing-23/
http://forums.corvetteforum.com/auto...roadracing-23/
Race Director
Joined: Mar 2007
Posts: 11,331
Likes: 18
From: Missouri City Texas
Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
I would say install a FAST intake if exhaust is not legal in that class.
A un-touched FAST on the LS2 would be worth 15 hp and 20 ft-lbs with the tuning.
I'm assuming you can run the car without mufflers, and you can install a cold air intake?
A un-touched FAST on the LS2 would be worth 15 hp and 20 ft-lbs with the tuning.
I'm assuming you can run the car without mufflers, and you can install a cold air intake?
Thread Starter
Burning Brakes
Joined: Mar 2010
Posts: 767
Likes: 12
From: Keller TX
I would say install a FAST intake if exhaust is not legal in that class.
NOTE: I CAN change the exhaust for NASA ST2 (not NASA), but I have no desire to spend 3.5 hours wrenching on the car to swap headers back and forth each time, from one weekend to the next depending on which group I run with. That is why I ruled out any exhaust swaps, its just not practical. I like driving the car, not working no it!
A un-touched FAST on the LS2 would be worth 15 hp and 20 ft-lbs with the tuning.
I'm assuming you can run the car without mufflers, and you can install a cold air intake?
NOTE: I CAN change the exhaust for NASA ST2 (not NASA), but I have no desire to spend 3.5 hours wrenching on the car to swap headers back and forth each time, from one weekend to the next depending on which group I run with. That is why I ruled out any exhaust swaps, its just not practical. I like driving the car, not working no it!
A un-touched FAST on the LS2 would be worth 15 hp and 20 ft-lbs with the tuning.
I'm assuming you can run the car without mufflers, and you can install a cold air intake?
1. CAI? What is this worth on this car with this setup?
2. Tune? Can I get there on a tune alone?
3. Intake (most money and effort)
Does that sound like the right order in terms of effort and $$? Any comments on the ability to get there with Tune or CAI only? Do I really have to do all 3 to get to 371rwhp on this setup?
Last edited by JerryTX; Mar 8, 2012 at 03:17 PM.
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Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
I can run without mufflers and I can run a CAI. Sounds like I have the following to play with:
1. CAI? What is this worth on this car with this setup?
2. Tune? Can I get there on a tune alone?
3. Intake (most money and effort)
Does that sound like the right order in terms of effort and $$? Any comments on the ability to get there with Tune or CAI only? Do I really have to do all 3 to get to 371rwhp on this setup?
1. CAI? What is this worth on this car with this setup?
2. Tune? Can I get there on a tune alone?
3. Intake (most money and effort)
Does that sound like the right order in terms of effort and $$? Any comments on the ability to get there with Tune or CAI only? Do I really have to do all 3 to get to 371rwhp on this setup?
Take this for example...
My 2006 Z51 M6 car put down 347 rwhp stock. Add LG LT's 383/383, add cold air and Borla mufflers 392/390, FAST 402/410. Now what you don't see is that the FAST picked up 24-27 ft-lbs from 2600-5200 RPM which is a HUGE change in the car. I don't see why a cold air and FAST would not get you into the 380's.
Thread Starter
Burning Brakes
Joined: Mar 2010
Posts: 767
Likes: 12
From: Keller TX
Cold air intakes are worth 5-8 rwhp on a stock car, the FAST is going to be the bulk of the changes. Once that is there, the tune is just going to help maximize what you have.
Take this for example...
My 2006 Z51 M6 car put down 347 rwhp stock. Add LG LT's 383/383, add cold air and Borla mufflers 392/390, FAST 402/410. Now what you don't see is that the FAST picked up 24-27 ft-lbs from 2600-5200 RPM which is a HUGE change in the car. I don't see why a cold air and FAST would not get you into the 380's.
Take this for example...
My 2006 Z51 M6 car put down 347 rwhp stock. Add LG LT's 383/383, add cold air and Borla mufflers 392/390, FAST 402/410. Now what you don't see is that the FAST picked up 24-27 ft-lbs from 2600-5200 RPM which is a HUGE change in the car. I don't see why a cold air and FAST would not get you into the 380's.
Burning Brakes
Joined: Apr 2007
Posts: 972
Likes: 11
From: Dawsonville, GA
Vararam CAI, out of the box untouched Fast 102 and a set of 1-7/8" headers got me 381rwhp/396rwtq through an '05 LS2 and A4 automatic. The car is otherwise bone stock. You should see more with a manual trans.
http://forums.corvetteforum.com/c6-t...ks-cartek.html
http://forums.corvetteforum.com/c6-t...ks-cartek.html
Last edited by Dragracer_Art; Mar 10, 2012 at 04:33 AM.
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
Oh it is VERY possible. 
A few of us have gotten very damn near 400rwhp with bone stock internal LS2 long blocks through automatics no less, so a manual (manuals obviously dyno higher than automatics, all else being equal) can definitely do it in my opinion.
Now that was with headers of course, but even without the headers a manual LS2 can still achieve 371+ with all of the other bolt ons in place.
A few of us have gotten very damn near 400rwhp with bone stock internal LS2 long blocks through automatics no less, so a manual (manuals obviously dyno higher than automatics, all else being equal) can definitely do it in my opinion.
Now that was with headers of course, but even without the headers a manual LS2 can still achieve 371+ with all of the other bolt ons in place.
Melting Slicks
Joined: Nov 2010
Posts: 2,626
Likes: 195
From: On the east coast we drive until we die
Are you going to be swapping tunes every week too? How safe is it to be racing a car with a tune optimized for mods that were removed, or vise-versa? Or is the addition/removal of a FAST not a major enough change to worry about the tune? For a street car I wouldn't even question it but if you're going all out at the track... I guess what I'm saying is make sure your tuner knows exactly what you'll be doing so he can tune accordingly. That is unless you will be tuning it yourself in which case I just added another useless post to my post count. :o
