Final #s on my 402
Thread Starter
On The Tree
Joined: Jan 2005
Posts: 112
Likes: 0
From: Boulder, CO
Final #s on my 402 After the first dyno session that only got 407rwhp, and then 46Xrwhp with open headers, I ordered a Random-Tech x-pipe with hiflow cats, GHL exhaust, and Halltech Stinger intake. The shop installed it all, and tuned again, and got 448rwhp, 433ft-lbs of torque. Pretty low for a 402 
.
Mods:
LS2 402
Patriot Stage 3 heads
Comp XE-R 238/244 cam
LS6 intake manifold (stock TB, stock MAF)
Stainless Works 1 3/4" LT headers
Random Tech hi-flow cats and X-Pipe
GHL exhaust
42lb injectors
Halltech Stinger air filter
underdrive pulley
NLP (Next Level Performance) dyno-tune
.Mods:
LS2 402
Patriot Stage 3 heads
Comp XE-R 238/244 cam
LS6 intake manifold (stock TB, stock MAF)
Stainless Works 1 3/4" LT headers
Random Tech hi-flow cats and X-Pipe
GHL exhaust
42lb injectors
Halltech Stinger air filter
underdrive pulley
NLP (Next Level Performance) dyno-tune
TECH Apprentice
Joined: Sep 2005
Posts: 370
Likes: 0
From: DFW, TX
bro i have been waiting to see what happened. at least its not on the low low side like it was. after reading tony mamo's posts. i would say its a combination of intake, heads and cam, although that cam should be the right cam based on tony's comments regarding over cam'n. this isnt a big cam.
the real question is how does the car drive?
the real question is how does the car drive?
Originally Posted by Miles in Florida
After the first dyno session that only got 407rwhp, and then 46Xrwhp with open headers, I ordered a Random-Tech x-pipe with hiflow cats, GHL exhaust, and Halltech Stinger intake. The shop installed it all, and tuned again, and got 448rwhp, 433ft-lbs of torque. Pretty low for a 402 .
Mods:
LS2 402
Patriot Stage 3 heads
Comp XE-R 238/244 cam
LS6 intake manifold (stock TB, stock MAF)
Stainless Works 1 3/4" LT headers
Random Tech hi-flow cats and X-Pipe
GHL exhaust
42lb injectors
Halltech Stinger air filter
underdrive pulley
NLP (Next Level Performance) dyno-tune
.Mods:
LS2 402
Patriot Stage 3 heads
Comp XE-R 238/244 cam
LS6 intake manifold (stock TB, stock MAF)
Stainless Works 1 3/4" LT headers
Random Tech hi-flow cats and X-Pipe
GHL exhaust
42lb injectors
Halltech Stinger air filter
underdrive pulley
NLP (Next Level Performance) dyno-tune
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Thread Starter
On The Tree
Joined: Jan 2005
Posts: 112
Likes: 0
From: Boulder, CO
Originally Posted by CHRISPY
What is your SCR and DCR?
Originally Posted by Cyborg
What's your LSA and CR?
is the car an automatic? If so, are you sure they locked up the converter. The numbers will be way low if they did not lock it up.
The cam and headers are fine, there have been plenty of people make 500+ on them.
Intake/TB/MAF are fine as there have been numerous people make 470+ with those. (You would benefit from a FAST 90/90 setup... but it's not choking you off bad enough to account for a 50+ horsepower loss)
There have also been quite a few people make good horsepower with the Patriot Stage 3 heads on 400" motors.
We really need more information on the rest of the car's drivetrain to assess what is truly wrong with your dyno numbers.
The cam and headers are fine, there have been plenty of people make 500+ on them.
Intake/TB/MAF are fine as there have been numerous people make 470+ with those. (You would benefit from a FAST 90/90 setup... but it's not choking you off bad enough to account for a 50+ horsepower loss)
There have also been quite a few people make good horsepower with the Patriot Stage 3 heads on 400" motors.
We really need more information on the rest of the car's drivetrain to assess what is truly wrong with your dyno numbers.
Thread Starter
On The Tree
Joined: Jan 2005
Posts: 112
Likes: 0
From: Boulder, CO
Originally Posted by xaon
is the car an automatic? ...
We really need more information on the rest of the car's drivetrain to assess what is truly wrong with your dyno numbers.
We really need more information on the rest of the car's drivetrain to assess what is truly wrong with your dyno numbers.
Originally Posted by kumar75150
cam is too small, headers are too small, intake and TB are stock, heads are probably below average for that size motor
still should make around 465-470 i would think
still should make around 465-470 i would think
+1 for headers, intake, TB. Also, there's probably alot more left in the tuning.
Was it throwing any codes? Sometimes that can lead to something else like a bad O2 sensor or knock sensor. Both of which can KILL power...
On The Tree
Joined: Nov 2005
Posts: 186
Likes: 0
In case you didn't know, Norris's dyno is very conservative. Even with that those numbers are a little low. You will gain around 20whp with a FAST 90/90 combo.
The cam seems fine for this combination. Not too much, not too little. My uncle's 404ci Z06 has the same exhaust setup as you except for his Borla Stingers. I wonder if he loosing a bit of power because of the headers?
The cam seems fine for this combination. Not too much, not too little. My uncle's 404ci Z06 has the same exhaust setup as you except for his Borla Stingers. I wonder if he loosing a bit of power because of the headers?
Thread Starter
On The Tree
Joined: Jan 2005
Posts: 112
Likes: 0
From: Boulder, CO
Originally Posted by NumberOneSled
What did Norris say?
I agree with him (and all of you) that the intake is a bottle neck, and I could have gotten better heads, and a different cam, but it still seems like my numbers are low for the parts I've got. It's hard to find someone with the exact same setup, but it seems like similar cars have gotten 470+, so perhaps I'm only down 20rwhp right now. That might be explainable by his dyno reading low (as I've heard from several people), but I won't beleive that until I dyno "high" somewhere else. I'll look for a dyno in Denver when the car makes it out here.
- Miles
Originally Posted by Miles in Florida
I hope not, I assume Mike would have told me if it was.
If the check engine light is on, you may need to scan for codes. I took mine to Autozone and the scanned it for free. That could give you some clues to start with.