LS2 402 power
Burning Brakes
Joined: Apr 2002
Posts: 1,020
Likes: 9
From: Ft. Collins, CO
I belive 500rwhp is very feasible. My buddy just had LG install and tune an SLP 402 Iron block with an LG H/C package. On 91 he put down 476rwhp/480rwtq and this was with 10.8.1 CR. On 93 he made a litlet more. I don't remember the exact numbers. I hope this helps. PM me if you want his exact set up.
Tony
Tony
Former Vendor
Joined: Feb 2004
Posts: 9,615
Likes: 13
From: Burlington NC
We did a simular package here in the shop. SLP short block with a LGM GX2 (I think that's the right cam) AFR heads and we saw 475 to the wheels with simular torque. Some more aggresive on the cam and you should be able to see your target numbers.
Randy
Randy
Former Vendor
Joined: May 2005
Posts: 3,749
Likes: 4
From: Valencia Ca
Originally Posted by monstermouse
Can anyone share their RWHP & TQ for a 402 natural. Trying to determine if 500+ is feasible. Thanks.
Customer will not pick up until Saturday...still time for a test ride!
Charlie
Instructor
Joined: Jun 2005
Posts: 155
Likes: 0
From: Brooklyn Park MN
Originally Posted by Randy@DRM
We did a simular package here in the shop. SLP short block with a LGM GX2 (I think that's the right cam) AFR heads and we saw 475 to the wheels with simular torque. Some more aggresive on the cam and you should be able to see your target numbers.
Randy
Randy
I remember that car.
Remember I have high flow cats with a Z06 TI and still got 475 RWHP. If I removed the cats and got a more free flowing exhaust I bet it would make 500 RWHP.
Former Vendor
Joined: Feb 2004
Posts: 9,615
Likes: 13
From: Burlington NC
Steve it's funny that you rember the car. It maybe in the garage at your house. 
By the way, your dad came by the other day, I hope you got the package! He is a pretty funny guy.
Charlie,
You guys are getting into the exhaust business now? Let me know what type of exhaust stuff you guys come up with. Because your stuff works!!! We have been super happy with the supercharger packages you guys make.
Randy
By the way, your dad came by the other day, I hope you got the package! He is a pretty funny guy.Charlie,
You guys are getting into the exhaust business now? Let me know what type of exhaust stuff you guys come up with. Because your stuff works!!! We have been super happy with the supercharger packages you guys make.
Randy
Former Vendor
Joined: May 2005
Posts: 3,749
Likes: 4
From: Valencia Ca
Originally Posted by SteveDR425
I remember that car.
Remember I have high flow cats with a Z06 TI and still got 475 RWHP. If I removed the cats and got a more free flowing exhaust I bet it would make 500 RWHP.
Remember I have high flow cats with a Z06 TI and still got 475 RWHP. If I removed the cats and got a more free flowing exhaust I bet it would make 500 RWHP.
Our new 3" exhaust project was launched on the premise that there was a significant power increase to be had (specifically on strokers and supercharged apps) and the results of that project have been impressive!
We built a solid baseline number around a 402, AFR heads, Kooks 1 7/8" heades, high flow cats, 3" x-pipe, and B&B Bullets. Tuning was optimized and we maxed @ 487 RWHP / 452 RWT
Next, we pulled the cat back completely off and re-tuned - we maxed @ 499 RWHP / 464 RWT
Finally, we installed our 3" system and re-tuned - the results were interesting...we maxed @ 501 RWHP / 467 RWT
Charlie
Team Owner
Joined: May 2004
Posts: 26,345
Likes: 232
From: SoCal
Originally Posted by CharlieTuner@AandACorvette
Next, we pulled the cat back completely off and re-tuned - we maxed @ 499 RWHP / 464 RWT
Charlie
DH
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Former Vendor
Joined: Feb 2004
Posts: 9,615
Likes: 13
From: Burlington NC
I thought it was a train, but now I know it was just the guys at A&A having some fun. I love the sound of wide open exhaust. The sound of a motor humpping down a straight away, puts a smile on my face. The chassis dyno is the next closes thing.
Randy
Randy
Supporting Vendor
Joined: Feb 2000
Posts: 7,302
Likes: 1
From: Los Angeles, CA
St. Jude Donor '03-'04-'05-'06
Originally Posted by monstermouse
Can anyone share their RWHP & TQ for a 402 natural. Trying to determine if 500+ is feasible. Thanks.
This car was awesome. It was a 2004 CE Z16 Z06 with only 800 miles on it.
I haven't driven a car like that in a long time.
Here is the dyno sheet.
Shawn
Last edited by L.A.P.D.; Sep 23, 2005 at 09:09 PM.
Racer
Joined: Jan 2001
Posts: 386
Likes: 0
From: Gothenborg
Iam very intrested in this setup , how is the idle with these motors which dyno at 475 rwhp + rough ? May a motor like this pass smog inspec. ? How much is the price for a SLP-short LS2 402 with forged intern. + AFR225 heads,cam and a Fast intake with a 90mm TB(ins hort a complete long block ready to install in a c5 Z06) ?
Thanx in advance
Thanx in advance
Former Vendor
Joined: May 2005
Posts: 3,749
Likes: 4
From: Valencia Ca
Originally Posted by John Shiels
There on some out there with 575 RWHP but $$$$$$$$$$ heads.
Our highest 402 to date, with AFR 225 heads, 533 RWHP 488 RWT
Last edited by C_Williams; Sep 24, 2005 at 12:04 AM. Reason: Added Graph
Former Vendor
Joined: May 2005
Posts: 3,749
Likes: 4
From: Valencia Ca
Le Mans Master
Joined: Dec 2003
Posts: 7,506
Likes: 0
From: Hillsborough NJ
Stay tuned...Doug Ring at ECS is in the process of a forged 402 build that will go into his coupe (Chris's "old" car). I won't divulge all the "goodies" going into this engine except I do know its getting a pretty hefty cam...LG's G5X4, among other things. I predict that this engine will approach 550 rwhp and 475 rwtq. 
Time will tell.
I predict that this engine will approach 550 rwhp and 475 rwtq. Time will tell.
Former Vendor
Joined: May 2005
Posts: 3,749
Likes: 4
From: Valencia Ca
Melting Slicks
Joined: Nov 1999
Posts: 2,343
Likes: 854
From: MI
Cruise-In VI Veteran
[QUOTE=CharlieTuner@AandACorvette]Our highest 402 to date, with AFR 225 heads, 533 RWHP 488 RWT
Nice numbers, I like that TQ Curve. Can you post the Mechanical Specs of this engine?
Kevin
Nice numbers, I like that TQ Curve. Can you post the Mechanical Specs of this engine?
Kevin