SDPC 402 Dyno *Feedback Appreciated*
10-17-2006, 03:46 PM
#1
SDPC 402 Dyno *Feedback Appreciated* Below is the poop on my best dyno run at Texas Speed Performance.
I need some feedback on a better cam to get me into the 450-500 rwhp. Keep in mind that I drive the car daily, so I don't want to cannibalize my mileage. Right now I get 17mpg around town and 23 on the highway.
SDPC LS2 402, Patriot Stage II LS6 heads (2.055/1.57/59cc), Patriot Performance 226/585/112 cam, Harland-Sharp 1.7, FAST 90, Meziere, 42lb SVO injectors, SLP Underdrive Pulley, Walbro fuel pump, SPEC-3 clutch, Borla exhaust, Dynatech headers, static compression of 11.17:1
Ultimately I want to hit 11.95 @ 116 in the 3750lb 2006 6-speed GTO, But I want to have some auto-cross fun, and I need good low-midrange power for everyday practicality.
OCT 06 Dyno: 433rwhp/430rwtq
I need some feedback on a better cam to get me into the 450-500 rwhp. Keep in mind that I drive the car daily, so I don't want to cannibalize my mileage. Right now I get 17mpg around town and 23 on the highway.
SDPC LS2 402, Patriot Stage II LS6 heads (2.055/1.57/59cc), Patriot Performance 226/585/112 cam, Harland-Sharp 1.7, FAST 90, Meziere, 42lb SVO injectors, SLP Underdrive Pulley, Walbro fuel pump, SPEC-3 clutch, Borla exhaust, Dynatech headers, static compression of 11.17:1
Ultimately I want to hit 11.95 @ 116 in the 3750lb 2006 6-speed GTO, But I want to have some auto-cross fun, and I need good low-midrange power for everyday practicality.
OCT 06 Dyno: 433rwhp/430rwtq
Last edited by Gregory; 12-08-2008 at 03:55 PM.
10-17-2006, 04:07 PM
#3
I have an unported Fast 90 intake with the factory electronic 90mm throttle body. The exhaust has Borla high-flow catalytic converters. A while back SLP had their GTO make 484 rwhp / 452 rwtq without porting. It used a 596/.596, 250/246-duration, 114-centerline, 114 LSA cam. It ran 11.83 at 122-mph on a factory air intake.
Last edited by Gregory; 11-15-2006 at 09:15 AM. Reason: Add information on SLP car.
10-17-2006, 06:06 PM
#4
Originally Posted by Gregory
I have an unported Fast 90 intake with the factory electronic 90mm throttle body. The exhaust has Borla high-flow catalytic converters. A while back SLP had their GTO make 484 rwhp / 452 rwtq without porting. It used a 596/.596, 250/246-duration, 114-centerline, 114 LSA cam.
10-17-2006, 06:10 PM
#5
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What does it run right now? That massive torque curve carries over 400ft/lbs for over 2500rpm, I'd imagine it gets up and goes pretty good. Don't get too caught up in those peak numbers or what a different car made on a different dyno, go to the track first to get a solid idea of the power from your trap speeds, and then shop for the cam based on how much more trap speed you're lookin for. Dynos are great for tuning but.......
10-17-2006, 07:40 PM
#6
Yeah, the huge torque helps make the car feel lighter than it is. At the strip there is no way to get traction until I get drag bags for the springs and street radial drag tires. I get violent wheel hop in second gear. At the line I just idle off, and do not make power shifts. This nets me mid thirteens. The Lingenfelter CAI is one of the last things I have to install, but I can not see it changing the outcome by more than 10 hp/lbtq either way. I do have the K&N panel air filter, and the SLP car did more with less.
I deploy for Iraq around the end of the month, so this project will likely wait until I return. I just want to know what direction to take when I return.
I deploy for Iraq around the end of the month, so this project will likely wait until I return. I just want to know what direction to take when I return.
10-17-2006, 08:01 PM
#7
Originally Posted by Gregory
The Lingenfelter CAI is one of the last things I have to install, but I can not see it changing the outcome by more than 10 hp/lbtq either way. I do have the K&N panel air filter, and the SLP car did more with less.
.
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I've gained 35-40hp opening up intake tracts on Vette's.Not saying your's will but the GTO intake setup is really restrictive.Forget SLP results.It's like pissing in the wind and having a wet pant leg after.
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10-17-2006, 08:29 PM
#8
Even the torque is low for such a small cam on a 402 with healthy compression. I'd expect at least 460 but more like 480-490 with such a small camshaft. So, you may have a problem with the motor. I'd recommend a compression check.
After that, I'd change: Stock intake system for the LPE CAI, Harland Sharp rockers for stock rockers (weight over the valve = evil), and the cam to at least a mid 230s duration XE-R or better cam. The MS3 from TSP would be a good cam, actually.
The Patriot heads aren't great, but they should support 470-480wrhp without much trouble.
After that, I'd change: Stock intake system for the LPE CAI, Harland Sharp rockers for stock rockers (weight over the valve = evil), and the cam to at least a mid 230s duration XE-R or better cam. The MS3 from TSP would be a good cam, actually.
The Patriot heads aren't great, but they should support 470-480wrhp without much trouble.
10-18-2006, 01:21 PM
#11
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Compcam XER 236/236 w/ 600+ lift on a 112.
I agreee with slowhawk on both statements, upgrade the air intake and forget SLP's claims. I watched there 500rwph car do 12's all day at the track a few years ago. Power doesnt alway equeal speed.
I agreee with slowhawk on both statements, upgrade the air intake and forget SLP's claims. I watched there 500rwph car do 12's all day at the track a few years ago. Power doesnt alway equeal speed.
10-18-2006, 02:33 PM
#12
Actually that is the point where the car made it's best power. The a/f was moved around a little bit just to be sure. We were thinking a MS3 might be a nice swap without giving up much low end. It would still be a fairly small camshaft for a 402, but it should make good power..
Originally Posted by pianoprodigy
Cam is quite small. Also, AFR is still kinda rich for an NA application. Who is doing your tuning?
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10-18-2006, 08:50 PM
#15
Originally Posted by Gregory
I have an unported Fast 90 intake with the factory electronic 90mm throttle body. The exhaust has Borla high-flow catalytic converters. A while back SLP had their GTO make 484 rwhp / 452 rwtq without porting. It used a 596/.596, 250/246-duration, 114-centerline, 114 LSA cam.
10-18-2006, 09:24 PM
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Originally Posted by Gregory
Yeah, the huge torque helps make the car feel lighter than it is. At the strip there is no way to get traction until I get drag bags for the springs and street radial drag tires. I get violent wheel hop in second gear. At the line I just idle off, and do not make power shifts. This nets me mid thirteens. The Lingenfelter CAI is one of the last things I have to install, but I can not see it changing the outcome by more than 10 hp/lbtq either way. I do have the K&N panel air filter, and the SLP car did more with less.
I deploy for Iraq around the end of the month, so this project will likely wait until I return. I just want to know what direction to take when I return.
I deploy for Iraq around the end of the month, so this project will likely wait until I return. I just want to know what direction to take when I return.
These guys are right about the CAI waking up alot of power on a big inch motor, I also hear alot about the stock 90TB being not so great at these power levels. Good luck!
10-18-2006, 09:29 PM
#17
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Originally Posted by Gregory
Below is the poop on my best dyno run at Texas Speed Performance.
I need some feedback on a better cam to get me into the 450-500 rwhp. Keep in mind that I drive the car daily, so I don't want to cannibalize my mileage. Right now I get 17mpg around town and 23 on the highway.
SDPC LS2 402, Patriot Stage II LS6 heads (2.055/1.57/59cc), Patriot Performance 226/585/112 cam, Harland-Sharp 1.7, FAST 90, Meziere, 42lb SVO injectors, SLP Underdrive Pulley, Walbro fuel pump, SPEC-3 clutch, Borla exhaust, Dynatech headers, static compression of 11.17:1
Ultimately I want to hit 11.95 @ 116 in the 3750lb 2006 6-speed GTO, But I want to have some auto-cross fun, and I need good low-midrange power for everyday practicality.
OCT 06 Dyno: 433rwhp/430rwtq
I need some feedback on a better cam to get me into the 450-500 rwhp. Keep in mind that I drive the car daily, so I don't want to cannibalize my mileage. Right now I get 17mpg around town and 23 on the highway.
SDPC LS2 402, Patriot Stage II LS6 heads (2.055/1.57/59cc), Patriot Performance 226/585/112 cam, Harland-Sharp 1.7, FAST 90, Meziere, 42lb SVO injectors, SLP Underdrive Pulley, Walbro fuel pump, SPEC-3 clutch, Borla exhaust, Dynatech headers, static compression of 11.17:1
Ultimately I want to hit 11.95 @ 116 in the 3750lb 2006 6-speed GTO, But I want to have some auto-cross fun, and I need good low-midrange power for everyday practicality.
OCT 06 Dyno: 433rwhp/430rwtq
10-18-2006, 11:49 PM
#18
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my grandma would run a bigger cam than that if she built a 402 
https://ls1tech.com/forums/dynamometer-results-comparisons/588600-how-much-do-i-stand-gain.html
https://ls1tech.com/forums/dynamometer-results-comparisons/588600-how-much-do-i-stand-gain.html
10-19-2006, 09:46 AM
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Wow thats a pretty low statement. The guys at SDPC have been friends with us for a long time! I don't think this guy is saying for one minute he's unhappy with the car, I think he just wants ideas for a little more power.
We work with the guys @ SDPC daily, they're always quick to help us & we're always quick to do the same for them.
That vehicle was tuned prior to arriving at TSP, the only thing we changed here was the air fuel. The next time you feel the need to question a vendors integrity when you know nothing about the situation, do us all a favor and don't... It's just really low class...
Brian
We work with the guys @ SDPC daily, they're always quick to help us & we're always quick to do the same for them.
That vehicle was tuned prior to arriving at TSP, the only thing we changed here was the air fuel. The next time you feel the need to question a vendors integrity when you know nothing about the situation, do us all a favor and don't... It's just really low class...
Brian
Originally Posted by No Juice
Did anyone else see his parts list and then where he had it tuned and dynoed???
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01 NBM Z28- A4 w/3.23s, TSP Black Lid, Hooker Catback, Pacesetter Headers w/ORY, ASP Pulley, Ported Throttle Body, TSP Torq. v3(231/234) Camshaft, TCI 4400, PRC Stg 1 Heads
Texas Speed & Performance
www.texas-speed.com
(806) 866-0734
01 NBM Z28- A4 w/3.23s, TSP Black Lid, Hooker Catback, Pacesetter Headers w/ORY, ASP Pulley, Ported Throttle Body, TSP Torq. v3(231/234) Camshaft, TCI 4400, PRC Stg 1 Heads
Texas Speed & Performance
www.texas-speed.com
(806) 866-0734