411 rwhp F-body with stock exhaust manifolds and cats
08-05-2005, 11:00 AM
#1
411 rwhp F-body with stock exhaust manifolds and cats Well it was time to take the CheaTR package to an even higher level. After seeing a pretty strong vacuum signal at WOT, I knew the motor was intake restricted. After seeing his success with his C5, I contacted Tony Mamo from Airflow Research to help me with my increased appetite for air. Tony velocity ported a FAST 90mm intake manifold for me and I recently had it installed at Thunder Racing. Also added were a Nick Williams 90mm throttle body, Racetronix Plug and Plug fuel system and Racetronix 37lb. injectors (because my previous fuel system was maxed out).
Wednesday evening, we re-baselined my car. I was a little disappointed that it was down about 10 rwhp from when I last dynoed in April. Maybe the warm muggy August air had something to do with it being a little low. Regardless, the results of the Mamofied FAST 90/90 combination were ASTOUNDING. Check out this dyno:
That's a gain of around 27 rwhp! With stock exhaust manifolds and cats? The gains were incredible. Even at 2500 rpm, we were up around 10 rwtq. Peak torque increased 20. Everybody told me I was wasting my time adding a FAST 90/90 to a car running a 215 @ .050 cam. For me, it was money well spent. Don't know how much the Tony Mamo porting was worth, but I have to believe it was worth a significant part of the gain. Hats off to Shane and Stu from Thunder Racing for the beautiful install work and kudos to Geoff and Angie for the tuning help and support.
Kooks headers and catted y-pipe are next. Any predictions on gains?
Wednesday evening, we re-baselined my car. I was a little disappointed that it was down about 10 rwhp from when I last dynoed in April. Maybe the warm muggy August air had something to do with it being a little low. Regardless, the results of the Mamofied FAST 90/90 combination were ASTOUNDING. Check out this dyno:
That's a gain of around 27 rwhp! With stock exhaust manifolds and cats? The gains were incredible. Even at 2500 rpm, we were up around 10 rwtq. Peak torque increased 20. Everybody told me I was wasting my time adding a FAST 90/90 to a car running a 215 @ .050 cam. For me, it was money well spent. Don't know how much the Tony Mamo porting was worth, but I have to believe it was worth a significant part of the gain. Hats off to Shane and Stu from Thunder Racing for the beautiful install work and kudos to Geoff and Angie for the tuning help and support.
Kooks headers and catted y-pipe are next. Any predictions on gains?
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
08-05-2005, 11:27 AM
#6
SAE numbers. 1.01 correction on the 384 rwhp and 1.00 correction on the 411 rwhp.
As far as keeping the car stock with stock manifolds, I can always go back. But when my car makes 411 rwhp through the SLP dual dual catback and 410 rwhp through the cutout, it leads you to believe that the choke point of the exhaust is further upstream. Cutouts should gain something on a 400 horse motor, LOL.
Headers should alleviate the upstream choke point. Besides, I hate leaving power on the table. Since I'll be running cats and small cam, the car will still have supreme street manners...it will just sound a little more modified. Hey, somebody had to test all this to find out what was possible!
As far as keeping the car stock with stock manifolds, I can always go back. But when my car makes 411 rwhp through the SLP dual dual catback and 410 rwhp through the cutout, it leads you to believe that the choke point of the exhaust is further upstream. Cutouts should gain something on a 400 horse motor, LOL.
Headers should alleviate the upstream choke point. Besides, I hate leaving power on the table. Since I'll be running cats and small cam, the car will still have supreme street manners...it will just sound a little more modified. Hey, somebody had to test all this to find out what was possible!
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08-05-2005, 11:54 AM
#11
I can tell u the porting was worth doing Pat..I ported my LSX using a template made from paper that we transposed onto my heads..We then used that as a guide and when we were done the intake matched my heads perfectly...
I belive I gained a solid 16/16 from going from my LS6/PTB combo...Going by the 393 # that u orig. had it looks like the gain was about 18RW and even more since the weather killed some of your power..
U have me thinking that once I add the heads to my whimpy combo that if I could see 375RW threw the A4 that an LSX/90 might get me another 15+ improvement..I couldnt imagine a 214-222 cammed and headed A4 putting down 390RW threw shorties/stock cats and stock exhaust but like u I think I'm going to find out over the winter..
I love this testing your doing along with TR...
This is just great stuff...
Waiting to see the next result...
I belive I gained a solid 16/16 from going from my LS6/PTB combo...Going by the 393 # that u orig. had it looks like the gain was about 18RW and even more since the weather killed some of your power..
U have me thinking that once I add the heads to my whimpy combo that if I could see 375RW threw the A4 that an LSX/90 might get me another 15+ improvement..I couldnt imagine a 214-222 cammed and headed A4 putting down 390RW threw shorties/stock cats and stock exhaust but like u I think I'm going to find out over the winter..
I love this testing your doing along with TR...
This is just great stuff...
Waiting to see the next result...
08-05-2005, 12:20 PM
#15
Originally Posted by PREDATOR-Z
Why not try QTP's with HVC, (more $$) but I believe you could get 30rwhp with those.
08-05-2005, 01:14 PM
#18
Great to see some Real data!! Thank you. 
Nick Williams 90 mm TB significantly improved my part throttle response. I knew it and the FAST intake really improved my Hp/Tq but I didn't have a baseline dyno. Mine is a stock bottom end (flycut pistons) 239/251 cam, GMMP LS6 heads and LG headers.
Nick Williams 90 mm TB significantly improved my part throttle response. I knew it and the FAST intake really improved my Hp/Tq but I didn't have a baseline dyno. Mine is a stock bottom end (flycut pistons) 239/251 cam, GMMP LS6 heads and LG headers.
08-05-2005, 01:16 PM
#19
TECH Senior Member
Originally Posted by Patrick G
Those would definitely be the way to go if I was running an ORY, but it is my understanding that much of the gains of the HVM collector would be negated if I stuck a catalytic converter on the end of it, LOL. Maybe it's a myth.
But IMO 400+ cfm cats would not affect the scavenging ability of the collector.
Or
Kooks but with a catted X true duals over the axel.
