Just updated the top end on my LS2 427
02-01-2009, 10:08 PM
#1
Just updated the top end on my LS2 427 LS2 BASED 427 swapped out my PRC 2.5 HEADS, FAST 90 AND 248/254 .601/.610 114+4 CAM ( MADE 507 RWHP) for
TSP LS7 Heads w/ new TSP .700 lift spring kit, Ragin Racin ported LS7 intake, New Rectangular port specific Comp LSL lobe 251/267 .660 115 cam
Made 570 rwhp
Peak was only up 62 but @ 7200 rpm's im up ~ 100 rwhp & 70 rwtq
Found 2 issues during/after the dyno runs:
1. I Realized after the pulls that my twin cutouts were only open ~ 25% , Switch went bad and I wasn't in the car so didn't notice the sound difference. Dyno room is like an echo chamber so from out side its hard to tell. I run a stock TI exhaust and with the old setup I gained 38RWHP closed vs 100% open. Will know tomorrow how much 25% - 100% is worth on the new setup.
2. Running out of air, KPA was dropping from 100 to 95, removed filter from Vararam and drop was reduced to 97 - Going to Look @ MAF / Air intake options options after a few runs with the cutouts fixed on Monday.
Cutouts are now fixed and waiting to determine best big MAF route after a few more pulls w/ cutouts 100% open. Curious if the exhaust was limiting flow and causing any of the MAP sensor drop.
TSP LS7 Heads w/ new TSP .700 lift spring kit, Ragin Racin ported LS7 intake, New Rectangular port specific Comp LSL lobe 251/267 .660 115 cam
Made 570 rwhp
Peak was only up 62 but @ 7200 rpm's im up ~ 100 rwhp & 70 rwtq
Found 2 issues during/after the dyno runs:
1. I Realized after the pulls that my twin cutouts were only open ~ 25% , Switch went bad and I wasn't in the car so didn't notice the sound difference. Dyno room is like an echo chamber so from out side its hard to tell. I run a stock TI exhaust and with the old setup I gained 38RWHP closed vs 100% open. Will know tomorrow how much 25% - 100% is worth on the new setup.
2. Running out of air, KPA was dropping from 100 to 95, removed filter from Vararam and drop was reduced to 97 - Going to Look @ MAF / Air intake options options after a few runs with the cutouts fixed on Monday.
Cutouts are now fixed and waiting to determine best big MAF route after a few more pulls w/ cutouts 100% open. Curious if the exhaust was limiting flow and causing any of the MAP sensor drop.
02-01-2009, 10:11 PM
#2
Nice gains. Post up the graphs when you get a chance. I'd love to see your power in the mid-range.
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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.
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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.
02-01-2009, 10:24 PM
#3
BTW - I sent you an PM a few months back to talk about the cam but I couldn't catch-up with you. I thought maybe you didn't remember me from the early days with our pal Mike Senia. Each of us testing 3 different converters a month. When I was working with Dave Inall developing the F body Twin Turbo kit on my old car "Fast Orange", Hell over 8 years ago now.
FYI - Mid range is a little soft but I race on the skreet mostly and the car weighs ~3050 so i didn't need/want a lot of mid range torque. I run 4.10 gears, so I leave easy, hit it, stick it in 2nd and I stay @ 5500+ from there on.
02-02-2009, 11:35 AM
#5
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Sounds like your topend got a major boost. When you have everything done could you post an overlay of your old setup vs the new one so everyone can get a good look at what your new setup does in comparison to the old one ?? Nice results bro. I hope you crack the 600 rwhp level with the 100 mm MAF. Best of luck.
02-02-2009, 11:56 AM
#6
Nice numbers! Let's see a graph when you get a chance! 
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02-02-2009, 06:03 PM
#8
03 Busa,
The LS6 heads w/ the prc 2.5 port and valve job were a restriction before + the fast 90 wasn't ported and no UD pulley. I'm sure that caused the old numbers too be a little lower which in turn makes the changes look even greater especially @ the higher RPM's.
****update****
Cut outs open to 100% made zero difference. I guess the extra opening just makes it louder.
Deciding now on whether or not to do the 100mm Maf or just leave it alone @ 570RWHP
The LS6 heads w/ the prc 2.5 port and valve job were a restriction before + the fast 90 wasn't ported and no UD pulley. I'm sure that caused the old numbers too be a little lower which in turn makes the changes look even greater especially @ the higher RPM's.
****update****
Cut outs open to 100% made zero difference. I guess the extra opening just makes it louder.
Deciding now on whether or not to do the 100mm Maf or just leave it alone @ 570RWHP
02-02-2009, 07:25 PM
#9
On your 427 cube LS2 I am guessing this motor wouldn't handle much spray because of the piston deck having to be so thin right? I am wanting to possibly build either a 427 or 454 but I would lke to be able to spray it and TSP says some of their motors the pistons get to thin for the added temp of spray.
02-02-2009, 10:22 PM
#11
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On your 427 cube LS2 I am guessing this motor wouldn't handle much spray because of the piston deck having to be so thin right? I am wanting to possibly build either a 427 or 454 but I would lke to be able to spray it and TSP says some of their motors the pistons get to thin for the added temp of spray.
Matt
02-03-2009, 09:51 PM
#12
shyhighsami,
I cant speak for your engine but my setup had a 200 shot on it sometime ago and everything was fine but that doesnt mean that yours will????
If TSP built your engine I would listen to what they say. They may have put it together with a total NA application in mind and there can be different parts spec'd , anyway if they built it they should know.......
I cant speak for your engine but my setup had a 200 shot on it sometime ago and everything was fine but that doesnt mean that yours will????
If TSP built your engine I would listen to what they say. They may have put it together with a total NA application in mind and there can be different parts spec'd , anyway if they built it they should know.......
