New heads and cam under achieving?
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New heads and cam under achieving? 1st Thread I've posted but I really want imput. I have an 02 m6 with all the regular bolt on stuff. With lt's and stock tune the car laid down 343 RWHP and 365RWTQ. This I believe put the car in pretty good company with comprable cars I've seen here. I just laid down some serious coin and had a reputable local shop install a full on heads and cam combo. ETP 215's,.591/.601 230/236 114 lsa custom cam,yella terra rockers, new comp lifters,underdrive pully. My new numbers are 426RWHP and 400RWTQ. This is thru the stock ls6 intake and ported 78mm TB. Is this acceptable????? The dyno graph has the HP peaking out at 6000 rpm's, I figured that with this combo I would see the engine pull all the way up to 6500 or more. What's the problem? Too much cam?? Need more intake(fast 90)??? Wrong tune?? I'm used to Big block and nitrous w/carb, so I really need help! 
The LS6 is gonna be the choke point with those heads. However, on a 114 LSA (which I assume has 4 degrees of advance ground in) I wouldn't expect peak hp to be much higher. To me, it doesn't seem too far off if at all. Maybe others will chime in though...
Well I made 443.8RWHP w/ ported stock Ls6 heads and a 232/234 .5xx/.6xx on a 114 LSA, LS6 intake, ported TB, Hooker LT's, ORY, Borla w/ plate,ASP, 12 bolt w/ 4.11's, Nitrous ready steel driveshaft. IMO I'd say those numbers are extremely low. What bolt ons? Who tuned it?
Originally Posted by ArcticZ28
Where did it peak? His numbers are certainly low, but I think he's more concerned about what's causing it to peak where it does.
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Originally Posted by sickss228
Well I made 443.8RWHP w/ ported stock Ls6 heads and a 232/234 .5xx/.6xx on a 114 LSA, LS6 intake, ported TB, Hooker LT's, ORY, Borla w/ plate,ASP, 12 bolt w/ 4.11's, Nitrous ready steel driveshaft. IMO I'd say those numbers are extremely low. What bolt ons? Who tuned it?
Last edited by bensdad; Aug 6, 2006 at 09:52 AM. Reason: more info
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Those numbers are very much in line with where they should be. To get the numbers higher you'll need to get a FAST 90/90 (ported would be even better) and make sure your SCR and DCR are high enough.
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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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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Originally Posted by Patrick G
Those numbers are very much in line with where they should be. To get the numbers higher you'll need to get a FAST 90/90 (ported would be even better) and make sure your SCR and DCR are high enough.
what cc are your heads ? you will probably need an scr of 11:5 or so to get your dcr up there but with that cam you should peak higher than 6000,probably 6500 or so.is the cam installed straight up ?
Still seems a little low to me. What Dyno? Mustang or dynojet? U didn't list pullies, you'd probably pick up about 10 more with pullies. You aren't that far off really. Might be more in the tune.
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Originally Posted by Blue Meanie
Still seems a little low to me. What Dyno? Mustang or dynojet? U didn't list pullies, you'd probably pick up about 10 more with pullies. You aren't that far off really. Might be more in the tune.
Are the ETP's out of the box or ported? It really should be making more power over 6K. My cam is very similar and the car was continuing to make power past 6800 where we set the limiter to protect the motor. If all other things eliminated, I would look at the Tune, then the heads. What were the flow numbers on your heads? I have heard weird things like people using valve springs way to stiff for a hydraulic roller cam that hurt power, but that is beyond my knowledge to advise you. Your power levels are pretty good, its where you are making it with that cam that I question.
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The ET heads are custom ported by ET Performance (ET). Flow # are 323cfm intake @.650 and 214cfm exhaust also @ .650 with at least 300+ cfm at .500 lift. The springs came with the heads and I verified the pressures with the cam grinder. These heads are supposed to be the best(ls1) heads money can buy.
I made an additional 10/-4 (vs. my LS6 and 78mm TB) with the fast 90/LS2 combo so the numbers you are providing are in line. I am running a very mild cam and put down similar numbers. Your numbers are not out of line but something isn't working well together. Best of Luck!
J.R.
J.R.
Sounds ok to me I hit 420 hp/356 tq after a tune at ECS.
Mod's are Dynamaxx headers, LS6 intake, polished throttle body, u/d pulley, ls6 heads, MTI R1 (232/236 .575/587 / 114), LS7 clutch and 4:10's.
Nice idle and pulls like a banshee above 3.5K.
Bob K.
Mod's are Dynamaxx headers, LS6 intake, polished throttle body, u/d pulley, ls6 heads, MTI R1 (232/236 .575/587 / 114), LS7 clutch and 4:10's.
Nice idle and pulls like a banshee above 3.5K.
Bob K.
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Originally Posted by Ksett
It seems like all the ETP head dyno graphs I've seen so far have peaked around 6300 and then fallen off. When yours peaks at 6000 does the power fall off as well?