Low numbers.....need help!
09-25-2007, 06:32 PM
#1
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Low numbers.....need help! Just got my car dynoed after the cam install and was disappointed with the numbers it put down. Sorry, I don't have any numbers before the cam install. It was tuned on a Dynojet with 26*degrees total timing and 12.7:1 A/F. It's a cam-only '99 M6 Camaro LS1 with most all the bolt-ons:
-I still have the LS1 intake
-LT headers, 3" true duals with Xpipe w/ sweet thunders, no cats
-MTI lid with K&N, smooth bellows, Granatelli mass air
-LS7 clutch, ported LS6 oil pump, LS2 timing chain
-hardened Comp 7.450” pushrods/ stock rockers/lifters
-Patriot Dual springs kit
Cam Specs
Comp Cams XFI/XE-R lobes
Dur @.050 231.5/230.8
Lift .617"/.593"
LSA 110.7
The motor runs really strong...no missing, no smoking.....just don't understand why the numbers were so low
what are your thoughts?
-I still have the LS1 intake
-LT headers, 3" true duals with Xpipe w/ sweet thunders, no cats
-MTI lid with K&N, smooth bellows, Granatelli mass air
-LS7 clutch, ported LS6 oil pump, LS2 timing chain
-hardened Comp 7.450” pushrods/ stock rockers/lifters
-Patriot Dual springs kit
Cam Specs
Comp Cams XFI/XE-R lobes
Dur @.050 231.5/230.8
Lift .617"/.593"
LSA 110.7
The motor runs really strong...no missing, no smoking.....just don't understand why the numbers were so low
what are your thoughts? 
09-25-2007, 09:21 PM
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waSStock-
The guy who tuned it mentioned that he normally sets the total timing to 28* on most of the LS1's he tunes, but he said for some reason mine didn't like it at 28, he said it was knocking during mid-range and lost power so he had to back it off to 26 degrees total timing, he didn't seem to know why....
Slowhawk-
Sorry, I don't have a dyno# before the cam
The guy who tuned it mentioned that he normally sets the total timing to 28* on most of the LS1's he tunes, but he said for some reason mine didn't like it at 28, he said it was knocking during mid-range and lost power so he had to back it off to 26 degrees total timing, he didn't seem to know why....
Slowhawk-
Sorry, I don't have a dyno# before the cam
09-26-2007, 08:11 AM
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Originally Posted by waSStock
What plugs are you running? Are you still runnung the stock PCV system?
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09-26-2007, 09:59 AM
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Originally Posted by Jefro6996
swap the intake for a used ls6 intake. you should be able to find one used on the forum for under $350. Still a little low though.
09-26-2007, 11:16 AM
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Nate, do a leakdown on the engine to see if it is healthy and go from there. I suspect some oil consumption due to the decrease in timing I was able to run.
BTW, I tuned nates car. Numbers are below average for what he has.
BTW, I tuned nates car. Numbers are below average for what he has.
09-26-2007, 11:27 AM
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Originally Posted by mikey
Nate, do a leakdown on the engine to see if it is healthy and go from there. I suspect some oil consumption due to the decrease in timing I was able to run.
BTW, I tuned nates car. Numbers are below average for what he has.
BTW, I tuned nates car. Numbers are below average for what he has.
09-26-2007, 05:07 PM
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Originally Posted by John02Hawk
Have you cleaned your maf or air filter lately? Have you replaced your fuel filter before?
09-26-2007, 05:34 PM
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Originally Posted by mikey
Nate, do a leakdown on the engine to see if it is healthy and go from there. I suspect some oil consumption due to the decrease in timing I was able to run.
BTW, I tuned nates car. Numbers are below average for what he has.
BTW, I tuned nates car. Numbers are below average for what he has.
09-26-2007, 07:47 PM
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Originally Posted by waSStock
+1 on the oil issue. The stock PCV system is known for allowing oil to enter the intake tract. This will typically show up as detonation for a number of reasons. Eliminate any oil entering the intake, clean the top end, perform the leak down and then pay your tuner another visit.
09-26-2007, 11:13 PM
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Originally Posted by mikey
Nate, do a leakdown on the engine to see if it is healthy and go from there. I suspect some oil consumption due to the decrease in timing I was able to run.
BTW, I tuned nates car. Numbers are below average for what he has.
BTW, I tuned nates car. Numbers are below average for what he has.
09-27-2007, 07:47 AM
#17
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www.hovis.cc/Firebird_HTML/pcv_mod.htm
I've been running this set up for years. Works great. There are other options using seperator cans and what not, but this has been flawless for me.
I've been running this set up for years. Works great. There are other options using seperator cans and what not, but this has been flawless for me.
09-27-2007, 08:47 AM
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i would delete the pcv and just run a breather and connect the two valve covers in the rear. i agree the ls6 is only worth 10-15 to the wheels, but with that added it would have some closer to average numbers. So it could put him at 375-380rwhp which isnt that bad for a cam only car and if he fixes the issues with timing could be 385-390rwhp.
09-27-2007, 03:40 PM
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Originally Posted by Jefro6996
i would delete the pcv and just run a breather and connect the two valve covers in the rear. i agree the ls6 is only worth 10-15 to the wheels, but with that added it would have some closer to average numbers. So it could put him at 375-380rwhp which isnt that bad for a cam only car and if he fixes the issues with timing could be 385-390rwhp.
09-28-2007, 10:24 AM
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Originally Posted by EarlSS
I agree... with an ls6 intake he'd be alot closer to the average. An ud pulley and a ported throttle body combined the ls6 should put him right with all the other cam only cars. Plus we gotta remember all dynos read a little different.