Down on total power...any thoughts?
Down on total power...any thoughts? Hi all.
I just got back from having my '05 GP GXP tuned in FL and adding a ported intake/TB combo (awesome improvement). My total numbers were abyssmal for what I have done, however, and I want to see if anyone has an input that might help me figure out for sure why. It was hot and humid as hell (see link)
https://ls1tech.com/forums/ls4-front...ted-tuned.html
My car is an '05 with 100k miles. I have a built trans from Century a higher stall converter (appx 3200-3400). Other mods are:
Intense fenderwell intake
Sillicone Intakes 45 degree smooth elbow
Magnaflow catback
Hogan 3" catted DP
Also, before we headed to the dyno, we added:
1.8:1 Scorpion roller rockers
7.4 comp cams hardened pushrods
LS6 yellow springs
MSD wires
NGK TR6 plugs
edit: I forgot that we de-screened the MAF before heading to the dyno.
My first pull with a a rough tune was 212whp and I think 200 wtq. WAY down from the 260 plus I was expecting. Again, the heat was tremendous but I still expected a good deal more power. I'm going to clean my MAF sensor today and see if that changes anything (I'll use my Dynolicious software for before and after testing.) Outside of that, I don't know what it could be. I know for a fact it isn't in the tune as Jeremy pulled every ounce of HP out of it that could be found. We thought the stall may be eating up a good bit of it, but I think there may be more. Any thoughts are appreciated.
I haven't run a compression test, but does anyone think that'd be necessary?
Thanks,
BJ
I just got back from having my '05 GP GXP tuned in FL and adding a ported intake/TB combo (awesome improvement). My total numbers were abyssmal for what I have done, however, and I want to see if anyone has an input that might help me figure out for sure why. It was hot and humid as hell (see link)
https://ls1tech.com/forums/ls4-front...ted-tuned.html
My car is an '05 with 100k miles. I have a built trans from Century a higher stall converter (appx 3200-3400). Other mods are:
Intense fenderwell intake
Sillicone Intakes 45 degree smooth elbow
Magnaflow catback
Hogan 3" catted DP
Also, before we headed to the dyno, we added:
1.8:1 Scorpion roller rockers
7.4 comp cams hardened pushrods
LS6 yellow springs
MSD wires
NGK TR6 plugs
edit: I forgot that we de-screened the MAF before heading to the dyno.
My first pull with a a rough tune was 212whp and I think 200 wtq. WAY down from the 260 plus I was expecting. Again, the heat was tremendous but I still expected a good deal more power. I'm going to clean my MAF sensor today and see if that changes anything (I'll use my Dynolicious software for before and after testing.) Outside of that, I don't know what it could be. I know for a fact it isn't in the tune as Jeremy pulled every ounce of HP out of it that could be found. We thought the stall may be eating up a good bit of it, but I think there may be more. Any thoughts are appreciated.
I haven't run a compression test, but does anyone think that'd be necessary?
Thanks,
BJ
Last edited by slomaro2; Sep 6, 2009 at 01:39 PM. Reason: amendment
We ran it in 2nd and 3rd and had just about the same results. The car really cooks now so I know it's faster, but it would roast the tires before the latest mods. I can't imagine that I only had 200 or so hp burning the tires through 2nd.
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dyno... There is a dyno 2 miles from my house and I agree that it would be a worthwhile investment.
I just made a couple of runs with the dynolicious on the IPOD touch and came up with an 1/8th mile run of 9.3 at 83 mph (with a horrible 2.6 sixty foot time--my car destroys the tires in the first two gears, even if I baby it or use the TC.) I'm not sure about how this thing rates power as it showed me between 277 and 291. I'm not sure if that shows power at the wheels or at the crank. Anybody know?
I just made a couple of runs with the dynolicious on the IPOD touch and came up with an 1/8th mile run of 9.3 at 83 mph (with a horrible 2.6 sixty foot time--my car destroys the tires in the first two gears, even if I baby it or use the TC.) I'm not sure about how this thing rates power as it showed me between 277 and 291. I'm not sure if that shows power at the wheels or at the crank. Anybody know?
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TECH Fanatic
Joined: May 2008
Posts: 1,769
Likes: 0
From: Fargo, ND
Yea talk with the people at the speed shops or find a cruise night, car club meeting, etc in the area on a forum or something. Maybe even going to the local drag strip on a street car night could be worthwhile time spent.
There is a dyno 2 miles from my house and I agree that it would be a worthwhile investment.
I just made a couple of runs with the dynolicious on the IPOD touch and came up with an 1/8th mile run of 9.3 at 83 mph (with a horrible 2.6 sixty foot time--my car destroys the tires in the first two gears, even if I baby it or use the TC.) I'm not sure about how this thing rates power as it showed me between 277 and 291. I'm not sure if that shows power at the wheels or at the crank. Anybody know?
I just made a couple of runs with the dynolicious on the IPOD touch and came up with an 1/8th mile run of 9.3 at 83 mph (with a horrible 2.6 sixty foot time--my car destroys the tires in the first two gears, even if I baby it or use the TC.) I'm not sure about how this thing rates power as it showed me between 277 and 291. I'm not sure if that shows power at the wheels or at the crank. Anybody know?
Go to a track and run it, then you will have a better idea of where you are at based on what most of these run in stock form or with a few mods. My car with the ported intake manifold, 1.8 rockers, ls6 valve springs, K&N intake, hogan DP, Magnaflow cat back, and a Diablo tuner ran 13.0 @ 107 on slicks. Around a 13. 3 without slicks.
Go to a track and run it, then you will have a better idea of where you are at based on what most of these run in stock form or with a few mods. My car with the ported intake manifold, 1.8 rockers, ls6 valve springs, K&N intake, hogan DP, Magnaflow cat back, and a Diablo tuner ran 13.0 @ 107 on slicks. Around a 13. 3 without slicks.
Take it to a track, your trap speed will tell the story.
Some free mods make you go backwards (any of you F-body LS1 guys remember what happened when you cut the EGR tube in the intake?) and this is definitely one of them.
I don't know, if you read the tread that JeremyF posted about before and after dyno results with port job. I think you may have the best car on this board. Any front wheel drive car that can get those hp increases to the rear wheels is awesome in my book.
But seriously, I highly recommend you get another dyno pull. I believe that any dyno operator that doesn't know that this car is rated as front wheel horse power not rwhp, my have set the dyno incorrectly. Maybe not on purpose but it happens when someone wants you to think you have much more power than you actually do or vs versa.
What ever route you go keep us posted. And may be the shop (Fasterproms is it??) will post showing the dyno set up. If he had it set up as rear wheel drive then he prolly would have had the drums spinning backwards depending on his set up.
But seriously, I highly recommend you get another dyno pull. I believe that any dyno operator that doesn't know that this car is rated as front wheel horse power not rwhp, my have set the dyno incorrectly. Maybe not on purpose but it happens when someone wants you to think you have much more power than you actually do or vs versa.
What ever route you go keep us posted. And may be the shop (Fasterproms is it??) will post showing the dyno set up. If he had it set up as rear wheel drive then he prolly would have had the drums spinning backwards depending on his set up.
Last edited by LS4SPEED; Sep 9, 2009 at 08:14 AM.
Teching In
Joined: Feb 2007
Posts: 35
Likes: 0
From: Kissimmee
I dont believe the dyno guy dyno'd your car correctly! I'm pretty sure (using the dyno-jet!!) that they didnt lock out your converter option. If they had any read-out issues from the beginning of the dyno, he probably just chosen to bypass lock-out. This alone will drop your power output reading because the dynojet requires lockout for any vehicle (esp. vehicles with non-lock-up converters) having a stall converter. Might want to get that double checked!!
Teching In
Joined: Feb 2007
Posts: 35
Likes: 0
From: Kissimmee
Not really!! Descreening the MAF is one of the worst things you can do with LS motor. I experimented with that on a couple of LS1s several years ago, and the result was always less, power, a lot of KR, and with it, less timing.
Some free mods make you go backwards (any of you F-body LS1 guys remember what happened when you cut the EGR tube in the intake?) and this is definitely one of them.
Some free mods make you go backwards (any of you F-body LS1 guys remember what happened when you cut the EGR tube in the intake?) and this is definitely one of them.
