Tuned on a Mustang Dyno, later dynod on a Dynojet... Is something wrong?
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Tuned on a Mustang Dyno, later dynod on a Dynojet... Is something wrong?
So the story of this car: I had a 97 with an LS1 swap. Had a Patriot 225/229 .580/.590 114+4, PAC 1218 .600" lift valve springs, longtube headers into a 3" cutout. It was tuned on a Mustang Dyno and put down 359hp/346ftlb. The car was totalled due to an old lady running a red light the day after it was tuned. I then bought my SOM car. Transferred the cam, valve springs, and PCM. The tune has not been updated in the new car at all.
Mustang Dyno graph May 2009:
I have since done a few things to the SOM car. Ported throttle body, Monster Stage 2 clutch with lightweight flywheel, full 3" true duals with x-pipe. 10.5" OEWheels C5 DD replica rear wheels with a 315/35/18 Toyo drag radial. Has not been retuned since the PCM was in my old 97.
Was at Vengeance Racing for FBody Gathering cruisein and had my car dynoed. Best it rounded up was 367hp/360ftlb. I've always been told Dynojets read much higher, so it kinda got me worried if there would be something wrong with me car. Especially since it flattens at about 5500rpm. The valve springs have maybe 15k-20k miles on them, but even when fresh the first dyno flattened at around 5500, but actually made peak power just under 6200. Also on the first graph, the HP curve is still flat around 6200, where as it's already dropping on the 2nd graph. It was hot as hell in there with no cooldown, fans or anything.. What could be the deal?
Also I went to a local 1/8th mile drag strip a few nights after. I only got ONE pass it, before they closed, I got there late, so figured what the hell. I baby launched it and trapped a 9.004 @ 84mph in the 1/8. I think 85 or 86 is easily possible, I shifted early and didn't launch hard. My first time at a track with this car ever actually
Dynojet graph May 2011:
And a video of the 3 dynos.
http://www.youtube.com/watch?v=hQeTG...eature=related
Mustang Dyno graph May 2009:
I have since done a few things to the SOM car. Ported throttle body, Monster Stage 2 clutch with lightweight flywheel, full 3" true duals with x-pipe. 10.5" OEWheels C5 DD replica rear wheels with a 315/35/18 Toyo drag radial. Has not been retuned since the PCM was in my old 97.
Was at Vengeance Racing for FBody Gathering cruisein and had my car dynoed. Best it rounded up was 367hp/360ftlb. I've always been told Dynojets read much higher, so it kinda got me worried if there would be something wrong with me car. Especially since it flattens at about 5500rpm. The valve springs have maybe 15k-20k miles on them, but even when fresh the first dyno flattened at around 5500, but actually made peak power just under 6200. Also on the first graph, the HP curve is still flat around 6200, where as it's already dropping on the 2nd graph. It was hot as hell in there with no cooldown, fans or anything.. What could be the deal?
Also I went to a local 1/8th mile drag strip a few nights after. I only got ONE pass it, before they closed, I got there late, so figured what the hell. I baby launched it and trapped a 9.004 @ 84mph in the 1/8. I think 85 or 86 is easily possible, I shifted early and didn't launch hard. My first time at a track with this car ever actually
Dynojet graph May 2011:
And a video of the 3 dynos.
http://www.youtube.com/watch?v=hQeTG...eature=related
Last edited by HoLLo; 06-12-2011 at 06:46 PM.
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It was tuned at shop in TN 2 years ago on that PCM. I'm actually running a 2000 PCM that was in my old 97... But IMO, the guy could have spent more time refining the tune.. :/
Don't think i'll worry about a new tune until I get some heads. But I'm thinking maybe I'm getting valve float or something because look at 6500rpms on both graphs. Drastic difference.
Don't think i'll worry about a new tune until I get some heads. But I'm thinking maybe I'm getting valve float or something because look at 6500rpms on both graphs. Drastic difference.
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It was tuned at shop in TN 2 years ago on that PCM. I'm actually running a 2000 PCM that was in my old 97... But IMO, the guy could have spent more time refining the tune.. :/
Don't think i'll worry about a new tune until I get some heads. But I'm thinking maybe I'm getting valve float or something because look at 6500rpms on both graphs. Drastic difference.
Don't think i'll worry about a new tune until I get some heads. But I'm thinking maybe I'm getting valve float or something because look at 6500rpms on both graphs. Drastic difference.
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its in your tune man, valve float would be a drastic loss up top.
now maybe someone can chime in but isnt your waving erractic powerband up around 5200-6500 means the timings off? that being as long as the heads havent been home ported or anything.
now maybe someone can chime in but isnt your waving erractic powerband up around 5200-6500 means the timings off? that being as long as the heads havent been home ported or anything.
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#9
Not having an LS6 intake isn't helping but I would bet the cam just isn't up to snuff.
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I have an 01. Came with ls6 intake factory, I assumed that was common knowledge so I left it out. I have seen this cam make power above 6000 before. Patriot claims it makes power to 6200 on a stock head ls1..
Do not have a current number on me.. ill pm them to you later
Do not have a current number on me.. ill pm them to you later
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Looks like the AFR is a little lean. Id shoot for 12.2-12.5 range and the fact that there were no fans helping get cooler air going. Maybe you have some KR and timing being pulled due to the lean factor and hot air. Do you know how much timing it had during the pull? How about IAT's?
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Looks like the AFR is a little lean. Id shoot for 12.2-12.5 range and the fact that there were no fans helping get cooler air going. Maybe you have some KR and timing being pulled due to the lean factor and hot air. Do you know how much timing it had during the pull? How about IAT's?
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So the story of this car: I had a 97 with an LS1 swap. Had a Patriot 225/229 .580/.590 114+4, PAC 1218 .600" lift valve springs, longtube headers into a 3" cutout. It was tuned on a Mustang Dyno and put down 359hp/346ftlb. The car was totalled due to an old lady running a red light the day after it was tuned. I then bought my SOM car. Transferred the cam, valve springs, and PCM. The tune has not been updated in the new car at all.
Mustang Dyno graph May 2009:
I have since done a few things to the SOM car. Ported throttle body, Monster Stage 2 clutch with lightweight flywheel, full 3" true duals with x-pipe. 10.5" OEWheels C5 DD replica rear wheels with a 315/35/18 Toyo drag radial. Has not been retuned since the PCM was in my old 97.
Was at Vengeance Racing for FBody Gathering cruisein and had my car dynoed. Best it rounded up was 367hp/360ftlb. I've always been told Dynojets read much higher, so it kinda got me worried if there would be something wrong with me car. Especially since it flattens at about 5500rpm. The valve springs have maybe 15k-20k miles on them, but even when fresh the first dyno flattened at around 5500, but actually made peak power just under 6200. Also on the first graph, the HP curve is still flat around 6200, where as it's already dropping on the 2nd graph. It was hot as hell in there with no cooldown, fans or anything.. What could be the deal?
Also I went to a local 1/8th mile drag strip a few nights after. I only got ONE pass it, before they closed, I got there late, so figured what the hell. I baby launched it and trapped a 9.004 @ 84mph in the 1/8. I think 85 or 86 is easily possible, I shifted early and didn't launch hard. My first time at a track with this car ever actually
Dynojet graph May 2011:
And a video of the 3 dynos.
http://www.youtube.com/watch?v=hQeTG...eature=related
Mustang Dyno graph May 2009:
I have since done a few things to the SOM car. Ported throttle body, Monster Stage 2 clutch with lightweight flywheel, full 3" true duals with x-pipe. 10.5" OEWheels C5 DD replica rear wheels with a 315/35/18 Toyo drag radial. Has not been retuned since the PCM was in my old 97.
Was at Vengeance Racing for FBody Gathering cruisein and had my car dynoed. Best it rounded up was 367hp/360ftlb. I've always been told Dynojets read much higher, so it kinda got me worried if there would be something wrong with me car. Especially since it flattens at about 5500rpm. The valve springs have maybe 15k-20k miles on them, but even when fresh the first dyno flattened at around 5500, but actually made peak power just under 6200. Also on the first graph, the HP curve is still flat around 6200, where as it's already dropping on the 2nd graph. It was hot as hell in there with no cooldown, fans or anything.. What could be the deal?
Also I went to a local 1/8th mile drag strip a few nights after. I only got ONE pass it, before they closed, I got there late, so figured what the hell. I baby launched it and trapped a 9.004 @ 84mph in the 1/8. I think 85 or 86 is easily possible, I shifted early and didn't launch hard. My first time at a track with this car ever actually
Dynojet graph May 2011:
And a video of the 3 dynos.
http://www.youtube.com/watch?v=hQeTG...eature=related
Thats 1 fine *** car!!
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With the cam being a .580/.590 lift and my PAC 1218 single beehive valve springs rated to .600 lift, with almost 20k miles on it, it probably have some valve float huh?