Need dyno expert to interpret my dyno puzzle
10-29-2004, 10:23 PM
#1
Need dyno expert to interpret my dyno puzzle
All the pulls below were performed on same dynojet on different days:
dyno results day one, hot day this summer with popcharger, pulley, kinetix hf cats: hp=235, tq=226, a/f=14
dyno results 2 days later with stock intake, pulley, stock cats: hp=242, tq=239, a/f=13.2.
dynojet results this past thursday, rainy and cold outside:
with popcharger, pulley, stock cats, stock ypipe: hp=235, tq=230, a/f=stoich
with popcharger, pulley, stock cats, hf ypipe: hp=241, tq=235, a/f=stoich
with popcharger, pulley, replacement set of kinetix hf cats, hf ypipe: hp=242, tq=231, a/f=stoich
dynojet results next day, colder outside:
with stock intake, pulley, hf cats, hf ypipe: hp=242, tq=234, a/f=stoich
From the above results, i can conclude with certainty, i think: replacement kinetix hf cats added only 1 hp; unlimited's hf ypipe added 6hp; its a goddam shame that all these expensive mods yield so freakin little gains!!! Finally, my Z appears to be factory tuned right at the sweet spot and is an unyielding little *****!!!
Much less certain can i be about popcharger's influence; has anyone actually lost hp with a jwt popcharger???
All input/interpretations/opinions welcomed.
dyno results day one, hot day this summer with popcharger, pulley, kinetix hf cats: hp=235, tq=226, a/f=14
dyno results 2 days later with stock intake, pulley, stock cats: hp=242, tq=239, a/f=13.2.
dynojet results this past thursday, rainy and cold outside:
with popcharger, pulley, stock cats, stock ypipe: hp=235, tq=230, a/f=stoich
with popcharger, pulley, stock cats, hf ypipe: hp=241, tq=235, a/f=stoich
with popcharger, pulley, replacement set of kinetix hf cats, hf ypipe: hp=242, tq=231, a/f=stoich
dynojet results next day, colder outside:
with stock intake, pulley, hf cats, hf ypipe: hp=242, tq=234, a/f=stoich
From the above results, i can conclude with certainty, i think: replacement kinetix hf cats added only 1 hp; unlimited's hf ypipe added 6hp; its a goddam shame that all these expensive mods yield so freakin little gains!!! Finally, my Z appears to be factory tuned right at the sweet spot and is an unyielding little *****!!!
Much less certain can i be about popcharger's influence; has anyone actually lost hp with a jwt popcharger???
All input/interpretations/opinions welcomed.
Last edited by Z BOY; 10-29-2004 at 10:30 PM.
10-30-2004, 12:25 AM
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Re: Need dyno expert to interpret my dyno puzzle
Originally posted by Z BOY
All the pulls below were performed on same dynojet on different days:
dyno results day one, hot day this summer with popcharger, pulley, kinetix hf cats: hp=235, tq=226, a/f=14
dyno results 2 days later with stock intake, pulley, stock cats: hp=242, tq=239, a/f=13.2.
dynojet results this past thursday, rainy and cold outside:
with popcharger, pulley, stock cats, stock ypipe: hp=235, tq=230, a/f=stoich
with popcharger, pulley, stock cats, hf ypipe: hp=241, tq=235, a/f=stoich
with popcharger, pulley, replacement set of kinetix hf cats, hf ypipe: hp=242, tq=231, a/f=stoich
dynojet results next day, colder outside:
with stock intake, pulley, hf cats, hf ypipe: hp=242, tq=234, a/f=stoich
From the above results, i can conclude with certainty, i think: replacement kinetix hf cats added only 1 hp; unlimited's hf ypipe added 6hp; its a goddam shame that all these expensive mods yield so freakin little gains!!! Finally, my Z appears to be factory tuned right at the sweet spot and is an unyielding little *****!!!
Much less certain can i be about popcharger's influence; has anyone actually lost hp with a jwt popcharger???
All input/interpretations/opinions welcomed.
All the pulls below were performed on same dynojet on different days:
dyno results day one, hot day this summer with popcharger, pulley, kinetix hf cats: hp=235, tq=226, a/f=14
dyno results 2 days later with stock intake, pulley, stock cats: hp=242, tq=239, a/f=13.2.
dynojet results this past thursday, rainy and cold outside:
with popcharger, pulley, stock cats, stock ypipe: hp=235, tq=230, a/f=stoich
with popcharger, pulley, stock cats, hf ypipe: hp=241, tq=235, a/f=stoich
with popcharger, pulley, replacement set of kinetix hf cats, hf ypipe: hp=242, tq=231, a/f=stoich
dynojet results next day, colder outside:
with stock intake, pulley, hf cats, hf ypipe: hp=242, tq=234, a/f=stoich
From the above results, i can conclude with certainty, i think: replacement kinetix hf cats added only 1 hp; unlimited's hf ypipe added 6hp; its a goddam shame that all these expensive mods yield so freakin little gains!!! Finally, my Z appears to be factory tuned right at the sweet spot and is an unyielding little *****!!!
Much less certain can i be about popcharger's influence; has anyone actually lost hp with a jwt popcharger???
All input/interpretations/opinions welcomed.
10-30-2004, 06:47 AM
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Re: Re: Need dyno expert to interpret my dyno puzzle
The dyno graphs would really help--with torque, hp and the A/F.
Also, keep in mind that the stock ECU needs some driving time to adapt to changes in airflow. That might take 100 miles or so to adapt (just my experience).
Also, keep in mind that the stock ECU needs some driving time to adapt to changes in airflow. That might take 100 miles or so to adapt (just my experience).
10-30-2004, 07:42 AM
#4
Re: Re: Re: Need dyno expert to interpret my dyno puzzle
Originally posted by jjellyneck
The dyno graphs would really help--with torque, hp and the A/F.
Also, keep in mind that the stock ECU needs some driving time to adapt to changes in airflow. That might take 100 miles or so to adapt (just my experience).
The dyno graphs would really help--with torque, hp and the A/F.
Also, keep in mind that the stock ECU needs some driving time to adapt to changes in airflow. That might take 100 miles or so to adapt (just my experience).
10-30-2004, 08:15 PM
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Are those numbers SAE corrected? And at what RPM are you getting those numbers.
It may be helpful if you impose all of those dyno runs on one chart and make sure the correction factor is set to SAE. Then I would compare the tq curves.
Michael.
It may be helpful if you impose all of those dyno runs on one chart and make sure the correction factor is set to SAE. Then I would compare the tq curves.
Michael.
10-30-2004, 08:17 PM
#7
Re: Re: Re: Need dyno expert to interpret my dyno puzzle
Originally posted by jjellyneck
The dyno graphs would really help--with torque, hp and the A/F.
Also, keep in mind that the stock ECU needs some driving time to adapt to changes in airflow. That might take 100 miles or so to adapt (just my experience).
The dyno graphs would really help--with torque, hp and the A/F.
Also, keep in mind that the stock ECU needs some driving time to adapt to changes in airflow. That might take 100 miles or so to adapt (just my experience).
.008 is popcharger and unlimited ypipe.
.009 and .010 are popcharger, unlimited ypipe and kinetix h/f cats.
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10-30-2004, 09:11 PM
#9
Originally posted by Michael-Dallas
Are those numbers SAE corrected? And at what RPM are you getting those numbers.
It may be helpful if you impose all of those dyno runs on one chart and make sure the correction factor is set to SAE. Then I would compare the tq curves.
Michael.
Are those numbers SAE corrected? And at what RPM are you getting those numbers.
It may be helpful if you impose all of those dyno runs on one chart and make sure the correction factor is set to SAE. Then I would compare the tq curves.
Michael.
10-31-2004, 07:39 AM
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Just goes to show you where the real bottle necks on this car are from the factory. The y-pipe is one, the plenum another and the exhaust manifolds the biggest. The ecu will definately make a difference if you advance the timing, but I would wait until you have replaced at least the plenum. The y-pipe, plenum and headers really allow the car to take advantage of other mods.
11-02-2004, 07:08 AM
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I knew the stock cats were already high flow, and that the y-pipe is the bottleneck. This proves it. I went with test pipes.
Also from experience pulley gains never show on the dyno, they are "real world" track proven. Meaning they usually shave about a tenth in the 1/4 mile which would be 7-10 rwhp on our cars.
I never liked the popcharger, I thought it was more of a RICE mod.
Also from experience pulley gains never show on the dyno, they are "real world" track proven. Meaning they usually shave about a tenth in the 1/4 mile which would be 7-10 rwhp on our cars.
I never liked the popcharger, I thought it was more of a RICE mod.
11-02-2004, 07:51 AM
#20
Originally posted by FairladyZ
I never liked the popcharger, I thought it was more of a RICE mod.
I never liked the popcharger, I thought it was more of a RICE mod.
And you list Mobil 1 as an engine mod...My pop-charger made 11whp over my AEM--in combination with my other mods. To the guy with the dyno issues, put your pop-charger back on if you want, but definetely get your ECU tuned, did good for me.
Last edited by Alberto; 11-02-2004 at 07:56 AM.