INSTALLED PSI 480 ECU !!
#31
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Originally Posted by MarcMF
There is no conversion factor with the MAHA dyno.
It measures the transaxle losses on deceleration !![Cool](https://rennlist.com/forums/images/smilies/cool.gif)
It measures the transaxle losses on deceleration !
![Cool](https://rennlist.com/forums/images/smilies/cool.gif)
There has to be an algorithm in the computer that compares wheel power to the resistance during spin-down or it wouldn't be able to compute flywheel power.
#33
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Originally Posted by Dock
So the MAHA will not give a reading of all-wheel (or rear wheel if it's not an AWD dyno) horsepower *and* flywheel horsepower? It only presents the flywheel power?
There has to be an algorithm in the computer that compares wheel power to the resistance during spin-down or it wouldn't be able to compute flywheel power.
There has to be an algorithm in the computer that compares wheel power to the resistance during spin-down or it wouldn't be able to compute flywheel power.
For example :
Measured wheel hp at 6000 rpm = 400 hp
Measured wheel hp at 3000 rpm = 150 hp
The moment that you'll hit the required top rpm ( say 7000 rpm) on the dyno you'll get out of gear and let the car decelerate in neutral to almost idle rpm . The dyno will measure this resistance .
Measured transaxle loss at 6000 rpm = 75 hp
Measured transaxle loss at 3000 rpm = 30 hp
Flywheel hp = wheel hp + transaxle/tire loss ( hp )
Flywheel hp at 6000 rpm = 475 hp
Flywheel hp at 3000 rpm = 180 hp
#34
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Originally Posted by MarcMF
Measured wheel hp at 6000 rpm = 400 hp...Measured transaxle loss at 6000 rpm = 75 hp
BTW, is the MAHA an AWD dyno?
#35
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Originally Posted by Dock
Well then it's easy to see that the correction in this case was 18.75%.
BTW, is the MAHA an AWD dyno?
BTW, is the MAHA an AWD dyno?
The Bosch and MAHA dynos are the ones that measure transaxle losses instead of using a fixed correction factor.
http://www.maha.de
#36
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Originally Posted by MarcMF
There is a 2WD and a AWD version.
The Bosch and MAHA dynos are the ones that measure transaxle losses instead of using a fixed correction factor.
The Bosch and MAHA dynos are the ones that measure transaxle losses instead of using a fixed correction factor.
I'm interested in knowing how the MAHA computes spin down resistance when all four wheels are being measured on an AWD dyno.
#37
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Originally Posted by MarcMF
The PSI 480 H.P. chip is $ 4000.00
#39
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I'm interested in knowing how the MAHA computes spin down resistance when all four wheels are being measured on an AWD dyno.[/QUOTE]
Must be the same type of measurement as on an acceleration run but then reversed.
Must be the same type of measurement as on an acceleration run but then reversed.
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#40
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FYI - FVD is offering the 996tt DME and software upgrade on sale this month (until Oct.30) for $2,150.00...no affiliation just a heads up for anyone interested.
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991.2 GT3 RS Weissach Racing Yellow
991.2 Turbo S GT Silver
991.2 GT3 Chalk (Manual)
2022 Cayenne White
former 1972 911T white, 1984 911 3.2 Targa black, 993 cab white, 993TT arena red, 993TT silver, 996TT speed yellow, 991.1 GT3 white
www.speedtechexhausts.com
info@speedtechexhausts.com
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#41
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Software and BMC air filter is $3200 from Orton
(I do not know what 969 price is).
I put on about 600 miles this weekend in Central Wisconsin after my
new plugs were installed and I am completely satisfied with the PSI
software. Loads of torque (pulls like a big V-8) and no CEL's, no misses.
Runs perfect! Just letting you guys know there are alternatives to GIAC,
and I think the numbers that PSI, FVD and Cargraphic post are more realistic
than Upsolute and GIAC. C'mon almost 100 Horsepower from a "chip"????
Would be best to do some fun runs side by side...
Cheers.
MK
(I do not know what 969 price is).
I put on about 600 miles this weekend in Central Wisconsin after my
new plugs were installed and I am completely satisfied with the PSI
software. Loads of torque (pulls like a big V-8) and no CEL's, no misses.
Runs perfect! Just letting you guys know there are alternatives to GIAC,
and I think the numbers that PSI, FVD and Cargraphic post are more realistic
than Upsolute and GIAC. C'mon almost 100 Horsepower from a "chip"????
Would be best to do some fun runs side by side...
Cheers.
MK
#42
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Marty,
None of the GIAC dealers that I know will quote 100HP from a chip. That is a bit inflated. I know we sure as heck don't. We have proven on the dyno what the numbers are and have posted them. Few still have yet to post real dynos. I think for 1995.00 I would be willing to put our chip up against anything. Lets do some 60-130 measurements and see where the cards lay. But please keep in mind we do not say it is worth 100 for just a chip.
None of the GIAC dealers that I know will quote 100HP from a chip. That is a bit inflated. I know we sure as heck don't. We have proven on the dyno what the numbers are and have posted them. Few still have yet to post real dynos. I think for 1995.00 I would be willing to put our chip up against anything. Lets do some 60-130 measurements and see where the cards lay. But please keep in mind we do not say it is worth 100 for just a chip.
#43
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Originally Posted by Woodster
C'mon almost 100 Horsepower from a "chip"????
Would be best to do some fun runs side by side...
Would be best to do some fun runs side by side...
#44
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Mark, on the Maha after you hit your peak RPM you bump your gear shift into neutral, the Dyno will measure the drag against the eddy current motors.. This resistance is calibrated into a HP factor. On the Maha dyno sheet the lower line on the graph is a plot of the resistance.
#45
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Johnny G:
yes car pulls to 1.0 bar very quickly now, and I have seen 1.1 register just briefly.
Does not miss a beat now--perfect drivability!
MK
yes car pulls to 1.0 bar very quickly now, and I have seen 1.1 register just briefly.
Does not miss a beat now--perfect drivability!
MK