T350 Dyno figs
Discussion
willtvr said:
Zippee said:
Standard 3.6? If so they're very good. Factory is supposed to be 350 at the fly so a 20bhp drop to the wheels is very good.
No, its 4.0l.
Ian,
Typical power losses for RWD car on a rolling road can be IRO 12-14% for cars over 300BHP. Good guide is take the RWHP, add 10 then divide by 0.88. This gives you car something around 390BHP, probably very realistic and I would be very happy with those real world sounding numbers. Must be nice to drive after the re-map.
The transmission losses for the T350 at Austec suggests the car should run huge coolers on the gearbox and diff with water cooled wheel bearings to cope with the heat that must be generated in the transmission - they are silly, but give a good pub talk figure
Typical power losses for RWD car on a rolling road can be IRO 12-14% for cars over 300BHP. Good guide is take the RWHP, add 10 then divide by 0.88. This gives you car something around 390BHP, probably very realistic and I would be very happy with those real world sounding numbers. Must be nice to drive after the re-map.
The transmission losses for the T350 at Austec suggests the car should run huge coolers on the gearbox and diff with water cooled wheel bearings to cope with the heat that must be generated in the transmission - they are silly, but give a good pub talk figure
Edited by TVR_owner on Friday 30th April 10:19
The Austec plot is from a MAHA dyno - these (it's said) are set up to accurately measure flywheel power and always produce much lower "at the wheels" numbers than other dyno types. To quote from another forum:-
"The maha dynos have 2 contact patches per wheel. What the maha does is measure how quickly the car can spin the dyno and produce a "power at the dyno" figure. This figure should ideally be ignored as its not a power at the wheels figure. Its called wheel power on the dyno chart, but the thing to remember the dyno has 2 contact patches per wheel. Your car on the road doesnt."
Therefore a Power 4.3ltr that made 370 at the wheels on one dyno would make less than that on Austecs MAHA, but they should both come up with the same flywheel figure.
"The maha dynos have 2 contact patches per wheel. What the maha does is measure how quickly the car can spin the dyno and produce a "power at the dyno" figure. This figure should ideally be ignored as its not a power at the wheels figure. Its called wheel power on the dyno chart, but the thing to remember the dyno has 2 contact patches per wheel. Your car on the road doesnt."
Therefore a Power 4.3ltr that made 370 at the wheels on one dyno would make less than that on Austecs MAHA, but they should both come up with the same flywheel figure.
RM75 said:
The Austec plot is from a MAHA dyno - these (it's said) are set up to accurately measure flywheel power and always produce much lower "at the wheels" numbers than other dyno types. To quote from another forum:-
"The maha dynos have 2 contact patches per wheel. What the maha does is measure how quickly the car can spin the dyno and produce a "power at the dyno" figure. This figure should ideally be ignored as its not a power at the wheels figure. Its called wheel power on the dyno chart, but the thing to remember the dyno has 2 contact patches per wheel. Your car on the road doesnt."
Therefore a Power 4.3ltr that made 370 at the wheels on one dyno would make less than that on Austecs MAHA, but they should both come up with the same flywheel figure.
That would explain why it doesnt have fried transmission then!!"The maha dynos have 2 contact patches per wheel. What the maha does is measure how quickly the car can spin the dyno and produce a "power at the dyno" figure. This figure should ideally be ignored as its not a power at the wheels figure. Its called wheel power on the dyno chart, but the thing to remember the dyno has 2 contact patches per wheel. Your car on the road doesnt."
Therefore a Power 4.3ltr that made 370 at the wheels on one dyno would make less than that on Austecs MAHA, but they should both come up with the same flywheel figure.
, how rude!! 
TVR_owner said:
Ian,
Typical power losses for RWD car on a rolling road can be IRO 12-14% for cars over 300BHP. Good guide is take the RWHP, add 10 then divide by 0.88. This gives you car something around 390BHP, probably very realistic and I would be very happy with those real world sounding numbers. Must be nice to drive after the re-map.
The transmission losses for the T350 at Austec suggests the car should run huge coolers on the gearbox and diff with water cooled wheel bearings to cope with the heat that must be generated in the transmission - they are silly, but give a good pub talk figure
Thanks John,Typical power losses for RWD car on a rolling road can be IRO 12-14% for cars over 300BHP. Good guide is take the RWHP, add 10 then divide by 0.88. This gives you car something around 390BHP, probably very realistic and I would be very happy with those real world sounding numbers. Must be nice to drive after the re-map.
The transmission losses for the T350 at Austec suggests the car should run huge coolers on the gearbox and diff with water cooled wheel bearings to cope with the heat that must be generated in the transmission - they are silly, but give a good pub talk figure
Edited by TVR_owner on Friday 30th April 10:19
Wasn't sure what to expect. Haven't driven it yet as not picking it up until Tuesday. Will be a lot happier now knowing its fuelling correctly.
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