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Dyno Tested Auto Vs Manual Driveline Loss

STATUS

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2rismo Grand Master

2rismo

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Why not? :P

Ive seen other manufacturers put out difference power figures man v auto, maybe they are?

Because they're quoting the engine power as measured at the flywheel - i.e. before the drivetrain. Aside from different components or a different tune-up, there's no other way to account for the difference in power.

They're not accounting for the drivetrain because they're not talking about rwhp.

Swiper the Fox Grand Master

Swiper the Fox

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Posted
Because they're quoting the engine power as measured at the flywheel - i.e. before the drivetrain. Aside from different components or a different tune-up, there's no other way to account for the difference in power.

They're not accounting for the drivetrain because they're not talking about rwhp.

B-I-N-G-O and bingo was his name O. :P

400kw Collaborator

400kw

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Hi guys just thought i would add my 2 cents worth .i have a r33 gtst with a twin turbo rb 30/25 ..and with a manual ,at the moment im running 488.9 rwkw .and im about to put a c4 auto in from als race glides .and a dominater convertor .i will be running everything the same but from manual to auto ,so i will post up how much power i lose when the job is done .

cheers

2rismo Grand Master

2rismo

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There's little point in doing that aside from pure interest's sake. Racing converters are very different between stall speeds and this is where all the difference will come from. A 3000rpm converter will be different from a 5500rpm converter probably in peak hp but almost certainly in terms of the area under the curve.

STATUS Grand Master

STATUS

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Hi guys just thought i would add my 2 cents worth .i have a r33 gtst with a twin turbo rb 30/25 ..and with a manual ,at the moment im running 488.9 rwkw .and im about to put a c4 auto in from als race glides .and a dominater convertor .i will be running everything the same but from manual to auto ,so i will post up how much power i lose when the job is done .

cheers

i would look at a AOD aswell, it will give you a mech lock on over drive for street duties and still handle nines (800hp) (quick look on TCI, B&M and LenTech will confirm) all day long. Can race glides build decent AOD's as they are pretty specialised trannies? after speaking to a few Trans building companies in the states the AOD is the obvious choice for a tough street car with friday night drag action in mind.

Im currentley building a combo atm that will make around 360rwkw through a C4 (now an AOD) 5500rpm stall its running 3.55 gearing, so around 1600-1800rpm @ highway speeds depending on final tyre hieght choice.

Disregard the whole lot above if your car is not regulary street driven :D

ps i prefer to tune the car firs twith a stock stall (or up to 2500), then dial it in with the race converter...... tuning anything with decent power and a stall speed over 5000rpm can be a night mare.

Edited by URAS
2rismo Grand Master

2rismo

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ps i prefer to tune the car firs twith a stock stall (or up to 2500), then dial it in with the race converter...... tuning anything with decent power and a stall speed over 5000rpm can be a night mare.

It becomes a dollar issue with custom converters though. If it was a Windsor/C4 combo then a stock converter will work. But when you start mixing your manufacturers it means getting a second custom job made just to tune. PITA.

STATUS Grand Master

STATUS

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It becomes a dollar issue with custom converters though. If it was a Windsor/C4 combo then a stock converter will work. But when you start mixing your manufacturers it means getting a second custom job made just to tune. PITA.

too true but the end result is far superior and $800-$900 dollars is pocket change compared to the average 10-15k engine package.

2rismo Grand Master

2rismo

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If anyone saw the thread I posted in the Drag section on that 8-sec daily driver they might have noticed it runs an AOD variation too. They're certainly becoming a serious option now. I reckon they will be in aus in about 10 years. :D lol

Fastrotor Proficient

Fastrotor

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Whats an AOD guys ? Some sort of lock up clutch in the converter ?

Thats the best part of my jatco i think, and why i didnt mind going to 3500 stall. Once locked up, no difference in fuel ecconomy when crusing.

Mike at MV autos said while i was talking about custom auto controllers, that i could try locking up the converter once in top gear at drags, . I was worried it wouldn't hold but he said it would. Said one of his customers had gained nearly 10 mph doing it !

Locking up the converter is also great for tuning the low end/light load on the dyno....

Without it though , thats where the mainline dynos rpm tracking is real handy !!! very handy feature when working with autos !

Gary

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