Power Loss

i'm not sure if this is the correct place to post this question but.........
what is the average % power loss through the drivetrain on awd mitus?
more specificaly my evo. anyone know?
i had mine dynoed and was just wondering?

[TheBlizzard]

I remember hearing somebody say that it was 10% on a 90-99 DSM, I am not sure about an EVO though. Should be the same.

CRAIG

[CVD]

Few people have hard evidence on actual drivetrain loss, so unless you put your motor on an engine dyno, dont go around telling people how much "bhp" your car has. It usually just makes you look bad.

[MATCHBX]

I've heard closer to 20% but it could be wrong. You would definately have to have it engine dyno'd to find out. Whatever you do, don't trust what the manufacturer claims as bhp.

I've heard 10% on fwd and rwd vehicles and close to 20% on awd vehicles. But like I said before, I could be wrong.

[Enes]

everywhere i've read is that its about 25% for awd
about 35% on automatic awd
about 15% on fwd manual
and about 25% on automatic fwd

but thats just what i have heard...

-D

[john]

I have heard roughly 20% loss on a AWD manual and 9% on a FWD manual dsm. What did you put down for numbers? I take it you are disapointed???

[JET]

I have heard a lot of talk about this. A 2wd is usually 12-15% and the mitsu AWD is ~20% with Suby being closer to 25%. Auto's usually add about 10% more loss.

thanks guys i was just wondering for info purposes. i was only slightly disapointed with my numbers. 240.8@5kwhp and 246.6@7kwhp it hit peak torque 4k, 264.5 ft lbs.
i thoght it would be a bit more, like an inch over 250. i think it would be there with race gas. my run was on 92 octane.
let me know what you think.
-A

[TheBlizzard]

Sounds like you have pretty much the same setup as Ryan. Not sure if your exhaust is turbo back or not but you should be higher than that. I think thats the only thing that he might have that you don't have.

CRAIG

ryans puttin out more boost and ran race gas. my exhaust is cat-back.

[niterydr]

John hit 516whp on elites fwd dyno
and he hit 403whp on rs motors awd mustang dyno
and the mustang dynos 'typically' run about 20% less, which would put him at about 483.6 whp in awd.. which would mean the awd adds approx 6% more drivetrain loss to the fwd numbers.
just some fyi.
so fwd being 9% and awd being 15% is good idea.
figure 10% more for the awd if your on a fwd dyno, and you should be good.
just my $.02.

[john]

What are your mods?

[Pushit2.0]

yep, well 420 on the first pull in 4th, then 401 in 3rd, spinning the tires both times at my peek power.

~John

[Shane@DBPerformance]

John didn't dyno on both dynos on the same day either though, so it it is hard to say exactly what the difference would be. Most of the people I have seen dyno 2WDs on both get about a 15% higher number on a dynojet or dynapack going off of Mustang dyno numbers.

It's hard to say if the drivetrain loss should be a simple percent though. I read some page a while ago with a more complex drivetrain loss formula that had some loss built into it. So that a car making a lot more power would actually have a smaller percent loss than one making a lot less power.

It's all just numbers though. If you took a 100% stock awd and put it on whatever Vishnu's dyno is you might think there is 40%+ drivetrain loss when going off the factory HP numbers(who knows if those numbers are correct either, they obviously weren't on the RX8s or SRT4s). Think of the heat that would be created in the tranny if 40%+ of all the power was dissappearing in it.

[JET]

Shane brings up a very good point. The loss is not going to be a straight percentage. It will be a give HP of loss, then the extra amount of drag created by the extra HP for friction on the gears because of the increased force put on the gears. Say a stock car has 25 hp of drivetrain loss plus 5% of its HP. If you use the same equation it will be a lot less total percentage on a higher HP vehicle.

[niterydr]

so you guys are saying that there is a cap to the hp lost through driveline?
Or you automatically lose set amount of hp and the rest is a percentage that varies with your power output.
Imo, you put down what you put down, race them to find out who has more power .
unless you have an engine dyno, then you actually know how much power you really are making.