Except that heat isn't only going to the fluid. It also transfers into the gears and cases, heats the tire rubber and gets rejected to atmosphere. I'm not going to try and guess on drivetrain loses but it's probably not that high. Seems like modern 2WD transmissions are in the 11-12% range last time I saw something from a manufacture on the topic. Another 10% into the transfer case, rear diff, axles, and tires? Maybe.

Fact is, it made 480HP to the wheels on 35psi. That's not very good.

It's also in shootout mode, which I thought was some ridiculously high add-on as well?

 

I made 450whp on 92 octane on 20psi with a 7670... If that says anything.

 

It is UK HP and from what I see your HP is diff than ourssad but its a fact,
This car has 1000cc Injectors in it and they are at 92% at 7000rpm at 11.7afr, This will give you a very good guide on real hp.

Mark

 

No doubt the EFR8374 moves enough air to need 92% duty to supply 11.7AFRs at 37psi, and that equates to a good amount of power if the engine is able to extract the potential of the air/fuel mixture but I'm going to go out on a limb here and say that UK pump gas is WAY octane limited at ~2.2-2.5bar of boost.

No matter what way I look at it (factoring in DD dyno) 480whp is not that impressive for the stress you are putting on everything, though I'm guessing some decent fuel would fix that problem.

 

No a decent spec engine will help as this one only have pistons/rods/cams,
The fuel is ok but more oct is always better lol.

Mark

 

Hypoid rear differential would lose about 5% all by itself. Although that's not 5% of the total power in this case - it's only 5% of the power going to the rear.
Many years ago when I was in engineering school the total drivetrain loss for a conventional front engine rear wheel drive car was usually taken to be 15%. I could believe the 11-12% figure for a modern front-wheel drive car. I really think the 22% reduction figure is pretty close to reality for the AWD beast. I just can't figure out how the dyno arrives at a decent number.

I agree with you guys that the HP result seems low for the boost level and the engine with 280 Kelford cams. But maybe it's just tuned with super retarded timing or something because of the gas octane used?

At Onlineconversion.com I see 4 different kinds of HP: International, metric, electric, and water. The 2 with the biggest difference between them are "International" and "metric". For example, 480 international HP = 486.7 metric HP. If the Brits have something else going on I'd like to know what it is!

 

The Brits like to think other countries have more generous hp calculations - one common claim is US whp are the same or greater than British engine hp. What is mysterious about that is the American drag strips seem to also be fooled by apparently generous hp numbers non-British cars make. Some NZ and Australian cars were accused of running on downhill dragstrips to get their times/trapspeeds a couple of years ago haha

 

Talonboost, yeah, I figure the EVO is a modern FWD with some extra parts so I figured I'd start there. Like I said, MAYBE it is that high.

As far as US HP being higher, I think the 1/4 results from reputable shops can put that argument to rest. There are definitely shops on both sides of the ocean that are using inflated numbers, but again, going by reputable shops I have to disagree with this idea that US numbers are inflated. Buschur went like 9.0@159 on something like 670WHP. There are LOTS of sub 600HP cars out there that rip off 9 second passes.

I think what they want to point out though, there are a lot of cars at shops that do put out inflated numbers. There are also a lot of cars that make the power but can't put a run together to save their life (poor driving, poor chassis setup, poor tracks, etc.)

As far as IDC to demonstrate power though, 1000s on a 255 run out of fuel at about 500WHP. A lot of it is the pump not keeping up though.

 

This car has two aeromtive 340 pumps running all the time and the walbro 255 caps out at a UK450hp at the flywheel.

Mark

 

IMO.. American horsepower is divided up into DJ and MD hp. The 13% rule is pretty consistent... the MD reads 13% lower than the DJ.

So Buschurs 670whp MD would be 760whp DJ.

My 7670 on 92 in MD numbers on 20psi would be 403whp MD.

 

Dynapack numbers and Dynojet numbers seem to be much of a muchness from what I've seen, as well as Mustang and Dyno Dynamics - so similar rules apply?

 

FWIW on a MD you'll max out a single Wally 255 on E85 at around 420-430 AWHP.

 

Dave, has FFTEC done any more EFR setups on Evo's besides the GG shop car? Care to post any information?

 

Agreed.

Always ~420 MD, ~475-480 DJ...
Every time on stock wiring.

 

On my Dynapack I see about 340-350 hp on a single Walbro 255 on E85 and 500-510 max on pump fuel.

My stock Evo 8 with 3" exhaust showed 224 hp on my Dynapack. (the only stock Evo 8 I have tested btw)
What hp #`s does a stock Evo 8 put down on a MD and a DJ?