I went to the dyno the other day, to see if I have cracked the 600hp barrier (480-500rwhp, depending on losses).

Before we begin, one caveat, something is off with my numbers, I originally believed AFRs were no good, but now I suspect the clogged chargecoolers

First run, hood open, 474 rwhp, 606 rwNm
Second run, hood closed, water meth on 463rwhp, 596 rwNm
Third run, let the engine cool, hood open, water meth on, 493 rwhp, 606 rwNm







if you divide 320 by 390 (stock rwhp vs ehp) you get 0.82 (18% drivetrain loss), so divide 493 by 0.82, and you get 601 hp.

HOWEVER, this is with caldoofy's headers, cats, and exhaust. I am taking davey as a refference, he was making 529 axle hp on a dynapack, so basically what I am making, albeit with stock manifolds. I ca attest a 3-3.5mph trap speed difference in the 1/4 mile from my original 2.5" exhaust & sport cats to caldoofy's system. And my original cats & exhaust gave me 3mph trap speed difference from stock.

So this means compared to davey, I am still about 40-50 hp behind, all else being equal.

Good news is my AFRs are not lean, as you can see in the clip below!


So now I am left to wonder, if I have water meth, does it matter if my chargecoolers are gunked up? Any ideas where the other 50hp may be hiding?


Now an interesting bit:

You can see the dyno sheet which states that 493 rwhp is 525 engine hp, with 32hp calculated drivetrain losses.

I told the owner that from what I have learned, 15-20% is a good estimate from engine to wheel hp, and he said I am dead wrong, because he has the best dyno in the world made by two Spaniards who on a dyno forum mop the floor with all the Americans, and that the Americans are light years behind. Otherwise he was very nice, so I did not comment on his statements, but it is very hard for me to believe that 1. I have 3% drivetrain losses, and 2. everything I have learned over the last 20 years is BS. But again, I am just an amateur, and he does that for a living, so he's the expert, I guess... Does anybody here with more experience wish to comment?

 

3% losses! Is he getting confused with electric cars?
Not a chance is it only 3% losses Just a quick look at where you get these losses and that makes no sense at all, rotating parts in the engine, sloshing the oil about, pumping water, pas, arcon, alternator, various belts, torque convertor and churning the oil in the box, prop shaft and diff plus wheel bearings.