roadkillrob

Eurocharged uses 19% for drivetrain losses in their math.

Rick X Joaquim

his base dyno was 409 and after dyno was 435.
so he gain 25 or so whp. Thats what he gained bhp since there is not mechanical mod i think of. Thats about right at 510

skratch77

I don't understand what the issue is. We are talking about 1% and this dyno got him 337whp so he gained 28whp

his 409 baseline is also with second cat delete and row boxes so there is your extra 9whp from a normal bone stock car.

Rick X Joaquim

at 18 percent he should be at 440 stock. As you mentioned he has cat delted, his whp should be higher, but he is down to 435. That minus the 9 whp u mentioned shoubd be 426. No way is putting 540 bhp

Mazspeed

When it comes to the dyno, you can make it read just about anything you want with plugging in different correction factors. I know of 2 dyno operators in my area that will put in higher numbers so that the customers will use them instead of using someone who will be more accurate. You can make even a dynojet read what you want it to.

Rick X Joaquim

If you read my point, i was talking about the bhp claim that many think they are putting 540 bhp with the v7.

Rick X Joaquim

If you want to have an argument, at least know what it is arguing to begging with.

Mazspeed

I understand that, but wanted to also address your exact words as well. I also feel that EC is not being truthful with their HP claims. The claims have been 540whp since the V3 tune and yet every tune that came after this was suppose to be a little bit more power according to EC, and that "540"hp claim never changed. I suspect that the dyno did read 540whp after putting in bogus correction factors.

Rick X Joaquim

This motor should put 510-520 bhp stock tuned or not depends wat you have . Anything above is bogus.

Mazspeed

What do you mean by this? Please explain.

zcct04

The key things here are that the OP gained 28 peak whp (437-409, or almost 7%) and he also picked up a chunk of low-end torque. That's an impressive improvement.

Discussion about bhp is really all speculation, but you are messing up the speculation with bad math.

Lets do it backwards. If he gained 35 bhp (at the crank) and if driveline loss is 19%, he's losing about 7 hp of that improvement between the crank and the wheels. 35 - 7 gives him a net increase of 28 whp, which is exactly what was measured.

Conclusion: since the whp went up 28, the bhp must have gone up about 35.

Is it 540 bhp? Nobody really knows and almost nobody really cares. The only number that's important is the 437 at the wheels.

kickinrocks

How is bhp even calculated by the manufacturer? Do they just take whp and divide by .82 (assuming 18% power train loss) or is there some way to measure the engine hp before they put it in the car or something?

Infiniti

great results OP, glad you like the power and had a good experience.

WTF was all this other nonsense i read?

hachiroku

kickinrocks

No f**kin idea bro. I just came to share my results about my tune experience lol. I shoulda never mentioned anything about bhp in my op and just left it wheel hp. My Bad!

Ludedude

The engine is dynoed outside of the car. They don’t calculate anything, they measure crank output.

See here: fast forward to 2:11 to see the dyno setup.

Jasonoff

LOL, was hoping to see the original head bolts up on the mechanical load simulation program.

Ludedude

zcct04

And again at 2:43 for more of the test cell and engine dyno.

My favorite part is at 0:11 when they tell us this is "a powerful motor with 525 hp."

And because I suspect this is the next question to come up - AMG does NOT do a full dyno test on every engine.

hachiroku

they do a dry compression dyno test on every engine. this simply checks for sealing. full dyno tests are random and not too sure how often they pull engines to do them.

Mag1c Carp3t

800 hours of testing and yet they made a motor with defective parts in the head.

Jasonoff

Took a lot longer than 800 hours to discover corrosion from being in a waterjacket of potentially ascetic coolant.

Mag1c Carp3t

True.

Mag1c Carp3t

After about how many files did you guys feel good about the tune?

kickinrocks

Mine felt good after the first try. Jerry was kind enough to give me 1 custom v7 tune, haven't really gotten to drive that one much but according to the dyno it's even better.