S54 Dyno Database

[stash1]

it baselined at 281whp which is a bit higher than stock but its a euro car, has the eventuri which eliminates the bulk of the losses from the induction system and it has a aftermarket ECU so its a straight forward thing to tune fuel PW and timing, ignition timing, vanos etc.

A stock M3 makes 285 ish on a DJ if its running right which would probably be slightly more than that if it was low mileage to so not much inconsistent there.

The elephant in the room is cams and airbox netted like ~15-20 numbers maybe, its a bit hard to tell as the corrections are only applied to the flywheel numbers and the rotating mass changed from 50-70kg but that’s a lot less than what many would have you believe even accounting for the eventuri

Yeah, think I’m following what’s going on now, and yeah...I’ve seen stock DJ numbers from high 260’s to mid 280’s on stock cars...depending on mileage, state of tune, etc. Yep, the delta struck me as odd too. I’m kind of used to seeing gains of 20-35 HP for cams/airbox—weird. Sorry Martyn, don’t want it to seem like we’re speaking about you while you’re standing in the room-lol. Think we’re just puzzled by the delta.

[stash1]

Very first dyno so no baseline. APE flex fuel kit, B-Spec tune, catless headers. Ethanol blend @ E53

Nice, seems like solid numbers for those mods! Was the B-spec an OTS tune or custom? Thanx for posting up!

[stash1]

Stan,

Read the Dyno with cams and box etc.

Do the math and you will see how much the dyno calculation will never make sense to you.

Rear wheel 294rwhp. Crank says 378 BHP (crank HP). So, 378-22%= 294rwhp.

Hope this will make more sense to you ?

Regards,
Anri.

I think I’m following...so, his car made 378BHP, and 294WHP...based on a 22% driveline loss vs. the more normally accepted 14-15%—correct? So, if we extrapolate, and figure the WHP based on say 14%, his actual WHP would be closer to 325? That seems a bit low to me (for the mods) vs. what I’m used to seeing. Typically, cars w/cams air boxes & supporting mods are in the 340-350WHP SAE on a Dynojet.

[Anri]

it baselined at 281whp which is a bit higher than stock but its a euro car, has the eventuri which eliminates the bulk of the losses from the induction system and it has a aftermarket ECU so its a straight forward thing to tune fuel PW and timing, ignition timing, vanos etc.

A stock M3 makes 285 ish on a DJ if its running right which would probably be slightly more than that if it was low mileage to so not much inconsistent there.

The elephant in the room is cams and airbox netted like ~15-20 numbers maybe, its a bit hard to tell as the corrections are only applied to the flywheel numbers and the rotating mass changed from 50-70kg but that’s a lot less than what many would have you believe even accounting for the eventuri

Digger,

I always see them in the range of 272-282 at max put on pump 91 gas.

Again small variations may vary in the the settings which contribute what you are seen
or experienced.

It says 295 whp and 373 bhp and 78 hp losses as tested/uncorrected. the corrected "flyhweel" numbers are 375 hp / 273 lb-ft

Correct, exactly what I have calculated in previous post. 378crank HP or (BHP UK)
minus 22% which is Exact what this dyno calculates the losses in %

Dyno-Jet per my personal experience have done quite few test is about 14%
I never believed those who will put losses in 17%range..

There is also another very important factor that plays roll in the dyno testings.

- How low the car is, suspension changes can create losses, toe, axle changes due to
being lowered etc.
- After market wheels with much wider tires will also be considered as drag factor which
All of this will reflect the end of the hp number.

Regards,
Anri

[digger]

Yep, think we’re on the same page. When I said the avg. stock M3 makes around 275-ish WHP...I was referring to SAE Dynojet numbers. What I’m still puzzled about though is the fact the Martyn’s projected 340-360 BHP number is about on par w/our DJ numbers w/similar mods...yet his stock base numbers seem way higher than our WHP numbers?

it baselined at 281whp which is a bit higher than stock but its a euro car, has the eventuri which eliminates the bulk of the losses from the induction system and it has a aftermarket ECU so its a straight forward thing to tune fuel PW and timing, ignition timing, vanos etc.

A stock M3 makes 285 ish on a DJ if its running right which would probably be slightly more than that if it was low mileage to so not much inconsistent there.

The elephant in the room is cams and airbox netted like ~15-20 numbers maybe, its a bit hard to tell as the corrections are only applied to the flywheel numbers and the rotating mass changed from 50-70kg but that’s a lot less than what many would have you believe even accounting for the eventuri