S54 Dyno Database

[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

[digger]

Stash1,

I use to live at that side of the pond I am not a fan of how European's do a dyno.
Their dyno relays on crank or called flywheel hp.

Whit another words, no one knows how much is the dyno calculating the drive train loses.

Why I like Dyno-Jet at 14% drive train losses some consider 15% bit I am at 14%.
Std E46M3 on dynojet puts down somewerw between 275rwhp to 280rwhp. Ones you have
that % figured and then you ad parts you know the gains at the crank by calculating 14% One
takes 333hp crank SAE and -14%-15% you come up to that number +/- with very small
variations like weather temp, humidity, worn out engine etc are subject to this minimal variation.

I have friend in EU Germany who tuned his E39M5 and per the dyno and tuner he pulls 460hp crank
only from Tune. There is no S62 in existence that will produce 60hp at the crank gain from 400hp
factory crank hp, from tune only !!!! period put on pump fuel.

S62 with the best spoke tune will make ~25-30hp crank maaaaax. 415 SAE crank - 14%= around
356rwhp. So 460hp DIN - 22% should match what a healthy tuned S62 will produce in US Dyno-Jet.

Per our US calculation 460hp crank - 14% we should see 396rwhp dyno-jet something that will
never ever happen from tune only. Perkins build S62 will be in that range of power.

Dyno HP should be calculate coming from Factory numbers. Meaning if we take std E46M3 to
a European Dyno we should see exact in the range 339-343hp crank....as how BMW AG
advertised in EU E46M3 at the Geneva autoshow back in 1999.

US dyno do fluctuate by tremendous amount and one will never see consistency as how we
see her in US using Dyno-Jet.

Regards,
Anri

It says 295 whp and 373 bhp and 78 hp losses as tested/uncorrected. the corrected "flyhweel" numbers are 375 hp / 273 lb-ft. which is fairly close to a CSL albeit the cams are little larger hence numbers are a almost 20bhp higher torque numbers similar

Not sure the relevance of m5 example, there are s54 dynos flung about on these forums with more rwhp than flywheel estimates for the same mods so funny business on both sides.

the Maha is fairly reputable dyno brand, they are in the US to but most operators dont seem to use the coast down feature in these jurisdictions