S54 Dyno Database

[digger]

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The dip between 2.5k to 4k...because of the BW race?

to boost 2.5-4k you could experiment with exactly doubling (or close to it) the current merge distance (which would still be slightly shorter/less than the stock merge distance by looks of it) but it will likely soften 4-5k a bit as a compromise but shouldnt hurt anyting above 5k. its expensive doing custom exhausts and hard to undo , so it depends how much it bothers you for the type of use

i am suprised nobody as brought something similar to market as a bit less of a compromise and the 6-2-1 is the superior power setup over 6-2-H/X-2 with other advantages to boot

[paulclaude]

Thanks for the insight!

I had your canned tune for awhile and worked flawlessly for years! Very happy with it! Dyno’d at 325whp with it.

I switched because I needed a detune for a NASA class.

Great to hear! Certainly a healthy motor, especially with the stock camshafts.

This is promising, almost identical to my current build. BW race is the sections 1,2,3 correct? My only difference would be having the street/track which has a stock section 1. I'm curious where I'll fall and if I have that same low rpm dip.

You won't have any dip with the Street/Track version that maintains section 1. Potentially, the full race version might have a touch more top end power 🙂

[Darbshaw]

Epic Alpha-N dyno tune
Megan headers
3.5" BW race
Crappy Injen Intake
JB Racing Flywheel

337whp/267yq

That is about 12 more hp! Randy fixed the dip between 4.5k to 5.5k and it feels a lot better from 3.5k to 5.5k.

The dip between 2.5k to 4k...because of the BW race?

This is promising, almost identical to my current build. BW race is the sections 1,2,3 correct? My only difference would be having the street/track which has a stock section 1. I'm curious where I'll fall and if I have that same low rpm dip.

[bigjae46]

Yes, cleaned by the guy here who did it years ago.

[BMWfanz]

Epic Alpha-N dyno tune
Megan headers
3.5" BW race
Crappy Injen Intake
JB Racing Flywheel

337whp/267yq

That is about 12 more hp! Randy fixed the dip between 4.5k to 5.5k and it feels a lot better from 3.5k to 5.5k.

The dip between 2.5k to 4k...because of the BW race?

Nice result! Stock injectors?

[bigjae46]

Funny enough I am going through same thing based on feedback from Epic. I am trying to stuff the largest cone filter inside the factory airbox (goal being more flow without the heat). I’d be happy just getting to 310whp…

And I agree with above, I’d use heat reflective tape around the intake pipe and heat shield to see if that helps work lower IATs.

I just plastidipped it and IATs are down 15-20 degrees.

[Nardo S54]

It's crappy. Randy pointed out that being aluminum it absorbs a lot of heat which could help explain why the car sucks in hotter temps. He also noticed my IATs were high on the dyno. Randy recommended plasti-dip'ing it. Doing that now, we'll see if it helps.

Thinking of what the alternative will be,

Funny enough I am going through same thing based on feedback from Epic. I am trying to stuff the largest cone filter inside the factory airbox (goal being more flow without the heat). I’d be happy just getting to 310whp…

And I agree with above, I’d use heat reflective tape around the intake pipe and heat shield to see if that helps work lower IATs.

[Bry5on]

It's crappy. Randy pointed out that being aluminum it absorbs a lot of heat which could help explain why the car sucks in hotter temps. He also noticed my IATs were high on the dyno. Randy recommended plasti-dip'ing it. Doing that now, we'll see if it helps.

Thinking of what the alternative will be,

Gold foil baby!

[bigjae46]

Very impressive - how do you like your crappy Injen intake? is it modified in anyway?

It's crappy. Randy pointed out that being aluminum it absorbs a lot of heat which could help explain why the car sucks in hotter temps. He also noticed my IATs were high on the dyno. Randy recommended plasti-dip'ing it. Doing that now, we'll see if it helps.

Thinking of what the alternative will be,

[Nardo S54]

Epic Alpha-N dyno tune
Megan headers
3.5" BW race
Crappy Injen Intake
JB Racing Flywheel

337whp/267yq

That is about 12 more hp! Randy fixed the dip between 4.5k to 5.5k and it feels a lot better from 3.5k to 5.5k.

The dip between 2.5k to 4k...because of the BW race?

Very impressive - how do you like your crappy Injen intake? is it modified in anyway?

[bigjae46]

Nice power for the spec! The dip low down is due to the merge after the headers on the BW race. You won't be able to tune that out without moving the merge point in the exhaust to further back in the system (i.e. running dual pipes, then merging into single).

Thanks for the insight!

I had your canned tune for awhile and worked flawlessly for years! Very happy with it! Dyno’d at 325whp with it.

I switched because I needed a detune for a NASA class.

[paulclaude]

Epic Alpha-N dyno tune
Megan headers
3.5" BW race
Crappy Injen Intake
JB Racing Flywheel

337whp/267yq

That is about 12 more hp! Randy fixed the dip between 4.5k to 5.5k and it feels a lot better from 3.5k to 5.5k.

The dip between 2.5k to 4k...because of the BW race?

Nice power for the spec! The dip low down is due to the merge after the headers on the BW race. You won't be able to tune that out without moving the merge point in the exhaust to further back in the system (i.e. running dual pipes, then merging into single).

[bigjae46]

Epic Alpha-N dyno tune
Megan headers
3.5" BW race
Crappy Injen Intake
JB Racing Flywheel

337whp/267yq

That is about 12 more hp! Randy fixed the dip between 4.5k to 5.5k and it feels a lot better from 3.5k to 5.5k.

The dip between 2.5k to 4k...because of the BW race?

[Nardo S54]

My Z4 M put down 298hp / 237lb-ft (Dynojet SAE 5). Only mods are Euro headers, 100 cell hfc and OTS tune by Epic.

[CrisSilberGrau]

What was your buddies set up like, headers, Sec 1, 2, cams, intake…..anything else.

Oem euro headers, CPI rasp sec 1, oem sec 2, DIXIS. With and AFE intake car made around 315whp on a dynojet, Hassan mentioned the sec3/muffler was slightly holding back. It matters if you are after every little bit.