S54 Dyno Database

[bigjae46]

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

[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.

[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 🙂

[digger]

.

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

[bigjae46]

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

I am not worried about that region - track only. I might touch upper 3k a few times but usually it will be on purpose where I stay in a higher gear to deaden the torque because of a bump or tricky corner.

The BW race is all about weight savings and top end power. I think if you move the merge back it will add unnecessary weight for those who would buy this. You certainly wouldn't put a BW race on for the sound.

[digger]

I am not worried about that region - track only. I might touch upper 3k a few times but usually it will be on purpose where I stay in a higher gear to deaden the torque because of a bump or tricky corner.

The BW race is all about weight savings and top end power. I think if you move the merge back it will add unnecessary weight for those who would buy this. You certainly wouldn't put a BW race on for the sound.

it will replace 2-3 feet of single 3.5" with 2-3 feet of dual 2.375" (or whatever it is) which will be maybe 2-3lb so doesnt sifnificantly affect the core weight saving benefit (claimed 62) as the saving is not from piping sizes but lack of cats and lack of big resonator / big muffler but i do know people would be avoiding because of the torque dip

[bigjae46]

it will replace 2-3 feet of single 3.5" with 2-3 feet of dual 2.375" (or whatever it is) which will be maybe 2-3lb so doesnt sifnificantly affect the core weight saving benefit (claimed 62) as the saving is not from piping sizes but lack of cats and lack of big resonator / big muffler but i do know people would be avoiding because of the torque dip

Yeah but 2-3lbs makes a difference in the big picture. A lb here, a lb there…it all ads up.

[digger]

Yeah but 2-3lbs makes a difference in the big picture. A lb here, a lb there…it all ads up.

1 part in a 1000 lol

[samthejam]

Untitled by Sam DaJam, on Flickr

Nothing crazy
125k mile S54, no valve adjustment done to my knowledge.

HTE "canned" Tune
for these mods:
Megan Headers
BW Street/Track Exhaust 3.5"
BW Silicon Elbow

It has the stock airbox.
Original MAF, probably original 02s. Happy with how it's doin.

[samthejam]

Meant to attach this to other post.

[GregS86]

EPIC Alpha N tune
SuperSprint Stepped headers
3.5" custom exhaust
4" custom intake with ITG filter
Tilton clutch/flywheel
Underdrive pullies


327WHP, 260WTRQ(#'s are SAE corrected), however this motor will end up detuned for classing purposes.

[fourmula1]

I run detuned to 295HP for GTS3 but this is my max power tune.
2003, 97k miles, A LOT of track hours/miles.
Karbonius Race CSL Intake
Status gruppe headers cut band clamped to BW race section 1
BW race section 2 and 3
Tilton clutch
Underdrive pullies

Suggested he cant get enough fuel to it to push further....at this point it is lines or fuel pump I assume, everything else has been changed or cleaned. Not that I need more for my class.

[BMWfanz]

I run detuned to 295HP for GTS3 but this is my max power tune.
2003, 97k miles, A LOT of track hours/miles.
Karbonius Race CSL Intake
Status gruppe headers cut band clamped to BW race section 1
BW race section 2 and 3
Tilton clutch
Underdrive pullies

Suggested he cant get enough fuel to it to push further....at this point it is lines or fuel pump I assume, everything else has been changed or cleaned. Not that I need more for my class.

Do you have AFR installed? Have you measured it on max tune map?

[fourmula1]

Do you have AFR installed? Have you measured it on max tune map?

Just exhaust sniffer while tuning. I think I can view the data in winpep. Epic tune, not concerned.

[bigjae46]

EPIC Alpha N tune
SuperSprint Stepped headers
3.5" custom exhaust
4" custom intake with ITG filter
Tilton clutch/flywheel
Underdrive pullies


327WHP, 260WTRQ(#'s are SAE corrected), however this motor will end up detuned for classing purposes.

NIce! Swaintech coated headers?