Put the car on the dyno today. Wondering how much more power I could make with a proper tune

twinturbos

Sergeant
Jan 1, 2019
282
74
0
Ride
E92 335i MT
The numbers are decent enough. The power delivery is very weird... overboosts, cuts fuel, goes back at it.
Running DOCRACE with 6266BB
fuel-it stage 2 LPFP
R8 coilpacks
New HPFP
New index 12 Injectors
94 + 50/50 WMI
JB4+MHD BEF map 4 23psi
555whp, 444wtq on a mustang dyno.

What do you think ?
I'll grab the logs from my other phone and post
 

RuskiRacer

Captain
Jul 17, 2019
1,209
757
0
Ride
2009 e93 335i
The numbers are decent enough. The power delivery is very weird... overboosts, cuts fuel, goes back at it.
Running DOCRACE with 6266BB
fuel-it stage 2 LPFP
R8 coilpacks
New HPFP
New index 12 Injectors
94 + 50/50 WMI
JB4+MHD BEF map 4 23psi
555whp, 444wtq on a mustang dyno.

What do you think ?
I'll grab the logs from my other phone and post
Seems about right my friend made 630 whp on 24psi on full e85. Doc race precision 6266jb, dual walbro 525, helix overdrive, index 12, precision race works coils
 
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yuli8466

Specialist
Sep 6, 2018
99
23
0
The numbers are decent enough. The power delivery is very weird... overboosts, cuts fuel, goes back at it.
Running DOCRACE with 6266BB
fuel-it stage 2 LPFP
R8 coilpacks
New HPFP
New index 12 Injectors
94 + 50/50 WMI
JB4+MHD BEF map 4 23psi
555whp, 444wtq on a mustang dyno.

What do you think ?
I'll grab the logs from my other phone and post
mustang dyno read are different from dynojet.
 
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Torgus

Brigadier General
Nov 6, 2016
2,671
2,193
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Boston
Ride
ACF 6466 E92 + METH
Well a 'proper' tune is small money so I see no reason not to. Especially if you can't figure out the "power delivery is very weird... overboosts, cuts fuel, goes back at it." issues you are having. Given what you have spent a custom tune will be able to get more out of your set up than an off the shelf back end flash + JB4 I would think.

Once you post the logs perhaps something will become apparent.
 
Last edited:

Payam@BMS

Sergeant
Oct 27, 2016
412
265
25
33
Not saying the JB4 is the issue I actually would like to keep it but the tune seems inconsistent. Need to fine tune it.


Log looks okay.

I think I see the issue with boost control, duty bias is not set to 50 as it should be across the board.
Set that, lower FF to 10 and get another log. We'll have to rework that side, a couple logs back and forth.
 
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twinturbos

Sergeant
Jan 1, 2019
282
74
0
Ride
E92 335i MT
Log looks okay.

I think I see the issue with boost control, duty bias is not set to 50 as it should be across the board.
Set that, lower FF to 10 and get another log. We'll have to rework that side, a couple logs back and forth.
Thanks ill try tonight