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Stroker396 Stroker396 is offline
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Car: 535i
Default How much Max PSI on 93? - 09-29-2020, 07:27 PM

So E85 is less prone to knock (higher octane) which allows you to increase the level of boost correct. The downside is that it requires 30% more volume hence the need for better lpfp, pi etc...

On 93 octane with a better lpfp fuel delivery is not a limitation. So therefore it must be knock (higher compression from higher boost)

So, if this is the case, How can I monitor for knock? to be able to work up a custom map 6? I assume to run a richer AFR I would need to modify the tables in the BEF? (Tunerpro)

Custom tuners have been able to reach over 600whp without PI (but other supporting mods) I am guessing map 2 and 5 are far below that.

Before the I got he car right it seemed to be overboosting (and fast). Right now it seems to be dead on for map 2 at 14.5 psi

E85 is not always available I would like to maximize the cars performance on 93.

Ideas/suggestions?


08 535i MT Blk. CP w/BOV, JB4, BEF, DCI, edited things delete, Inlets, 7" FMIC, SP exhaust, X Clutch, poly/delrin shifter bushings, Walbro 525, RB PCV, catch can, VRSF oulets, MMP Gen 1 Stg3, 3.5Tbar, 2 step, FSB WMI
Anti Lag up next.
On Hand: JB4 PI Controller
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BeGooD69 BeGooD69 is offline
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Default 10-03-2020, 07:44 PM

I pushed 735whp on 93. One of the secrets is cooling. I do use pi for more delivery of fuel. Have the the fuel bar on the high pressure isolated from heat and a goof fmic. Should help increase knock resistance. Good luck
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Stroker396 Stroker396 is offline
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Car: 535i
Default 10-04-2020, 07:40 AM

Thats a pretty impressive level. PI will be coming eventually.

I did some reading and looks like with the JB4 the only way to monitor for knock is to look in the logs for instant 3degree timing drops as an indicator. I was hoping for somethi g more real time etc...

Since the JB4 does not like anything plugged into the OBD2 port I was thinking about something like this to be able to tune better
Knock Monitor Pro Tuner Nerd

I know there is a lot of power still in it.


08 535i MT Blk. CP w/BOV, JB4, BEF, DCI, edited things delete, Inlets, 7" FMIC, SP exhaust, X Clutch, poly/delrin shifter bushings, Walbro 525, RB PCV, catch can, VRSF oulets, MMP Gen 1 Stg3, 3.5Tbar, 2 step, FSB WMI
Anti Lag up next.
On Hand: JB4 PI Controller
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