F10 535i JB4 downpipe E85 Dyno Results

[jemmie]

I have a 2011 535i with 50K miles and the following modifications:

-JB4, Map 5
-Evolution Racewerks downpipe
-VRSF charge pipe
-Custom cheap short ram air filter ($10 silicone tube with elbow, K&N RF-1045 air filter)
-Flex fuel wire
-Approximately 5 gallons of E85

Stock turbo, intercooler, exhaust, etc.

Attached is the dyno result on Dynojet a few days ago.

Max Torque: 432
Max HP: 357

Assuming 12-13% drivetrain loss, that's roughly 500 ft*lb torque and 400 HP. That's about what I would have guessed because I had an E39 M5 before and, before dyno test, I thought this thing was as fast or faster than the E39 M5 in a straight line. I did some 1/4 mile (less than ideal) runs on a highway, timed with an OBD-II device, and get low 13's.

The torque curve could be flatter. I have been told that's because the OEM turbo is just not large enough to keep up with the air demands of the engine. But that's still a lot of torque in the part of the RPM used most (>300 ft*pd at wheels between 3K and 6K RPM and >350 ft*lb at wheels between 3,200 and 5,300). My logs show boost of Map 5's max of 17.5 PSI between 3,500 and 3,900 only and >15PSI between 3,200 and 5,100 RPM.

I'm very satisfied with the performance of this car given the <$2,000 in upgrades. Any other upgrades that don't touch the turbo or intercooler I can do?

Thanks.


BMW 535i Dyno Results 12-29-2016.jpg

[Stück]

You won't find many people on here with real modded F10's to compare with.

The stock turbo falls on its face at about 4k rpm and the boost pressure tapers down to redline.

Further upgrades from where you are would be a ditching the JB4 in favor of a real flash tune, an upgraded intercooler, and an upgraded turbo.

The stock intercooler is pretty small, and not really even adequate for the factory turbo/tune when driven hard. It quickly heatsoaks and it miserably fails at keeping IAT's low under boost. The Wagner intercooler is the best thing out there for our cars. It fits perfect and install takes less than an hour.





From there consider a turbo upgrade, like the Pure Stage 1 CHRA, or the Stage 2 complete replacement. The Stage 2 offering absolutely dwarfs the factory turbo. Toss a Go Fast Bits upgraded Diverter Valve in while you're there.




You may also consider lighter forged wheels with non runflats. Reduction of unsprung weight makes a huge difference to acceleration, braking and handling.