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Finally got around to doing some proper testing on the ZTK pump at The Circuit at Button Willow to compare it against my old plastic adjusting ring pump. I haven’t seen any real data showing the ZTK pump having higher output, so this was a good chance to find out for myself. Shout-out to...

cross posted on FB. I had a local shop build my trans with a PDS HPK stage 2 kit earlier this year. Car ran great, but I noticed that the transmission was leaking fluid when I pulled the transmission cover off while servicing other parts of the driveline. Took my car back to the shop to fix the...

Car is running on an e40 custom flex fuel tune, but I will sometimes have to flex down to e25-e30 at the track depending on how much e85 I bring to the track. 99% of the time the car is running great, but I noticed only sometimes in 5th gear in WOT, the timing will retard and the car will try...

Could use some guidance… I have newly developed creaking moving the steering wheel off center. There doesn’t feel to be any binding in the steering, and I can steer lock-to-lock without issue. The car is 75% track. KW DDCs Whiteline swaybar links Verus camber plates AFE swaybar Right strut...

I’ve been trying to do more research on this topic about the stock Bosch HDP6 pump found on b58 TU, and was wondering if people can provide insight. I know that the target operating pressure is 350 bar (5000 PSI). I’m under the impression that the HPFP will crash at ~4300 PSI (-700 PSI based on...

Recently installed a pure 850 which deleted the PCV heater element. As expected from prior research, I got a 16050A “crank case ventilation leakage” code. I double checked all the lines to verify they’re properly connected, and reseated the oil cap just to make sure there are no other outliers...

Engine Mods: BM3 stage 2 OTS w/ flex fuel, e50, AA downpipe, akrapovic exhaust, wagner intake manifold, liquimoly 5w30 special tec ambient temperatures 80F and sunny, 20-30mph winds. Last weekend I was at Las Vegas motorspeedway outside track. I shared my car with my brother for his first HPDE...

Long time reader and wanted to give back to the community. I have a BMW z4 m40i that I occasionally track. I notice my stock brakes fading. The easiest answer was to switch out to more aggressive pads and higher temp fluid, but I disliked the idea of having to swap out pads between track and...

Hi everyone, new to the forum, but active on Bimmerpost. Unfortunately the mod scene for the z4 is black badging and window tinting with that crowd. anywho here are the facts: -2020 bmw z4 m40i -BM3 OTS stage 2, e30 + 91ACN fuel - AA dp, exhaust, intake. installed BM3 flex fuel kit earlier...