Search results

Yeah, with you on that. A $400 secondhand JB4 is nowhere near the investment of EPC/Femto unlock + BM3 at ~$2200 (before custom tuning too)

As expected, trims are way too high. Struggling to exceed 20psi on this E30 blend without trims maxing out and causing more throttle closures. Since I have to underboost so much, ECU_PSI is way too low, indicating to the car that fuel demand is low (when its not). I'll just have to lower my...

Does sport plus make any difference at all? Haven't really seen anything that indicates there's more performance with it, but I'd be interested if its a throttle response thing.

This car has a bit of a tricky clutch, probably due to the CDV. 1st to 2nd, you really have to finesse the clutch engaging 2nd. Getting started in 1st is much easier, IMO. It's just gonna take some time and practice. Just avoid grinding gears or lettings revs get over 1500 when starting in 1st...

Confirmed - ~1000 miles, no CEL.

Been having some good luck using Jesse's advice. 19psi flat with no throttle closures after some logging today on Map 5 with FF/WGDC tuning to achieve an underboost (boost < target). Now I can switch to Map 6 and start raising the target and redoing FF tuning. Trims may be a limiting factor here.

No codes on my end - except occasional overboost because MTs hate JB4...

I actually have the same problem. Even when I have it in "left blinker" mode or "OEM mode", it always reverts to valve closed it seems, even in sport mode. Kind of annoying. Wish I could just disable CANFLAP all together and go back to stock operation. Maybe this is the mistake I'm making on...

Have to agree with you there. The information he provided was above and beyond for detail. Big Props to @Jesse DaBears for putting in considerable effort to share with us DIYers. And if you aren't a DIYer, his custom tuning service can get your car sorted out perfectly. We really appreciate...

Nah, stock plugs are fine for map 2.

I would really appreciate any help you have to offer. Let me get some better logs and I'll send your way.

Where am I not being humble? At what point did I claim to know better than you? I mean, I agree that its fucked to get paid 20 for hours of work - but cmon man, ~600 or whatever it is? Even your toughest cars, that's hundreds of dollars an hour to look at logs. The cost comes from trade...

Terry's words, not mine. ?‍♂️ You can't seriously believe you understand the JB4 better than its inventor right? You understand the quirks related to this single platform, and withhold that info for an easy buck. Not sure why I'll even bother sharing because no one is gonna give positive...

Look man, you know very well that I have referred people to you who have no interest in learning to do it themselves. It's not like I'm trying to take your business, I'm a hobbyist. My beef is with the lack of knowledge resources to DIY. You are withholding that information from BMS themselves...

Probably going to be taking a break for a while. 3 two hour logging seshes and haven't really made any progress. Used DoE (design of experiments) to try nearly every combination of settings in reasonable ranges, and not one without throttle closures. Some worked fine for a day, but had issues...

It's the diary of a shade-tree tuner trying to figure out the trickiest JB4 B58 car ? Glad y'all appreciate it.

Lowering the FF was the wrong path. A closer look at logs show that I'm getting throttle closure due to the following: Boost is not targeting quick enough, so the JB4 sends a low boost signal to ECU (lower than it ever should - even with JB4) ECU sees the low boost and adds timing Boost kicks...

If you're running Map 1, it won't matter either way. EWG is only used for absolute maps, Map 1, 2, 3 are additive. It won't harm anything if you plug it in or don't. installing EWG will make your JB4 install take 3x time though. Just open the hood, put the keys away from the car for 10 min...

Contacted my local dealer right when the MT was announced, told them I wanted an A91-MT. They had me come in October 2022 to "order" an A91-MT. A90 Premium MT came in February 2023, and I took it at MSRP. At the time, was pretty pissed about no A91 since they led me to believe I had ordered...

Spent 2 hrs logging yesterday, definitely made some improvements. I believe I have my duty bias curve completely finished. I am consistently hitting boost targets on Map 4. Some throttle closures but nothing abrupt enough to bother me. My new issue is that the car keeps throwing a CEL for...