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Yes I have experienced this multiple times. it is NOT the rev matching or rev hang. After a hard 1-2 shift and clutch in is when it usually happens. It acts like you put the pedal to the floor in neutral. A bit unnerving. My guess is that the car is just trying to de-pressurize the charge...

Things are looking pretty normal, but need a proper log to review properly. ~3k rpm to 6500 pull in 3rd or 4th + a shift up, then let off. A pull in my car for example: https://datazap.me/u/coloneladama/log-1715607256?log=0&data=1-2-3-4-11

Looking good. Very glad to see JB4 has no issues on a stock MT.

https://www.supramkv.com/threads/supra-ultimate-jb4-guide-and-log-review-v1.20544/

AGT apparently. Must be still in development since there aren't any B58 options on their website.

I've said it before, but honestly there is little benefit in unlocking a *mostly* stock car unless you want to run heavier E blends. Unless you just hate piggybacks, just save yourself ~2k (and warranty) and go that route. Ethanol changes everything since the biggest piggyback limitation is...

Honestly with ACN91 fuel, you'll not be making much more power over stock either way. So if you are locked ECU, I'd just do the JB4 for a small power bump, since it'll be much cheaper. ~350-450 secondhand typically. If you have ethanol available, that will help make way more power. On a...

yeah I take the car places without ethanol pretty frequently. A plus of the JB4 is 5 seconds to flash between 93 and E30 on the fly. You guys have me wanting an IS38 ?

Good dyno results today for a B58 running my custom Map 6 (93 octane) ! 441whp on a mustang dyno +35whp/61wtq at +3.7psi additive. Timing starts falling apart at any higher boost levels on this fuel due to 100+ IATs...

Yeah mine is actually JB4 on E30 custom map 6. FBO IS20 still since I thought the Is38 would just be a tire destroyer ? I don't have the performance diff

I'm sure I've already posted in this thread about it, but the GTI + Supra combo is honestly perfect. MK7 GTI is insane value for money. It was nearly as fast as my stock Supra (tuned to ~320whp at 2900 lbs ?) and still fits anything I needed. Roomy, well thought out interior, 90k miles and...

https://www.jb4tech.com/forum/model-specific-engine-tuning-modification-discussion/b58-b48/836471-jb4-b58-gen2-port-injection-manifold-testing Cool news!! PI coming to JB4 for locked ECU cars! 650 whp on a hybrid turbo M340i LOCKED. Interested to see more on this.

WGDC is pegged at nearly 100% and boost is ~4 psi below target. I would say you've got a boost leak.

Nah, Meth is the additional fuel. Will reduce the DME fuel demand substantially. Trims drop a lot, which should allow you to run more boost and ethanol. I have reviewed some meth logs, but I've not custom tuned someone on it yet. Here is a 99% meth log on an M340 for example...

No worries, I think it is a valid discussion point for 2020s.

Meth gains are huge lol, like 50whp+. It would need a new tune since boost requests would be much higher when fueling or octane are no longer the bottleneck.

Fair enough. I actually like the combo of MHD BEF + JB4 custom tune for E tunes. Seems like best of both worlds. With @Phantomx car, it made like 60whp more than just MHD E40 OTS. I have another client that has a 2020, where JB4 will be more than enough to max out power on his 91 fuel, and...

What kind of power is a 2020 making on BM3/MHD on ~E20? Can't imagine its much more than 425. Guess the real benefit would be the ability to run up to E50 instead.

Either one works for JB4 as far as I can tell from the website, though it looks like CANbus is what is used for MHD or BM3 if you ever end up going a flextune with those down the line.

Very nice gains bro! 100whp with JB4 + 2 gal E is easy power. Good drivability still?