Peak torque is like 3500-4500rpm depending on tune.
I know how LC works on manuals and DCT but how would it work with a converter. Set limiter in 1st while braking to stall speed so you can just keep it floored? How would this build more boost as apposed to just modulating throttle to keep it at stall speed manually yourself? LC seems like more of a consistent convenience as apposed to an actual improvement. And seems in either case a high stall 3400ish converter would do wonders.
Your times are super impressive. Your build gives some of us something to look towards. 👍🏼
If you're familiar with a 2 step rev limiter, it doesn't just limit rpm, it usually intermittently cuts spark to each cylinder. This allows unburnt fuel into the hotside of the turbo which spools the turbo. You can build 5,10,20, 30 psi depending on the platform and the setup. It also can advance or retard timing to assist in building the boost. Usually it's retarded for a manual and advanced for an auto. Think of this as a lean spool mode that the VR30 uses but you're not moving and have an intermittent spark cut. If you had this feature you wouldn't need a torque converter at all to cut some wicked times. If I had more free time is start looking over the schematic to see if I could build a momentary spark cut off the ignition harness....just too busy unfortunately. It would really put us WMI JB4 users on par with tuned cars.
mid you lookat both passes the real reason that makes 3mph difference in the trap speed is that I lost power during 1st one at top of 4th and had to shift into5th. You can hear it in the video as well, that is not because of the slope.
I used to leave at 15 psi consistently when I was on stock turbos. My RWD friends tuned by ams do 10 psi with a really good lc that one ran 10.90 on the street with stock diff
On another platform I couldn't get better than mid 12s in a stick shift turbo car. Put a tire on it and went high 11s. Put a 2 step on it and went mid to high 10s 🤣 2 steps/launch modes rule! I have no doubt if I could leave on 10 pounds my JB4 car would run a bottom 11.
That's what I've been bugging Terry about. We need a form of launch mode or a 2 step. I can deadhook 1st with my LSD upgrade on my drag radials, but can only leave in may 1-2 psi of boost.
Did I see something on the Dragy that you cut a 4.0 0-60?
Mikhail
Yeah my best is 4.08 when I was still getting dialed in this past summer. That was the only time I had a sub 2 second 60ft. Ran 12.10 on that run in 2300+ DA
Congrats on the 0-60! The Dragy app showed you were JB4 so I was scratching my head but it makes sense now.
Yea it captures the moment in time and I hadn't updated it at that point, I never surpassed that 4.46 on JB4, not even close hahCongrats on the 0-60! The Dragy app showed you were JB4 so I was scratching my head but it makes sense now.
Any luck with this? I'm admittedly ignorant on how a 2 step rev limiter works other than what you describe above. Is this how EcuTek tune effectively operates to reduce turbo lag/spool-up time on launch (if not, how?)? I'm AWD and basically looking for boost/power on demand without brake boosting or messing around with a complicated launch control procedure. Right now boost doesn't hit target until 3,500-3,800RPM or so (no brake boost). Current mods are just JB4 w/ FW+EWG and HKS LDPs, but have FI CBE on order and have inquiries into dealerships/vendors on AMS/Infiniti HX, expansion tank, intakes. From there make a decision on EcuTek or stick w/ JB4, possibly add WMI to JB4 (thanks to all the pioneering work of Ddnspider on the WMI, I MAY be brave enough to attempt!). Thanks everyone.
Thanks. Just posted on n54 quoting you. Feel free to add on. Seems like something BMS could address, especially with EWGs? If not I may take the plunge to EcuTek.
