Technical Doc Race 6266 @ 20psi - Health Check
- Thread starter suspenceful
- Start date
The JB4 end is working well, need some more testers though to ensure it works across all conditions and setups.
How high of an RPM have you tested it to? There's a lot of things going on in the background when the clutch switch is activated, that I'm not sure I would feel safe removing. And I've only looked at a very small handful of the routines.
Snow has melted and I was able to test Terry's shift bog fix. All I can say is... IT WORKS! I'm thrilled.
Check out the throttle, pedal, and boost levels between the 3-4 shift.
Before:
https://datazap.me/u/suspenceful/shiftbog?log=0&data=1-4-5-9
After:
https://datazap.me/u/suspenceful/after-shift-bog-fix?log=0&data=1-4-5-9
I'm still on the OTS BMS BEF and trying to fine tune things (all JB4 bias's at 50 still). I think I'm going to gap my plugs down to 0.018" from the 0.022" they're currently at.
Check out the throttle, pedal, and boost levels between the 3-4 shift.
Before:
https://datazap.me/u/suspenceful/shiftbog?log=0&data=1-4-5-9
After:
https://datazap.me/u/suspenceful/after-shift-bog-fix?log=0&data=1-4-5-9
I'm still on the OTS BMS BEF and trying to fine tune things (all JB4 bias's at 50 still). I think I'm going to gap my plugs down to 0.018" from the 0.022" they're currently at.
Something happened that the JB4 log isn't showing... Look at your "after" log and add in ignition advance. You flatline at 0... So boost and throttle are better but you're pulling timing. This behavior isn't on your before log.
The 'before' log flatlines timing post shift, it just happens a little bit later in 4th gear (once the throttle comes back). Same concept is happening, just happens a lot faster in the 'after' log. My car has always done this.
I'm open to ideas as to why my car always pulls timing post shift. I'm thinking about going back to stock coils just to eliminate the possibility of my PR coils being wonky for some reason.
@Terry@BMS How high of an RPM have you tested it to? There's a lot of things going on in the background when the clutch switch is activated, that I'm not sure I would feel safe removing. And I've only looked at a very small handful of the routines.
I have personally tested it at 7.2k RPM on my stock motor. If I had a built motor/head I’d try 8k RPM though. What routines are we skipping through since removing if you have info to share.
Around 7000rpm. So far, so good. Haven't seen any safety compromises in logs done. If you can add a full torque limiter delete to the MHD back end flash time options that sounds great. But until then or for people who happen to be using BB this is working well.
Not to derail this thread, but since it's on the topic of shift bog, how would you know for sure that you're experiencing it? Is it a guarantee that it occurs in a 6MT car in a high rpm shift, or is it hit or miss with some vehicles and the logs must be inspected? What specifically in the log is indicative of it? Is it the throttle closure, or the flat lined timing?
Terry appears to be avoiding it by intercepting/blocking the clutch switch, but it's also been mentioned that a WOTBOX using NLS avoids it as well. Is it the combination of clutch in/lift throttle that causes it above a certain rpm, and simply removing the DME from seeing that combination (in whichever way) avoids the issue? If that's not the case, how does using a WOTBOX prevent it?
Terry appears to be avoiding it by intercepting/blocking the clutch switch, but it's also been mentioned that a WOTBOX using NLS avoids it as well. Is it the combination of clutch in/lift throttle that causes it above a certain rpm, and simply removing the DME from seeing that combination (in whichever way) avoids the issue? If that's not the case, how does using a WOTBOX prevent it?
WOTBOX would avoid it the same way the JB4 NLS would avoid it, and the same way "bog fix" within the current MHD flash time options attempts to resolve it, by preventing the engine from accelerating when the clutch pedal is pressed in. Which is one of the major triggers.
There is no torque limiter bog if using our NLS but not everyone likes NLS shifting.
There is no torque limiter bog if using our NLS but not everyone likes NLS shifting.
It's extremely slow boost recovery. You'll usually get it when you hit the redline during a shift hence why the wot box works as a band aid fix. You set the wotbox rev limiter lower then the limiter in the flash and you use the NLS. The only problem with using the wotbox is you might interrupt a charging coil.
