Car dies when shifting

[Chicken Patty]

Hello,

Recently after my install of Precision 1200cc injectors, every time I'm doing WOT pulls in my car when up shifting at about 7K RPM's when I dump the clutch again, the car is just dead. Like it hit a wall and my throttle is at 100%. Sometimes it'll pull but it'll break up a bit and then go. It's one or the other, but never both.

So far it's happened going from 2nd to 3rd. Any advise?

 

[scott90gsx420]

Is your BOV recirculated thats sounds like the issue of it shutting off during shifts.. And what do you mean braking up?? With those injectors your probably running rich and The brick wall sounds like fuel cut what are you using too tune??

 

[Chicken Patty]

Is your BOV recirculated thats sounds like the issue of it shutting off during shifts.. And what do you mean breaking up?? With those injectors your probably running rich and The brick wall sounds like fuel cut what are you using too tune??

All the answers to that are in my profile.

I'm using DSM Link V3, it's tuned, not running rich under WOT. It's not recirculated, but I'm running a GM MAF which that rules out the venting question.

By breaking up I mean when I go from 2nd to 3rd WOT, when I put it in 3rd that I dump the clutch to continue my pull it'll break up a bit and then pull fine. When it does not do that, it just doesn't do anything. Throttle all the way down and the car is not pulling, nothing, like if I was on idle, only that my foot is all the way down and the car is in gear.

 

[scott90gsx420]

Ok well do the rpms shoot up when you punch it and the car doesn't go anywhere??

 

[Chicken Patty]

Ok well do the rpms shoot up when you punch it and the car doesn't go anywhere??

If I'm doing a 2nd and 3rd gear pull everything is fine, I punch it, car pulls perfect, all good.

When I clutch and throw 3rd, when I put the gear in and let go of the clutch again while already in 3rd gear to cointinue my pull when I let go of the clutch, the car just doesn't do anything, stays blank. RPMS are where they would be in the next gear, but no pull, no sputter, no nothing, engine on but it's like if I'm not on the gas.

 

[scott90gsx420]

HHHmmmm.. Thats crazy ive never heard of this.. Sound like the car doesn't know what to do on that particular load.. Maby try skipping the gear it does it in and go to the next gear and see if it keeps pulling then...
Maby a ECU issues look for burnt caps.. Thats really the only thing i could think of other then a dsmlink setting being off but i don't have dsmlink so i don't know on that either..

 

[1997_GSX]

When all else fails post a log!

 

[scott90gsx420]

^^Lol well thats a really good idea now i feel like a tard

 

[Chicken Patty]

When all else fails post a log!

I'll get one tonight, I was done tuning when it started doing this. Pulls perfectly fine. Then it starts doing this between shifts. For some reason I think it's the NLTS.

 

[Chicken Patty]

Alright guys, as I was logging the car to post the log for you'll, I made a few adjustments and now the problem is fixed.

When I was tuning the car, doing 3rd gear pulls. The MAF RAW would go over 2700 Hz at about 5700 RPM's. Of course at that point I set the clamp and adjusted the VE tables from 5.5k and up.

However, since I am using NLTS, I guess that shifting while not letting any boost out of the system when the RPM's dropped to about 5k or so, maybe it was trying to interpolate settings from the 5k to 5.5k settings. So obviously at this point since the 5k setting was still by default that caused the car to richen out a lot causing the break up.

All it took was adjusting the 5k setting accordingly and now the car is pulling great gear after gear.