built 4l60e with yank ss3200 question.
built 4l60e with yank ss3200 question. Will footbraking an untuned 60e with a conveter throw the trans into limp mode? If so can this be taken care of with hp tuners?
Thanks
Ryan
Thanks
Ryan
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
I've never personally seen this happen, but anytime the rpms do not match what the computer thinks they should be, a limp mode can be triggered. A bigger converter can usually trigger this on an untuned setup.
Thanks guys, Im hoping hp tuners will take care of the issue. The trans is a probuilt auto ss (kit) built by a respected local builder. With the yank ss 3200. Trans had approx. 450 miles on it before a red light footbrake took place after that it was hard to leave off the line felt like brakes were being applied but you can manually downshift and take off and upshift through all gears. I removed the trans again had the builder go back through it he said just some burnt overrun cluthes then when reinstalled it did the exact same thing right off the jackstands. Thanks again for the info
Ryan
Ryan
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
If you turn the car off, wait a few seconds, and restart, the condition should go away. I use to get a 2/3 shift solenoid failure code when I went to a Yank 4k. What would happen was the 2/3 shift would be commanded at a lower throttle position, the shift would take place, and then directly after I would apply more throttle to keep the car accelerating. This would cause the rpms to stay the same as before the shift took place. The computer sees this as the shift did not take place, meaning the transmission is broken so it gives you a limp mode condition. Once I figured out the how and why, I could throw it into that condition at will, and on the same token, I could avoid it. As long as you allowed the rpms to drop accordingly for a short period of time after a shift, the computer saw no fault, then you could apply whatever throttle you liked. I disabled the corresponding 2/3 solenoid code in the tune and it does not check for this failure anymore, leaving me limp free......
