Btr 4 Speed Tripping Out

[straughsberry]

+1 for high line pressures.

I had the same problem after getting my BTR built. Valve body was not modified. Line pressures in the tune had been modified for the stock box and with the new box, line pressures were increased. It began to take off in second 30%-40% of the time. We turned down line pressures in the box until it went away. On the very odd occasion, it will still take off in second.

[turbotrana]

Are you guys talking about reducing the pressure of the s5 solenoid by turning it down or

reducing the spring pressure of the main pressure relief valve in the valve body by removing the extra shims installed when it was modded

[straughsberry]

For me, reducing the pressure of the s5 solenoid by turning it down. I think the combination of increased line pressure in the tune and s5 was causing it to take off in second. Slight turn down of the S5 pretty much fixed it for me. My box shifts firmer in tippy than in D as line pressures in tune are higher in tippy. So when I'm playing, I only play in tippy.

[CCCC]

+1 for high line pressures.

I had the same problem after getting my BTR built. Valve body was not modified. Line pressures in the tune had been modified for the stock box and with the new box, line pressures were increased. It began to take off in second 30%-40% of the time. We turned down line pressures in the box until it went away. On the very odd occasion, it will still take off in second.

Hi straughsberry, my transmission builder turned down the line presures back to standard an we still had the same out come,right now im thinking to replace my tps sensor, voltage sensor, to see if it may make a difference, as this is known to happen when a voltage sensor is faulty, acording to my workshop manual.

Edited 24/02/11 11:17 AM by CCCC

[spoolxr6]

If you have an xcal 2/3 run a diagnostic to c if it has logged any faults electronically.

[CCCC]

Hi mate, yea iv all ready tryed with the xcal, an it didnt record any faults, then an other bloke used his scanner an the only thing it recorded was seatbelts, it looks like its going to be a pain in the ass now for me trying to solve this drama,I might get a tuner to adjust the line pressures on the computer lower to see if that can make a change.

I dont understand why but it gets all gears while I use the tip control, but soon as I push it in drive,it takes off in second.

[ratter]

one of the ones we saw, we put everything auto back to stock and it still did it until the auto guy rectified the auto itself.

[CCCC]

one of the ones we saw, we put everything auto back to stock and it still did it until the auto guy rectified the auto itself.

Hi ratter, yesterday we put the standard tune back in the car, an it didnt change a thing, would you know if the cruise control an my back brake lights would have anything to do with how my gearbox is behaving, they seem to have a mind of its own, because they work sometimes, an then they stop working.

Another thing ratter with the cars that you have seen with the similar dramas that my gearbox is doing, did they have all gears from 1 to 4 in tiptronic mode, or did they miss first gear?

If I cant sort this problem,do you thing the next best thing to do would be changing the valve body to standard to see what happens?

thanks for your help ratter

[icer]

yes. remove the valve body and put a stock one back in. I still think you have a manualized valve body that's causing the issue.

[spoolxr6]

This cruise issue and back brakes sounds like its in the Tune. Have you contacted CV yet?