Jakes 80e 1-2 Shift
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08-13-2013, 07:42 AM
#8
3400 FTI triple disk and the tuner took a ton of line pressure out but did not affect shift quality so we are assuming its a mechanical issue.
I just got the car back from first dyno tune yesterday evening and will be putting some miles on it, so I can try to get a video.
I just got the car back from first dyno tune yesterday evening and will be putting some miles on it, so I can try to get a video.
08-13-2013, 03:47 PM
#12
Our 4L80E with the D1 transbrake is very firm on the 1-2 shift.
We use the same calibration on some units without the transbrake depending on power level.
Without a transbrake or with the D3 transbrake we can soften the hit a bit depending on customer need.
You don't want a too hard 1-2 shift as it shocks the sprag, too soft and it wears the clutches. I had some concerns about sprag life with the D1 calibration in the beginning but that design has been on the market for almost 4 years and we've had very few sprag failures. So it seems to be "safe" but I do agree it is VERY firm. With a low stall converter it is harsh.
We use the same calibration on some units without the transbrake depending on power level.
Without a transbrake or with the D3 transbrake we can soften the hit a bit depending on customer need.
You don't want a too hard 1-2 shift as it shocks the sprag, too soft and it wears the clutches. I had some concerns about sprag life with the D1 calibration in the beginning but that design has been on the market for almost 4 years and we've had very few sprag failures. So it seems to be "safe" but I do agree it is VERY firm. With a low stall converter it is harsh.
08-13-2013, 10:50 PM
#13
3400 FTI triple disk and the tuner took a ton of line pressure out but did not affect shift quality so we are assuming its a mechanical issue.
I just got the car back from first dyno tune yesterday evening and will be putting some miles on it, so I can try to get a video.
I just got the car back from first dyno tune yesterday evening and will be putting some miles on it, so I can try to get a video.
Doesnt matter what you tune it to, the line pressure is a mechanical function with his modified valve body.
I can take a video of my 1-4 in town if you'd like, you'd be amazed what the big converter does for it. The only harsh thing is the converter lockup (multi disk goodness)
08-13-2013, 11:53 PM
#14
Doesnt matter what you tune it to, the line pressure is a mechanical function with his modified valve body.
I can take a video of my 1-4 in town if you'd like, you'd be amazed what the big converter does for it. The only harsh thing is the converter lockup (multi disk goodness)
I can take a video of my 1-4 in town if you'd like, you'd be amazed what the big converter does for it. The only harsh thing is the converter lockup (multi disk goodness)
08-14-2013, 08:45 AM
#16
Our 4L80E with the D1 transbrake is very firm on the 1-2 shift.
We use the same calibration on some units without the transbrake depending on power level.
Without a transbrake or with the D3 transbrake we can soften the hit a bit depending on customer need.
You don't want a too hard 1-2 shift as it shocks the sprag, too soft and it wears the clutches. I had some concerns about sprag life with the D1 calibration in the beginning but that design has been on the market for almost 4 years and we've had very few sprag failures. So it seems to be "safe" but I do agree it is VERY firm. With a low stall converter it is harsh.
We use the same calibration on some units without the transbrake depending on power level.
Without a transbrake or with the D3 transbrake we can soften the hit a bit depending on customer need.
You don't want a too hard 1-2 shift as it shocks the sprag, too soft and it wears the clutches. I had some concerns about sprag life with the D1 calibration in the beginning but that design has been on the market for almost 4 years and we've had very few sprag failures. So it seems to be "safe" but I do agree it is VERY firm. With a low stall converter it is harsh.
Well, that works for me!
Was more worried bout it being NOT how you guys want them to be and having something broken etc. I will tell my passengers to deal and or, avoid driving in the rain on slicks.
08-20-2013, 03:31 PM
#19
Part throttle it doesnt really go past 3k. Cruises at 2600-2800 unlocked, and 14-1500rpm locked up in town. Mash the gas and it instantly stalls to 52 then the tires break loose and it will sit on the limiter.
This is with a 275/60/15 ET Radial PRO, too. Converter is magical.
This is with a 275/60/15 ET Radial PRO, too. Converter is magical.
