Power lag between shifting (Manual)

cowgirljeeper

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Different tire size between the 2? Totally different great ratios in this transmission as well.
no, both had/have 33's and i have noticed that. JL has more pick-up than the JK did so that's what threw me off w/having to downshift so far. but not too worried about, just downshift and go on.





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jdubya421

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Just look at the gear ratios:
1st: 5.13
2nd: 2.63
3rd: 1.53
4th: 1
5th 0.81
6th: 0.72

There is a big difference between 1st and 2nd and a decent different between 2nd and 3rd. The shift from 1st to second takes a second for the revs to drop and match. Look at your tach when you shift, it drops like 2.5k RPMS. I shift out of first around 3-3.5k RPM and I always make sure to leave the foot on the gas for an extra *fraction* of a second (from 1st to 2nd) and get good shifts and a minimal loss in power. You are definitely going to feel the power drop in 4th because its your 1:1 ratio and 5th/6th are overdrive gears. It really helps to have the grab point down well. In mine the grab point is pretty early on the throw and if you can sync up your feet and right hand you will have minimal time during shifts and minimal power loss.
 

Maverick909

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we all have this problem. you have to rev up to 3200-3500 rpm between shifts. i am currently working on re-gearing my 3.43 sport gears to 4.10s or 4.56 gear which will help.
 

daveprice7

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I seem to be having kinda the opposite of what you're experiencing. With my foot off the gas, when I depress the clutch, RPMs jump for a second on their own... how much it jumps seem to depend on my rolling speed. It makes it pretty easy to shift. I figured it was some kind of idiot-mode FCA put into their manuals (or one of their "fixes" [hacks] done in response to complaints). I also notice that I never really slow down past a point when in gear; like I'm in some sort of low-speed cruise control/anti-stall. Could just be some different revision of programming I suppose.
 

vavaroutsos

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I seem to be having kinda the opposite of what you're experiencing. With my foot off the gas, when I depress the clutch, RPMs jump for a second on their own... how much it jumps seem to depend on my rolling speed. It makes it pretty easy to shift. I figured it was some kind of idiot-mode FCA put into their manuals (or one of their "fixes" [hacks] done in response to complaints). I also notice that I never really slow down past a point when in gear; like I'm in some sort of low-speed cruise control/anti-stall. Could just be some different revision of programming I suppose.
The OEM tune definitely has rev hang. I personally find it annoying as I like to manage my rev matching and the rev hang slows my shifts if I want to rev match. Double clutching seems to help the revs drop quicker, but I the need for that went out with synchronizers.

Engine breaking seems to be limited below 2K RPMs. If you watch the real time MPG display you can see it seems like the ECU is fueling the engine below 2K RPM even though you aren't touching the gas pedal. Above 2K RPM my MPG goes to 99 and I can hear a difference in engine fueling (I don't have the OEM muffler so it's a bit easier to hear).
 

dabial

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Hey Dabial, how ya been? i really first noticed it when on my usual route to work a certain hill that I had to downshift from 6th to 5th in my JKU i now have to basically go down to 3rd to pull the same hill in my JLU.
Other then that you loving it???
 

jdubya421

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I seem to be having kinda the opposite of what you're experiencing. With my foot off the gas, when I depress the clutch, RPMs jump for a second on their own... how much it jumps seem to depend on my rolling speed. It makes it pretty easy to shift. I figured it was some kind of idiot-mode FCA put into their manuals (or one of their "fixes" [hacks] done in response to complaints). I also notice that I never really slow down past a point when in gear; like I'm in some sort of low-speed cruise control/anti-stall. Could just be some different revision of programming I suppose.
The tune definitely has rev hang and it does bump the RPMs a bit. It is really noticeable when you over-blip for a downshift. The computer definitely helps you blip, but if you over do it then the revs just hang foreverrrr. I don't seem to notice the "low speed cruise" like you describe.
 

snowtx1

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I have the same issue with no torque below 2,000 RPMs. You just have to rev it hard to keep it in the power band. I also agree that the rev hang is really annoying.
 

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