question for those that have FI

phunk

Skipping gears is hell on your synchros. It worked before because they were fresh, it doesnt work now because you are wearing them out. Pretty soon you will have trouble shifting into 6th at all without double clutching. Many dealers will reject warrenty replacement of transmission with synchros problems if they find you skip shift gears... they would know because someone might complain that they are no longer able to do so, or they will ask you to take them on a drive to show them the problem, but they are also observing how you drive.

If you are hell-bent on continuing to skip shift 3rd to 6th, instead of depending on whats probably a single brass synchro for 6th to slow the mainshaft down by so much for such a change in ratios, just double clutch it and you are removing most the burden of the synchros. double clutching takes more time but if your skipping 3-6 then you arent racing anyway.

ALSO i would like to add that I am not a transmission builder, so my terminology shouldnt be quoted or used for debate and i will gladly take a seat on this topic to a transmission expert... i am just explaining it the best that I can based on the little i know about one aspect of cars/performance that i have rather avoided learning the deep inner-workings of.

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m4a1mustang

If skipping shifts was so bad on your synchros then manufacturers wouldn't force features like "skip-shift" that make you go from 1-4 in easy driving.

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- Steve

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phunk

You are ignoring the many separations in the scenarios. High torque large displacement vehicles use a 1-4 skip shift solenoid for gas mileage only. The skip shift solenoid engages at low load and low rpm only, and the speed changes are less drastic. 3-6 is a taller shift and the OP is shifting out at a pretty high rpm and probably not waiting for the engine speed to come all the way down either. Not to mention lower gears use more robust double or triple synchros depending on exactly which transmission and gear. 6th is a single for pretty much every trans. There is a reason his 6th gear is not continuing to allow it... And when something performs worse over time in a vehicle, that is due to wear.... And I guarantee you that wear is in the transmission... Not a side effect of turbos or anything.

Btw I skip shift pretty often myself. I wait for the engine speed to come down before attempting. To do so should help a lot versus shifting it at a "normal" rate. It had never destroyed a trans on me but my 350z did eventually become rather difficult to get into 6th without perfect timing.. But it was 5th that really got beat up because that's the gear I usually skip shift into if I'm going to skip. 5th gear synchros pretty much toast in my 350z by the time I sold it this year.

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