Here’s some info I found about running in OD while Drag Racing.
11-25-2006, 09:22 PM
#21
Because of oft-repeated claims that doing certain things (WOT 4-2 downshifts, manual shifting) were potentially catastrophic to the 4L60e, I've followed and participated in these discussions to learn more about the inner workings of our trannies in order to identify effective and efficient shift practices.
I think a lot of the myths have been put to rest. But I'm afraid that now we're going in the opposite direction - splitting hairs in the search for the ultimate pressure pattern, and ending up with exotic shift practices that are not really going to make much of a difference to tranny life and health.
I think a lot of the myths have been put to rest. But I'm afraid that now we're going in the opposite direction - splitting hairs in the search for the ultimate pressure pattern, and ending up with exotic shift practices that are not really going to make much of a difference to tranny life and health.
11-25-2006, 09:49 PM
#23
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Originally Posted by RevGTO
Because of oft-repeated claims that doing certain things (WOT 4-2 downshifts, manual shifting) were potentially catastrophic to the 4L60e, I've followed and participated in these discussions to learn more about the inner workings of our trannies in order to identify effective and efficient shift practices.
I think a lot of the myths have been put to rest. But I'm afraid that now we're going in the opposite direction - splitting hairs in the search for the ultimate pressure pattern, and ending up with exotic shift practices that are not really going to make much of a difference to tranny life and health.
I think a lot of the myths have been put to rest. But I'm afraid that now we're going in the opposite direction - splitting hairs in the search for the ultimate pressure pattern, and ending up with exotic shift practices that are not really going to make much of a difference to tranny life and health.
I think just leaving it in OD for everything will be perfectly fine, and not cause any significantly extra wear during any sort of WOT shifting over using 3rd or anything else.
Originally Posted by performabuilt
this is true the only move i dont suggest is wot 2-3 in drive
Last edited by RPM WS6; 11-25-2006 at 09:57 PM.
11-25-2006, 10:08 PM
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Originally Posted by BlackHawk T/A
One thing you could do is bring it down to 3 to get out of overdrive, and when you go WOT bump it back up one notch. It won't shift but it will take you out of manual 3 which was used only to bring you down one gear.
11-25-2006, 10:17 PM
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Originally Posted by BlackHawk T/A
So this is basically what you are saying?
11-25-2006, 10:25 PM
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Originally Posted by performabuilt
NO way you shift is harmfull except that on the 2-3 shift in the D position the line drops with could affect the life of the 3-4 clutch , Maybe .
Downshifts pose no problem from or to any gear,
Downshifts pose no problem from or to any gear,
Makes life real simple.
11-26-2006, 01:14 AM
#30
Originally Posted by performabuilt
this is true the only move i dont suggest is wot 2-3 in drive
I've done the 2-3 upshift in drive in my Z28 more times than you have posts (and over 7 years now), spraying through the shift. No problems.
I've done the same with my TA, on nearly a daily basis for over a year now, and again, spraying through many of those shifts. No problems.
11-26-2006, 01:21 AM
#32
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Originally Posted by performabuilt
NO way you shift is harmfull except that on the 2-3 shift in the D position the line drops with could affect the life of the 3-4 clutch , Maybe .
Downshifts pose no problem from or to any gear,
Downshifts pose no problem from or to any gear,
I’ll drive it in D for short trips.
I’ll drive it in OD for cruises.
I’ll launch it in D and bump it into OD after the 1-2 shift at the Drag Strip.
Now I know everything to do to prolong the life of my trans, thanks guys!
BTW, will that B&M Deep Trans Pan help cool my transmission off?
11-27-2006, 08:03 PM
#36
Drag racing in the D range is fine with us!! Just as you guys had it all figured out I thought I would throw my .2 cents in this one, just to clear things up far as our customers transmissions are concerned. With all of our performance built 4L60E transmissions I let the customer decide weather they want to drag race in the OD or D range, it doesn't matter to me either way. Depending on what gear ratio your running ( 2.73 ) for example it's never going to see 4th gear at the track so leaving it in OD is fine. Now for the guy with a ( 3.73 or 4.11 ) that doesn't want to see 4th gear, leaving it in the D range is fine with me too. Now for the proof that you CAN with a proper built transmission. The C-5 Corvette that's on our web page makes 750ish at the (Tires) raced all season locally running mostly 9.70's - 9.80's along with the brutal 1500 mile road trip/drag race ( Hot Rod Magazine's Drag Week Event ) which will be in this January's issue running our extreme duty 4L65E. The only way this car has ever gone down the track the last three years is with the shifter in the D range being shifted @ 6700rpm. To date this season the trans is still doing great and has well over 100 passes on it. And in case your wondering, it does get freshened up yearly as it should with that kind of H/P. If you guys are burning up 3-4 clutches in the D range then you have a problem in the overrun clutch circuit. I check every one on the dyno before it leaves here and I don't see anything but the normal 5-10 psi momentary drop in the line pressure gauge during the upshift in D or OD range. So again, feel free to race in the D range at the track with our transmissions, it's ok with me. 
Now look what I started!!
Now look what I started!!
Last edited by FLT; 11-29-2006 at 12:08 AM.
11-27-2006, 08:20 PM
#37
my head is spinning... Can we manually shift 1-2, 2-3 at the track , or is that "bad" as well?? that's the only thing I want to know..cause my tuner can't get my shift points "Exactly" where I want them, so I do it my own way, unless I shouldn't anymore?
11-27-2006, 08:57 PM
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Originally Posted by TonyGXP
my head is spinning... Can we manually shift 1-2, 2-3 at the track , or is that "bad" as well?? that's the only thing I want to know..cause my tuner can't get my shift points "Exactly" where I want them, so I do it my own way, unless I shouldn't anymore?
The problem is, it won't shift right when you tell it to.
11-27-2006, 09:08 PM
#40
I agree with Vince , With a well built transmission you can do it either way and its fine , But that wasnt actually the question, The question was which is better for the trans and that question must include stock unbuilt 4L60Es too and in that case not allowing the 2-3 upshift to happen in the D position is a good idea since its verified fact the apply presure Is lower on the 2-3 shift in D than in OD ,
As for built units such as ours or even theres shifting from 2-3 in D is not and issue,
I was addressing the question for all 4L60E and 700R4 transmissions in general .
Personally though if the shift timing (tuning)is correct its probably best and surley more consistant to just leave the trans in OD on the track
As for built units such as ours or even theres shifting from 2-3 in D is not and issue,
I was addressing the question for all 4L60E and 700R4 transmissions in general .
Personally though if the shift timing (tuning)is correct its probably best and surley more consistant to just leave the trans in OD on the track
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