going to the track leave it in D or 3rd?????
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Joined: Nov 2013
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From: upstate ny
going to the track leave it in D or 3rd????? Just as title says. Let me know your thoughts? And plz explain what the difference is? I have 3:23 I'm not gonna run out by end of track in 3rd? Thx
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From: Ann Arbor, MI
Its been covered in detail as here:
https://ls1tech.com/forums/automatic...-drive-od.html
In short, with a stock trans keep it in [OD].
Reason - in [D3] during the 2-3 shift the overrun clutches are also applied, bleeding pressure from the 3/4 clutch at a critical time.
The Sonnax 2-3 HD shift valve is a nice upgrade that strengthens the trans in [D3], but is non-trivial to install.
https://ls1tech.com/forums/automatic...-drive-od.html
In short, with a stock trans keep it in [OD].
Reason - in [D3] during the 2-3 shift the overrun clutches are also applied, bleeding pressure from the 3/4 clutch at a critical time.
The Sonnax 2-3 HD shift valve is a nice upgrade that strengthens the trans in [D3], but is non-trivial to install.
Thread Starter
TECH Enthusiast
Joined: Nov 2013
Posts: 629
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From: upstate ny
I googled searched it to lol. I must of not worded it right. Thx for the link! So what does all that mean? That link didn't really answer my question lol
Last edited by ironmikektm525; May 17, 2014 at 09:42 PM.
Joined: Aug 2007
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From: Turnin' Wrenches Infractions: 005
I prefer D myself (always have). My trans builder agrees. I've never had or seen a 4l60e failure personally by someone using D at the track. And no you won't need 4th gear at the track.
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Its been covered in detail as here:
https://ls1tech.com/forums/automatic...-drive-od.html
In short, with a stock trans keep it in [OD].
Reason - in [D3] during the 2-3 shift the overrun clutches are also applied, bleeding pressure from the 3/4 clutch at a critical time.
The Sonnax 2-3 HD shift valve is a nice upgrade that strengthens the trans in [D3], but is non-trivial to install.
https://ls1tech.com/forums/automatic...-drive-od.html
In short, with a stock trans keep it in [OD].
Reason - in [D3] during the 2-3 shift the overrun clutches are also applied, bleeding pressure from the 3/4 clutch at a critical time.
The Sonnax 2-3 HD shift valve is a nice upgrade that strengthens the trans in [D3], but is non-trivial to install.
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Verdad Gallardo Moderator
Joined: Aug 2010
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From: Ann Arbor, MI
In post #4 I mention that my suggestion only applies to the 4L60E. The 4L80E is completely different and I cannot answer that.
OP: You are over-worrying. In "theory" racing in [D3] may cause the 3/4 clutch to slip/wear a tiny bit more than in [OD] with a stock trans. Since zillions of people race in [D3], as 01ssreda4 points out, the difference is negligible. Note that a performance built trans will have higher pressure and faster engagement of the 3/4 clutch, making it a mute point.
OP: You are over-worrying. In "theory" racing in [D3] may cause the 3/4 clutch to slip/wear a tiny bit more than in [OD] with a stock trans. Since zillions of people race in [D3], as 01ssreda4 points out, the difference is negligible. Note that a performance built trans will have higher pressure and faster engagement of the 3/4 clutch, making it a mute point.
It is worth noting if the trans has a lot of miles/wear, racing in 3 instead of OD may begin to allow a slip on the 2-3 shift which will further increase wear and cause the car to hit the rev limit instead of completing the shift. I had this issue until I installed the HD 2-3 shift valve mrvedit mentioned
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Joined: Jun 2007
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From: Westminster, MD
I posted a similar thread a while ago, my responses IIRC, were mostly put it in D instead of OD, although, I did specify that my trans was tuned (still stock other than converter). But for more reference material....
https://ls1tech.com/forums/drag-raci...ip-newbie.html
and then more street oriented...
https://ls1tech.com/forums/automatic...ting-auto.html
https://ls1tech.com/forums/drag-raci...ip-newbie.html
and then more street oriented...
https://ls1tech.com/forums/automatic...ting-auto.html
When I tried doing the burnout in OD or 3rd the engine would begin to lug since it upshifts, hence automatic trans. Holding it in 2nd allows me to regulate the throttle better.
Stock engine and trans with 100+K and used as my bracket car. At the end of season, if I keep the car, will be contacting Jake's for a proper build.
Stock engine and trans with 100+K and used as my bracket car. At the end of season, if I keep the car, will be contacting Jake's for a proper build.
Joined: Nov 2003
Posts: 6,216
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From: Wichita KS / Rancho San Diego
I always start my burnout in 1st and upshift to 2nd during it. Gets the tires spinning faster more quickly with less chance for wheelhop. I've heard people say not to but I've yet to hear a convincing reason why it would be bad for the trans.
I can't see any reason for running in 3rd at the track. The car won't shift into 4th at WOT anyway. Why not have every bit of pressure possible going to the (weak) 3-4 clutch pack?
I can't see any reason for running in 3rd at the track. The car won't shift into 4th at WOT anyway. Why not have every bit of pressure possible going to the (weak) 3-4 clutch pack?
Ditto on the burnout. The Vette has too good of rear brakes to use second only as I don't have a line lock. Well, I have one, just never installed it......
The stupid vette also has electronic throttle and traction control. Of course I turn the TC off, have deleted all the abuse stuff, but something in that system still gets pissed off and takes throttle away on occasion during the burnout.
I have a PB level 2 trans, and have no clue if it has the Sonnex valve in it. So I race in D4 (OD to you Camaro guys)
Well over 150 passes over the last two years searching for that elusive 10.99, and the trans works as well as it did when I put it in.
Ron
The stupid vette also has electronic throttle and traction control. Of course I turn the TC off, have deleted all the abuse stuff, but something in that system still gets pissed off and takes throttle away on occasion during the burnout.
I have a PB level 2 trans, and have no clue if it has the Sonnex valve in it. So I race in D4 (OD to you Camaro guys)
Well over 150 passes over the last two years searching for that elusive 10.99, and the trans works as well as it did when I put it in.
Ron