Lock up switch
Thread Starter
Teching In
Joined: Nov 2001
Posts: 24
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From: palatine,IL USA
Lock up switch I've had a lock up switch on my car for almost a year and every time I try it at the track I lose about 2 mph. I hit the switch in second gear, am I hitting it too early. I'm using a Vigilante 3200 converter, and I'm happy with my mph. However, I'll take more if I can get more.
Re: Lock up switch Try it in 3rd, just about 5000 (95 mph or so), some guys go to 5500 if they have a real high shift point.
Caution: If you don't have enough gear to run high in your rpm band through the traps, then you'll probably loose mile an hour!
Example: My stroker go's through the traps at 6000+. If I lock up the converter I gain 1 tenth and 1 mile an hour. If I had taller gearing then I would kill shift extension by locking up the converter, to early (while it's still in the extension). Each combo is different, gear, hp, torque converter stall/extension and weight are some of the veritables.
Jim <img src="graemlins/fluffy.gif" border="0" alt="[Fluffy]" />
Caution: If you don't have enough gear to run high in your rpm band through the traps, then you'll probably loose mile an hour!
Example: My stroker go's through the traps at 6000+. If I lock up the converter I gain 1 tenth and 1 mile an hour. If I had taller gearing then I would kill shift extension by locking up the converter, to early (while it's still in the extension). Each combo is different, gear, hp, torque converter stall/extension and weight are some of the veritables.
Jim <img src="graemlins/fluffy.gif" border="0" alt="[Fluffy]" />
TECH Junkie
Joined: Nov 2001
Posts: 3,987
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From: Melbourne, FL
Re: Lock up switch I always got the best results manually locking my converter @ around 5000-5500 rpm or so in 3rd gear... I wouldn't manually lock the converter in 2nd. I would think that would almost bog the engine down when it made the 2-3 shift.
On The Tree
Joined: Nov 2001
Posts: 108
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Re: Lock up switch yup, I have had mine and I have used it a couple of times on the street. i lock it up in 3rd around 5,000 rpm's. I wonder how I will fair at the track with the 3.73's and the moser 12 bolt. <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />
Re: Lock up switch hey that's funny, cdm98z28...
my name is Christopher Daniel Minnich and i own a '98 z28. you copying me? anyways, to help you out...
i was going 12.8's at 104mph, but when i lock it up at 5200 about(on the stock tach) in 3rd gear, i gained 2 tenths. went down to 12.6 @ 106mph, same day, one run after the other. good luck and hope this helps. i think that when you shift into third, the engine is bogging down with the low rpms from the gear drop.
Chris
[ November 24, 2001: Message edited by: z28kid98 ]</p>
my name is Christopher Daniel Minnich and i own a '98 z28. you copying me? anyways, to help you out...
i was going 12.8's at 104mph, but when i lock it up at 5200 about(on the stock tach) in 3rd gear, i gained 2 tenths. went down to 12.6 @ 106mph, same day, one run after the other. good luck and hope this helps. i think that when you shift into third, the engine is bogging down with the low rpms from the gear drop.
Chris
[ November 24, 2001: Message edited by: z28kid98 ]</p>
TECH Enthusiast
Joined: Nov 2001
Posts: 699
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From: Maryland
Re: Lock up switch As said above, don't lock it until the top of 3rd. I've never locked mine at the track, except when I hit the switch by accident and made a full run locked, start to finish <img src="images/icons/shocked.gif" border="0"> <img src="images/icons/shocked.gif" border="0">
No wonder my trans is slipping!!
No wonder my trans is slipping!!
Thread Starter
Teching In
Joined: Nov 2001
Posts: 24
Likes: 0
From: palatine,IL USA
Re: Lock up switch Thanks for the replies. The car did seem to bog down slightly when it shifted 2-3. It just seems to me that locking up at 5000-5200 in third is so close to the end of the run, that gains would be minimal. I've heard of so many people getting .1-.2 sec and 1-2 mph, hopefully I'll be one of them once I try locking it later than I have been.
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