4th gear in the half mile on a turbo 5.3?
04-23-2014, 10:28 AM
#1
4th gear in the half mile on a turbo 5.3? Looking for some opinions in this one. I have a built 4l80 by Jake's and wondering if it would hold if I shifted into 4th at wot for a 1/2 mile event. I know 4th can be a weak point, but wondering if the trans being built will help. Car is probably in the 700 hp range if I had to guess. Trans is a stage 2 Jake's (entry level one).
Last edited by Sarg; 04-23-2014 at 12:52 PM.
04-23-2014, 11:20 AM
#5
Im sure quite some people have done it, but before thinking about doing that contact Jake's and get with whom built it. They shoulf be able to tell you if the transmission is built and capable to do that 4th gear shift at WOT.
Different subject but good example is shifting back into Neutral after a 1/8,1/4,1/2 or a mile pass, some transmissions will literally puke if shifting into neutral occurs at a high certain speed. That specific mistake can cause you a new tranny, thats why its always good to ask the builder before doing soo.
Different subject but good example is shifting back into Neutral after a 1/8,1/4,1/2 or a mile pass, some transmissions will literally puke if shifting into neutral occurs at a high certain speed. That specific mistake can cause you a new tranny, thats why its always good to ask the builder before doing soo.
04-23-2014, 11:21 AM
#6
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I did the Chicago half mile last year and my trans had no issue going into OD wot. I called jake to ask him and he told me it'll take it no problem. It's a stage 5 and on medium boost I was probably around 650whp at the time.
I was nervous that I was going to **** a trans going into OD but it took it like a champ
skip to 1:00 in to see the 1/2mile pass
I was nervous that I was going to **** a trans going into OD but it took it like a champ
skip to 1:00 in to see the 1/2mile pass
Last edited by willizm; 04-23-2014 at 11:30 AM.
04-23-2014, 11:29 AM
#7
I did the Chicago half mile last year and my trans had no issue going into OD wot. I called jake to ask him and he told me it'll take it no problem. It's a stage 5 and on medium boost I was probably around 650whp at the time.
I was nervous that I was going to **** a trans going into OD but it took it like a champ
I was nervous that I was going to **** a trans going into OD but it took it like a champ
Jakes builds great transmissions and they have been proven. Thats a big plus
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04-23-2014, 12:25 PM
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04-23-2014, 12:31 PM
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I overbuilt the trans a bit as at the time he was giving away free trans brakes with lvl 5 transmission which I wanted anyway so it seemed like a no brainer for the money. Also, I run a single disk PY3400 that was unlocked the whole time. I'd imagine having the converter lock on a pass would be much harder on the trans shifting into OD, but Jake would be better suited to speak to that.
04-23-2014, 01:31 PM
#12
If you have the ability to drop timing on the shifts its much easier on the trans. With my toyota transmissions we would pull a ton of timing on the shifts to drop power and added it back slowly after the shift was complete. Slows you down a bit but its MUCH easier on the trans. Shifting at full power is the hardest on parts.
Alot depends on the vehicle weight too. I was in overdrive a little after half track with my V6 buick powered rx-7. (factory 4.10 gear) Around 600whp going by weight and trap speed. Nothing but additional pressure, clutch pack, and shift kit in a 200R4.
Alot depends on the vehicle weight too. I was in overdrive a little after half track with my V6 buick powered rx-7. (factory 4.10 gear) Around 600whp going by weight and trap speed. Nothing but additional pressure, clutch pack, and shift kit in a 200R4.
04-23-2014, 02:51 PM
#14
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Please post back what you find out. I was thinking about picking up a Jakes 4L80 for my car and I wouldn't mind knowing what the holding capacity of those would be in 4th. I've always been told that they cannot handle more than 500 HP in overdrive. I haven't heard much on what the built ones can hold.
04-23-2014, 03:16 PM
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Fwiw, the only issue I've had with the trans is the pump seal came out but got that fixed right before the half mile. I drove over an hour and a half there. Ran it a few times and drove it back home. No problems.
04-23-2014, 09:01 PM
#17
I would think keeping it in 3rd and shifting into 4th at the moment you need to go into overdrive would be best. This keeps the overrun clutches on through most of the run. The weak link in 4th isn't the clutches themselves, which are engaged when actually in 4th gear. It's the overdrive roller clutch which cannot take serious abuse, which is being used while the selector is in 4th and the trans is in 1-3 gear. Once it shifts into 4th, the clutches take over and the roller is not being stressed.
I'm curious what Jake says - please report back with his advice.
I'm curious what Jake says - please report back with his advice.
04-24-2014, 02:38 AM
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I just did what you are asking. I have a 4l80e build similar to Jake's level 2 and ran a 1/2 mile event last weekend.
Truck is AWD and about 4000lbs when we raced. Kept the shifter in OD the whole time and shifting at 5600rpm. 26" tall tire and 3.42 gears.
Ran 155, 155, 159, 160, 165, 163, 164, and 164. Rolling start and crossed the line at just under 6100rpms on the faster runs. Max boost was 15psi. Never skipped a beat!
Truck is AWD and about 4000lbs when we raced. Kept the shifter in OD the whole time and shifting at 5600rpm. 26" tall tire and 3.42 gears.
Ran 155, 155, 159, 160, 165, 163, 164, and 164. Rolling start and crossed the line at just under 6100rpms on the faster runs. Max boost was 15psi. Never skipped a beat!