Good RPM / MPH for WOT TCC lockup?

[BuickMike]

So I'm trying to dial in my car for the track and had a question:

Right now I have my TC set to lockup at 95mph (vigilante 5 disc). At 100mph it kicks in and RPN drops from 5200 to 4750 and the GN starts to pull freaking hard. I'm wondering if this is a good mph / RPM or if I should have it kick in a little earlier? Thoughts? BTW, my times below are with no traction and not WOT TCC lockup. I had to shift into 4th on that run. I'm guessing this time around I should be good for 120mph with good traction and the lockup.

 

[we4Mateo]

You're just about there with that mph. I think a te44 is done around 122mph in a full weight car. I personally would lock the tcc sooner. I lock mine as soon as I hit third which is around 85mph or so, maybe even sooner. You'll just have to experiment. I only use a 27" tire and can still trap 120 in third with rpms in the low 5k range. Sorry for the not so accurate figures, I don't log yet.

 

[bison]

I can't see your sig on the iOS app but if it's a stock cam try and lock the converter so that the rpm drops to about 4600. Run a taller tire and lock a little later for better times. The stock cam/heads aren't helping anything at 5000+rpm. It would be just fine if there was almost zero rpm drop unlocked on the 1-2 and 2-3 shifts. I'd want it shifting around 4800 or so.

 

[bison]

Just saw your sig. Your engine should be ok to 5000. You are out of turbo though. A turbo and 4-5psi more boost is about 100hp.

 

[BuickMike]

Thanks for the responses. I'll drop it down 10mph and see how it does. I initially built this motor with the intention of putting on a TE-62 or something equivelant, but I'm having too much fun with my current setup. The TE-44 with the Precision housing really woke up with the converter / heads / cam. Boost is instant and hits hard like I just hit nitrous. I'm not planning on caging the car since my main intention was to build a road car and I'm already fast enough to need one, so I have no intentions of going faster. Plus I'm not willing to push a car with stock main caps and rods any harder.

 

[we4Mateo]

Thanks for the responses. I'll drop it down 10mph and see how it does. I initially built this motor with the intention of putting on a TE-62 or something equivelant, but I'm having too much fun with my current setup. The TE-44 with the Precision housing really woke up with the converter / heads / cam. Boost is instant and hits hard like I just hit nitrous. I'm not planning on caging the car since my main intention was to build a road car and I'm already fast enough to need one, so I have no intentions of going faster. Plus I'm not willing to push a car with stock main caps and rods any harder.

Good plan. Sounds like a real beast already. Good luck.

 

[BuickMike]

Good plan. Sounds like a real beast already. Good luck.

We have similar builds. Do you have any head work done?

 

[TurboDave]

My stock block and TE44 loved it when I locked the vig. at 88mph.

 

[BuickMike]

My stock block and TE44 loved it when I locked the vig. at 88mph.

"When this car hits 88mph, you're gonna see some serious s#!t"

So I set my TT to command lockup at 81mph. Since there seems to be a little delay (setting it at 93 didn't bring the RPM's down until 98mph, I figure now I should see them drop around 85-86. I'll let you guys know how it works out.

 

[we4Mateo]

We have similar builds. Do you have any head work done?

Just port matching to the intake when it was apart. Stock valves, rockers, bowls, seats, runners, etc. You're just a turbo away from some seriousness though.

 

[we4Mateo]

My stock block and TE44 loved it when I locked the vig. at 88mph.

Very much so

 

[BuickMike]

A turbo and some better tires. Tonight was the last night of Firebord Raceway being open for test and tune and I blew it. I did a huge burnout and ended up roasting the tires out of the hole. I think I heated up my DR's way too much. It was super busy and I only got 1 run. Oh well. I won't know what this thing is capable of. Last year I hit 118 on street tires and had to let up and shift into 4th because I had no lockup and ran out of gear. Considering that I'm sure my setup is good for 122 at least.

 

[fastblackracing]

DROPPING THE RPM to much when the coverter locks can pull the car out of power enrichment mode go lean and detonate ask me how i know you will need to talk this over with you chip guy to make sure what the lowest rpm you can go is cars fly when the converter locks good and boos and fuel are right, haulin azz is the proper term I believe my problem was when i dropped rpm below 4200 it leaned out . just passing along what I learned > let me know what you come up with >>> Mannie

 

[BuickMike]

Thanks for the info. I have noticed that in the lower RPM's the timing is high and AFR is not full PE. My converter is now locking around 4500 and I'm still in full PE so I'm all set.

 

[we4Mateo]

I drop mine down to under 4k rpm, I think, without issue. I thought PE was had by throttle position and maf reading? I lock my TC as soon as it hits 3rd which drops rpm down to about 4400 and then the TC pulls it down below 4k. The peak hp is at 4400 and peak torque @ 3300 so I try to keep it between there or as close as possible for as long as possible. My regular auto shifts occur at 4800rpm.