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post #1 of 5 (permalink) Old 12-29-2016, 07:54 PM Thread Starter
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High Revs

How high of rpms can a 'built' 4R70W take? I forget most of the details but it was a purpose built race transmission complete with rear lube mod. The car has the huge tranny cooler and a 4400 stall Circle D lockup up converter.

After the recent motor overhaul, the datalogs from the last track outings before the winter set in suggested I will need to up the shift points and change from 4.30s in the differential to 4.88s to make the most out of it. Currently I have both shift points set at 7,000 in the software. Datalogs show the actual 1-2 shift point around 7,500 and the actual 2-3 shift point at 7,100-7,200 The 1-2 seems to be close to optimum but the 2-3 is definitely too early as it drops the revs too low (5,100-5,200) when it shifts to 3rd.

The datalogs and dyno math tells me I need to be pushing 8,000 rpms on the 1-2 shift and around 7,750 on the 2-3 shift. I figure when spring comes I'll take it to a test and tune and sneak the shift points up around 250 each increment until it seems to run out of breath or the slips say it is slower or...
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post #2 of 5 (permalink) Old 12-29-2016, 08:52 PM
No, Mr. Lemmywinks, No!!!

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I have heard that at extreme RPMs the rotation can remove the working fluid from the clutches, but I find that hard to believe; it's pretty constrained.

Oscar plans to operate upwards of 7 grand; idk what his mods are.

I'm sure they're expensive, and have a coating...

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.


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post #3 of 5 (permalink) Old 12-29-2016, 09:51 PM
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Quote:
Originally Posted by Grog6 View Post
I have heard that at extreme RPMs the rotation can remove the working fluid from the clutches, but I find that hard to believe; it's pretty constrained.

Oscar plans to operate upwards of 7 grand; idk what his mods are.

I'm sure they're expensive, and have a coating...
Yeah, a coating of dust!
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post #4 of 5 (permalink) Old 12-29-2016, 10:31 PM
No, Mr. Lemmywinks, No!!!

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Quote:
Originally Posted by MadMikeyL View Post
Yeah, a coating of dust!

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.


"War Is Peace. Freedom Is Slavery. Ignorance Is Strength." - George Orwell.
Truth Isn't Truth. - Rudy Giuliani, 2018 Award winner, “Most Outrageous Diversion” by MSNBC for this quote
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post #5 of 5 (permalink) Old 12-30-2016, 06:51 AM
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JP. My redline is at 7K I've never had a problem with the transmission handling that; I'm not sure where Rob's set my shift points but they're probably comperable to what you've outlined above. I would suggest calling Rob to discuss your plans.

Quote:
Originally Posted by MadMikeyL View Post
Yeah, a coating of dust!


I was thinking the same thing. I'm glad you said it first.

Mods? Yea, I got mods ...
Air silencer delete, warp drive, dilithium crystals, flux capacitor, Slingshot Rubber band power adder, Moonshine & Gas, Leaf Blower Supercharger, Hamster Wheel & Hamster, Energizer Bunny generating 1.21 gigawatts, Mr. Fusion® Home Energy Reactor, hover conversion and a sextant celestial navigation system (The original GPS)
Best 1/4: 1,320 nanoseconds @ 670,616,629.2 miles per hour

"There isn't that much difference anymore between spacecraft, aircraft and modern automobiles..." - Keith Henry, NASA's Langley Research Center
See a list of my real mods and pictures of my car HERE. The true performance of my car was made possible by the Carolinas Crew Chief, RobertP at Rob's Tire & Auto

Last edited by Trunk Monkey; 12-30-2016 at 07:56 AM.
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