10R80 hesitation at 230F

[EFI]

I've read alot of your posts about failures and stuff, but I don't think I've seen you mention the converter lock up clutch as the failure point. If I recall correctly, it was the trans that gave you the issue(s). Is this new developing story that the converter lockup clutch is failing? Or could it be that the weak lockup clutch is causing the trans to fail?

Lockup clutch is unfortunately the point of failure of this trans. Unfortunately the lockup clutch is built into the surface of the torque converter instead of being separated.
That would be the main upgrade i would do to the trans.
And 150f. Max? Man...i keep itnthat way!!!!!!! The cooler the better.

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[IrishStallion]

Flyhalf, not to change the subject from A10, but have you done the head cooling mod on your engine??

 

[Flyhalf]

No it will climb up to 194-203 max. It just performs better between 150-200f.

I've read alot of your posts about failures and stuff, but I don't think I've seen you mention the converter lock up clutch as the failure point. If I recall correctly, it was the trans that gave you the issue(s). Is this new developing story that the converter lockup clutch is failing? Or could it be that the weak lockup clutch is causing the trans to fail?

So this is my third rebuilt/trans
The second one was a torque converter failure. The clutches were actually pretty good. Thanks to the bigger trans cooler.
The first one was a mix of issues including clutches.
This third one is suffering cause i thickered the oil maybe too much (mixing with too much UV from 6r80)
My idea was to hold better at bigger temps. Problem is. Thicker oil = more heat (more friction) and less pass on the filter.
Next upgrade is. Go back to ULV fluid and make a smal hole in the filter.
Also exploring the option to remove the spring controlling thr opening of the cooler lines. To have constant usage of the cooler (right now it opens at 190f)

 

[Flyhalf]

Flyhalf, not to change the subject from A10, but have you done the head cooling mod on your engine??

Not sure what you mean.
I have bigger radiator and also a water dpray system spraying the coolers and the radiator

 

[IrishStallion]

Not sure what you mean.
I have bigger radiator and also a water dpray system spraying the coolers and the radiator

It is where you pop out your freeze plugs out of back of engine to run a T or bypass to get the coolant running back to heat exchanger. Helps keep # 7, 8 cylinders cooler.

http://www.modularmotorsportsracing.com

 

[Flyhalf]

It is where you pop out your freeze plugs out of back of engine to run a T or bypass to get the coolant running back to heat exchanger. Helps keep # 7, 8 cylinders cooler.

http://www.modularmotorsportsracing.com

I dont. So far engine runs strong. Also compression test showed 245psi all 8 cyclinders

 

[IrishStallion]

I dont. So far engine runs strong. Also compression test showed 245psi all 8 cyclinders

Well Dude, after watching video you definitely run your car MUCH harder than mine. It is hard sometimes sorting out the “fear porn” must do’s on internet forums. Everyone says oil pump gears/crank sprocket a must for any FI. Midnight performance just ripped off a 7.9 @ 170 mph on stock sealed gen3 with twin turbo’s. Car has multiple passes on stock gears/sprocket. Lol...

 

[ST4NG50]

I was at Atlanta Motorsports Park last weekend doing an HPDE with Jzilla. I can confirm that switching gears at lower RPM (~6500), or simply just shift gears less frequently, if possible, goes a long way to keep our 10R80s cool. In fact, it keeps my transmission temperature right in the middle of the gauge with little to none hesitation or any overheating issues. The fact that AMP is a slower track than Road Atlanta (and hence fewer shifts are needed) might be big factor, too.

However, for W2W races I think this method would not be very feasible, since we would want to max out the output from our engine? For HPDEs I think this would work just fine if you are willing to sacrifice just a bit of power in exchange for a healthy transmission.

Yes.
1.36 at laguna is with me shifiting very early at 6500
I reached the conclusion that depends also by the pace you have.
At 1.40 wich is still a great time i can go around forever.
New update soon on the trans.
I thinkni know exactly what's wrong this time. Keep u posted.

 

[EFI]

The problem with short shifting 1000rpm sooner is that it most likely leads to more shifting than if you were to just wind it out to redline. Upshifting at 6500 then downshifting for the corner vs. just staying in the same gear to 7500.

The question is, what heats it up more. Revving to redline but staying in the same gear, or revving to 6500 but having an extra upshift and downshift.

witching gears at lower RPM (~6500), or simply just shift gears less frequently

 

[IrishStallion]

The problem with short shifting 1000rpm sooner is that it most likely leads to more shifting than if you were to just wind it out to redline. Upshifting at 6500 then downshifting for the corner vs. just staying in the same gear to 7500.

The question is, what heats it up more. Revving to redline but staying in the same gear, or revving to 6500 but having an extra upshift and downshift.

I’m guessing the higher rpm shift just creates more heat.

 

[zirfj312]

So this is my third rebuilt/trans
The second one was a torque converter failure. The clutches were actually pretty good. Thanks to the bigger trans cooler.
The first one was a mix of issues including clutches.
This third one is suffering cause i thickered the oil maybe too much (mixing with too much UV from 6r80)
My idea was to hold better at bigger temps. Problem is. Thicker oil = more heat (more friction) and less pass on the filter.
Next upgrade is. Go back to ULV fluid and make a smal hole in the filter.
Also exploring the option to remove the spring controlling thr opening of the cooler lines. To have constant usage of the cooler (right now it opens at 190f)

What Setrab cooler are you using for the transmissio?

 

[Flyhalf]

925.
In front of everything.
Also some water spray in front.

 

[zirfj312]

And you’ve got the oil cooler mounted below yes?

 

[Flyhalf]

And you’ve got the oil cooler mounted below yes?

Yes.

 

[AdrianM1972]

Man, I'm so glad I got the 6MT. I added an oil cooler, a Full Tilt Boogie Rear end cooler a 170 deg thermostat with a tune to kick the fans on at 170 and my car stayed cool at all the 2019 Autocross and Track events I went to in FL.

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