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is a diff cooler legal for spec iron?


olaaf

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Was about to install one when I double checked the rules. The pertinent sections are:

 

7.13.6- oil and power steering coolers of any design are permitted

 

Differential oil is oil.

 

7.9.6- The Ford Racing M-4033-K/KA rear differential cover is permitted

 

I would think that since a cover that is specifically made for a diff cooler is permitted, the KA model (the only difference between the K and KA are the tapped ports, I think), diff cooler legality is implied?

 

thanks

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I am fairly certain that is a no. But I am just a competitor not a rules guy.

However, I think you guys should be able to carry all the extra weight that you can.

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just wondering how hot does the diff oil get after 30min of hard racing, and a good LSD installed (2005-2010 mustang without crazy power)? is it over 250 F?

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If I remember correctly, my diff oil would run about 275-300. And I ran the diff for 4 years without any problems in a 2010 Mustang. So you shouldn't need a diff cooler.

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Short sprint race format like what we have, I'm going to say it's not needed. Now Long enduro races I would say yes get one.... Course having one regardless is not going to hurt , and It's going to help extend the life of the parts inside the dif that is for sure.

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Steve

 

Thanks for the feedback. I’ve melted the axle seals on the 8.8 during an endurance race on a car with an open diff and about the same power, so I like to have the diff cooler.

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Short sprint race format like what we have, I'm going to say it's not needed. Now Long enduro races I would say yes get one.... Course having one regardless is not going to hurt , and It's going to help extend the life of the parts inside the dif that is for sure.

 

 

anything over 20-30 minutes you're going to get too hot. We run them on all of our cars.

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anything over 20-30 minutes you're going to get too hot. We run them on all of our cars.

 

OK, nice to hear from the experts- thanks.

 

One more question on this topic, does anyone do any ducting to get the hot air from the fan out of the trunk?

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anything over 20-30 minutes you're going to get too hot. We run them on all of our cars.

 

OK, nice to hear from the experts- thanks.

 

One more question on this topic, does anyone do any ducting to get the hot air from the fan out of the trunk?

 

none

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Just for the record, I was logging diff temp in my new s197 AI car this past weekend. We were at Summit Point and the ambient temperature was probably in the 80s. The Sunday race was 40 minutes long and we logged 29 laps. I was surprised to see that my diff temp reached 336 degrees on lap 29. I will be thinking about a diff cooler for this car.

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Just for the record, I was logging diff temp in my new s197 AI car this past weekend. We were at Summit Point and the ambient temperature was probably in the 80s. The Sunday race was 40 minutes long and we logged 29 laps. I was surprised to see that my diff temp reached 336 degrees on lap 29. I will be thinking about a diff cooler for this car.

 

That's effing hot!

The Autometer DIFF gauge stops at 250 so I'm thinking that's TOO hot.

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Just to add to the data collection here; the FR500S Mustang Challenge cars did NOT come with a diff cooler and IIRC, their races were in the 50-60 minute ranges. I've never heard from any of the MC racers/owners of ever having any issues with the diff nor have I had any with mine. Actually, I've never run a diff cooler in any of my race cars and have never had any issues. It's about the only component that hasn't given me any problems!!!

 

Ed

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Just to add to the data collection here; the FR500S Mustang Challenge cars did NOT come with a diff cooler and IIRC, their races were in the 50-60 minute ranges. I've never heard from any of the MC racers/owners of ever having any issues with the diff nor have I had any with mine. Actually, I've never run a diff cooler in any of my race cars and have never had any issues. It's about the only component that hasn't given me any problems!!!

 

Ed

 

 

As Ed's Diff explodes at the next race

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That's effing hot!

The Autometer DIFF gauge stops at 250 so I'm thinking that's TOO hot.

 

 

My fox body has a gauge on the floater diff cover. I have seen it at 280+. In my opinion, that IS too hot!

 

Summit Point seems to heat the diff up more than VIR. I am guessing that it is the carousel turn.

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Just to add to the data collection here; the FR500S Mustang Challenge cars did NOT come with a diff cooler and IIRC, their races were in the 50-60 minute ranges. I've never heard from any of the MC racers/owners of ever having any issues with the diff nor have I had any with mine. Actually, I've never run a diff cooler in any of my race cars and have never had any issues. It's about the only component that hasn't given me any problems!!!

 

Ed

 

 

As Ed's Diff explodes at the next race

Yeah, I probably just jinxed myself...

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