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Interesting! I remember the discussion about this system in one of the Z28 videos, but I guess I didn't really think through it.

So you are using the engine coolant to cool the trans fluid - typical
You are using the trans fluid to cool the differential - interesting

Are normal manual trans temps that much cooler than a differential or does this only work because the trans fluid is being "pre-cooled" before being sent back to the diff cooler?

I'll bet that adds a lot of capacity to the trans fluid system!

Quote:

Originally Posted by Stielow (Post 559448)

I got tired of wiring so I'm working on my diff and transmission cooling. I'm using a set up from a ZL-1 to cool my diff. I had D&D performance modify my Tremec T-56 Magnum to accept a stock TR6060 oil pump. I will use that mechanical pump to pump transmission fluid to the radiator to cool it in a oil to water oil cooler in the end tank. Then the cooled trans fluid gets pumped to the back of the car to go to a oil to oil diff cooler. I'm using the stock ZL-1cooler (part number 20931169). The trans fluid then goes back to the transmission.

We use this system on both the Z/28 and the ZL-1. It works great!

The CAD picture is the diff cooler in the Z/28. I used the ZL-1 cooler because it is 30% bigger.

So more OE tech in my hot rod.

Mark

Uhhh...Mark, I have the slightest idea of what you just said as I'm not a racer or track guy. But, I don't understand logic and reasoning...this is just bad a$$. Wow!! :headscratch: :faint: How do you do it...I mean how do you think of this stuff? :idea:

Wow --- it might be fun to try to outbid Charley for this one.....

What temps are you trying to achieve with this setup.... assuming it works just the same in this application as it does on the Z/28 & ZL/1 you mentioned.

Quote:

Originally Posted by wiedemab (Post 559450)

The system now holds 4.5 quarts of trans fluid I'll need to chech the diff volume but it should be a little more also.

I'll need to look up the kW heat rejection from the trans but it is a lot less than the diff. Off memory the diff needs 3 kW of cooling and the trans needs 1 kW and the oil cooler in the rad rejects 5 kW so the fluid is over cooled at the rad then sent to the diff. The trans fluid leaving the heat exchanger in the diff is still cool enough to cool the trans. We did it this way in production due to the cost of pumps and coolers. The pump in the Tremec trans is relatively cheap compared to a electric pump. We can run a ZL-1 and a Z/28 on track for tank fulls of fuel with no over temp issues. Before we added this cooling loop a ZL-1 would over temp the diff in 5 laps. I think the C-6 Vetts have a similar system.

Since I added diff coolers to my project my ring and pinion life has gone way up. . It also allows only one set of -6 lines to the front of the car. On Red Devil I had -6 AN for the trans and -8 AN for the diff due to the length of the lines and the viscosity of the fluid when it was cold. This system is also lighter that two big Weldon electric pumps. Red Devil still has the original ring and pinion in it from when I built the car and it is quite.

Another side benefit to this set up is it can also pre-warm your diff and trans in the pits. On cold mornings at the track if you let the car idle in natural the trans pump is working moving fluid to the red where it is heated then to the diff and the trans warming them. Nice for 35 degree mornings like at OUSCI.

At 740 HP to the tires diff and trans cooling become real issues.

My trans cooler in my rad is around 10 kw, bigger that the Z/28's, due to my higher output.

Cool oil is happy oil.

Thanks for the additional details!

Quote:

Originally Posted by GregWeld (Post 559455)

Greg

You really want to keep the trans and the diff below 325 F with a synthetic. I like to see under 300 F and over 210 F for track usage. If you get over 350 F you will start killing seals and hurting parts.

Mark

This is fantastic!! I am not building anything to this caliber, but am working towards a track car with my IROC. I have been trying to figure out a way to cool my manual trans and diff without all of the pumps and lines. This actually answers my dilemma. Now onto the next one...where to find the money to buy these parts.

Wow this one nice set up. Very well thought out , reduces weight , clutter , cost efficient and brings your trans and rear to working temp while at idle.
That is some real big boy engineering.

This is going to be the baddest PT car out there period.

Congrats mark

Quote:

Originally Posted by 214Chevelle (Post 559453)

...try imagining Garth doing the run down. It worked for me.

I remember reading about the diff cooler. I'd think the plates would be larger and spaced farther apart due to the diff fluid viscosity.

The art of engineering

I have followed your previous builds, read your book (loved it for the advice and explanations on why you do it the way you do your builds), and really like the rendering of Hellfire. You prove that good engineering is so beautiful that to me it is art. Yes, there is science in what you do but the result if a work of art. Can't wait to see video of it making runs on a track.