just installed DO88 radiator

I just installed DO88 rad and oil cooler. Fitment was good (actually.... surprisingly good). No leaks or funny welds to my eyes. Short term experience only.

BadgerPride wrote

Not an expert but just a thought, could the oil diverter be clogged or damaged causing no oil to flow through the oil cooler. I was chatting with someone and he mentioned the oil diverter thermostat was shut close pretty much when he was doing the diverter valve upgrade. That could explain the quick high temp.

I thought that too so I eliminated it and replaced it with a Motorsport style full flow thermostat. No luck. Car still got hot.

Lienrocs wrote

I put the full cooler stack into that car and it also overheats.

Interesting, im wondering if one of the coolers could be clogged or flow restricted internally.

Since it seems to be coolant temps that is the issue, take the rad out, run a hose thru it and see if it's flowing out the other end. or swap the stock rad back in and re-test, to eliminate a bad rad.

tdott wrote

Interesting, im wondering if one of the coolers could be clogged or flow restricted internally.

Since it seems to be coolant temps that is the issue, take the rad out, run a hose thru it and see if it's flowing out the other end. or swap the stock rad back in and re-test, to eliminate a bad rad.

I flushed the new rad before I put it into the black e92 and when I swapped it into the orange e92. I also did two rounds of distilled water before the final fill.

Had the do88 DCT cooler installed, along with dry break overfill kit, back in April and so far so good. Shop didn’t mention any strange welds or issues and no leaks so far after a couple of track days. DCT seems to shift great in hot temps.
Still running stock oil and water cooling stuff, but this thread gives me pause for future cooling updates.

PAM3Guy wrote

Had the do88 DCT cooler installed, along with dry break overfill kit, back in April and so far so good. Shop didn’t mention any strange welds or issues and no leaks so far after a couple of track days. DCT seems to shift great in hot temps.
Still running stock oil and water cooling stuff, but this thread gives me pause for future cooling updates.

I’ve got the same trans cooler, deep pan and dry break. No issues with the gearbox at all.

I’m getting the CSF cooler into the car tomorrow or the day after. I’ll report back with some street temps for a very unscientific back to back.

I got the CSF rad on the car. I did a full coolant flush, used some VP rad cleaner, two cycles of distilled water and the final fill with water/water wetter. Same thing I was running in the do88 cooler. Very unscientific results are in. Did the same loop around Denver, ambient temps within 5 degrees, same time of day same humidity. The csf cooler peaked at 204, do88 at over 220. Just driving down the freeway. I’m off to Laguna at the end of September and will update if it holds up on track.

Lienrocs wrote

I got the CSF rad on the car. I did a full coolant flush, used some VP rad cleaner, two cycles of distilled water and the final fill with water/water wetter. Same thing I was running in the do88 cooler. Very unscientific results are in. Did the same loop around Denver, ambient temps within 5 degrees, same time of day same humidity. The csf cooler peaked at 204, do88 at over 220. Just driving down the freeway. I’m off to Laguna at the end of September and will update if it holds up on track.

Appreciate the update. Will be curious to see how it goes on track but definitely noting this for next season. A lot of what I had read on this forum about CSF was that it did little over stock, so this is interesting.

PAM3Guy wrote

Appreciate the update. Will be curious to see how it goes on track but definitely noting this for next season. A lot of what I had read on this forum about CSF was that it did little over stock, so this is interesting.

That’s not true, the CSF oil cooler was specifically not much of an improvement over stock. The do88 oil cooler out performs the CSF oil cooler.

spammysammich wrote

That’s not true, the CSF oil cooler was specifically not much of an improvement over stock. The do88 oil cooler out performs the CSF oil cooler.

Yes, I had seen a number of threads praising the do88 oil cooler over the CSF, but it's hard to tell from prior threads whether the CSF oil cooler or rad were any improvement at all.
For example https://www.m3post.com/forums/showthread.php?t=1730821

Is there a better thread that shows a consensus on the rad?

Not that I know of. My reason for going with the CSF was based on availability and not being impressed with the fit of the do88 rad I helped a friend install. I had easy access to CSF and a great price from a friend. Also,I HATE plastic end tanks on radiators and intercoolers.

spammysammich wrote

Not that I know of. My reason for going with the CSF was based on availability and not being impressed with the fit of the do88 rad I helped a friend install. I had easy access to CSF and a great price from a friend. Also,I HATE plastic end tanks on radiators and intercoolers.

Yes the metal construction definitely seems to be an advantage from a durability perspective, so that's certainly a valid reason to go with it.

PAM3Guy wrote

Yes, I had seen a number of threads praising the do88 oil cooler over the CSF, but it's hard to tell from prior threads whether the CSF oil cooler or rad were any improvement at all.
For example https://www.m3post.com/forums/showthread.php?t=1730821

Is there a better thread that shows a consensus on the rad?

I had a Do88 radiator, one of the originals purchased and installed in 2020 as well. It was fantastic. The car ran at 205 degrees at COTA no matter the temperature/humidity. It was flawless. I put that car through a tire barrier and destroyed all the do88 coolers. I bought new ones when rebuilding the car and the new ones, the rad in particular, for whatever reason did not work well.

Edit: I also ran the stock cooler stack (all of them) to see if new coolers were necessary at all, and the water temps with the factory rad were identical to the do88 rad.