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      07-23-2020, 12:54 PM   #1
nicksm3
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CSF to Do88 transition...

So I have all the CSF goods for years now but...
Once temps outside are hot...transmission gets laggy after a few laps. My buddy David Eaton of EATON MOTORSPORTS swears on his E92 never had a laggy down shift or up shift with his Do88 rads.
Was at the Glen few days ago, after 5th lap... laggggggy tranny while in manual mode. I'm over this.
Any one can chime in?
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      07-23-2020, 01:47 PM   #2
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I think radiators in general don't make a huge difference, but the do88 DCT radiator is very different than OEM and proven to make a difference

Lots of people have 'never had problems' but their use cases are different than yours. That's what makes apples to apples comparisons so hard.

What I can say is we've posted the 2:04 WGI video with a full weight E90 M3 with no aero and BFG R1 tires. It's a full 25 min session. The DCT worked perfectly without any lag or any other issues.
do88 full radiator kit, slonik dct pan overfilled.

Would the DCT start having issues at 2:02 or something? Perhaps. But so far, none.

Last edited by SYT_Shadow; 07-23-2020 at 05:04 PM..
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      07-23-2020, 02:29 PM   #3
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I would just upgrade the DCT cooler. Do you have a larger DCT pan? The other radiators between CSF and do88 are quite similar and wouldn't help with DCT overheating so it would be a waste to swap all of them out, unless you're having other overheating issues?

I've been very happy with my full CSF kit thus far. But, my car is manual and I run in a milder climate - but so far 0 issues with overheating.
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      07-23-2020, 03:30 PM   #4
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Quote:
Originally Posted by SYT_Shadow View Post
slonik dct pan overfilled.
How much fluid did you add? I got 6 liters, but thinking maybe I should get one or two more.
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      07-23-2020, 04:31 PM   #5
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Quote:
Originally Posted by Ximian View Post
How much fluid did you add? I got 6 liters, but thinking maybe I should get one or two more.
I added until it wouldn't take any more. Not sure how much I got in as I didn't do a full flush
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      07-23-2020, 04:47 PM   #6
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Quote:
Originally Posted by SYT_Shadow View Post
I think radiators in general don't make a huge difference, but the do88 DCT radiator is very different than OEM and proven to make a difference

Lots of people have 'never had problems' but their use cases are different.

What I can say is we've posted the 2:04 WGI video with a full weight E90 M3 with no aero and BFG R1 tires. It's a full 25 min session. The DCT worked perfectly without any lag or any other issues.
do88 full radiator kit, slonik dct pan overfilled.

Would the DCT start having issues at 2:02 or something? Perhaps. But so far, none.
post the video?
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      07-23-2020, 05:03 PM   #7
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Quote:
Originally Posted by MaX PL View Post
Quote:
Originally Posted by SYT_Shadow View Post
I think radiators in general don't make a huge difference, but the do88 DCT radiator is very different than OEM and proven to make a difference

Lots of people have 'never had problems' but their use cases are different.

What I can say is we've posted the 2:04 WGI video with a full weight E90 M3 with no aero and BFG R1 tires. It's a full 25 min session. The DCT worked perfectly without any lag or any other issues.
do88 full radiator kit, slonik dct pan overfilled.

Would the DCT start having issues at 2:02 or something? Perhaps. But so far, none.
post the video?
I would love to see that video.

But to answer some of the questions on here yes I have the SLON DCT PAN. I'm going to do a flush and really top off the fluid we shall see how she works on the next event.
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      07-23-2020, 05:04 PM   #8
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Quote:
Originally Posted by MaX PL View Post
post the video?
I don't want to mess up nick's thread, so here's the thread with the vid:
https://www.m3post.com/forums/showpo...11&postcount=3
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      07-23-2020, 05:35 PM   #9
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So far, with the DCT with the do88 cooler and the slonik pan completely full we have never had a double-shift or shift lag in the E90. We used to double-track it, so after going out in PCA red group (fastest) it would go out again in the black group (second fastest).

The CS in comparison which is completely stock engine/tranny wise will not overheat, but the DCT will definitely lag. Not only due to temp, but also when cornering/braking

Last edited by SYT_Shadow; 07-23-2020 at 05:46 PM..
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      07-23-2020, 05:46 PM   #10
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Quote:
Originally Posted by SYT_Shadow View Post
So far, with the DCT with the do88 cooler and the slonik pan completely full we have never had a double-shift or shift lag in the E90.

The CS in comparison which is completely stock engine/tranny wise will not overheat, but the DCT will definitely lag. Not only due to temp, but also when cornering/braking
Won't mess up my thread man, I welcome all and vids
But yes...hard braking...won't give me shifts unless car is settled...the frustration
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      07-23-2020, 05:47 PM   #11
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Quote:
Originally Posted by nicksm3 View Post
Won't mess up my thread man, I welcome all and vids
But yes...hard braking...won't give me shifts unless car is settled...the frustration
the vid's in post #8
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      07-23-2020, 06:03 PM   #12
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Just go do88. Proven cooler. Why not keep all temps down if possible? Do it!!!!!
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      07-23-2020, 06:42 PM   #13
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Quote:
Originally Posted by rcracin View Post
Just go do88. Proven cooler. Why not keep all temps down if possible? Do it!!!!!
Might be right but would love data, but impossible.

Regarding that stroked E90. Sounds very good...if that driver was flat up the Esse's, broke later on the back straight he'd be 2:02's. If he ran Aero. Would be Sub 2's hands down.
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      07-23-2020, 07:20 PM   #14
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Quote:
Originally Posted by nicksm3 View Post
Might be right but would love data, but impossible.

Regarding that stroked E90. Sounds very good...if that driver was flat up the Esse's, broke later on the back straight he'd be 2:02's. If he ran Aero. Would be Sub 2's hands down.
Sytshadow & dogbone have data. All you need to know is they dont have overheating problems. Thatís enough to know that the do88 cooler & slonik pan combo is the best you cam have for dct.
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      07-23-2020, 09:00 PM   #15
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Quote:
Originally Posted by rcracin View Post
Quote:
Originally Posted by nicksm3 View Post
Might be right but would love data, but impossible.

Regarding that stroked E90. Sounds very good...if that driver was flat up the Esse's, broke later on the back straight he'd be 2:02's. If he ran Aero. Would be Sub 2's hands down.
Sytshadow & dogbone have data. All you need to know is they dont have overheating problems. That’s enough to know that the do88 cooler & slonik pan combo is the best you cam have for dct.
Perfect! And good enough for me
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      07-23-2020, 10:56 PM   #16
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Hereís my write up. Itís a few posts down on this page: https://www.m3post.com/forums/showth...158445&page=18
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      08-03-2020, 12:18 AM   #17
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Quote:
Originally Posted by SYT_Shadow View Post
I added until it wouldn't take any more. Not sure how much I got in as I didn't do a full flush
I got 6 liters out, but with the Slon pan I'm assuming it'll take 7 liters. Thanks to buying only one cheap fluid pump, I got one liter in before it broke.

Did you perform the "fluid level check" of running the engine at 2k RPM for a minute or just add all the fluid you could and closed it back up?
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      08-03-2020, 07:55 AM   #18
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Quote:
Originally Posted by Ximian View Post
I got 6 liters out, but with the Slon pan I'm assuming it'll take 7 liters. Thanks to buying only one cheap fluid pump, I got one liter in before it broke.

Did you perform the "fluid level check" of running the engine at 2k RPM for a minute or just add all the fluid you could and closed it back up?
The fluid check/2k rpm procedure was needed for it to take more than like 4
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