CSF to Do88 transition...

nicksm3 · 07-23-2020, 12:54 PM

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?

SYT_Shadow · 07-23-2020, 01:47 PM

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.

tsk94 · 07-23-2020, 02:29 PM

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.

Ximian · 07-23-2020, 03:30 PM

Quote:

Originally Posted by SYT_Shadow

slonik dct pan overfilled.

How much fluid did you add? I got 6 liters, but thinking maybe I should get one or two more.

SYT_Shadow · 07-23-2020, 04:31 PM

Quote:

Originally Posted by Ximian

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

MaX PL · 07-23-2020, 04:47 PM

Quote:

Originally Posted by SYT_Shadow

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?

nicksm3 · 07-23-2020, 05:03 PM

Quote:

Originally Posted by MaX PL

Quote:

Originally Posted by SYT_Shadow

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.

SYT_Shadow · 07-23-2020, 05:04 PM

Quote:

Originally Posted by MaX PL

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

SYT_Shadow · 07-23-2020, 05:35 PM

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

nicksm3 · 07-23-2020, 05:46 PM

Quote:

Originally Posted by SYT_Shadow

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

SYT_Shadow · 07-23-2020, 05:47 PM

Quote:

Originally Posted by nicksm3

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

rcracin · 07-23-2020, 06:03 PM

Just go do88. Proven cooler. Why not keep all temps down if possible? Do it!!!!!

nicksm3 · 07-23-2020, 06:42 PM

Quote:

Originally Posted by rcracin

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.

rcracin · 07-23-2020, 07:20 PM

Quote:

Originally Posted by nicksm3

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.

nicksm3 · 07-23-2020, 09:00 PM

Quote:

Originally Posted by rcracin

Quote:

Originally Posted by nicksm3

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

dogbone · 07-23-2020, 10:56 PM

Here’s my write up. It’s a few posts down on this page: https://www.m3post.com/forums/showth...158445&page=18

Ximian · 08-03-2020, 12:18 AM

Quote:

Originally Posted by SYT_Shadow

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?

SYT_Shadow · 08-03-2020, 07:55 AM

Quote:

Originally Posted by Ximian

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

07-23-2020, 12:54 PM	#1
nicksm3 Colonel 969 Rep 2,433 Posts Drives: e92 m3 Competition Join Date: Jun 2014 Location: Westchester NY iTrader: (6)	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
SYT_Shadow ///M Powered for Life 11477 Rep 10,328 Posts Drives: E90M/E92M/M4GTS/M4GT4/X5M Join Date: Sep 2010 Location: Greenwich, CT iTrader: (2)	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. __________________ DIY: S65 Rod Bearings E9X PFC Z54 BBK on F8X BK harness bar + seats: fit 6 tires in an M3 do88 Cooling Goodies GTS Twins: GTMore project Last edited by SYT_Shadow; 07-23-2020 at 05:04 PM..
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07-23-2020, 02:29 PM	#3
tsk94 Lieutenant Colonel 1522 Rep 1,591 Posts Drives: E92 M3, E82 128i, F82 M4, E36 Join Date: May 2017 Location: Calgary iTrader: (2)	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, 05:35 PM	#9
SYT_Shadow ///M Powered for Life 11477 Rep 10,328 Posts Drives: E90M/E92M/M4GTS/M4GT4/X5M Join Date: Sep 2010 Location: Greenwich, CT iTrader: (2)	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 __________________ DIY: S65 Rod Bearings E9X PFC Z54 BBK on F8X BK harness bar + seats: fit 6 tires in an M3 do88 Cooling Goodies GTS Twins: GTMore project Last edited by SYT_Shadow; 07-23-2020 at 05:46 PM..
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07-23-2020, 06:03 PM	#12
rcracin Major 1243 Rep 1,287 Posts Drives: M3 Join Date: Jul 2012 Location: NYC iTrader: (3)	Just go do88. Proven cooler. Why not keep all temps down if possible? Do it!!!!!
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07-23-2020, 10:56 PM	#16
dogbone Colonel 5349 Rep 2,805 Posts Drives: '09 E90 M3 - IB Join Date: Feb 2012 Location: 93 million miles from the Sun iTrader: (1) Garage List 2009 BMW E92 M3 [0.00] 2009 BMW E90 M3 [0.00]	Here’s my write up. It’s a few posts down on this page: https://www.m3post.com/forums/showth...158445&page=18
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