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Old 12-26-2018, 10:54 PM   #1
Nerddage
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Default 1994 940 whiteblock/m90 swap

Hello,

Which white block should I plop into my 940 with an m90? I live in Colorado and I am looking for a motor/ecu combo that wouldn't be murder to wire in(I know it is going to be a pain) and will be accepting to further upgrades down the road.

I have been lurking on the forums/PMing people and most the people who have done this swap are overseas and have access to certain cars that I have issues accessing/affording(and i wanted an NA setup which I have since abandoned). So my brain is overloaded with info. I am just trying to find the most feasible swap for my needs.

I wanted to work on this car for years and I am finally reaching a point in my life where I have the space and time to finally stop planning and start doing. Any help is appreciated!

Thanks!
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Old 12-27-2018, 12:19 AM   #2
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Do you already have the M90 If not why choose that transmission?
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Old 12-27-2018, 03:14 AM   #3
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Why a does it have to be a whiteblock? Are your goals impossible to reach with a
redblock?

On this site people give the redblock not nearly enough credit. Take a look on savarturbo to see what a low budget redblock can really do.

Also keep in mind there are 2 M90 versions. One redblock and one whiteblock version. Not interchangable.
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Old 12-27-2018, 03:46 AM   #4
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I have the whiteblock m90 with the associated parts. I have nothing against redblocks by any means. I just grew up driving a whiteblock (my brother got the redblock).
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Old 12-27-2018, 08:23 AM   #5
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Quote:
Originally Posted by Nerddage View Post
I have the whiteblock m90 with the associated parts. I have nothing against redblocks by any means. I just grew up driving a whiteblock (my brother got the redblock).
Ok then if you're going to put a turbo on it with some serious boost find either a 2.3L five cylinder or a B6284t from a 1999 or later S80 depending if you want the dual or single VVT. The 81 mm bores are stronger. You'll have to think about a set of stronger rods if you want to go to a high HP setup.
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Old 12-28-2018, 07:53 AM   #6
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The B5244T also comes highly recommended..... 81mm bore as mentioned above. Search for posts by Johann "The Man"......
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Old 12-28-2018, 12:06 PM   #7
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Quote:
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The B5244T also comes highly recommended..... 81mm bore as mentioned above. Search for posts by Johann "The Man"......
B5244T5 from -06 T5 models to be precise. 81mm bore and 93.2 stroke, low weight crank and coated pistons. And dual VVT.
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Old 12-28-2018, 07:24 PM   #8
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Awesome, Thank you all very much.

Would it be feasible to just take the ecu/associated parts from the donor b5244t? Or would a specific year be the best splice? Or should i just say screwit and do an aftermarket ecu.

Thanks again!
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Old 12-29-2018, 03:47 AM   #9
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Quote:
Originally Posted by Nerddage View Post
Awesome, Thank you all very much.

Would it be feasible to just take the ecu/associated parts from the donor b5244t? Or would a specific year be the best splice? Or should i just say screwit and do an aftermarket ecu.

Thanks again!
I'd go aftermarket all day if i could. But if you choose the stock ECU up to 1995 850's does not have a immobilizer.
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Old 12-29-2018, 09:28 AM   #10
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If you have the choice I don't know why would anyone go for the 5 cylinder 81 mm bore engine instead of the 6 pots variant. You can get the same hp output with less stress on the engine, you don't have to modify the oil pan and I don't think that the weight difference is relevant.
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Old 12-31-2018, 10:29 PM   #11
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Okay, now i know what to keep an eye out for on the classifieds/junkyards. Thanks again for the info. Hopefully ill have all the parts and be able to get started soon!
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Old 01-02-2019, 10:19 AM   #12
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Okay, now i know what to keep an eye out for on the classifieds/junkyards. Thanks again for the info. Hopefully ill have all the parts and be able to get started soon!
The twin turbo S80 isn't that rare so you can easily find a B6284t if you search a little.
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Old 01-03-2019, 05:53 PM   #13
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I am finding donor cars without too many miles. I just need to wait for the right time(I am in the middle of moving, so i will soon have available space for the project). Will it be possible to wire a b6284t/ecu to a 940 cluster without too much issue? That is one of my main concerns. I can turn wrenches all day, my soldering skills are lacking.
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Old 01-05-2019, 03:05 AM   #14
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Speedo, tach, temp etc. are unrelated to the ecu. However you will probably need to convert your tach signal, as you will have 2 more cylinders = more pulses.
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Old 01-05-2019, 12:19 PM   #15
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good info, the only other car I have done major wiring on was a 1967 vw beetle... so this is going to be a learning experience.
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Old 01-06-2019, 11:49 AM   #16
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Quote:
Originally Posted by Sjeng View Post
Speedo, tach, temp etc. are unrelated to the ecu. However you will probably need to convert your tach signal, as you will have 2 more cylinders = more pulses.
Will the 960 cluster work in a 940.

The t5 ecu output to the tach as a 4 cylinder signal surprisingly, it’s possible the stock ecu for the b6284 might too (doubtful but maybe).
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