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E31 850 CSi and E24 M635 CSi M635 CSi (E24) 1983-89 and 850 CSi (E31) 1992-96. The Ultimate Grand Turismo by BMW M.

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post #61 of 86 Old 20th February 2013, 08:22 AM
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Originally Posted by bmwmtechnike24 View Post
thank you for the info

maybey they have put to much boost on the engine or bad quality head gaskets.
I think with the new type geskets,and when not going higher then 1 bar the engine will last longer.
I will post pics soon of the build.

greatings


ruben
If you read that article, I believe that Dinan used a custom built copper head gasket and SS O-ringed the head. The cylinders are very close together so getting a good seal is very difficult. Compression was reduced to 7.8 from the stock 10.5. To get the low compression Steve Dinan had custom pistons built. They relocated the AFM to the right side so they could install an intercooler where the stock air filter is.

I actually took a ride in the turbo car in the article with Steve Dinan just after he finished the product. I was at Dinan Engineering asking about the stroker 3.8 L version he was also building. The turbo was EXTREMELY expensive at $20K OVER the base price of a car, and in the mid to late 80's this was really big money.

I'm sure some of the longevity problems where related to the low octane gas we have here in the US, as well as the problems getting 400 HP worth of fuel using that Bosch AFM. I know that with my car we are maxing out that AFM at 375 HP, so no matter how you tune the EPROM chips (or add larger flow injectors) you still cannot get linear airflow measurement if the AFM is mechanically maxed out against its stops. If you toss the Bosch fuel system and go to a Motec or similar system you can probably get around the fuel delivery problems. I have seen systems that use an E39 M5 style AFM with custom electronics to get higher airflow rates and higher HP.

Speaking with Frank Fahey about this (his shop has seen a number of blown Dinan turbo S38s) he suggested using a Mega Squirt or similar fuel injection/engine management system. Some do not even need a MAF as the use manifold pressure sensors, throttle position sensors, and RPM to determine fuel. He also suggests the use of an aux methanol system to quench detonation

Last edited by dhl93449; 20th February 2013 at 10:38 PM.
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post #62 of 86 Old 4th November 2013, 03:19 AM
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post #63 of 86 Old 6th November 2013, 08:36 PM
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Hi.One more M635CSI owner here.From Norway.My car is Hennared and has VIN nr 1050005 and are probably the oldest M635 that exist.
It`s produced nowember 3.in 1983 and owned by BMW AG from new to ca sept 1985.Imported to Norway 1995.In wey good condition.
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post #64 of 86 Old 6th November 2013, 09:25 PM
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bmw m635csi

Very Nice car

this car looks super good.red is a good colour to for the e24.especially with the chrome and the rs wheels and the full mtechnic bodykit.

greatings from Belgium.

Ruben
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post #65 of 86 Old 7th November 2013, 05:28 AM
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I've never seen one in Hennarot before - looks like a very nice example.
Thanks for posting.
What is the current mileage?

Previous:
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post #66 of 86 Old 9th December 2013, 02:54 AM
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I have a 1985 M635csi cosmos blue/anthracite buffalo. 92k miles. Located in Connecticut.
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post #67 of 86 Old 9th December 2013, 05:33 PM
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I have a 1985 M635csi cosmos blue/anthracite buffalo. 92k miles. Located in Connecticut.
Would like to see some pics of the cosmos blue/anthracite buffalo, I have alpine white with brown buffalo.
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post #68 of 86 Old 10th December 2013, 01:35 AM
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Enoksen,

Beautiful car. Congratulations on the very early example. Can you tell us the mileage?

Regards,
Slfan

1985 M635 CSI
1988 M3
1988 M5
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post #69 of 86 Old 10th December 2013, 09:29 AM
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Fellows,

Here are some pictures of the M635CSI I recently purchased. With the exception of the wheels, radio and shifter, the remainder of the car is stock.













Car spent it's life in California and is now in Miami.

Regards,

Slfan

1985 M635 CSI
1988 M3
1988 M5
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post #70 of 86 Old 3rd January 2014, 05:06 PM
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Sorry for late response.My Hennared M635csi has 143000km on the meter.I have no garanties for that it is right,but i have no reason to doubt it either.
The only "negative ?" about the car,is that it was imported from Germany i 1995 with some small body damages.Some special Norwegian import rules made it possible to use an 635csi with Norwegian papers and splice(not sure if it is the right english word,but the norw back bodyparts was welded to th M.)to tis car.This had to be done by authorized garages and only with papers from the authoroties .They follow the process before,under and after and write the registration papers ONLY if they have the measuring papers from the aut.garage.So nothing else than the sidepanels,backplate and the thrunk are from the Norw.car.The garage also had to characterize the VIN nr from the norw car on to the firewall on the M.But it had to be done with their tools and one from the authoreties were watching. So the reg papers says:BMW 635csi VIN nr ..... approved spliced with BMW M635CSI with VIN 1050005.All this had to be done in agreement with norwegian car authorities and BMW.I dont know if this were special rules for Norway,but anyway.BTW If someone would import a M635csi to Norway in 1995,it would be approx 20-25000Euro only in taxes.Pluss the price of the car.
I would like to hear your opinions and questions about the car,about rules for splice,value for this vs original.Or anything thats on your mind.(both pos and negative).
Best regards
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