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8 Series - E31 (1989 - 1999)

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  #1  
Old 12-11-2010, 06:37 PM
ChargedBMW ChargedBMW is offline
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Location: Scottsdale
 
Join Date: Aug 2005
Posts: 19
Mein Auto: Supercharged 330i, E38+31
Lightbulb 850i Tuning

Just picked up a 1991 850i and I'm very interested in seeing what others are doing for tuning these cars. I know that the S70 motor was used in the McLaren F1 with almost 600Hp - so needless to say there's room for improvement.

I was initially thinking the standard: Intake, Exhaust, Chip, etc. - but I would also like to do some internals work.

My last project was a E46 which I supercharged and tuned to over 400hp. That was fun! I'm hoping to stay NA with this one and still reach the 400Hp mark if I can. Anyone else tune one of these???

Thanks!!

-Karl
E38 Daily Driver
E31 Weekend Car
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  #2  
Old 12-12-2010, 11:25 AM
drivinfaster's Avatar
drivinfaster drivinfaster is online now
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Location: in the sticks you piney
 
Join Date: Nov 2007
Posts: 10,583
Mein Auto: rescued bmw's
uhh, no, you are mistaken. the s70 is not the f1 powerplant (as is assumed by most people). your e31 is an m70 (about 300hp 5L v12). here's a wiki...

http://en.wikipedia.org/wiki/BMW_8_Series_(E31)

what the wiki won't tell you is that the 850 is an expensive vhicle to own, and that you will only get minimal gains, if any, with chips, cai (don't even bother with these on this chassis), and exhaust. (mostly ear candy.....but nice ear candy )

cams would be good, but they're super expensive.

https://store.nexternal.com/vacmotor...113direct.aspx

check out some of the e31 forums and see what these guys are doing. most are going forced induction for hp gains, but it's an expensive game to play.

i suggest getting the suspension freshened up with upgraded bushings first, then upgrade the brakes. you'll get the most return from either of those than trying to squeeze what little you can from the powertrain.


df








oh, and pics or ban
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  #3  
Old 12-12-2010, 03:03 PM
TxGr8White TxGr8White is offline
Sick Puppy Motorwerks
Location: Dallas
 
Join Date: Jan 2010
Posts: 132
Mein Auto: BMW 850Ci
Quote:
Originally Posted by ChargedBMW View Post
Just picked up a 1991 850i and I'm very interested in seeing what others are doing for tuning these cars. I know that the S70 motor was used in the McLaren F1 with almost 600Hp - so needless to say there's room for improvement.

I was initially thinking the standard: Intake, Exhaust, Chip, etc. - but I would also like to do some internals work.

My last project was a E46 which I supercharged and tuned to over 400hp. That was fun! I'm hoping to stay NA with this one and still reach the 400Hp mark if I can. Anyone else tune one of these???

Thanks!!

-Karl
E38 Daily Driver
E31 Weekend Car
1. Get the WOKKE Version 2 chips set
2. The intakes CANNOT be made any better - as hard as you might not believe that.
3. Exhaust: several different options - none that produce HP (most actually rob you of HP)
4. Internals? Since you have an M70-engined 850, the best way is to get a twin turbo kit (as was built by DINAN - no longer available there) good for 525 HP; or a Supercharger from John in D.C.

You can also check here: http://forums.bimmerforums.com/forum...splay.php?f=55 , lots of info there. Good luck and welcome to the madness known as 8-ownership
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  #4  
Old 12-14-2010, 10:53 PM
ChargedBMW ChargedBMW is offline
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Location: Scottsdale
 
Join Date: Aug 2005
Posts: 19
Mein Auto: Supercharged 330i, E38+31
Thanks for the info!! The cams sound tasty but the price is a little scary! $1350 is a lot for a few ponies. I think I'll try a chip first and then perhaps a Super Charger. From reading the posts from the guys on the bimmerforums it sounds like it's a long process to get it done right. Fortunately I've had a little experience with my E46 which I supercharged. I would have figured that there would be more off the shelf toys for this one!! I have to say the sound from this beast is simply fantastic. I can't wait to get her cleaned up! I'll post pics soon. In the meantime here's a pic of my E46!! (Sold last year - current owner may still sell)
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  #5  
Old 05-12-2011, 08:03 AM
Simchief Simchief is offline
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Location: Florida
 
Join Date: May 2011
Posts: 1
Mein Auto: 1993 BMW 850Ci 6sp
I am Third owner of A 1993 850Ci six-speed.
Original owner added 1990 series DINAN chips and about 25,000 miles.
I replaced DINAN chips with WOKKE v2 and I am slowly going through car.
WOKKE chips might have added some HP; however real gain is improved throttle response and engine snappiness.
Remember 8 series are road touring cars known for effortless cruising and their low compression engine is very relaxed at 70-80 MPH. As delivered they are not 'sports cars'.
They have a smooth engine with good torque, I can start in 4th gear and car will accelerate smoothly.
Maintenance is straight-forward, it's the parts that get pricy.
Good luck with your project.
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  #6  
Old 05-27-2011, 11:49 PM
MrBahn MrBahn is offline
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Location: CA
 
Join Date: May 2011
Posts: 6
Mein Auto: 1993 BMW 850ci
850ci - Gentleman's GT

I agree the 850 is s gentleman's GT, meant to cruise from Munich to Geneve in absolute comfort, speed and style. I would like go with the Wokke 2 chipset, but I just got over some nasty EML issues, that turned out to be a shorted wire to the instrument cluster.

A hose clamp had shorted out the EML display light, and I was getting perpetual (EML, Trans Prgm Failure, Check Engine...) it was a nightnmare. I finally had to resort to the Stealer to out it on the factory computer and they found the short, $800 for the technical troubleshooting...worth it!

After a few months of stable driving, I may be ready to install a Wokke 2 chipset; the 850 is still not %100, and the '88 Porsche 928 S4 is the daily reliable driver these days. I want my 850 to be back in top shape, but the 928 is getting more attention...the 850 is jealous and acting up!
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