Twin Turbo 850CSi?????? - The Unofficial BMW M5 Messageboard (m5board.com)

bmw_maniac · 6th June 2002, 03:15

Hello,

I know this topic has pooped up before, but I thought I might start it off again.

Does anyone have any Pictures and/or Performance specs?

The thing is, eventually I will probably have a Twin Turbo 3 series Convertible as a Daily Driver, and get either the old 850CSi, or if they make the new 8 series, I will get one of them and fully race kit it. Strip it down, race seats, high powered engine, extend fuel tank into boot for thirsty turbo engine etc......

Thanks.

CarlT · 8th June 2002, 11:58

Hi

Dinan in the USA made a very successful Twin Turbo version of the M70 5.0 V12. The Specs where around 550hp and close to 500 foot pounds if memory serves me right. (Sorry if I get this wrong, it is 1:30 in the morning....)

I haven't seen a TT verson of the CSi, this might be due to the fact that the CSi has a higher compression ratio.

If you plan on building a "rocket", I'd go for a different car as the E31 is a heavy beast no matter what you do... Sure you can throw out the seats, half the interior, carbon fiber this and that.... But you'll still have a 1500kg + car that wasn't built for track use.

For track use I'd get a E30 or E36 and sink my money into it. Of course you still need the CSi in the garage for the weekend Autobahn storming...

Regards
Carl

bmw_maniac · 8th June 2002, 12:23

well i'm lookin at puttin SERIOUS money into it, and I don't really care if its still quite heavy, cos I like the look of it, and it's a V12!!

I was talkin to my uncle, and he said if you spend enough money on it, you could probably get 1000hp without NOS. (Imagine the boost!)

tfung · 8th June 2002, 12:56

Quote:

Originally posted by bmw_maniac
well i'm lookin at puttin SERIOUS money into it, and I don't really care if its still quite heavy, cos I like the look of it, and it's a V12!!

you might want to try to replace the entire engine block with a race prepped V12...

Ferrari-Bmw · 8th June 2002, 18:59

Why not try HARTGE they made one off a kind in the
early nineties I have personally seen that car down in
Beckingen in Germany many years ago
E-31 850 5.0 L Quad-Turbo 500 hp nm/

???
and if i am not correct they have a M-70 Quad-Turbo for demonstration in the lobby,,

ps. in july 1991 i testdrove a 325i E-30 205 hp that was a blast
at that time ,,, very short run- but is intergraded deeply in my memories ....

CarlT · 8th June 2002, 21:26

Quote:

Originally posted by Ferrari-Bmw
if i am not correct they have a M-70 Quad-Turbo for demonstration in the lobby,,

I was there last year with the BMWM5 Tour and there was no such engine in the lobby. I would have remembered

Quote:

Originally posted by BMW Maniac

Well i'm lookin at puttin SERIOUS money into it, and I don't really care if its still quite heavy, cos I like the look of it, and it's a V12!!
I was talkin to my uncle, and he said if you spend enough money on it, you could probably get 1000hp without NOS

Well I think you might be a little optimistic on the hp numbers even if you do throw a lot of money at it. I know of a current project of designing 4 valve heads for the S70 engine+ a lot of other goodies, higher ratios, larger bore, lightened this and that +++. Target hp is 650-700hp normal aspirated. Price $80000. According to the designer, that is more of less the limit of the design of the engine.

NOS has been tried on a stock M70 engine with very effective results, until the engine threw a tierod...

Keep us informed on your progress on a TT/Quad turbo charged CSi, I'd love you see the results

Carl

JetBoy · 8th June 2002, 22:30

Please don't destroy a CSI in that way. It is a rare car.

If you like V12s why not put it into an E30 or E36. It has been done...so it is possible.

Good luck !

bmw_maniac · 9th June 2002, 05:17

ha, this project is along way off yet. first i need a job, and a license. by then the 8 series will be soooo old that it wouldn't be worth it. anyone know whats happening about the new 8 series coming out in the next 2 years?

BlueBiturbo · 9th June 2002, 05:42

Quote:

Originally posted by CarlT

I was there last year with the BMWM5 Tour and there was no such engine in the lobby. I would have remembered

Carl

Carl,

I had the Hartge Brochure which showed a Quad-Turbo 850i with Hartge's wide body kit. I think the engine was halted at the concept stage thus never made it into production... pity though.

BTW I believe someone did show us a link to a pic of a black Dinan 850 CSi Twin-Turbo liteweight with custom front nose (no pop-up headlite) and underbody diffuser. The car is CA street legal and has a power of around 600+ ps.

bmw_maniac · 9th June 2002, 05:52

Quote:

Originally posted by BlueBiturbo

BTW I believe someone did show us a link to a pic of a black Dinan 850 CSi Twin-Turbo liteweight with custom front nose (no pop-up headlite) and underbody diffuser. The car is CA street legal and has a power of around 600+ ps.

There is one here: go to http://www.clube31.com and then find Dinan on the left hand side under Tuners. I think this one has 500-550hp.