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Updating an M635csi Track Car to a Race Car

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GazM3
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Joined: Wed Oct 26, 2011 12:55 pm
Location: Melbourne, Australia

Re: Updating an M635csi Track Car to a Race Car

Post by GazM3 » Thu Aug 23, 2018 10:37 pm

Interesting direction change. Can understand to look group A with the intake but using ITB you would gain some serious power after 5000rpm. It would turn your 300bhp m30 into a 400bhp m30. Don’t the group2 e24 run m30 with ITB.

Also a company called RHD just doveloped a bolt in ITB “kit” so no more chasing unobtainable Paul Burke ITB adaptors.
BMW’s
74 2002 2.3ltr
84 E24 M635csi
94 E34 540i/6 SC
97 E36 M3 euro SC U/C

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VintageRacer
Posts: 36
Joined: Sat Jun 24, 2017 2:49 pm
Location: Waco, TX

Re: Updating an M635csi Track Car to a Race Car

Post by VintageRacer » Fri Sep 14, 2018 3:26 am

So I finally got around to doing a prototype adapter plate and managed to get a tko adapted to an M30. I posted the pictures to my Instagram account @rapidterrier.
Last edited by VintageRacer on Fri Sep 14, 2018 1:31 pm, edited 1 time in total.

VintageRacer
Posts: 36
Joined: Sat Jun 24, 2017 2:49 pm
Location: Waco, TX

Re: Updating an M635csi Track Car to a Race Car

Post by VintageRacer » Fri Sep 14, 2018 1:29 pm

Trans.jpg
Trans.jpg (104.57 KiB) Viewed 117 times
Engine trans.jpg
Engine trans.jpg (101.76 KiB) Viewed 117 times

Shipper 01
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Location: Sydney Australia

Re: Updating an M635csi Track Car to a Race Car

Post by Shipper 01 » Mon Sep 17, 2018 5:40 am

Vintage,

I had my M30 race engine built by Pip Barker from the JPS racing team. He guarantees 330hp with the stock M30B34. No internal dimensional changes permitted, stock Group A only. Mine is taken to 3.6 litres, has Group C pistons, S14 Rods, a B35 head all ported and with combustion chamber work and big 314 degree CatCams. Dyno is actually tomorrow onwards and with triple 45 DCOE's we are hoping 330hp to 350hp. With 50DCOE's it would probably run to 370hp although be less drive-able. So I believe you'll get 300 plus hp.

My current engine is here. https://www.bimmerforums.com/forum/show ... acer/page6

I forgot to ask, what's faster? The jag or the bimmer??

VintageRacer
Posts: 36
Joined: Sat Jun 24, 2017 2:49 pm
Location: Waco, TX

Re: Updating an M635csi Track Car to a Race Car

Post by VintageRacer » Tue Sep 18, 2018 9:40 am

The Jag is heavier but has a lot more torque with the V12. The BMW does turn faster lap times at Road America. We'll be running at COTA in a few weeks and I expect the BMW to do a bit better with the high revving S38. I've been keeping the rev limiter at 6000 to preserve the motor but I'm going to bump it up to 6750 for the COTA race.

I'd love to have someone like that build up my motor but shipping a motor down to Oz and back would be cost prohibitive.

Do you happen to have the cam card specs for the group A cam and the piston specs? So far I'm just guessing on the compression ratio and cams basically going as big as possible and high as 110 race gas will allow to make the most power but I'd like to get as close to Group A spec as possible,

Shipper 01
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Joined: Mon Nov 03, 2008 5:26 am
Location: Sydney Australia

Re: Updating an M635csi Track Car to a Race Car

Post by Shipper 01 » Tue Sep 18, 2018 11:12 pm

Vint,

I can get them for you if you want. Although the CatCam 314 grind is said to be an almost direct replacement for the Group A and single valve Group C cam. See here; http://www.catcams.co.uk/acatalog/BMW_M ... gines.html

The catcams are apparently ground in Belgium so are not a shelf item.

Significant work is done to the combustion chamber and this is crucial to big hp. Funnily enough huge compression is not required to get the best hp possible. We see it all the time on line but Pip usually states 10.5 to 11.5 :1 is sufficient. Prior to finishing my engine he re-freshened up the spare engine for a JPS Group A car bought by someone in the USA. Again he needs to guarantee 330hp and appears to always achieve it.

An engine by Pip, as of today costs around AUD $13.5k. Postage would be upwards of AUD$1k. For this you get a $25k engine with original Group A & C parts along with a modern B35 head. If you decide to stroke it like I did or, increase capacity then you are looking closer to 370hp with a stand alone ECU. It may even be more. There are 4 litre stroker kits available here in Australia.

My pistons were sold to a mate of Pips back in the 80's when Australia went from Group C to the World Group A configuration. Best thing we ever did in racing. In building my engine last year he called his mate up in NZ and bought them back for the same price he sold them for in the 80's. The original JPS head guy living in Canberra does the combustion chambers. When he's gone that art will be lost.

Anyway, let me know what specs you are after and I can chase them down for you. Love that M635CSi. You should be able to take it to 7250rpm. My endurance S38B38 that is currently idol on the bench dyno will apparently be taken to 8500rpm. I do have the benefit of the dyno guy being the engine builder however and knowing what's going on inside.

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