Messages

1

Engine + Driveline / Engine tuning M42B18

« on: February 13, 2012, 03:32:06 PM »

The dyno run was good today. I've got 152hp at 6000 rpm and 187,5Nm torque at 5400 rpm, and thats about what I hoped for.  Great mix all over, and good driveability from 4500 to 6500 so overall very positive. I'm really looking  forward to race it now!

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Engine + Driveline / Engine tuning M42B18

« on: February 09, 2012, 12:23:50 AM »

Exellent! No problem. I was afraid I had to write it all over again. (I was very tired last night, so please forvgive my harshness

Edit: was ment for DesktopDave

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Engine + Driveline / Engine tuning M42B18

« on: February 08, 2012, 05:03:22 PM »

Ok, mods! I wrote a long message with high level ratio math and reasearch. It had to be "passed by a moderator" to be posted on the forum. The last time I got this message, my two messages "dissappeared" Hope it won't this time...

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Engine + Driveline / Engine tuning M42B18

« on: February 08, 2012, 04:47:48 PM »

Ok, if I've got it right my 240 tranny has this ratio
1st- 3,764
2nd- 2,00
3rd- 1,33
4th- 1,00
5th- 0,81

And this sound like a "not too bad for rallying"-ratio, right? Does there exsist 240's with different ratios? Or is it bulletproof that this is my ratio when I've got a 240?

It says on the housing, right side bellhouse 240.0.0370 90' and rear housing 240.0.0366 91
And 225 and 1.4.

I've also got a 220 from an E36 lying around, and I think this is the same as the 250. This is considered to be a "close ratio" tranny, but I just can't understand why, considering the ratio
1st-4.23
2nd- 2.52
3rd-1.66
4th-1.22
5th-1.00

With my 4.10 diff ratio the insanly low 1st will be completly useless with the 220, and 95% of rallydriving will be in 2nd, 3rd and 4th. The difference between 2nd to 3rd will be 0.86 (0.67 with the 240) from 3rd to 4th 0.44 (0.33 with the 240) short story, the ratio"gaps" is considerably bigger with the 220, than the 240

Am I completly lost in my theories (or math) here? Please enlighten me...

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Engine + Driveline / Engine tuning M42B18

« on: February 07, 2012, 07:28:14 AM »

Yes, you're completly right, of course!

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Engine + Driveline / Engine tuning M42B18

« on: February 07, 2012, 05:22:59 AM »

I have a 90" E30. The 4th is 1:1' and the 5th I think is 1:1.4. What I need is a gearbox with a high ratio 1st and 1:1 on 5th.

Dyno is due on Monday

7

Engine + Driveline / Engine tuning M42B18

« on: February 06, 2012, 04:59:41 PM »

So, now the engine is in the car, started, and braked in. I took it for a test run now, and I'm very satisfied with the result. It idles like a tractor, though, but I'll look into that later. It idled bad before I took it apart, so that doesn't worry me much. I don't think I've lost too much in the lower register, and passing 5000 rpm its hysterical! Now the need for a new gearbox is starting to get clear! I had to change the original gearbox, and I got what i thought was an identical box, but it's obviously not. Still it is a Getrag 240, but the range is definitive not meant for rallying. Any good ideas?

I hope to get a dyno run this week. Exited! It feels like 150+hp, but you'll never know...

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Engine + Driveline / Engine tuning M42B18

« on: January 30, 2012, 01:32:52 PM »

Thats a great train ride!

I hope to get the parts and have it assembled during next week, so a dyno run is in the nearby future Any guess what power I'll be looking at??

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Engine + Driveline / Engine tuning M42B18

« on: January 30, 2012, 10:01:45 AM »

Thats exactly what my setup will be. 269dg cat cams, and a matching chip from motor nord in sweden.

I'm from the south/east of norway, 1 hour drive west from Oslo

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Engine + Driveline / Engine tuning M42B18

« on: January 28, 2012, 12:52:07 PM »

Ok. Thats what I thougth.

11

Engine + Driveline / Engine tuning M42B18

« on: January 28, 2012, 03:51:47 AM »

Yes, electric fan is fittet, no power steering, no A/C. Rally springs and shocks is fitter, I've done a few rallies with it, and it handles great. All bushings are stock, and they are in great shape. Rallies in Norway mainly runs on "bad"  roads, with potholes, bumps and jumps, on gravel or snow/ice surfaces. I belive that rubber is the best materials for bushings etc., plastic will be too hard, and cracks in mounts in chassis often appear on the cars that runs with plastic bushings.

What is a guibo??

12

Engine + Driveline / Engine tuning M42B18

« on: January 24, 2012, 10:50:05 AM »

Thanks everyone. I've just ordered A set of 269dg Cat Cams and a matching chip from Motor Nord in Sweden, and a new set of piston rings and bearings is fitted, along with cylinder honing I think this will do for now. Anyone with a qualyfied guess on what power I'll be looking at?? I'll take it to the dyno afterwards, mostly to see if the mix i right, but I'm also curious on the power, of course...

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Engine + Driveline / Engine tuning M42B18

« on: January 17, 2012, 03:00:07 AM »

Stroking is not allowed, and it will be checked from time to time at scrutening. The car already have the 4.1 diff ratio. And I will of coure change all gaskets while I have it apart. CF hood is not allowed, and the weight is already on its minimum.

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Engine + Driveline / Engine tuning M42B18

« on: January 16, 2012, 02:44:10 PM »

Hi.
I have a 90" 318is rally car that I could use more power in. I have dismatled the engine for a check, and it looked good inside. I'm going to fit new pistonrings, but the bearings looks brand new, so they will do for now. I'm thinking about a new set of cams, any good suggertions?

I'm also hoping to use the standard FI, maybe fit bigger injectors, and turn up the fuel pressure. Will this work?

Any other ideas on how to get more power, will be appreciated.

No turbo or supercharger are allowed.

(sorry for my "Petter Solberg-english". I had, like him, my mind on rally when I was in school)