With a dyno shouldn't tuning the cam switch be super easy?
Run one run with the cam to switch at something stupid low, like 2500.
Then do one run with the cam at something very high, say 6500. The low switch will produce less power until that point. Switch at that point.

__________________
1993 190E 2.6 Sportline

whipplem104, yes, advancing/retarding the cams on our engines is a pita, due to the fact that you have to take the front cover off (a 30-40 min job). For my current setup 4500rpm is the optimal switch over point for the intake cam, before retarding the cams it was @ 6000 rpm. This can be seen in the lower graph. With 3000 and 5200rpm (my mistake in the above post) you can see how the power falls off which with the 4500rpm switch over is almost absent. You are absolutely right about the ignition timing, after I did the tests a upped the timing by 3 degs and the car runs like a dream and I think that ~5500 rpm I can add a bit more timing advance which should straighten out the curve .

MAG58, that is exactly what I did though not on a dyno but using the g-tech and doing runs in 3-rd gear from ~2000 rpm to read line. What I've found out is that even if the g-tech numbers don't match the dyno, the overall shape of the curve is very similar .

__________________
190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)

Tried to make some videos of the cars speedo while doing some acceleration test, here is result (two videos) .

Mercedes 190E 3.0-24v turbo - YouTube

Mercedes 190E 3.0-24v turbo - YouTube

P.S. rpms are a bit off, max rpms are ~7100

__________________
190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)

Yikes, that is VERY impressive and I love the pop off valve noise

I have finally reached the limit of the stock fuel pumps at ~ 13 psi (0.9 bar), so I dialed the boost down for the moment. Since the fuel pumps are setup in series I was thinking to modify them to a parallel setup, this theoretically should give me double the flow I have now. If this doesn't give me the required fuel flow I'll switch to a single bosch 044 pump.

__________________
190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)

I've just finished reading this thread. I'm going to start again! For reference - while in the UK I owned a Turbo Technics 300TE twin turbo. (You can guess another of my cars from my name.)

I'm also looking at a forced induction M103 in a 190E, only mine will have an automatic gearbox on the back of it. The reasons for this are twofold - the car came with an autobox (and it's much less hassle to use it than to change it) and the second reason is that my wife cannot drive a stick shift because of a back injury. I suppose I could go for a sequential box with a servo-actuated clutch, but...

Anyway, someone else had already done the engine conversion for me, swapping a 2.6 for a 3.0.

I'm starting from square one - I have very few parts so far. I do have oil sprayers and an oil pump from a OM603 (somehow these bits have got left over from another rebuild), but that'll be a long way down the line. Or whenever I'm doing appropriate work; certainly I don't plan to pull things apart just to fit these at this stage.

The turbo... A larger turbo moving more air at lower boost will (probably) have more lag... Not really what's wanted, especially with an autobox. Any thoughts on the viability of a twin turbo M103 in a W201? Or a VNT/VGT?

Intercooling, or water/alcohol injection?

For reference, I think that 300rwhp would be huge and I'll certainly not be aiming or planning anything higher at this stage.

Graham

The m103 responds very well to twin turbos. You should look over RBYCC threads :

http://www.peachparts.com/shopforum/performance-paddock/192014-m103-12v-turbotechnics-install-pix.html

http://www.peachparts.com/shopforum/performance-paddock/194005-turbotechnics-m103-12v-performance.html

http://www.peachparts.com/shopforum/performance-paddock/242911-300ce-turbotechnics-dyno-revisit.html

__________________
190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)

I've been trawling the forums for threads and info, but had somehow missed at least two of the links you posted. I'll have a good read through.

I'm also looking at the handling and braking aspects of any changes. W124 E400/420 brakes, Evo2 rear sway bar from Ake (and polybushes), cut down W124 TE front sway bar (I can't find a 500E bar here and shipping one just isn't economic)...

Went to a drag event today (the last for this year), here are the results

N___60ft____1/8 et____1/4 et___1/4 km/h

1___2.415___9.052___13.672___171.40
2___2.508___9.125___13.680___173.96
3___2.505___9.021___13.549___174.84
4___2.483___9.011___13.540___175.17
5___2.494___9.130___13.677___174.70
6___2.612___9.327___13.882___174.30
7___2.487___9.029___13.567___174.68

Boost pressure was 0.8 bar, street tires and fuel tank 3/4 full .

__________________
190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)

e36t, where are you based, i may have some parts you would be interested in.

pm me if you want to discuss whats and wheres!

__________________
ce 320 amg
widebody
tiwn turbo
Mutty 'der nail'
soon to be a six speed nail


"some mods improve your car and make it into something it never was, other mods, however, although essentially the same, are not, and make that car a ricer"

if your car isnt shiny, you dont know what you are talking about, remember; paint shine = knowledge. In order to be taken seriously, you should spend all your money on paint, (and get a dyno reading).
Dont forget to polish it often

Joreto,
Got to get that 60' down. You could be in the mid 12.--s with a 1.9- 60'.

Yes, my 60ft is awful, it might be due in part to the track (friends with AWD cars were running ~2.0 60ft) and part to the tires (street tires, 2nd season). All in all I'm pleased that the car runs very consistent times. Plan for this winter is to work on the rear end (fix the wheel hop, rebuild the LSD) and change the fuel pump so I can run a bit more boost ~ 1.2 - 1.3 bars.

P.S. here is a picture from the event, unfortunately I didn't have time to wash the car ...

__________________
190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)

rebuild the lsd? do you have the 210 asd diff?

Don't know the number but it's the original 2.5-16v diff.

__________________
190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)

Measured the exhaust back pressure post turbo, since I was interested how much the exhaust system contributes to it (usually it's measured pre turbo ) . At 0.8-0.9 bar (~11.6 - 13 psi) the exhaust back pressure peaks at 0.5-0.6bar (~7.35 - 8.2psi ) . This seems quite a lot to me, so next thing that I'll do is to modify the exhaust system and specifically the down pipe since it has a couple of bends which in my opinion are the cause of the high back pressure post turbo .

__________________
190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)