HELP!! W123 euro M110 280E, Supercharging advice needed!!

[Frank-cj421]

Hello all,

I'm looking for some help an advice from anyone who has supercharged a M110, 9:1CR euro engine.

Right then, for the purposes of this question, treat me like an idiot (not hard I know...).
I'm looking for an idiots guide to supercharging.

I've got an Eaton M62 (I think), from a Merc CLK230 Kompressor, for my Merc (keep it in the family an all that).

I don't want to run big boost, I'm looking for around 8-10psi to start with, does that sound like a safe level to run?

A few details of my engine, etc..,

It's a Mercedes M110, 6 cylinder, capacity 2746cc, max rpm 6500.

I'm going to use an intercooler, and I've got a little piggy back ecu to run 2 extra injectors in the air intake to take care of fuelling issues from the Bosch mechanical injection system.

My first question to start with, how do I work out what pulley sizes/ratio I need?

Cheers Frank.

[PlaneCrazy]

What is the volumetric flow rate per revolution of the supercharger?

[Frank-cj421]

Hi PlaneCrazy,

It's 1.015litres(62 cu in).

[PlaneCrazy]

Originally Posted by Frank-cj421

Hi PlaneCrazy,

It's 1.015litres(62 cu in).

I'm not promising it'll be quick, but I'll do a calculation for you.

[PlaneCrazy]

In the mean time, here's someone who seems to have a similar idea to yours...

[Stretch]

Google says

Supercharger Information and Formulae

[PlaneCrazy]

I went to that site as well, but couldn't understand it.

I prefer to do these things from first principles, but the site I linked to didn't mention anything about power gains; however, he did a bit of work on boost vs. drive ratio.

[Frank-cj421]

That's really the info I need, using that info, I'm going to make a few crank pulleys, and start with a smaller 1 than I want, and then go from there.
I think it's better to start at a lower boost than I want, and go from there, it's better to be safe than sorry.

[Stretch]

You have to over fuel it though don't you? Even with a small boost it will be too lean. How are you going to tackle that?

[Frank-cj421]

I'm fitting 2 injectors in the air inlet, just before the metering flap, these are controlled by an ERL MF2 injector driver.
This works by taking an rpm signal, and a boost pressure signal, once it's been set up, it uses these 2 signals to determine the extra fuel require, then activates the extra injectors to suit.
The good thing about this is, it only works when there is boost pressure present, so I can use the supercharger's electric clutch pulley, to switch it of during normal driving.

So, in theory I will have the best of both, when using the car on the road I can simply switch off the supercharger, and drive he car as standard, then when I go to the track, or when the mood tes me, I can flip the switch, and let the supercharger come and play!!