Got my M45

[hoshy]

Hi all,

Finally I've got my Eaton M45 supercharger!!

Of course, my car is in storage 200miles away, I have no management system and haven't a clue how to actually bolt the thing in... but progress is progress

[jonbuoy]

Well done mate
When will you be able to get back on the road?

[hoshy]

Should get the car back in Jan. Then main work will be around testing the fabled MAF conversion. Then it'll be time for the supercharger. probably just in time for next year's holiday.

you guys think I can dual fuel the m40 w/ m45 charger - get an LPG tank in the back ?

[e30_Turbo]

I'm adding boost control and water injection to your MS dude, that coupled with the sparks makes it on par with the V3.

I've gotta re-wire the whole thing for the upgrade so it'll be after the next batch of tuning is done.

Have you made out a shopping list yet?

Mark.

[e30_Turbo]

[hoshy]

Nice one Mark - I like how you call it my MS already

as for a shopping list I'm still only thinking through what I'll need. so far I've got the following,

1. Crank pulley - got no idea about this - need to find that maths on how to spec them. Need to see if I can mopdify a cooper S one
2. belt
3. fabricate mounting brackets
4. pos. move alternator ant mentioned some brackets that would allow me to stick it on the other side of the block
5. adaptor / pipework to get the the air in ond out of the charger - again I'll be looking to cooper S parts to help.

I'm not going to intercool in phase one so that should simplify the mechanical side a little. I presume the Cooper S is intercool as standard? I've never even seen the engine bay - must find one and take a peek

Seems simple but it will be the first time I've done anything like this !

your exhaust is awesome btw

[hoshy]

ah - as for the pics. I'll put some up soon but the thing is still in the boot of my workmate's car. but i took a look at it yesterday and everything seems good.

[stevetigger]

Im thinking supercharger next year for my M50, so.......Lets talk.

And when you next in Shrewsbury?

I am going to go round ya Dad's for a power test!

Can I still get it for a bargain price?

[Turbo-Brown]

Hey Hoshy, how's it going?

Just a thought on the crank pulley: Think if you use the Mini one, you'll end up without much boost as the Mini engine is smaller than the one you're supercharging which means you need to spin the 'charger faster in order to achieve the same boost.

[320Touring]

Hey dude-thats good news.get it done!

Just a thought on the crank pulley: Think if you use the Mini one, you'll end up without much boost as the Mini engine is smaller than the one you're supercharging which means you need to spin the 'charger faster in order to achieve the same boost.

would it not just be possible to change the pulley on the charger for a smaller one- thus making the crank:charger ratio bigger, rather than trying to find a bespoke crank pulley?

[hoshy]

Hey Hoshy, how's it going?

Just a thought on the crank pulley: Think if you use the Mini one, you'll end up without much boost as the Mini engine is smaller than the one you're supercharging which means you need to spin the 'charger faster in order to achieve the same boost.

That's a good point! Though I might be able to use the off-the shelf -15% charger pulley to help compensate?

[hoshy]

lol - just read Neil's post now

[hoshy]

The other thing I was wondering. You guys think I could hook up a MAP in the same way I'm planning on doing the MAF conversion? I'm gonna go MS for sure, but it would be nice to at least have the charger running for a while on my own electronics

[Turbo-Brown]

W
Would it not just be possible to change the pulley on the charger for a smaller one- thus making the crank:charger ratio bigger, rather than trying to find a bespoke crank pulley?

Yeah should be, but there will be a minimum radius you can go to which you'd need to investigate before commiting to that route.

[hoshy]

I guess this is one of the downfalls of a supercharger. fixed boost unless you change the pulley. I'll have a look through the other m42 supercharger thread I know there's some good info there. Maybe I can figure out how much boost I can expect from the various combinations of OEM parts. I'd much rather start with them than go bespoke.

[Turbo-Brown]

Probably easier if you can use OE bits, but if you need anything turning up then gimme a shout!

[e30_Turbo]

Probably easier if you can use OE bits, but if you need anything turning up then gimme a shout!

I'm sure Lennie might have a few he knocked up laying about too

[hoshy]

Thanks guys!!

[Jos]

Sorry been a way for a while, what engine is the M45 for? I had a look at Eaton for my 3.5 and the only one with enough CFM was the monster M112.

Yes you can use a smaller crank pulley to spin the charger faster, but keep in mind there is a maximum speed on the Supercharger itself and as stated a minimum radius for the belts. If you have access to a lathe + mill then making pulleys isn't that hard and you could replace the one on the blower too if the crank pulley is going to end up too small.

I am currently looking at an ATI Procharger centrifugal supercharger instead which have much higher CFM and are a smaller unit, also less parasitic heat and less crank loss. Totally different power profile though, bit like a turbo with no turbo lag

[Andy335Touring]

I am currently looking at an ATI Procharger centrifugal supercharger instead which have much higher CFM and are a smaller unit, also less parasitic heat and less crank loss. Totally different power profile though, bit like a turbo with no turbo lag

You want a Jag XJR(?) super charger for the M30, 360-400 ponies

[Turbo-Brown]

You do still get lag of a sort with the centrifugal superchargers as they're not efficient air pumps as very low speeds, but the boost you get should be very consistent with revs/throttle openings. You can also keep your throttle where it is without the need to vent the boost piping when the throttle's closed

You want a Jag XJR(?) super charger for the M30, 360-400 ponies

Or two M45s

Two is always better than one!

[Andy335Touring]

You want a Jag XJR(?) super charger for the M30, 360-400 ponies

Or two M45s

Two is always better than one!

Unitil your there stood by your engine bay scratching your head thinking how the hell am i going to plumb/mount/drive belt these two super chargers !

Old army acronym, KISS

[Jos]

That was the issue I had with the M112, it's a bloody big lump..

TBrown, it's not really lag as such as the engine at that point is working as it would be if it was NA, turbo lag comes from backpressure on the exhaust section which doesn't happen on a centrifugal, they behave almost the same as a turbo (it's basically a turbo with a belt instead of a turbine).

As far as smooth progression, hmm not sure, I chatted with my dad about this (marine diesel engineer) and he recons it will be like a turbo coming on boost but much harsher, turbos spool quite gently due to the actual temperature of the exhaust gas (apparently its the temp not the airflow that makes turbos spool quickly) not being that high in lower gears as load is low. Recons this will need an adjustable boost controller or a progressive to stop it from fishtailing when the blower kicks in o.O. Read a little about them on the Dodge Viper nutter forums, 1400bhp and they were having issues with the cars breaking traction at 130mph when it spooled up!

The reason for going this route is the plumbing is easy, control is easy and hey.. it's a little different. and yeah 400 moopower is the ballpark I am aiming at

As for 2 M45's.. you would need a periscope to see over the 'power bump'

[Turbo-Brown]

Does turbo lag come from some exhaust pressure phenomenon, of just the fact that the turbines drop right out of their efficient pumping range with the throttle shut and take a finite time to get back into that range when it opens again?

Have to admit to having no practical experience of centrifugal superghargers, but it occurs to me that their speed will be related to engine speed and so the rate at which the compressor wheel can accelerate is goverened by the rate of acceleration of the crank and that boost is related to engine speed.

With a turbo, the compressor speed is largely independant of engine speed giving that situation where you floor it from standing in 1st, take off down the road and then BANG get wheelspin as the turbo spools up to give full boost.

Anyway, I reckon you could get an M45 down each side of the block if you could live without PAS and the like