I'm being 'forced' to consider induction. HA! HA! Get it?

[filthyjohn]

Ok then, one for all the tech-heads out there! After reading too much 'practical performance car' magazine, i've decided i need a cheap forced induction setup. i want to use a supercharger from a beemer mini, as they're cheap and cheerful.
Does anyboy know how many psi my b200 will be able to take? It's obviously low compression so i thought i'd easily get away with mild boost. How similar are the engine internals to the 2litre turbo from the 240? If they're similar, some conclusions could be drawn about strength perhaps. i can raise or lower the cubic flow rate with different sized pulleys, and i think the airflow meter will respond by upping the fuel accordingly, is this right? And is there a possibilty i'd need a better fuel pump/bigger injectors?
cheers,
john.

[jtbo]

Injectors are good to 148hp, maybe even less with turbo setup so you like to change those.

If you keep power under 250hp there is not much else to be changed, ignition should of course be adjustable, cheap solution is to get one from 240, get distributor, coil and ignition module.

Boost level depends of course from air temperature that goes to engine, biggest problem might come from pulleys as you need one to crankshaft end, you need toothed belt for supercharger. Also you need to keep it below 9000rpm at max engine speed.

I don't know if that thing even can push too much pressure to 2l engine, with intercooler 0.8bar is what I have heard ppl have been using, but you have to always make installation so that you start with 0.1-0.2bar and little by little go up, checking mixtures, checking detonation etc.

[filthyjohn]

Thanks for the help. I'd be totally happy with around 150hp, as that was what my beloved old cavalier had. that much in a lighter car would be great, and a nice even torque spread will help my drift ambitions. If it turned out i needed more power i could consider a VW G-charger or similar. As for the pulley, i'm good friends with a machinist

[SteveP]

If you only want 150bhp, why not just take a 2.0 turbo engine out of a 940 and run that as standard (155bhp). Far easier, with much greatier reliability.

[jtbo]

I would take 150hp from NA engine, would need just 740 turbo fuel pressure regulator(3 bar version), hot cam and little tweaking to head or just put bigger valves.

But supercharger is not too bad job to do, taking engine out is very big job, imo. For me at least installing megasquirt is far more easier than installing stock injection engine and efi, but some do have garages and other tools needed available for the job and then it might be easier, but changing engine alone is impossible, imo.

[classicswede]

I have thought about the BMW Mini supercharger but the reason why they cheap is because they are crap. If you want to increase boost pressure on a mini you have to upgade the charger.
The volvo engine will take much more boost than that unit can make.
If you want to do it go and do it - be different.

[foggyjames]

I wouldn't try to make boost on the stock EFI system. It'll most likely run massively lean early on, and the Renix system won't retard-in-boost like you need. Megasquirt is your friend.

If you're looking for something 'easy', I'd change to a 2.3 NA motor, preferably from a 940 which uses the same manifold, and it's EFI, unlike the 240/740 injection cars (yes, I know late ones were EFI, but 95% were mechanical).

cheers

James

[filthyjohn]

Hmmm. I'm swamped by ideas now. obviously the first choice would be a 2.3 TIC but that means taking the car off the road and I don't really want to do that soon. Not that it's outside my capabilities, i've swapped a couple of engines before and i'm about to start a project involving this:



and this:



The supercharger idea appealed because i wouldn't have to take the block out, but if i can't get any significant gain there's not much point. However, if the injection system can't take it, how about 4 bike carbs? Like the setup featured here A good session on the rolling road would surely have these sucking enough fuel to feed a decent charger like a G60 or a massive twin screw one from a merc.....would that be different enough?

[redline]

sorry to ba dense John , but what is that , my first thoughts were pontiac fiero but perhaos i'm way off the mark

[redline]

ok just read the photos image code and although I am right ,it is a fiero ,
I now feel a right numpty for not checking it first

must be one of the smallest yank cars ever made

[foggyjames]

I was also going to guess Fiero..glad I was right.

Bike carbs, injection ITBs, or conventional twin sidedrafts are all a cheap way of turboing.

You could +T the 2.0, y'know, same as you would with an SC. Fitting the EFI setup from a 940 2.0 Turbo would probably fuel you nicely for boost from a charger too, so that might be a good compromise.

cheers

James

[filthyjohn]

Yup, its an '85 fiero with a 2.5l throttle body injection 4cyl engine, producing a paltry 89Bhp! Hence the V8 plan. I'd seen fieros before and thought they were crap, but then i saw it on my mate's drive and had to have it. I'm sure some people on here know what that's like, when your drive's already full but you spot something you love and reason just goes out the window!
Oddly for a yank car it really handles, 43inches high and fully independent suspension make for a roll-free, grippy experience. All it needs is more power