I've been reading up about turbo conversions on here and I've decided it's the way I want to go. The engine will be a low comp M20B25 (I just need to go and get it now). I do intend on giving the car a good bit stick on track days, but it will mostly be used as a road car (and a daily driver!)
Firstly, I've come across this; http://cgi.ebay.co.uk/BMW-E30-323-325-3 ... 2c58e4bc56 manifold. It looks pretty good though it seems a bit cheap, should I be worried?
Secondly, turbo choice. I'm looking at a hybrid TD04-18T (IIRC), from my SAAB turbo days, these were the ones to have, it's basically a GT28RS compressor on the Mitsi turbine and more importantly they can be had fairly cheap. I would need to convert the manifold to a T25 flange, I'm a machinist so that part isn't a problem. I'm aiming for a useable 300bhp, I know on a 2.0/2.3 SAAB they can push 350bhp on the right hardware. Boost might be 1.2-1.5bar, is that too much?
This is the compressor map I'm looking at; http://www.not2fast.com/turbo/maps/gt28rscompress.gif, I think I'm doing it right!
Lastly, the other things I'll be gathering are M30 injectors, M30 AFM or maybe even a MAF and a relevant chip. I just want to keep it on the OE management for now, though I'd be looking to move to M-Tech or Megasquirt when funds allow.
The clutch will be replaced for the best one I can afford at the time.
The intercooler and plumbing will be looked at nearer the time.
Is there anything else I've missed out?
One or two turbo questions
Moderator: martauto
You´ll not need that much boost for 300hp.
The M30 AFM is not going to be able to measure 300hp very well.
You´ll need a MAF capable or a rising rate fuel pressure regulator.
The M30 injectors will not either work by them selves without a rising rate regulator and even then it´s pushing it a bit.
The M30 AFM is not going to be able to measure 300hp very well.
You´ll need a MAF capable or a rising rate fuel pressure regulator.
The M30 injectors will not either work by them selves without a rising rate regulator and even then it´s pushing it a bit.
Should I just bite the bullet and get the M-Tech or similar and couple it with a MAP sensor (maybe a SAAB one?!).
That's good to know on the boost front. As for injectors, I've seen Audi ones used elsewhere. I gather that with an aftermarket ECU, using different injectors from another car isn't a problem, given any changes in resistance can be catered for?
Can the RRFPR be had from another similar engine or is there a suitable aftermarket one?
That's good to know on the boost front. As for injectors, I've seen Audi ones used elsewhere. I gather that with an aftermarket ECU, using different injectors from another car isn't a problem, given any changes in resistance can be catered for?
Can the RRFPR be had from another similar engine or is there a suitable aftermarket one?
You CAN use larger injectors in the motronic if your tuner knows how to handle that.
You just need to have the ability to measure all of the airflow.
Looking at the V4 Mtech ecu, I´d reccomend a VEMS ecu that comes with a built in wideband controller and sensor for 580pounds (vat inclusive). Totally a better ecu with loads more features, inputs and outputs.
funny that VEMS is now cheaper then Megasquirt equivalents.
You just need to have the ability to measure all of the airflow.
Looking at the V4 Mtech ecu, I´d reccomend a VEMS ecu that comes with a built in wideband controller and sensor for 580pounds (vat inclusive). Totally a better ecu with loads more features, inputs and outputs.
funny that VEMS is now cheaper then Megasquirt equivalents.
Back to this, I *might* have my hands on M Tech, not sure on the version yet but it should be nice and cheap. I know someone who knows someone that knows someone who is the someone that either developed or helped develop the software. Not sure how yet, but it might help me!
It might be a longer project than I originally intended - getting my engineering business off the ground is this years goal
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It might be a longer project than I originally intended - getting my engineering business off the ground is this years goal
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