A M R wrote:^^^ mate, stop gunning him (well, his car).
You might like re-read...I wasn't having a go at anyone here. I'm not enough of a prick to be rude about people's cars 'to their face' like that.
Fuse's solution is just fine (in fact it's better than I thought! Never seen those pics before...that thing is pimp!)...it's like an old-school piggyback.
There's a big difference between electronically fooling an ECU in a controlled manner (i.e. a piggyback) and 'hacking it around'. People do all sorts of stuff like adding clamping diodes to the AMM (to prevent boost cut...but it also prevents the ECU adding any extra fuel) then using an on/off pressure switch to trigger extra injectors. The precision involved is pretty damn low.
There's a guy on Turbobricks who had extra injectors wired to a series of switches on the dashboard for when he ran out of fuel at higher RPM for the boost he was running. After he toasted the fourth engine, he realised that was a stupid idea.
That's what I'm trying to avoid - people ghetto-hacking, and blowing their shit up. There's a school of thought (particularly at the ultra-low-budget end of the scene) which says that that sort of thing is ok, but I try to pursued people that that's not the way to do it.
Having read some of the local 'cruise' forums, it's no wonder to me that RS Turbos and GT Turbos have with a reputation for blowing up, what with some of the stupid stuff people try. Accurate tuning is totally the key to 'safe' power. The "set in stone" power limits for certain engines have been shifted up by 50-100hp with the advent of more affordable programmable engine management systems.
The route I'd suggest for people on a budget would be Megasquirt. It costs about £150, plus your time to work out how it works, how to tune it, and how to wire it in. It's not that hard, but it requires time and dedication. If you're not willing to put that in, I'd suggest you're not ready for the work a tuned car involves. Or to put it another way, I seem to waste far too much of my time re-doing jobs where corners have been cut in the past. Personally (when I get my arse in gear to actually do something!), I do it once and do it right.
Fairly often people try to say "can't I just boost on LE-Jet", and the answer is simply no, not in any meaningful way. You might be able to run 2psi safely, but with no guarrantee of extra fuel (especially at high RPM) and no retard-on-boost thanks to an NA Renix unit...you're not going to be able to boost enough to make it worth the effort.
Going back to our original poster, I suggested it might be an idea to look at the 'boost kit' for his carb. Being a B19 carb engine (with the 1.75" Stromberg, at a guess), there's almost certainly a "B19AT" carb kit available from many carb specialists, which would provide the fuelling for his setup, using parts he pretty much already has. EFI would be better, but in this fairly unique situation, building a 'B19AT' might actually be easier, especially if our man has a working knowledge of carbs but not EFI.
I really don't want to come across as a know-it-all prick. My car runs twin 40s, and they're really badly tuned in the progression stage...I hope I don't come across as preaching because I don't practice it

To be fair, I just need
time to tune my car, but I seem to have been busy for the last 6 months! What I'm trying to do is prevent people from starting out down a road which I've seen lead to misery.
Take Ali with his drift car...if he drops the B200FT lump in complete with LH2.4 management, it should work exactly the same as if it were in a 940 (which, let's be honest, are hardly famed for being unreliable!)....whereas he was thinking originally (I think...apologies to Ali if I've got this wrong) of sticking with LE and Renix, which then starts you out down a road of having to retro-fit an alternative system, and having the car out of action while you sort it out. People have been there before, and it's well documented, so I suggest we learn from that 'research', and get it right first time. As I see it, some extra leg-work up front gets us a 'factory' result, which makes it a no-brainer to me.
Ah crap, that turned into a huuuuge post
cheers
James