Have got a Janspeed manifold and a TD04 turbo, the main stumbling point at the moment is that Janspeed used a suck though set up with a big SU sat on the inlet to the turbo and I really don't fancy putting LPG through the turbo (+ it gives a really long inlet tract which is never good with gas anyway)- I know it should be OK and that obviously it was working with petrol but it just seems wrong, hence am on the look out for an EFI manifold and the associated bits so I can add the gas after the turbo. I friend is running the same set up in his Westfield track day car and has been using upto 25psi boost on stock 205 block HC pinto internals which was pushing somewhere near 180?bhp, its going to destroy pistons at some point soon though.
My main problem is lack of time and working space.
I use to have an RS2000 with a Janspeed turbo many years ago, sounds like the same setup you have?
The suck through SU system was a bit of a pig to get started from cold, needed lots of choke, as the fuel would just puddle in the bottom of the turbo compressor. Also needed a carbon face seal on the compressor bearing, as fuel was going through compressor. The turbo was too big and laggy, I think we changed the exhaust housing to a 0.5 and that spooled it up much faster.You can't run an intercooler on a suck through system either. I used to run up to 18lbs on the Escort, was very low compression as it had a 3mm decomp plate and two head gaskets, but went quite well when on boost. Very thirsty though!!
How about just using the exhaust manifold and turbo, and blow through a weber carb, with a plenum on top to pressurise the float chamber? I think thats's how Turbo Technics used to do it. EFI would easily be the ultimate setup, but obviously cost more to build.
Thats the basic set up i have by the look of it, i'm missing the turbo to inlet manifold piping but that would be easy to make up. Can you remember how the turbo oil feed and return was set up on your RS2000? I was going to have a feed from the oil pressure sensor then return via a pipe welded into the sump?
To be honest I don't really need it to go on petrol at all as 99.9% of the time i'm on LPG and i could fit a 3rd small tank as a reserve so going gas only doesn't bother me.
I was just thinking of using a Sierra/ Granada EFI manifold to give throttle control - apparently bad things happen if you put boost through a normal carb even without fuel in it, although nobody is quite specific about what..I'm guessing at crushed floats and pressure coming out all over the body.
the oil pressure was just a "T" fitting at the sender unit, and the drain was back into the sump, just behined the alternator. They don't need a lot of oil flow, it pays to run a restrictor in teh fitting just where it enters the turbo, otherwise you lose too much oil pressure. You can put boost through a normal carb, but they need to be set up to handle it. Brass floats can collapse under high boost, the the float chamber needs to be pressurised too. At around 6-8 lbs boost you can usually get away with modifying a standard Weber carb. The other critical part is the ignition timing. Although LPG will allow you to run a lot more timing than you would be able to on petrol.
MOT time tomorrow. Drove up to Derbyshire on Sunday night after the Boxhill meet up, pleased to say I arrived 200 miles later still running on 4 cylinders. Welded the tail pipe up and refitted it for the test as I didn't have anything suitable to make up a side exit
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