imprezapm

How much boost is it safe to run on a 1994 standard UK engine?
I've fitted a Dawes Device & am currently running 1 bar because anything higher cuts the fuel. I'm fitting a Dawes AFR & fuel cut out raiser tomorrow which should allow more boost but I don't want to find out the hard way how much she'll take.

jonny gav

iTrader: (1)

wouldn't go over 1.2 bar mate,what type of fuel cut defender do you have???

imprezapm

Cheers, 1.2 bar sounds OK & more to the point, safe, as I've seen all sorts of boosts talked about here without knowing what else they've done to the engine.
Mmmm... what's a fuel cut defender??
The cut out raiser (if that's the same thing) is a Dawes that I got with the Dawes SDBCRV 0.5mm boost controller as I was warned that I'd probably have this (fuel cut out) problem on my car.

imprezapm

Looks good then. Hopefully the Dawes cut out raiser will then allow me to get up to around 1.2 bar.
ECU DIY remapping sounds too scary for me. I'll leave that to the experts.

Bob Rawle

Make sure you fueling is ok at the same time, the earlier ecu's were not extensively ott on fueling like the later ones.

Bob

imprezapm

How do I check this?
I've got an AFR guage to check on mixture, or is fuel supply the the problem there needing an uprated pump?

Scott.T

iTrader: (2)

AFR gauge will give you a good indication.
Run it up the road as near standard boost and monitor the AFR.
Then up is and make sure the AFR reading are of similar values.

Scott.T

iTrader: (2)

On a standard 94UK car fuel cut will occur at approx 14.87psi (just over 1BAR). But Boost needs to be held at this level for a couple of seconds in order for 'Fuel Cut' to kick in.

If you peak at this then drop back to 13.5(ish), things should be O.K.

A DIY Fuel cut defender can be built for about £12, which I used to run with actuator adjustments at 15.5psi.

This has been removed and 15.5psi is now being achieved using my DIY ECU Re-map.

[Edited by Scott.T - 8/11/2002 9:29:40 PM]