Outer Limits 4x4 Board

Seen these advertised on Ebay UK- http://cgi.ebay.com.au/ws/eBayISAPI.dll ... RK:MEWA:IT

I know what it is(its a malpassi or similare rising rate fuel reg) but they claim it will improve both drivability and economy. Has anyone ever tried one and had any success with them? The price is pretty good i beleive concidering it comes with the adapter to bolt it straight on to the 3.9 fuel rail.

From the picture it is a Malpassi rising rate regulator, we sell these they are usually only recommended for boosted applications. The only way i could see it improving driveability & economy etc. on a standard rover would be if you had a lean condition caused by an injector problem or air mass meter problem. It would be better to get this fixed instead of fitting a regulator, any car that has one fitted should be dyno tuned.

http://www.injectacarb.com.au/fuel-pres ... e362231112

Hope this helps,

Brad

i would have a search on some of the UK rover forums as RPi is pretty well known when it comes to Rover V8's.... they are hardly a company to sell "snake oil"

I had a look at these a while ago.
I have a 3.9 with a unichip so the mixture can be tailored.
I recall however that the full throttle fuel curve on mine was down around 12:1 and had to be backed off on the dyno to 12.5.
So the 3.9 in Australia ( mine anyway) is rich on full throttle . You could just worsen the problem.
Remember that the UK spec from 91??/or 92 onward had cats. They run them leaner to get their stoichometric 14.7 :1 for probably up to about 70% throttle, so for them it would probably give better throttle response.

Nobody that I know of in Oz recommends them, but I love that little adaptor.
Its a pretty rough way to try to fool injection .
regards Philip A

Philip A wrote:Oz recommends them, but I love that little adaptor.
Its a pretty rough way to try to fool injection .
regards Philip A

Don't you mean RUFF way of fooling the injection

I am trying to see if there is much in the way of pressure difference between the rover regulator and a commodore one just though from a cheap replacement perspective

Tom

I am pretty sure they are the same pressure.Usually 2.5 bar over the manifold vacuum. I suspect that they are interchangeable.
I did a bit of research when I was looking at putting a higher pressure regulator on my Thor manifold and use the Thor injectors which are rated at 3.5 bar but have the regulator in the tank.
There is a VW golf, I think the VR6 which has a higher bar regulator and I think the rail fittings are the same.
Auto speed has a recent article which gives the Bosch part number for a higher pressure regulator.
regard sPhilip A

As someone said, all you're doing is fooling the ECU into over-fuelling above a certain engine load. You can trick it any number of ways for less - adding a resistance to or across the air or coolant temperature sensor will make it enrichen the mixture, that's how those "magic" cheap "tuning boxes" work.

My vote, stop trying to fool a crap ECU and fit a proper one...