Outer Limits 4x4 Board

Would replacing the stock fuel injectors with higher flow units have any effect?

well, it would provide more fuel to your engine

do you have a need for more fuel?
unless the car has lots of other engine mods you'll probably just end up running rich...

You would need to have the fuel pump adjusted as well, as they control the amount of fuel delivery.

Gonzo wrote:well, it would provide more fuel to your engine

do you have a need for more fuel?
unless the car has lots of other engine mods you'll probably just end up running rich...

I had seen some where that the stock injectors were a little under-rated with the flow. By going to a higher flow rate some extra power at higher revs could be found (or so said the writer for motor which just happens to be the same as mine).

This was just a couple of lines from somewhere and I'm just trying to sus it out. Surely I can get more out of a 2.6lt than 92hp???

You're highly likely to lose power if you just go to a larger flowing injector and change nothing else; plus your fuel economy will suck. That's a very dodgy way of increasing fuel flow on an EFI engine. You'd be better off getting an adjustable fuel pressure regulator and getting it set up on a dyno with the air / fuel ratio checked at the same time.

How's the ignition timing controlled on your engine? Can you play around with it yourself- eg. have you got a traditional distributor?

Have you got extractors and a free flowing exhaust? Changed your air intake too?

To get max effect of a fuel injector up grade you would need as said a higher flowing fuel pump, but thats fine to do but to take full advantage of this up grade a next size up cam wouldnt go a-stray

If you're not happy with your cars performance bec of fuel flow etc

quit beatin around the bush and stop tryin to cut shortcuts with your car.

this is your car we're talkin about here.

Go and see an EFI shop and get your car tuned with the new injectors

bigger injectors, and fuel pump etc etc from the EFI shop should do the trick

I recommend SAS ( Silverwater Automotive Service )

TOM

Higher pressure regulator required to up rail pressure at higher rpms

bazzle wrote:Higher pressure regulator required to up rail pressure at higher rpms

Exactly what I said. There's no need to go getting new injectors or a new fuel pump unless there is a huge difference in what you need- which wouldn't be the case given you don't appear to have added a turbo or anything radical.

Getting the EFI program redone would be great, but good luck finding anyone who specialises on that engine. Some places will sell you a chip and all they've done is tweak a few settings for the timing maps on a PC- pot luck and no dyno time involved at all.

Go the fuel pressure regulator if you want to do it, and get it set up on a dyno with the mixtures checked.

murcod wrote:

bazzle wrote:Higher pressure regulator required to up rail pressure at higher rpms

Exactly what I said. There's no need to go getting new injectors or a new fuel pump unless there is a huge difference in what you need- which wouldn't be the case given you don't appear to have added a turbo or anything radical.

Getting the EFI program redone would be great, but good luck finding anyone who specialises on that engine. Some places will sell you a chip and all they've done is tweak a few settings for the timing maps on a PC- pot luck and no dyno time involved at all.

Go the fuel pressure regulator if you want to do it, and get it set up on a dyno with the mixtures checked.

Most Japanese engines are setup to use 87 octane fuel. The way the replacement chips work is to recalibrate the ignition advance curve to suit our 91 octane fuel. Usually gives about 10% gain in torque/power. Your Mitsubishi based 2.6 should be an easy fix. Try www.powerchipgroup.com

I worked for a couple of years at an aftermarket EFI place that did chips and EFI conversions. 10% gain would be great; but the reality is the gains vary drastically with each different engine. Some cars gain very little if any. Also most chip just tweak the igntion maps- Nev reckons it's a mixture problem.

Depending on his engine's EFI set up he may be able to tweak the reference "base" ignition setting himself and then everything else will be advanced by the same amount.

BTW you can also get whatever gain you want from an engine and have a dyno printout to prove it ....