Outer Limits 4x4 Board

I have a gu patrol with 4500 petrol motor. With 2.5'' exhaust and extractors. I have herd from some one that i can increase my performance by taking out the original injectors and replacing them with r32 skyline injectors as they have more cc capacity? Is this true ? Do i need to replace the injection rail as well ? Is there any other budget power up grades?

Cheers Jono

This is rubbish. If the injector size differs from stock then the fuel mixture will be off, the factory ecu does not know that the injectors are bigger and it will feed the same duty cycle and be very rich. You fit larger injectors when you make mechanical changes to the engine that mean it makes motre power than the stock injector can supply. You want to fit a chip/tune the ecu to optimize what you have.

Joel

Thanks mate for your help so the injectors will only work if i get a power chip as well so i can tune it to suit?

No.

upgraded Injectors are only good if you need MORE fuel than your factory ones can supply. Your factory ones will not be maxed out with the modifications you have.

What Joel is suggesting is a tuneable chip/computer to allow you to optimise the tune of your current set up.

Cheers
Stew

what they say is correct. Your current injectors are not reaching 100% duty cycle anyway so you certainly dont need bigger ones. A decent after market ecu/loom/tune will set you back 2K plus dyno time for very little gain. If you go this route youd atleast want higher comp and suitable cam to get your monies worth.
Totaly not worthwhile in my opinion. There are no cheap options unfortunately, your free flowing exhaust is probly the best value power up you can get.

Diff ratio change will help and make it better offroad. A good service and dyno tune to get tune to suit exhaust system.

Cris

Sweet guys thanks for your help i think i will do what cris says and get a dyno tune to suit the exhaust and down the track look into gears. What ratio diff gears do i need to make 35s feel like the standard tyres again?

if you want powerup, search for thread by raptorthumper.

Try replacing the fuel filter, you might be amazed at the difference this can make.

what exactly are you dyno tuning, Its running factory management??? the wildest thing you could do is screw in a bit more base timing and that can be done in your driveway.
Dont get talked into wasting money.

You can optimize timing for premium on the dyno as the distributor is still adjustable. This can realise some improvement but you will have to continue to use premium. Greater benefits come from fitting a chip, we have a wire in type that allows fuel and ignition timing changes and duel mapping so you can at the flick of a switch go back to low octane fuel.

Joel