Rb20det + New Injectors = Car Wont Start

[RB-ONEVIA]

HEY GUY THIS IS THE PROBLEM I HAVE, I HAVE A RB20DET ONEVIA I JUST HAD A NEW SET OF DENSO 550CC INJECTORS PUT IN AND MY ECU REMAPED TO SUIT BUT NOW ITS TRYING TO START BUT JUST WONT TURN OVER FOR SOME REASON . IVE CHECKED FUSES, WIRING, FUEL PUMP, FUEL REG, ANYTHINGS ELSE I SHOULD BE LOOKING FOR?

ANY IDEAS PLEASE

[MBS206]

The engine won't crank?

[RB-ONEVIA]

ITS CRANKING OVER IT JUST WONT START

[BHDave]

pull the spark plugs out and make sure you haven't got a leaky injector causing it to hydro lock

edit. thought you said it wouldn't crank? still worth looking at the plugs for fouling

Edited November 7, 2006 by BHDave

[RB-ONEVIA]

THE INJECTORS SHOULDNT BE LEAKING THEY ARE BRAND NEW

[MBS206]

The tune hasn't been adjusted for starting.

$20 says it needs adjusting to start. The fuel map may have been altered, but the problem you are having is the cranking pulsewidth.

What was your old injector size, and what's the new injector size?

Edited November 7, 2006 by MBS206

[RB-ONEVIA]

old ones were 270cc new are 550cc

[MBS206]

Adjust your tune, for start up pulsewidth only, take the MS injector pulsewidth and multiply it by 0.49

This is the new number you should now enter.

If this doesn't start the car, revert to old number (Write the old number down)

I don't know what ECU you're running, so I can't even attempt to offer you some advice on how to alter it.

[RB-ONEVIA]

its just a standard hitachi ecu remaped

[raz0r$harP.UK]

Has it been remapped for the injectors?

If not, it needs to be.

[RB-ONEVIA]

yeah the map suits the new injectors

[MBS206]

If it isn't remapped properly, for the injection pulsewidth at start up, it won't start.

Throw the old injectors in, and see if it starts up. DO NOT drive it like this, as it'll be VERY lean.

[SXR]

-have you got all the o-rings on the injectors

-check if your getting fuel pressure

[Cubes]

Please turn your caps lock off.

Have you had the stock injectors flowed to know they are 270cc? You will find they are actually 260cc's.

Has injector lag correction also been applied?

Check for vacuum leaks, ensure the carbon canister has been hooked up as that can produce quite a nasty vac leak.

A decent vac leak will cause it to run lean, be very difficult to start and once started it will stall.

[RB-ONEVIA]

they are getting fuel pressure that was the first thing i checked,

the k value and injector lag time were both set to suit the denso injectors

also had a look for vac leak but everything looks to be ok

[Cubes]

You haven't accidentally put the fuel lines around the wrong way?

[RB-ONEVIA]

vvv

Edited November 7, 2006 by RB-ONEVIA

[RB-ONEVIA]

followed all the lines and they are all connected up right, im stating to think it has something to do with this remap possible

[TurboX]

- OK stupid question, but are the injectors the right impedance to suit the ECU??

[RB-ONEVIA]

they have the same impedance