VEMS and Ford light green injectors roughly at idle

[th.b.w.]

Hy,

i have since 4weeks an VEMS, got it running to 90%

I drive first the RS2 injectors, but at full boost they run over 100% duty at 1.9bar.
Now i changed to the Ford light green ...588, 440ccm , but the idle is very roughly, not so smooth as with the RS2 ones. At topend they run at 80%, looks o.k. to me.

Is there an other injector option for an smooth idle and better topend performance ?
Or can i change the settings in Vems ?

....the next step is an stroker 2,5l in 1/2 - 1 jear....

Thanks

Thomas

[GazzaG60]

did you change the req fuel when fitting them or just slap um in.

[Jamo]

Have you changed req_fuel?

You'd be better to head over to www.vems.co.uk and look at the injector modelling posts.

Depending on your firmware it maybe down to voltage compensation etc. I found the same and emailed RC for the injector deadtime settings. Since using these values it has been better

[th.b.w.]

Hy,

no i didn't change the req_fuel, i changed the VE table to this injectors...

Yesterday i changed the fuel regulator from 4,2 to now 3bar, not realy better yet...

@ Jamo, did you use the light green injectors too ?


Thomas

[A80Avant]

you first need to change the reg_fuel, then VE table.

[Jamo]

Hy,

no i didn't change the req_fuel, i changed the VE table to this injectors...

Yesterday i changed the fuel regulator from 4,2 to now 3bar, not realy better yet...

@ Jamo, did you use the light green injectors too ?


Thomas

No i've got RC Injectors

You need to change the req_fuel I would say because your values hasn't been changed your pulsewidth is too high at idle.

Have you logged your idle and looked at the values in comparison to what it was with the old injectors?

[GazzaG60]

req_fuel is how long the injector opens to achieve 14.7:1 a bigger injector takes less time to give that much fuel so req_fuel needs to be lower.

The VE of the engine hasn't changed so no changes should be needed however you may find slight changes are needed.

fords should have the same settings as the audi. same maker.

[th.b.w.]

Hy,

req_fuel setting are 4.2...., the VE table goes from 67 at idle to max.145 at full boost.
Pulsewith at idle is 1.8-1.9ms...


Thomas

[A80Avant]

i run 440cc injectors with 3.8bar fpr with no problems whatsoever

[th.b.w.]

Hy,

@A80Avant, do you run these light green injectors ?

Thomas

[A80Avant]

yes, that is what i said. my req_fuel is set to 6.

I have no problems, although im looking into something insteresting... I do get for some reason on the logs the injector DC to go well over the 100% (it has gone to 117% once) even though the amount of fuel injected is less than what it was in the past.

For example, in the past, when tuning, i had even up to 0.70 lamda after 5500rpm.I never had problems
Now i have taken that to 0.78 lamda but the injector DC seems to be going over 100% after 5800 or 6000rpm for some reason. I dont understand why.

[th.b.w.]

I will change the Req_fuel later and see what happens...

Thomas

[Rocco]

and wich are your turbo specs Thomas??

RS2 turbo +7A regulator....etc etc?? with Vems of course

ABY or 3B??

good luck from an other Tomas

[Jamo]

440 cc at 3 bar = 508 cc at 4 bar

req_fuel = 6.49 * 9 ( 2226 / 5 / 508 ) = 5.7 multiply by .75 = 4.2 or 4.3 rounded

So your req_fuel is actually correct.

What firmware are you running?

[GazzaG60]

ive seen duty over 100% too. not sure if it calculates duty or measures it.

personally id load the known working map back in and change the req_fuel to mathc the change in injector size. sounds like the ve table has gone all out. or you have timing issues.

also if you have bogged it down with fuel you may need to clean the plugs to get it running nice again. otherwise it will just chug.

get a small brush and some brake cleaner and scrub un clean.