750ccm injectors for URS4

[K7ERG]

Wanted as above or a place i can get them.

Thanks in advance

[urquattro-island]

here

034motorsport

[topsparky]

is n't tom (audiman) selling up rated injectors can't remember the flow rate
though

[Audi_CQ]

If this is the engine you're going to use the GT3071 on, 750 is way to large and will only get you a bad idle if using the org. motronic and a 4bar FPR.
If org. motronic go for the orange "porsche" injectors instead. Think they are about 510cc and good for ~500hp.

Just my 0.02$

[topsparky]

found the thread they're 630 cc
linky

[terrybullwon]

found the thread they're 630 cc
linky

Yeah i have got a set, very good service on tom behalf and a very good product and price to 10/10

[K7ERG]

So the 630ccm will be ok with the GT3071R???

Not to big

[Audi_CQ]

So the 630ccm will be ok with the GT3071R???

Not to big

I'm using the 630's on my 2.5 and a friend has them on his 2.2. They work fine, but has to run 12.5 -13 AFR at idle to get even running. My friend used them first with a 3bar FPR and then his engine run fine at idle with 14.7 AFR, but with a 4bar FPR he had to set AFR to 12.5-13 at idle.

The orange "porsche" injectors is more then enough for a 3071 and would be better then the 630's

Cheers,
Roger

[K7ERG]

Cheers for that mate

[K7ERG]

No need got what i need.

[Jamo]

erm it's all in the mapping guys! I'm sure the 630 or 750 can be mapped by MRC to idle at 14.7:1 AFR

They did with my Porsche Orange tops no problem.

[Audi_CQ]

erm it's all in the mapping guys! I'm sure the 630 or 750 can be mapped by MRC to idle at 14.7:1 AFR

They did with my Porsche Orange tops no problem.

No it's not in the mapping, but in the injector and injector driver. High ohm injectors are a bit slow and need a bit of time to open. If opening time is to short it doesn't fully open and spray pattern becomes bad and you get droplets. Only way to map it out is to retard timing so much that you have to open the throttle a bit more and use longer injector time. AFR get to 14.7, but you use more fuel. Not a good idea

Porsche Orange tops are no problem. That's way I recommend them

[Jamo]

No it's not in the mapping, but in the injector and injector driver. High ohm injectors are a bit slow and need a bit of time to open. If opening time is to short it doesn't fully open and spray pattern becomes bad and you get droplets. Only way to map it out is to retard timing so much that you have to open the throttle a bit more and use longer injector time. AFR get to 14.7, but you use more fuel. Not a good idea

Porsche Orange tops are no problem. That's way I recommend them

IMO thats down to poor injector choice.

[Audi_CQ]

IMO thats down to poor injector choice.

What would your choice be?

[Jamo]

What would your choice be?

I would speak to the tuner mapping the car and find out what they recommend.

Mihnea has posted on here he had big injectros I think they were 650cc running at 14.7 at a 840 rpm idle.

http://www.s2forum.com/forum/showthread.php?t=9887