Injectors Upgrades

[Iain-gti 6]

I have heard about people changing the injectors to bigger ones in the 1.9 gti engine but i dont know what injectors are being used anyone know? also is it just injectors or is it other fuel system parts?

i have searched couldn't find anything if ive been blind link me

 

Thanks Iain

[Paul_13 212 1 Cars]

I'm pretty sure the gti6 injectors are a higher cc than 1.9's.

Could be wrong

 

 

 

 

*******Quick search using link in my sig gives this site.

 

Search injector flow rates

Edited May 15, 2010 by Paul_13

[Iain-gti 6]

how do i find out watch injectors they are?? the Bosch number?? in google or something? 0-280-150-363 are the biggest on the page?

[Paul_13 212 1 Cars]

Thing is you have to take into consideration what the engine can handle/use with existing management...

[Iain-gti 6]

well i was thinking of fitting 405 mi16 injectors or gti6 ones? are these suitable by any chance? thanks Iain

[Paul_13 212 1 Cars]

All answers can be found with a bit of self help

Edited May 15, 2010 by Paul_13

[Iain-gti 6]

Thank you

[Miles 331 1 Cars]

What is the engine spec?, The std one's can handle 200bhp

[welshpug 1,661]

in short, without mappable engine management it's not possible, also a tad pointless without any engine modifications.

 

you need to get more air in there before you throw more fuel at it, as in uprated camshafts, higher flowing exhausts, raised compression ratios, ITB's.

 

IIRC the injectors are capable of up to about 160-170 odd as standard, Mi16 are very close in size as well, so not much of an upgrade

 

edit, underestimated their capability as shown by Miles

Edited May 15, 2010 by welshpug

[petert 588]

1.9L Mi16 and 1.9L 8V injectors are identical, theoretically capable of 180-185hp at 85% duty cycle & 3 Bar.

Edited May 15, 2010 by petert

[DrSarty 90 1 Cars]

1.9L Mi16 and 1.9L 8V injectors are identical, theoretically capable of 180-185hp at 85% duty cycle & 3 Bar.

 

So the answer is simply 'no' I'm afraid. You cannot just fit 'higher flowing' injectors into an otherwise unmodified engine and expect or actually get any gain whatsoever.

 

Imagine me giving you a pen, which can theoretically flow 50% more ink than the normal one you use. In practice it won't make any difference, because YOU can only write so fast. It's pointless. Your brain, arm and muscles can only work at a certain rate, unless you do something serious to improve them.

 

And just to prove this - and going back to 1.9GTI / Mi16 Bosch yellow injectors and PeterT's comment - my tandem engine build project (in my signature) is 16valve engines, using new management, an aftermarket cam, aftermarket exhaust, higher compression ratio and new (GTI6) inlet, and may only just be getting close to being enough to push these yellow injectors to their sensible, theoretical limit.

 

In short don't bother, unless you do LOTS of other stuff too.

[Alan_M 66 1 Cars]

Worth getting the standard injectors cleaned though, someone on here offers the service.

[DrSarty 90 1 Cars]

Worth getting the standard injectors cleaned though, someone on here offers the service.

 

Mad Professor (Mark). Excellent service.

[zebedy101 0]

Surely bigger injectors will do nothing on standard management. The ecu will still be telling it to put the same amount of fuel in so it will be no different too how it was?

[Ryan 99]

The ECU tells the injectors how long to stay open for. Bigger injectors will put in more fuel in the time.

[TheLarneMan 4]

I've a set of Weber Marelli Pico 440cc/min injectors in my Mi16 (controlled by Emerald management).

[petert 588]

440cc/min

 

I'm surprised you can control it with an Emerald at idle!!!

[sideways danny 0]

I've a set of Weber Marelli Pico 440cc/min injectors in my Mi16 (controlled by Emerald management).

 

 

AWEFUL injectors, no atomisation at all, pencil jet spray pattern. I bet you could have 20-30% better fuel economy with better injectors. Siemens Deka 480cc injectors as fitted to the renault megane 225 are fantastic and are same fitment as pico

[TheLarneMan 4]

AWEFUL injectors, no atomisation at all, pencil jet spray pattern. I bet you could have 20-30% better fuel economy with better injectors. Siemens Deka 480cc injectors as fitted to the renault megane 225 are fantastic and are same fitment as pico

 

I've had no issues at all in the four years I've had them. Idles well, revs well and fuel consumption is perfectly acceptable.

 

Maybe you had a bad set.

[P_Monty 2]

The ECU tells the injectors how long to stay open for. Bigger injectors will put in more fuel in the time.

Shirley without more air flowing in, that's just going to make it run more rich?

[Baz 421]

Shirley without more air flowing in, that's just going to make it run more rich?

 

Exactly, and that was Ryan's point, so pointless.

 

Who's Shirley though?

[Daviewonder 533 3 Cars]

Shirley without more air flowing in, that's just going to make it run more rich?

 

 

 

 

 

[P_Monty 2]

LOL - I got a bit carried away. What I meant to say was that given (as someone said up there^^^) a fixed amount of air and an unmodified ecu all that will happen is that the car will run rich and the performance will be *worse* as a result.