Injectors

[STU666V]

Hi,

Is there anyone running 560CC injectors and what BHP are you running? What would be the max bhp from 560cc injectors.

Will be looking for around 400bhp.

 

[shroom]

http://www.gtiroc.com/forums/showthread.php?24188-FAQ-Fueling-Injector-Sizes-and-BHP-limits

all info here

 

[shroom]

so bit more than 360bhp by the looks of things or if you have a fpr then maybe more? im no expert just going off the info on that page

 

[GTI-R Nath]

i get a message saying i do not have permission to access this page wen i click on link ???

 

[STU666V]

http://www.gtiroc.com/forums/showthread.php?24188-FAQ-Fueling-Injector-Sizes-and-BHP-limits

all info here

Cheers


FAQ - Fueling - Injector Sizes and BHP limits

Remember that the stock fuel pressur regulator will raise fuel pressure in a 1:1 ratio with the boost. For every psi of boost above ambient pressure the FPR will add 1 psi of fuel pressure.

If you are running 14psi of boost, your fuel pressure at WOT (wide open throttle) will be 43.5 + 14psi = 57.5psi. This is why you should not raise your base WOT fuel pressure above 4 bar. @ 4bar base fuel pressure and 14psi you will be running 58psi + 14psi = 72psi of fuel pressure @ WOT. This is why its important to find the right sized injector. I garuntee any stock rubber hose will be a bit stressed at this pressure and your fuel pump will be hard pressed to keep that pressure. Also your injectors may stick because the valve cant over come that high a fuel pressure.

444cc @ 3bar @ 85% @ 0.5BSFC = 287bhp
444cc @ 3bar @ 100% @ 0.5BSFC = 338bhp

555cc @ 3bar @ 85% @ 0.5BSFC = 359bhp
555cc @ 3bar @ 100% @ 0.5BSFC = 422bhp

600cc @ 3bar @ 85% @ 0.5BSFC = 388bhp
600cc @ 3bar @ 100% @ 0.5BSFC = 457bhp

700cc @ 3bar @ 85% @ 0.5BSFC = 453bhp
700cc @ 3bar @ 100% @ 0.5BSFC = 533bhp

1000cc @ 3bar @ 85% @ 0.5BSFC = 647bhp
1000cc @ 3bar @ 100% @ 0.5BSFC = 761bhp

DO NOT RAISE BASE WOT FUEL PRESSURE PAST 4BAR

444cc @ 4bar (513cc) @ 85% @ 0.5BSFC = 332bhp
444cc @ 4bar (513cc) @ 100% @ 0.5BSFC = 390bhp

555cc @ 4bar (642cc) @ 85% @ 0.5BSFC = 415bhp
555cc @ 4bar (642cc) @ 100% @ 0.5BSFC = 489bhp

600cc @ 4bar (694cc) @ 85% @ 0.5BSFC = 449bhp
600cc @ 4bar (694cc) @ 100% @ 0.5BSFC = 528bhp

700cc @ 4bar (810cc) @ 85% @ 0.5BSFC = 524bhp
700cc @ 4bar (810cc) @ 100% @ 0.5BSFC = 617bhp

1000cc @ 4bar (1157cc) @ 85% @ 0.5BSFC = 749bhp
1000cc @ 4bar (1157cc) @ 100% @ 0.5BSFC = 881bhp​

 

[markwashington]

If you want 400bhp you'll need 700cc injectors, speak to fusion Ed and he'll give you advice.

 

[shroom]

have you got the 560cc already? as said prob easier with your target of 400 with 700cc, I have 700 in mine or had not sure of anyone selling any not sure if bob may still ahve some

 

[johnsy]

am i reading this right,

444cc @ 4bar (513cc) @ 100% @ 0.5BSFC = 390bhp

does this mean standard injectors will handle say 360-370 bhp @ 4 bar WOT, 90% ISH

Or have i totallt missed the point

 

[red reading]

they will do that if your fuel pump can supply the flow at that pressure and other faults don't occur ,remeber your fuel pressure goes up on a 1 to 1 basis with the boost.

 

[johnsy]

is 360-370 achievable @ 1 bar boost, obviously not on a standard tubby,

my next venture i think is going to be mid to high 300's,im just trying to undersand the science behind it all, and what is required

 

[Makaveli_se7en]

The problem with 360-370bhp at 1 bar is that any of the turbo's that will achieve it are so far out of they're optimimum operating range at 1 bar its not worth using them. You're would just be building in lag for the sake it of it. Better to use a more suitabley sized turbo with a bit more boost.

 

[johnsy]

which turbo would be best suited then? and at roughly what boost

 

[STU666V]

have you got the 560cc already? as said prob easier with your target of 400 with 700cc, I have 700 in mine or had not sure of anyone selling any not sure if bob may still ahve some

I have the standard injectors in at the moment and made 330-340bhp but i have 560cc injectors spare in my garage.
Will PM Bob

Cheers

 

[markwashington]

The secret is not to max out your injectors but to buy bigger injectors so they don't have to operate at such high pressure. Standard injectors running 350bhp plus are a disaster waiting to happen. It's not worth the risk for the sake of £200.

A GT2871 will make high 300's at about 1.5 bar I think. My turbo which is the ND super hybrid or something made 376bhp at 1.4 bar, on a standard FPR with 600cc injectors. I've since bought 700's which will go on in the new year, and I'm hoping for about 400bhp at 1.5 bar. I think a GT3071 will make 400bhp at about 1.2 bar although I'm sure those who have one fillted will correct me if I'm wrong.

Obviously these figures are all dependand on the other mods you have as a bigger turbo and injectors don't guarantee higher power and better performance, the best money I've ever spent on my car was getting it properly mapped by someone who knows what they're doing. The performance was so drastically changed for the better and I got some really good advice in with the bundle. BTW have you changed the turbo elbow? if not that should be your first port of call.

 

[red reading]

3071 do 400ish at 1.4-1.5 bar so very similar to your turbo really, my md196 does 410+ at 1.35bar.

 

[John]

A 2871 will do 400bhp. My 2871 achieved 388bhp @ 1.6bar, however thats with a stock elbow and downpipe so with a 3 inch upgrade I dont see why 400bhp isnt achieveable at that boost.

A 3071 will do 400bhp easy and would probably manage it at around 1.2bar, however if 400bhp is your goal and you dont want more power I personally dont see the point in the bigger, laggier turbo.

 

[STU666V]

I have a 2871 turbo sitting here, it all depends on what type of 2871 you have as some only do around 350bhp and some do 400bhp, should have a nice new elbow going on too

Cheers for the info lads.

 

[markwashington]

I believe the GT2871R makes 400bhp. You'll have to check the one you've got but I'd go elbow first and you'll be surprised at the difference. (that sounds like some crazy fetish sex advice).

 

[dencon]

I have a 2871 turbo sitting here, it all depends on what type of 2871 you have as some only do around 350bhp and some do 400bhp, should have a nice new elbow going on too

Cheers for the info lads.

Stu. Where are all these nice new elbows

 

[Braveheart]

Stu.... may car made 350bhp at 1.1bar on a gt2871 with 3" compressor inlet at 0.86AR + 3" am performance elbow and downpipe onto 2.5" goose tail pipe.
I have blitz 660cc injectors that were at 68% duty cycle. I was told the car could make 400+ bhp but the Z32 maf voltage would max without a bit of fooling via EMU.
You may be able to reach 400bhp with your 560cc injectors coupled with 2871 and 3" elbow but it will cost you £100+ getting it mapped to find out and a re-visit to get re-mapped again if you decided to fit larger injectors. 560cc injectors should be well sought after for somebody increasing boost on standard turbo.