500 BHP on 4 greys,T4 etc?????????
proven answers and NOT pub talk 
07-12-2004, 06:02 PM
#4
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I doubt it 99.99% .... 
If it DOES have 500 bhp on 4 greys, then the fuel pressure needs to be
turned up alot. BUT it will be so rich off boost it would smoke !!!!
Even then, the HIGH pressure diffential across the injectors will eventually
destroy/degrade the injectors internal moving parts !!!
If it DOES have 500 bhp on 4 greys, then the fuel pressure needs to be
turned up alot. BUT it will be so rich off boost it would smoke !!!!
Even then, the HIGH pressure diffential across the injectors will eventually
destroy/degrade the injectors internal moving parts !!!
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07-12-2004, 06:10 PM
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Originally Posted by SECS
I doubt it 99.99% ....
If it DOES have 500 bhp on 4 greys, then the fuel pressure needs to be
turned up alot. BUT it will be so rich off boost it would smoke !!!!
Even then, the HIGH pressure diffential across the injectors will eventually
destroy/degrade the injectors internal moving parts !!!
If it DOES have 500 bhp on 4 greys, then the fuel pressure needs to be
turned up alot. BUT it will be so rich off boost it would smoke !!!!
Even then, the HIGH pressure diffential across the injectors will eventually
destroy/degrade the injectors internal moving parts !!!
pressure is turned up but this has disadvantages.
It is more likely that the rolling road where measurements are taken
are inaccurate and 20-30 bhp can be a difference depending
on conditions (air temperature/tyre pressure/atmospherice pressure etc)
07-12-2004, 06:11 PM
#14
Norris Motorsport
I know this is really going to upset so many people but it is possible.
I little while ago I went up to Nobles rollers and managed 520bhp on 4 greys on my own car.
This required a base fuel pressure of 4.5bar as opposed to 3.5bar and of course the rest of my fuel system is'nt standard.
I remapped the car for this increase in fuel pressure off boost and ended up with a perfect fuel map for greys capable of 500+ runnign a 4.5 bar base pressure.
Now whilst this may not be the normal thing to do I honestly wanted to see if it was achievable and it was.
I obviously don't advise doing this on a totally std fuel system, or without an 044 pump as on boost at 2 bar you will need 6.5 bar pressure which in order to flow enough fuel at that pressure will require at least one, preferably 2 044 pumps.
To be quite honest its easier to simply swap to 1000cc units and have the car mapped properly, but there is proof it is possible!!!
I little while ago I went up to Nobles rollers and managed 520bhp on 4 greys on my own car.
This required a base fuel pressure of 4.5bar as opposed to 3.5bar and of course the rest of my fuel system is'nt standard.
I remapped the car for this increase in fuel pressure off boost and ended up with a perfect fuel map for greys capable of 500+ runnign a 4.5 bar base pressure.
Now whilst this may not be the normal thing to do I honestly wanted to see if it was achievable and it was.
I obviously don't advise doing this on a totally std fuel system, or without an 044 pump as on boost at 2 bar you will need 6.5 bar pressure which in order to flow enough fuel at that pressure will require at least one, preferably 2 044 pumps.
To be quite honest its easier to simply swap to 1000cc units and have the car mapped properly, but there is proof it is possible!!!
07-12-2004, 06:20 PM
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cheers Karl for your answer and well I bet a few peeps will have to think b4 they speak(pub talk) 
thanks again 
reason I asked is I DONT want to go the 8 injectors rounte if I can help it
thanks again reason I asked is I DONT want to go the 8 injectors rounte if I can help it
07-12-2004, 06:22 PM
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Originally Posted by POPEYE
but like saying why run 320bhp though standard injectors,,cos it can
07-12-2004, 06:29 PM
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Well i got 480bhp on greys at paul hills
earlier this year at 28psi
and at Interpro 1 month later i had 476bhp
So i am happy
maybe the rollers are not 100% accurate but a lot of people quote figures from the same rollers on this board so i am happy to do the same..
12 months now and the Engine is fine
Standard Head bolts and a Cometic Head Gasket which i might add has been used before
earlier this year at 28psi
and at Interpro 1 month later i had 476bhp
So i am happy
maybe the rollers are not 100% accurate but a lot of people quote figures from the same rollers on this board so i am happy to do the same..
12 months now and the Engine is fine
Standard Head bolts and a Cometic Head Gasket which i might add has been used before
**
07-12-2004, 08:06 PM
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one of my cars runs 5.7 bar fuel pressure and four injectors and over 500 bhp
and thats 2 litre yb rs500 speced and built in 1988 so theres nothing new there!
and thats 2 litre yb rs500 speced and built in 1988 so theres nothing new there!
07-12-2004, 08:43 PM
#27
I know of 3 tuners who ran 5bar line pressure and an uprated pump with 403s at 95% duty cycle and around 510bhp over 10 yrs ago folks, so like Martin said, bugger all new there at all... still a shite idea though, even if its a very old shite idea
Fact is, modern injectors make this practice the worst option when we can do it with std or even lower fuel pressure nowadays by utilising larger injectors. Id suggest 750cc items on L8 or aftermarket management personally.
Fact is, modern injectors make this practice the worst option when we can do it with std or even lower fuel pressure nowadays by utilising larger injectors. Id suggest 750cc items on L8 or aftermarket management personally.
07-12-2004, 08:52 PM
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yer stu.
but i did not say they were greys!
how about four 800cc bosch injectors back in 88 on the old girl. and the other fuel rail/injectors not used/needed,
oh and a bigger fuel rail.
but i did not say they were greys!
how about four 800cc bosch injectors back in 88 on the old girl. and the other fuel rail/injectors not used/needed,
oh and a bigger fuel rail.
07-12-2004, 09:12 PM
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no fault stuf,
try bigger braided fuel lines with swurl pot and four fuel pumps all controled by the bosch motortronic 2.8 ecu.
i know its 5.7 bar as it has a dash display and when i check with eggenburger confurmed this is whot they run,
try bigger braided fuel lines with swurl pot and four fuel pumps all controled by the bosch motortronic 2.8 ecu.
i know its 5.7 bar as it has a dash display and when i check with eggenburger confurmed this is whot they run,
07-12-2004, 09:37 PM
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well looks like it!
they also used good old cable ties to hold the brake cooling ducts on!
still there only where the rear diff motor is and then they all go inside the car.
they also used good old cable ties to hold the brake cooling ducts on!
still there only where the rear diff motor is and then they all go inside the car.
