rrfpr fuel pressure?

sx_turbo

sx_turbo

Lifer
GTti said:
Does anyone actually know what the stanard AFR roughly is on WOT? You're aiming to keep this or less to keep temeratures down.

The simple solution is to run enough fuel pressure to ensure that on WOT a safe AFR is reached. This downside is running needlessly rich through in most other scenarios, it's crude but you certainly don't need a rolling road!

Buy a wideband and set it up yourself, I would suggest you're aiming for around 11:1. Other people will have a better idea of what this value should be (I'd hope)
Click to expand...

yeah but it would be safer to get a pro to do it surely. i certainly wouldnt attempt to set it up myself, whether i have a wideband or not.
 
GTti

GTti

Member +
Yes, all you need is a safe place to put your foot down in each gear. A tuner with experience may think 12.5:1 is acceptable for a forced induction engine. My GTti wouldn't last long at 12:5:1, it's designed to run significantly rich as stock to keep the temps down.

It's exactly the question that should have been asked and not "How much pressure do I run?"

Other peoples setup's shouldn't be copied for alot of reasons!
 
ragz

ragz

Member +
av u ever heard ov a tuner from the states called ben strader in the u.s he teaches at uni's on how to map ecu's n occasionaly comes to the uk to teach aswell i got couple books by him on how to map ecu's
some text from his book

air/fuel mixtures and characteristics

6.0 rich burn limit(fully warm engine)
9.0 black smoke/low power
11.5 approximate rich best torque at wide open throttle
12.2 safe best power at wide open throttle
13.3 approximate lean best torque
14.6 stoichiometric AFR(chemically ideal at idle)
15.5 lean cruise
16.5 usual best economy
18.0 carbureted lean burn limit
22+ EEC/EFI lean burn limit

hope it helps
 
Gilly2006

Gilly2006

Member +
ragz said:
av u ever heard ov a tuner from the states called ben strader in the u.s he teaches at uni's on how to map ecu's n occasionaly comes to the uk to teach aswell i got couple books by him on how to map ecu's
some text from his book

air/fuel mixtures and characteristics

6.0 rich burn limit(fully warm engine)
9.0 black smoke/low power
11.5 approximate rich best torque at wide open throttle
12.2 safe best power at wide open throttle
13.3 approximate lean best torque
14.6 stoichiometric AFR(chemically ideal at idle)
15.5 lean cruise
16.5 usual best economy
18.0 carbureted lean burn limit
22+ EEC/EFI lean burn limit

hope it helps
Click to expand...

so out of all of those ratios, what would be the best to use? 11.5 or 12.2?
 
goldenvtr

goldenvtr

Member +
id say between 12.2 and 11.5, im probly going to do mine around 11.7/8 when i get my new setup on.

Dont forget youll be running higher compression so your temps might be diffrent, if i was you and your home tunning it i would run it a bit richer that that
 
goldenvtr

goldenvtr

Member +
To add, i have no idea what my a/f ratio is at the moment as i setmine up on EGT's last time before my guage broke :mad:
 
Monkfish

Monkfish

Member +
ragz said:
av u ever heard ov a tuner from the states called ben strader in the u.s he teaches at uni's on how to map ecu's n occasionaly comes to the uk to teach aswell i got couple books by him on how to map ecu's
some text from his book

air/fuel mixtures and characteristics

6.0 rich burn limit(fully warm engine)
9.0 black smoke/low power
11.5 approximate rich best torque at wide open throttle
12.2 safe best power at wide open throttle
13.3 approximate lean best torque
14.6 stoichiometric AFR(chemically ideal at idle)
15.5 lean cruise
16.5 usual best economy
18.0 carbureted lean burn limit
22+ EEC/EFI lean burn limit

hope it helps
Click to expand...

Interesting, I've always thought that when a turbo car is belching out black smoke, it's running a bit rich but it's about right. Interesting, mine was smoking a fair amount on the rolling road. Not excessively, but it's enough that I could either lean the mixture off or advance the timing a little for some better power/torque.

At least I think that's the case :homer:
 
sx_turbo

sx_turbo

Lifer
Monkfish said:
Interesting, I've always thought that when a turbo car is belching out black smoke, it's running a bit rich but it's about right. Interesting, mine was smoking a fair amount on the rolling road. Not excessively, but it's enough that I could either lean the mixture off or advance the timing a little for some better power/torque.

At least I think that's the case :homer:
Click to expand...

thats prob because yours is only setup with an rrfpr and there fore over fuelling in the lower revs, and running just about right in the higher revs, i dont get no smoke now that mine is setup.:gt-smilie:
 
Gilly2006

Gilly2006

Member +
goldenvtr said:
id say between 12.2 and 11.5, im probly going to do mine around 11.7/8 when i get my new setup on.

Dont forget youll be running higher compression so your temps might be diffrent, if i was you and your home tunning it i would run it a bit richer that that
Click to expand...
so 12.4/12.5 would be ok? and also what is the key when trying to get this fiqure across the rev range, should it read this from 2k to 6500k?
 
sx_turbo

sx_turbo

Lifer
benGT said:
are you running an SAFC then sx_turbo and not an rrfpr?
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both, i fitted the fpr to late and the damage was already done to my car, the tuner left it set at 3.5bar to lessen the injector duty cycle so as not to work the injectors hard.
 
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