Wull79

Hi guys i have just tuned my cossie up to stage3 t34 greens etc and am wondering what the fuel pressure should be? Also any ideas on the afr? putting a wide band lambda sensor on it on saturday to check it so if any of u guys have a ballpark figure that would help cheers paul

Wull79

Anyone?

JTECH James

iTrader: (13)

ask whoever wrote the software pal.

Raj_FRST

i have no idea about mapping but im pretty sure as long as the afr stays ar about 13.5-13.9 then you should be about there, I may be wrong though, if it starts heading towards 14+ then its leaning off too much

im just getting to grips with my v4 software, if you don have a self standalone mappable ecu I would knock the boost down and bring it gradually constantly checking it, once its stable get it to a mapper.

im sure this doenst help you.lol :-( soz

JTECH James

iTrader: (13)

theres a meltdown on the cards

Raj_FRST

lol, thats why im not gonna do my, went to corten miller today to pick up my race block, spent half an hours on them whilst they were mapping a car, there is soooo much involved, fuel maps, ign maps, cranking bollox, etc etc best left to the proffessionals

had to laugh at the det cans though, who would of thought sothing so simple could save an engine

Raj_FRST

i think the perfect afr is 14.7 not what i said 13.7, it is late and I was totally confused by all the parameters the mapper was trying to explain.lol

JTECH James

iTrader: (13)

it becomes the norm after a while pal

with a cheapo wideband id aim to cruise around 14.7:1, and under full boost aim for mid 11s

but the fuel pressure question can only be answered by whoever wrote the software, unless its ours, then i can answer lol

JTECH James

iTrader: (13)

perfect for cruise, see that sort of afr on boost and kiss your engine goodbye

svony

iTrader: (3)

OMG!!! Please don't touch anything until a qualified tuner looks at it...

Fuel pressure should be determined by who wrote the chip, from my experience with MSD standard (3.5 bar vacuum pipe disconnected).

AFR should 12.2 - 12.7... Anything in the 13's is a meltdown waiting to happen on a boosted car.

Good luck

Raj_FRST

ahh right, he was setting each scale in the fuel map as he increased the revs slightly whilst holding the same speed so I pressume this was the cruise??? he did mention that if it was on a turbo car there would be so much more work involved,

my comments just go to show you should leave it to the proffessionals!!!lol

I really fancy getting a n/a (cheap) car and learning the basics of mapping as its really interesting.

so what is the best afr for safe performance as there are 2 options on this thread, mid 11's or mid 12's?

would that make a lot of difference in performance?

JTECH James

iTrader: (13)

imo, 12s on a cossie with a cheapo wideband are quite risky, id personnally stick to mid 11s and be safe

Raj_FRST

just been trawling through some other performance forums, mainly jap stuff and for a turbo car running on pump fuel the safe norm seems to be mid 11's and on high octane race fuel mid 12's so i think the guys on here are bang on the money

Wull79

Thanks for the info guys, james yes it is a msd chip, for a t34 with a .48 housing 803s 3bar on standard compression

JTECH James

iTrader: (13)

std pressure then pal, 3.5 bar at idle with the vac pipe off and blocked.

Wull79

Thanks for that james