spudboytim

iTrader: (3)

Hi guys, in need of some advice/help on getting to the bottom of why my car prouduced less than expected power on a recent mapping session.

303bhp
1.2 bar boost tailing of to 0.9.
MAXED OUT 440 INJECTORS!!!

The car is a 96 type ra,

yellow 440 injectors (flow/matched tested),
prolab adjustable fuel pressure reg (tested)
td05 16g with 90degree entry,
front mount,
gp spec headers & uppipe,
gems ecu,
group n sraight through rally exhaust,
hks air filter,
maf less,
lightened flywheel,
lightweight pulley set.
3 port boost selenoid.

The mapper said the injectors maxed out at 303BHP and the boost tailed off quite quickly.

I was hoping with my mods to run about 320-330bhp ish.

Could it be the turbo that was restricting things with that 90 degree entry? Has anyone had experience of this with same turbo?

I would like to be able to pin point the problem so i could put it right.

Any ideas or advice much appreciated.

stevebt

iTrader: (8)

If your injectors are maxed out theres your problem. Fit an adjustable fuel pressure reg or get new injectors either way it will need mapped.

alcazar

iTrader: (2)

Get some 550cc or even 650cc injectors.
Mine runs 740's on a 2.5 conversion, HS TD05 20g.

spudboytim

iTrader: (3)

Cheers for the reply bud, ive got a prolab adjustable fpr which is all

checked and working fine, also my injectors have only just gone back in

after been sent away for flow matching/testing/cleaning.

Has anybody had the same problem of 440's maxing out at 300bhp??

Cheers tim.

RICHARD J

iTrader: (4)

Flow marching testing cleaning is pointless if they are too small.

KAS35RSTI

iTrader: (73)

Who mapped it

spudboytim

iTrader: (3)

Its a fair pint bud, but i was led to believe that a good set of 440's would

produce up to 330ish with a good adjustable fpr. This advice came from

tuners, mappers etc, so was just wondering why mine maxed out at

303bhp??

StiX

iTrader: (4)

But they are not too small though for 330bhp?

I had 325bhp on my UK Turbo with 440s/VF35 standard TMIC.

StiX

iTrader: (4)

They definitely 440s?

From Andy Fs website:

'Most 93-98 cars have 380cc injectors which at standard pressure are rated at up to 300 bhp. Later STI and 99/00 UK cars have 440cc injectors which can run to 350 bhp assuming adequate fuel pressure. '

?

prodriverules

iTrader: (52)

I ran 440's up to 347bhp a while back with fuel pressure set to 3bar with the vac pipe off and they where only at 91% duty so I find it hard to believe they are maxed at 303 on yours mate.

addi monster

iTrader: (6)

my 440's are making 352bhp combined with a fpr

stevebt

iTrader: (8)

I'm sure running a fmic and a td05 is a definate 550cc injectors as a minimum?

Hammer man

iTrader: (25)

Just putting numbers to the side for a second,,, how does the car feel/drive now, or is your mind set on numbers??

spudboytim

iTrader: (3)

Hi guys, thanks for all the replys. The injectors are defo 440's (yellows) as

i changed them for the original 380's (greys).

Had the 440's tested/matched/cleaned etc b4 fitting,

Got a prolab adjustable fpr all checked and working,

also a roger clarke (340) fuel pump brand new.

So cant really understand why the injectors gave up

so early.

spudboytim

iTrader: (3)

I havnt picked the car up yet, its still with the mapper but he also said he

was quite suprised how the injectors maxed out at 303bhp.

I'm sure it will feel great but was just a bit worried why they maxed out so

early when most people seem to be having results of 330-350bhp with the

same set up.

Tidgy

somit strange with the fueling by the looks of it, mine hit 340 before even worrying the injectors with standard fpr on a vf34.

mickywrx

iTrader: (29)

Mine did 330bhp on standard 380cc injectors and standard fuel pressure.

KAS35RSTI

iTrader: (73)

Was it mapped by Popeye the sailor man by any chance

EngineMapper @ Group B Motorsport

That says cam timing or such like is wrong. Boost tailing off quickly and inefficient burning of the fuel says something mechanical in your setup is leading to the inefficiency. I'd check the cam timing and do a leak down test on the motor to be sure.

Graham

stevebt

iTrader: (8)

I'm probably thinking about the td05/06

spudboytim

iTrader: (3)

Cheers for the reply graham, would the mapper of been able to notice if the cam timing was out??

360ste

iTrader: (1)

When was the fuel filter last changed? Where I work I have seen generators not give full output because the Fuel filter is crapped up or has started to colapse thus restricting fuel. New filter fitted and good to go. Just a thought.

spudboytim

iTrader: (3)

Thanks for the reply, ive got a brand new fuel filter so its not that.

alcazar

iTrader: (2)

You haven't said who your mapper is/was?

Is it someone from the garage near you?
Or someone who knows what he is doing?

Terminator X

iTrader: (7)

20hp out, could just be the dyno ... try another

TX.

spudboytim

iTrader: (3)

Mapper is one of the best in the country and is a expert in gems/simtek!! Im sure if you know your scoobies you can work it out. The issue lies with MY CAR and NOT his mapping!! So dont want to attach his name to this thread. Im sure you understand.

shag

iTrader: (10)

as said before mate you have got a mechanical issue there, check you compressions.

joz8968

iTrader: (13)

"Prolab" FPR? Never heard of that brand(?) (Fuelab, yes).

Is it a cheapo eBay jobbie at 20-30 quid? If so, I expect that could be the problem. Try reusing the OEM one and getting it RR'd and/or another remap. The OEM one will be fine (so long as the membrane isn't worn/knackered/torn, etc., due to age).

Wolf_gsxr

THIS
Don't know about the boost side but I've found when taking N/A cars for mapping if the timing is out even slightly it seriously hinders the power curve at higher rpm's.

spudboytim

iTrader: (3)

My mistake, its a fuelab fpr and not a prolab!! Well spotted!!

If my timing was out guys would the mapper pick this up, with some sort of reading with his lap top??

Thanks again guys for the input.