Culebra

Hello

I have one Ecu Pettit, turbo stock to 12psi, exaust complete in 3" , and admission.

Wideband AEM.. My A/F ratio is 13...13,2 trotle 100%...!!

it is normal?

moconnor

iTrader: (14)

Your need to report AFRs at particular boost values; throttle position is not directly relevant.

At 12 psi on an FD you should be closer to 11:1 AFR; 13:1 is too lean.

David0ff

iTrader: (6)

it`s a bit hight ... have your injectors cleaned and flow tested .. also fuel filter ...
that is what i see ~ 15-16 psi with intake/exhaust/pettit ( exhaust has a high flow 300 cell cat and freeflow mufler )

also .. is your a/f probe mounted pre or post cat

Culebra

What will be the problem?

ecu pettit badly tuned??

My car is in spain.. ecu is tuned in EEUU.. It can be the problem?

Fuel pump,dying??

Culebra

Fuel filter new.

exhaust complet 3",, no cats.

David0ff

iTrader: (6)

theoretically speaking .. it is a somewhat risky a/f ratio to run a turbo car at .. especially a rotary .. i dotn think the ecu is tuned poorly ... very unlikely .. it`s just a programmed chip ( well 2 actually ) ...

if your octane is high enough ( use the highest easily available octane ) you should not have problems .. but .. just clean your injectors ..

and the only way to see if the fuel pump is on it`s last 100m ... you would need a fuel pressure gauge

mad_7tist

before condeming the injectors why not check to see if the fp speed relay is switching over to the full voltage at high loads, and see what the pressure is, look and see if the filter has been changed. borrowing a fp gague and running the electrical and pressure tests are a hell of a lot faster/easier than the injectors, also more likely. how old is your gague?

djseven

iTrader: (56)

You are simply running out of injector at around 13psi on the stock injectors.

David0ff

iTrader: (6)

yes that is also something overlooked ... mayb a relay problem ..

Culebra

Use 98 octane.
Gauge AF is new!!


and tested the stock ecu... same problem

Ecu pettit is tuned in the EEUU.. Conditions in Spain and others (atmospheric pressure).. is problem??

where the relay?

fuel pressure is possible....

David0ff

iTrader: (6)

dont evertest stock ecu at that boost level ...
no atmospheric pressure is not what is causing your problems ...
the relay is in the ciruit box .. next to the shock tower ...

Culebra

Pufffff !!
**** spain!! mechanics are not aware of RX7

is precious, I do not want to sell...

I AS .. http://club-rx7.foroactivo.com/prese...chics-t698.htm

Culebra

which is the pressure ramp?

I have always 37psi.. ay load does not increase when

is normal?? ...

Mahjik

iTrader: (1)

Should be 1:1 with boost.

Culebra

I do not understand.


gasoline pressure ramp.. ay has to increase when pressure turbo?

I always have 37psi.. does not increase

moconnor

iTrader: (14)

It should increase with boost. Is your fuel pressure regulator hooked up properly?

Culebra

pressure regulator connection ok

KO pump?

turbo to 10 psi. that fuel pressure should I have?

moconnor

iTrader: (14)

Every 1 psi of boost should add 1 psi to fuel pressure.

Culebra

OK.. 37psi atmospheric....... boost 10psi = 47psi fuel pressure. (stock pressure regulator)

Correct??

David0ff

iTrader: (6)

correct , should be like that

Culebra

Jaja.. my car only increases 1 psi of fuel pressure !!!

Culebra

Fuel pump new,, the problem persists..
voltage pump is 8,5V slowly ,,and 12V fast..

A/F 13...13,3 to 6000rpm boost 12psi..

t-von

iTrader: (8)

^ You need to do diag on all the systems that relate to the FPR. The lack of fuel pressure increase is why your running leaner. Download the FSM from with-in the site here and follow the proceedures.