SafeChav

Ive got an ECU for my Escort RS Turbo, bought it off eBay, and its not the usual Eeprom type chip, its a circuit board which has 3 wires and solders to 3 points on the main ECU board.

Anyone know if these things are (being extremely blunt) SHIT?

I thought the whole point of the Eeprom chips was to raise the boost limiter, and give the additional timing information for boosting over the factory limit.

Just a little worried this thing is going to allow me to boost like a mad man but not have the correct timing settings or anything and make my 3.5k re-built engine a piece of scrap

Anyone got any info?

sailorbob

I'll be the first to admit I know nothing about the Bosch ecu on your car but what you have described sounds like the old 'fool the ecu' sensor resistance trick. My advice would be don't fit it.

Any chance of posting a photo and a copy of the fitting instructions?

SafeChav

hey there

no its not a resistor type trick, theres IC's and various other components on the board.

Im fairly sure it just bypasses the boost limit on the ecu.

I'll sort a picture out tomorrow, i bought the ecu complete with the chip installed, so no instructions, but the bloke i bought it off claims he was using it to run 32psi on an all steel engine. He also said its capable of running unlimited boost. He did also have many other performance RST parts for sale aswell so i was happy with what i was getting and i was aware it had this type of chip.

Just want to be sure before i change the ECU.

HORNETS7

its sounds like it has a higher boost limiter on it not a chipped ecu as u say ! very crude way of doing it !

solongs uve got means of seeing what boost u have on a boost guage it won't matter be carefull and adjust the boost i little at a time !

the rst engine takes the fuelling that it needs with the increased boost so u have no worries there!

SafeChav

i thought it was fairly common knowledge that ERST's can only safely fuel to 14psi before you have to start taking steps to give extra fueling?

HORNETS7

no a escort rs turbo increases its own fuelling to match the boost !

it works as a vacuum the more boost u run the more fuel it will put in!
the fuel system is already pressurised enoguh to cope

SafeChav

is that so

So effectively you are saying i can turn the boost up to whatever i like and as far as fuelling is concerned the management escort turbos have will cope with fuelling.

Obviously i know im limited by the weakest link in the chain (mine being a standard engine )

sailorbob

I thought you had to do stuff like add a fifth injector if you wanted to wind the boost up on the ERST

SafeChav

sailorbob:

yeah me too

HORNETS7

yes to a degree mine was pushing 20 psi with no mods to the fuelling or 5th injector but it all depends on the stage of your tuning !

ie bigger intercooler lowcomp engine etc...

i was running stage 2 turbo
pace chargecooler
piper 285t2 cam
k&n
came out at 213 bhp

Billabong

Dangerous advice imo, and incorrect.

The RST's system can cope to a point -, but even with a chip and 14psi, something is usually done to the fuelling

Suprised you got to 20psi without any fuelling mod's, did the RR operator give you fuelling info - i.e. was it running lean at all, and was this 20psi a spike, or held?

HORNETS7

it was running and holding 20 psi all day and has done for 2 years ! no fuelling mods at all!

the same r/r operator also told me the mfi system has more fuel pressure than the efi system!


so whats the fuelling mod u do to increase the fuel then?
without a 5th injector?

S1 Lee

the rst mfi fuel system needs to be re-calibrated if the boost is raised by any amount. being a mechanical system it will not self adjust.

by raising the boost of a car and not re calibrating the fuel system you run a dangerous risk of detonation due to lean fueling.

ask any competent rst tuner, they will all tell you the same.

DazC

iTrader: (1)

Bill is correct.

The MFI system may have a higher BASE system fuel pressure but it only runs the same control pressure of an EFI system. This is because the fuel pressure regulator is controlled by vacuum/pressure on a EFI car and not on the MFI cars.

Any alteration in air flow will require fueling modifications.

a1dale

I have just bought exactly what you have described safechav. Do. Know weather to sell it or give it a go I will be gettin the car setup with it but just wondered if you had any luck with it?