fiestaturbo.com

[KEVFRST]

can someone tell me which is better and why? which is easier to tune etc etc.

[Phil Si]

the WTF is the Wide Turbo Force, basically allows a bigger amount of air i the engine and this chip can fuel it properly

[MarkFRST]

OFAB is better apparently, as it allows a different map sensor to be used if i rememeber right, you will have OFAC as you have a K plate.

[snake]

was gonna post earlier but couldn`t be arsed.. OFAB allows u to run a 3 bar map sensor, which allows u 2 run 2 bar boost. OFAC allows u to run a 2 bar map sensor, which only allows u to run 1 bar boost, weird but it makes sense to me, lol 1 bar map sensors are used for naturally asperated cars..

[snake]

other differences aswell i think but thats the only relevant one, don`t think u can just plug an ofac into a ofab, their are differences in the wirin loom, but can be modded as far as i know.

[nthorpey]

OFAB and OFAC use different types of MAP sensor, 23psi (1.5 bar) can be run using OFAC, this uses a very accurate frequency type sensor so is able to control engine particulars a lot more from the MAP sensor reading. AS above the OFAB can be mapped to use a 3 bar MAP sensor which will allow up to approx 30 psi (2 bar) boost pressure to be run. There are however ways around each problem


OFAC does also have a slightly different engine loom,

HTH

[snake]

close, lol

[KEVFRST]

cheers fellas, dont think ill ever need a 3bar map sensor, i aint a power hungry freak like most

[MOONDUST FRST]

Im swapping to OFAB

[Quantum John]

Nick/Snake/Any other knowledgeable chaps (and chapesses of course).

I took my car to my local rolling road and tuners recently to find out why it seemed like my overboost was cutting in 0.4 bar. This was all the more strange as the amal valve was disconnected. After plugging in the diagnostic gizmo it turns out I have a map sensor fault.

Before I rush out and buy a new standard map sensor from Ford at £109 retail , is there any others I can use to run more boost. I have OFAC.

A mate did send me the wiring diragrams and notes he made for swaping to OFAB but it is a lot of hassle not to mention expensive.

Cheers for any info,

John

[MadcatCraig]

u need a chip to run more boost the over boost protection is set at 10 psi .7 bar or thereabouts even when chipped u have to disconnect the standard amal valve

who would want to run that much boost into a cvh i dont know mine has enuf problems with 7psi

[iceman]

Apparently there's a way to over ride the problem u have John. Either buy a boost regulator n by pass the amal valve....thus givin u higher boost pressure if I'm not wrong. But doing so might harm ur engine. 2nd choice is to source for a 2nd hand map sensor n try it. BTW, I was runnin 12psi n havin no problem

[nthorpey]

Quantum john, I would recommend you borrow a known good MAP sensor from someone and try this to see if it cures the problem, if not I'm sure you'll be able to get one for less than £109 or I may even be able to get a little discount from Ford

[snake]

ford ecus are known for cuttin the boost as low as 4 psi:S, for some reason they are all diff, some are fine to 10psi lol, i would try and borrow a map sensor first, personally i don`t run the amal valve, and for settin the car actuator up i would use a straight pipe from the manifold to the actuator, blankin the turbo outlet off, and set the boost up this way( i run superchip delimiter/195+unichip at present.. This code readers aint exactly good, and i`ve also known em to give random fault codes out..

[stu@mdevelopments]

Good to see youve been taking an interest Mr Thorpe

The OFAC system is slightly better than OFAB.

The amal valve does NOT need to be removed when the car is chipped. (Not for a decent chip anyway) Use an uprated actuator and do the job properly.

Do NOT susbstitute an OFAC frequency map sensor for any other type or you are going to destroy the engine in a BIG way

Chips for EEv IV do not just remove the boost limit, they also refine the fuel and timing and recalibrate the ACT retard maps to take care of the increased temperatures we expect to generate.

Finally, a 2 bar map sensor only runs 1 bar of boost because no matter what type of engine we use there will always be vaccuum. Measured from atmosphere 1 bar to negative 1 bar. 0 on your boost gauge is actually 1 bar of pressure. 1 bar on your boost gauge is actually 2 bar of pressure.

This is due to barometric air pressure of the earth being 1 bar. which to you boost gauge junkies is actually 0psi

Does this make sense?

Best regards,
Stu

[nthorpey]

Stu, how do you manage to write all these replies on the forums and still get work done to earn some money Always very helpful advide from Stu, he truly is the don!

This guy seriously knows his stuff

[HappyHippy]

Quantum John i can get a lucas equivalent if thats any good for much cheaper than £109.

not back at work until a saturdy though (weeks holiday ) but let me know if its defo a EEV4 your after

[Excursion]

'1' bar as you call it is actually 0 on the boost gauge, or atmospheric pressure. A 2 bar map sensor can measure 2 bar of pressure, but this is not all positive pressure - this is the dynamic range of the sensor and usually split down the middle so +1 bar of boost and the equilvalent of -1 bar of pressure. 3 bar is +1.5 and -1.5.

[Quantum John]

Thanks for all the advise people, especially Stu.
Balls, why are all the tuners that really take an interest in us and help people out with free advice a million miles away?
(I know it's only approx 400 but it might as well be a million)

I am currently running a bleed valve set to 10psi, amal valve disconnected and a purpose burned superchip. The car was going back for the third adjustment of the chip to slightly increase the fueling above 5000 rpm.

As suggested I don't supppose anyone has got a known good OFAC map sensor that I could borrow to see it that cures the problem? If it does I know to buy a new one.

John

[stu@mdevelopments]

_____________________________________________________________
Posted by Excursion:
3 bar is +1.5 and -1.5.
_____________________________________________________________

Automotive 3 bar map sensors measure -1bar and +2bar.

Best Regards,
Stu

[Excursion]

ahh yeah, my bad.

John the ofac sensor may be the same as the ones on all ford cars - do a check at a ford garage then get one froma scrapyard