Was reading through the latest Fast Ford mag last night and noticed in the Ford Stats they have printed that the standard power figure's between the 2WD & 4WD are really different!

Think it said the 2WD had 204bhp from factory, and the 4WD had 220bhp from factory! Why is there such a difference from what I thought would be the same engines used?

Sorry if this has been asked before! lol

 

They are more or less the same engines.BUT i think ford left the 4wd with more power as the 4wd system takes a lot of power from the flywheel figure to the at the wheel figure.If you understand that.

 

not forgetting the 4x4's have cats which reduce the power, hence needing to up the power.

 

the power figures quoted are correct, dont forget the 4x4 engine is made of 80% revised parts or some thing like that anyway. And as Stretch says the reason was to compensate for the transmission loss.

 

NOT ALL 4x4's have Cat's mate.Only the later green top engines.

 

ahh

 

power quoted is not bhp but is in ps, so works out slighty less.

 

different intake manifold

 

No! And not many green tops still have them!!!

 

I ain't got a CAT on my 4x4

 

Revised Head as well, Bigger Intercooler, Modified Pistons, Ignition Map changes and not to mention the 4x4 Turbo....

 

Cool cheers guys!

 

that is a misconseption moden cats do not reduce power on a standed engine,
both cat and non cat cossie 4x4 are rated at 220bhp and the escos is rated at 227bhp with a cat, only when you need big bhp gains is it needed to remove the cat, but having said that le mans type sports cars have to use cats and the produce 500bhp+

 

yes but not to forget if you bin the cat on a catted car you instantly have a freer reving motor and also more power

 

So if you take the Cat off of a newer 4wd then you will have even more power than an older 2wd!?

 

4x4 is more powerful than the 2wd any way by 16 bhp

 

taking the cat off would give u more power in any case no matter how efficient it is, the le mans maybe 500bhp take the cat off could be alot more

 

so we all agree then cats should be kicked out of the door any way, at least until your MOT is due i dont condone breaking the law any way

 

really? i would like to know how that works on a std cosworth ecu that is MAP based.

removing any restriction gives you the potential for more power, but if all that you do is remove the restriction and improve the VE but don't add any extra fuel (which you don't with the MAP based ecu as it does not measure airflow, only guess it), you may even lose power (due to moving to the lean side of a maximum power AFR).

 

the 4wd needs the xtra bhp for the added weight of the 4wd transmission as well

 

to remove the cat is not breaking the law unless after removed your car exceds exhaust emitions

 

99.9% of car i have tested for mot that have had the cat removed fail the emmission test, if you get pulled up on a road side check and it fails, the mot you have got is no longer valid and the ministry make you get anouther mot.

 

4x4 cossie uses slightly more boost than 2wd cossies.

 

For the record, 4x4's come with the thicker walled , RS500 spec block (aka 200 block) a revised head, different cam profiles and a specially developed exhaust manifold. The turbo, although a T3, was also reworked and has different internals to the 2wd version and this allows the 4x4 to spool up quicker with less lag. 4x4's dont require turbo dampers and the loom is a two piece item. The ecu in a 4x4 is an L8 which can hold twice the information that a 2wd L6 unit is capable of holding. The intercooler is larger than the 2wd version and the 4x4 uses a different gearbox to the 2wd borg warner unit. 4X4's also come fitted with dark blue injectors as opposed to the 2wd's yellows. Early 4x4's were redtops with no catalyst fitted and later ones are greentops with catalysts, also 4x4's have strengthened inner wings, all other sierras, including the 2wd's, do not
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i thought the green top was available from 1990 when the 4x4 came out.

 

Well there you go, you learn something knew every day, Catalysts were only fitted to saf 4x4's from 1992 on, so G, H and J plate 4x4's come with redtop non-cat cossie engines whilst some late J's, K and L reg 4x4's are fitted with the catalyst, lambda sensored, greentop cossie engine. Mine is a J plate and has one of the last pre-cat redtop's


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