Hi ive recently bought a 2003 Ford Focus St170. It needs a couple of little jobs done to it then may look at modifying it a bit. Was wondering how easy they are to get descent power gains out of? It currently has a Induction Kit on it and thats about it.

Im not looking to spend a fortune but wasnt sure if you could get any descent gains out of the car with a de-cat pipe, aftermarket exhaust system, Ecu chip and any other bits and pieces?

Thanks

 

I spent nearly £2500 on bolt on parts for my ST170 and that does not include fitting, off the top of my head

£850 Clutch and fly wheel
£250 Blue Finn
£400 Dreamscience
£150 K&N Typoon
£100 CFM quickshift
£90 Exhaust Cam Vernier retarded
£350 Mongoose Cat back exhaust
£120 Underdrive Pulleys
Ported Throttle Body


And from all the above the best i got was 189bhp.
The engines are already tuned, so not very tunable, your filter may have even lost you power. Unless you want to spend £3000+ on a supercharger kit or £4000 upwards on a turbo charger conversion i really would not bother.

 

Get a bluefinn and a piper cross viper forced induction kit.

 

Hi thanks for the replies, I did look into the blue fin's but not everyone thought they were that good. I think its a Pipercross thats on it, I will have to check.

Did think they might be expensive to tune and dont want to take it too far since its my daily drive for my girlfriend and child this now. A turbo conversion will probably be on the cars once I get my Mk5 Zetec Turbo conversion finished.... finally lol.

I might just keep an eye out for a decat and a exhaust this now and maybe a Strut brace to 2 and just keep it to a few basic mods for the time being.

 

No need for a front strut brace on a focus, it will give you nothing.
And if your going to have your girlfriend and child in the car please do not decat it, it will be VERY loud and raspy. Blue Finn is pants so dont waste your money. If there was one modification that i would definately do, above all else it would be the lightened fly wheel, woke the car up a treat and improves your 0-60 time above anything else. Get your car on the RR as it is, i think you will be suprised how many of the 168 horses it actually has...................... allot less usually.
Main thing is the ST170 is a rubbish daily, in standard trim they return an average 25mpg, tuned this gets allot worse, mine was averaging 18-20mpg

 

Guy in Wales is getting 193bhp from the standard ST170 in a kit car. Locked off inlet valve, exhaust cam retarded 6 deg, and an mbe ecu mapped to run the vvt correctly not just off like some do.

 

An ST170 with after market ECU and amended cam timing is not what i would call standard, far from it

 

Big deal, so I forgot to put "standard st170 engine"

 

Whats a locked off inlet valve? Is that something to do with the EGR system?

 

No. It's the variable inlet locked in one position.
Once the vvt was sorted to correctly alter the cam timing. 51 deg advance was found to be the max needed, unlike ford running it to 60 degs (for emissions)
The inlet only needed to be in one position. Don't know if it was the long or short.

So for about £800 on ecu and cam wheel you can get 193 bhp. They have not got the max out of it yet.