Timo.K

Yes, standard cams.

XR2

And I bet your ECU won't support VCT?

IIRC standard Zetec cams will fit the ST170 head, for you power figures I'd go at least for some fast road ones.

Timo.K

The ECU does support VVT, although only 'switching' it at 1800 rpm, rather than infinitely variable as per Ford's ECU. For forest rallying, that's fine for me.
I thought the Zetec cams had smaller journals? Although I've never seen the two heads side by side to compare.
I'm looking at best options to increase CR, head worked and cams...which ones and from where I've no idea...open to suggestions.

The Underdog

im not an expert but from what iv read you will never get good power with the vvt coming in on a shift light setup, which sounds like what you have. lots of people do this and wate their time. your better off sticking to a bog standard engine. for ecu has a very complex way of working the vvt, its not On and Off. get it setup with a managment that can control it and you will see 195 to 200 on a standard engine max i think.

the man to speak to is will pedley racing.

R-A-J

what exhaust are you running and which model itb's are you running as the diameter will have an effect. Depending on this with good mapping you should be around the 200 mark so something is a miss somewhere. Do you have any power graphs with afr readings?

Timo.K

For smooth road use that's very true, a switched VVT is a bit on the industrial side but for forest rallying it's been fine and the power curve on the rolling road was good..if not peaking a little lower than expected. As the inlet cam is fully advanced at peak revs, regardless of operation, it wouldn't make any difference to peak bhp..although may affect mid range torque slightly.
I'm interested in finding definitive information on ST head and cam mods which are proven to work..what bottom end mods need doing etc. The fueling and ignition I can find a happy compromise using my current set up later.

Timo.K

Hi Raj,
I'm running a fairly simple set up with minimal inputs..Crank, tps, temps, only. No afm or air temp. sensors.
The length is approx 125mm, from trumpet to head, around 38mm chokes which should be about right. ST170 injectors which flow well up to 250bhp. Exhaust is a 4-2-1 with matched length primaries into a straight through 2 1/4" system with single rear free flowing box.
I've got the dyno readout but it's not really relevant as I want to upgrade the engine components anyway.

The Underdog

contact will pedley i would. but a switched vvt has never made good power in any car iv researched. iv looked all over the web as i wanted to do it to mine and they all end up the same as yours. i know will pedley has the ecu and the knowledge to get the power you want.

R-A-J

Hi Timo,

that's very similar to a spec crazycage and rick have done off here, they got around 200bhp, that was using megasquirt and some good mapping. Defo worth pm'ing either of them off here for their input. Thengine in question went like stink in a focus, now it lives in a fiesta mk2 shell

Timo.K

Am I better off ditching the ST /VVT and going with a 2.0 Blacktop with cams?

R-A-J

Best to speak to the person who is doing the mapping regarding ecu (should you wish to change) I would use VVT delete kit, the st170 is a much better base than a normal black top. The head is totally different especially in the inlet port size. I have had crazycage do some mild porting on my head and he said the inlets are fine as they are for my application.

There was a thread posted on here a while back with a link with someone who used a st170 head on a silvertop short motor I think, cams and a change in cr coupled with some other mods gave over 240bhp i think. It was an interesting thread.

Anyway dont want to hyjack daveboys thread might be worth starting a fresh thread as I know there would be a lot of input and interest in it

robrs2

Delete kit is the thing for the ST170. Done a mates and it far better now.

M K

iTrader: (9)

Any progress with this Dave?

will@greenlight

this is possibly the most impressive build thread ive ever seen on any fiesta

Timo.K

I've spoken to quite a few people so far and STILL not sure on what's best. Do I go for forged rods and piston kit to raise compression or skim the head/ deck the block and use standard ST170 bottom end? Which cams are best and with what engine mods for best torque giving circa 225 - 240 bhp?
Anyone actually done one who can give any definitive, reliable info?

Also, having done a little more research, the standard VVT seems to retard the inlet cam at higher revs so the 'switched' method may not be any good for ultimate bhp at higher revs, although the more important mid range torque seems ok..

The Underdog

if you start a new post in general discussion i think that will be best because this is someones build thread specific for their car and its getting clogged up with other discussions.
id like to know more info so get one posted up.

Davey8oy

Little update here's few pics

New pedal box





Steering wheel wireless control



My central switch panel



New custom ap racing alloy belled discs and 4pot caliper



Oh And a set of road wheel

PaulinhoT

Brilliant, all looking good

gus

iTrader: (1)

Put them in the living room Dave.

smitsturbo

stunning

XRT_si

iTrader: (2)

Awesome, this is going to be something really special.

Shudder to think what it all cost though!

Glenn_

iTrader: (1)

Fook me ive seen them wheels and ive got a hard on.

fatmat25

i do believe this car is porn what colour you going for!!!!!

xr2john

That's an awesome build m8. Can't wait to see the finished results

little bram

Any updates

sridgett

Nice car mate. Gotta love a mk1 fiesta. Keep the pics coming.

LIFE'S SHORT SO FLOOR IT.

IanC

Any updates on this yet? Special little car this

Davey8oy

Been really really busy with work but had few parts made for the mk1

Brakes






Oh and I've sold my 6 speed straight cut dog box and gone full sequential

bav

What an awesome build! Love it.

Miller 3

iTrader: (4)

Where did you get those brakes bud? And what size are they?

Davey8oy

reyland motorsport did all the brakes mate

XRT_si

iTrader: (2)

Good on you for doing the sequential, I know it's (very) expensive, but it will transform the way the car drives.

M K

iTrader: (9)

Push push gears = AWESOME

marky_g

Wow this is amazing!

dough_man

This is awesome! Never seen so much power from an st 170.

Where did you get the belt tensioner from? The standard ones are crap.


Thanks

Davey8oy

Just a little update

Bought a ramp for my workshop to play with the mk1s instead of rolling around on the floor





Had a trip up to elite after I was a tad pi€%ed off with the waiting time for my box to go from 8 weeks to 3 month then to 6 months! So I collected my deposit and took a trip to quaife on the way home and picked this up

















Also had a play with my Supersport over last couple of days fitted my coilovers and had the Ashley exhaust modded to fit closer to the body for more ground clearance





And got some more Carla cloth for the Supersport and the race car

XRT_si

iTrader: (2)

Very nice, what is the Quaife rated to?

M K

iTrader: (9)

All that money and the box ain't even built up lol what a cheek

Davey8oy

Cheers mk lol

And the box is rated to 300 bhp

They have sold 30 kits so far to people using them for rally and circuit racing!

dug112y

iTrader: (1)

What price is the quaife and does it use std driveshafts or bolted flange shafts?