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Comment by Big Vern on August 14, 2016 at 15:56

@Paul Sheridan Silvertop Zetec 1.8 high output is 130hp, 1.8 medium output is 118hp stock. Different head and cams mainly, the HO has a version of the 2.0 head and 2.0 cams and was used in the MK5&6 Escort XR3i MO was used in other 1.8 zetec applications. The HO was dropped for Focus - the 1.8 black top was 122hpand 2.0 136hp

@Dave Adams 150hp from an unmodified 1.8HO would be a real challenge as you just can't get the airflow through the head. Also the rams horn manifold being used here only gets enough flow due to it being overly big rather than good. All the prod manifolds were designed the way they are for packaging reasons. A better exhaust man designed for the job would extract a few more hp at high revs but if you're not after ringing its neck then take the drivability that comes with the part you have. Mid range driveability in a 'chuckable' car will make the car very useable - should still give you sub 6 second 0-60 :-)

Comment by Steve Kerswell on August 14, 2016 at 10:59

Well thought out Paul, get out and enjoy, to many negative vibes on here lately. :-)))

Comment by Paul Sheridan on August 14, 2016 at 10:55

Interesting comments gentlemen thank you.

After explaining to the tuners, the aerodynamics of a Dutton Phaeton and the fact that they become rather unstable at higher speed, along with exactly what I will be using the car for. My instructions were, that I wanted the engine to produce a good balance between power and torque and to drive smoothly through out the rev range. 

Dave has basically said the same below, there is no point in squeezing as much top end power out of the engine as possible, and as James has said all I would have to do if I wanted more power, would be to fit larger injectors and a decent exhaust manifold.

BV, I would like to think it has been mapped correctly as I took it to one of the two Omex recommended tuners in my part of the country.  

After driving the car around for a couple of hours on Friday evening and visiting a country pub for a pint (of course)  I am more than happy with its performance, it has more than enough grunt to put a silly grin on your face, and sounds great.  Happy days.

 

Comment by James Doulton on August 14, 2016 at 9:59

(Interesting site Graham) I think that the 1.8 uses Bosch 0-280-155-819 which flow 176cc/min @ 43.5psi and the 2.0 uses 0-280-155-820 which flows 192cc/min at the same pressure.

Comment by Graham King on August 14, 2016 at 8:01

Interesting website with lots of useful info about the Zetec  http://toyne.org.uk/zetec-engine.html

Comment by Dave Adams on August 14, 2016 at 7:32

the 1.8 with a little tinkering should get to about 150 hp at the flywheel, the focus exhaust manifold is quite good apparently but it can be improved upon (according to pepper performance) who i bought my exhaust from, i went for torque rather than highest HP so they recommended 41mm headers and a 52mm tail. they alter the pipes to suit application if you speak to them. the say that extra HP can be found by altering the exhaust as well as the inlet manifold. perhaps its not just fuelling on your car Paul...though if its leaning out at high RPM that’s not great....

oooh I don’t mean to sound like i am teaching you to suck eggs......your way handier at tuning than me....i don’t tend to look for maximum performance on my cars...although i do have an interest in getting the best from what i have.

Comment by James Doulton on August 14, 2016 at 1:33

If the 1800 injectors are a little small then surely it is just a simple job to swap them for 2L ones. Obviously all of the opening durations would need to be adjusted, so probably another session, but after all of the effort that you have put in and the no-compromises approach then it might be the proper finishing touch. You don't have to use the power if you don't like screaming it but it is nice to know that it is right. Maybe a job for the winter?

Comment by Paul Sheridan on August 14, 2016 at 1:09

What depicts high out put as against medium out put ? 

Comment by Big Vern on August 14, 2016 at 0:42

109rwhp will be about 125 at the flywheel, you sure its a high output 1.8 not the medium output?

1.8HO should easily be 135at the flywheel if its mapped correctly and not sure why you're running out of fuel?

Comment by Paul Sheridan on August 13, 2016 at 19:44

BV,   I have got the print out but its at work. Rwhp ..... 109

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