Guy Lowe Posted May 11, 2007 Share Posted May 11, 2007 I have recently switched from A 135BHP 1700 X Flow engine to a Blacktop 2.0L ZETEC from the Focus. With the exception of a lightened flywheel and 4 to 1 exhaust the engine is standard and I have retained my Weber 40's. I was very pleased with the outcome, lots of toque through the rev range, obviously more power and generally much more drivable. However I was disappointed with the performance at high revs, in short it didn't really want to go above 5,500 and if you did, it seemed to take forever to get to 6,500 and didn't seem worth the effort. So yesterday I took it to Sigma to see if a rolling road session would improve anything. At this stage I don't want to mess about with the map as it has the OMEX ECU with the well proven (read tame) Raceline map. The carbs were jetted as per Caterham's spec for the Supersprint i.e. 120 mains F16 emulsions 165 airs 50F9 idles The only thing I had done was change the chokes from 32mm to 34's as many searches of Tech Talk seemed to indicate was the right thing to do, as did few people who had been there before me! On the first run Peter took it up to 4,000, cut the engine, shook his head and muttered "I don't like that, (you have to understand Peter is one of the Old School of engine tuners), put 35 mains in it Bob (Bob is the oily rag but a very nice bloke)". Second run up to 5,000 and again he shuts it off and says "still not enough, try 45 mains". On the third run Peter took it up to 7,000, down and up a few times (it's frightening to watch and yes the primaries do glow red hot) shut it down and announced "that's better". The airs were then changed to 175's and after another run he was happy, said the engine performs well, spent a couple of minutes on the slow running jets and told Bob to make out the bill. I went out this afternoon and the car is totally different, it gets to 7,000 so quickly and the power and torque is there all the way through the rev range, it really feels like a different engine. 😬 I was told by many when I fitted my ZETEC that it will run happily on the Super Sprint carburettor set up, all you have to do is change the chokes to 34mm, well this has proved not to be so in my case and I strongly advise anyone doing the upgrade to put it on a rolling road as soon as it is run in and to anyone thinking of upgrading to the ZETEC - JUST DO IT, you won't be disappointed and the Raceline offer will not last for ever. Guy SB Lowe o *arrowup*o The ZETEC is now running here Link to comment Share on other sites More sharing options...
Gambo Posted May 11, 2007 Share Posted May 11, 2007 NIce job. Would make sense what you did. I would have though a 2.0L would have needed a bit more fuel at the top than a 1.7L Glad you are pleased with it. It looks like a inexpensive(realatively), effective upgrade for X-flow owners. RED 2.0 HPC 230BHP Link to comment Share on other sites More sharing options...
Guy Lowe Posted May 14, 2007 Author Share Posted May 14, 2007 Went out for a longer run yesterday and one other BIG change in the engine has become apparent, FUEL CONSUMPTION *thumbdown*Looks like I will be spending quite a bit of time in petrol stations on the drive to Le Mans Guy SB Lowe o *arrowup*o The ZETEC is now running here Link to comment Share on other sites More sharing options...
Tony Whitley Posted May 14, 2007 Share Posted May 14, 2007 You just can't please some people You should have spent your RR money on throttle bodies, then you'd be getting 30 mpg like we K owners Link to comment Share on other sites More sharing options...
apjenkins Posted May 14, 2007 Share Posted May 14, 2007 Guy, Could you give me details of SIGMA please. Kind regards, @ndrew Link to comment Share on other sites More sharing options...
robert green Posted May 14, 2007 Share Posted May 14, 2007 What mpg are you getting? Surely no less than the xflow? Link to comment Share on other sites More sharing options...
Manxseven Posted May 14, 2007 Share Posted May 14, 2007 Is this the Sigma in Gillingham, Dorset ?? Caterham Fireblade here Edited by - Manxseven on 14 May 2007 13:04:19 Link to comment Share on other sites More sharing options...
Guy Lowe Posted May 14, 2007 Author Share Posted May 14, 2007 Andrew - YHM re SIGMA Robert - No, it is better than the X Flow, but in the 1500 miles I have had the ZETEC I have been geting over 185 miles per tank, not now though Manxseven - Yes that's the one Guy SB Lowe o *arrowup*o The ZETEC is now running here Link to comment Share on other sites More sharing options...
stevefoster Posted May 14, 2007 Share Posted May 14, 2007 😬 😬 😬 Hants (north) / Berkshire club here Area meeting pics here My Racing here Link to comment Share on other sites More sharing options...
Sheds Moderator Posted May 15, 2007 Share Posted May 15, 2007 Well, y'know, power comes from fuel, not air... Good thing you got it done, a 2L engine generating 180 (?) bhp will always need rejetting cf a 1.7 with 135. The chokes will let the air through but the mixture will be too lean at the top end which explains the lack of power. It also explains why your tuner shut it down and put a bigger jet in immediately, a lean engine can burn holes in its pistons ☹️. Happily now you have a correct mixture this won't happen. How long before you fit MegaSquirt? 😬 Link to comment Share on other sites More sharing options...
Paul Formston Posted May 15, 2007 Share Posted May 15, 2007 Hi Guy have you had your car rolling roaded because my 1800 Zetec with stag one cams and a Ammo cylinder head doe's about 30 to 35 MPG on a run the only thing is I have got Throttle Bodys Regards Paul Link to comment Share on other sites More sharing options...
I.Mupferit Posted May 15, 2007 Share Posted May 15, 2007 Throttle bodies will always give you better fuel consumption when properly set up. I noticed quite a difference in range when I changed from carbs to TB's on my old Zetec engined 7. To be honest though I was never that bothered about fuel consumption from my toys. Brent 2.3 DURATEC SV Reassuringly Expensive R 417.39 😬 Link to comment Share on other sites More sharing options...
Guy Lowe Posted May 15, 2007 Author Share Posted May 15, 2007 Paul Webers will never give as good fuel consumption as throttle bodies, however I now think it is quite a bit better that the X Flow, I am not really concerned about the consumption just really pleased with the way it performs Brent The financial issues of the consumption is not a problem, I am just worried that Tony will get fed up with my constant fuel stops and leave me behind and there will be no Toni & Guy at Le Mans 😬 😬 😬 Guy SB Lowe o *arrowup*o The ZETEC is now running here Link to comment Share on other sites More sharing options...
S47zz Posted May 15, 2007 Share Posted May 15, 2007 I have similar setup except TB's and emerald> I get ~25MPG on a 7 style brake fadeing type Blat And 28-30's when I have to drive normally thankfully not too often 😬 Though on the fish n chip run on Sunday got 33+ MPG - used 8,8 gallons doing 292miles *thumbdown* I blame it on the weather Link to comment Share on other sites More sharing options...
Phil Posted July 4, 2007 Share Posted July 4, 2007 I have not driven in anger but I can feel the difference already. It is a no contest decision when you know the difference between the two engine styles. I have enjoyed fitting my engine as much as driving the car. X/FLOW 1700 DD 1990 ROAD USE ONLY..SO FAR Link to comment Share on other sites More sharing options...
Guy Lowe Posted July 4, 2007 Author Share Posted July 4, 2007 It is a no contest decision when you know the difference between the two engine styles Having recently diven to Le Mans and back in mine, I could not agree more 😬 I have enjoyed fitting my engine as much as driving the car Same here, so the 7 will have to go as I want to build a 450HP ULTIMA Can Am now Guy SB Lowe o *arrowup*o ZETEC NOW FOR SALE here Edited by - Guy Lowe on 5 Jul 2007 08:11:44 Link to comment Share on other sites More sharing options...
Big Brother Posted July 5, 2007 Share Posted July 5, 2007 Guy, Your going to need a bigger (wider) garage 😬 Steve SE7EN-UP! Ever noticed that the word enviromentalist contains the word mentalist! Link to comment Share on other sites More sharing options...
Phil Posted July 5, 2007 Share Posted July 5, 2007 Guy, Could you give me details of SIGMA please. Kind regards, PHIL X/FLOW 1700 DD 1990 ROAD USE ONLY..SO FAR Link to comment Share on other sites More sharing options...
Manxseven Posted July 5, 2007 Share Posted July 5, 2007 Sigma Engineering GILLINGHAM, Dorset 01747 823270 (Peter Lander) (Don't have a web-site) Caterham Fireblade here Edited by - Manxseven on 5 Jul 2007 11:22:01 Link to comment Share on other sites More sharing options...
Guy Lowe Posted July 5, 2007 Author Share Posted July 5, 2007 Erh excuse me, are you Guy? 😬 Sigma Engineering Unit 25 Brickfield Industrial Estate Gillingham Dorset SP8 4LT Peter Landers T.01747 823270 Guy SB Lowe o *arrowup*o The ZETEC is now running here Edited by - Guy Lowe on 5 Jul 2007 11:46:43 Link to comment Share on other sites More sharing options...
Phil Posted July 5, 2007 Share Posted July 5, 2007 I thank you I thank you X/FLOW 1700 DD 1990 ROAD USE ONLY..SO FAR Link to comment Share on other sites More sharing options...
Manxseven Posted July 5, 2007 Share Posted July 5, 2007 *arrowup* I'm a good guy 😬 Caterham Fireblade here Link to comment Share on other sites More sharing options...
Phil Posted July 18, 2007 Share Posted July 18, 2007 This is a BTTT for all the lads at the Weld Arms last night Bits from other cars...together at last IT LIVES I have created a MONSTER Link to comment Share on other sites More sharing options...
Phil Posted June 14, 2009 Share Posted June 14, 2009 GUY How much was the rolling road session if you do not mind me asking. FreeRange7 http://good-times.webshots.com/photo/2404840560089816983khvSRw Link to comment Share on other sites More sharing options...
Guy Lowe Posted June 14, 2009 Author Share Posted June 14, 2009 Phil £60 + parts (jets etc.) + vat but that was 2 years ago Guy Now with MORE bhp HERE Link to comment Share on other sites More sharing options...
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