stevemersey

A memorable day in many ways. Not least because of the weather that started miserable, and ended with a biblical downpour and bow waving 7's, but in between dried and gave plenty of good quality track time.

The old Zetec 7 I have has a different but larger gap, not blanked. When I rebuilt it last year I thought about blanking it off, but came to the conclusion it had been ok like that for 19 years, so left it. All is still well. If I used the 7 on gravelly roads I would worry - but I don't.

Kenny, thanks I have made some progress with that information.

Kenny, could you let me know more please, either on here or mail?

I plan to change my 1991 S3 Zetec 1.8 on Webers to injection over the winter and would be interested in any items to help me along and keep the cost down. I would prefer to go the Jenveys, Emerald and injection tank route but will consider other options. So initially looking for: Fuel injection petrol tank. ECU Throttle bodies. Pumps Injectors etc Edited by - stevemersey on 5 Oct 2012 08:56:30 Edited by - stevemersey on 5 Oct 2012 08:56:56

Had mine done this way and my son took it and I think they simply loosened the front coupling and mounting to twist the tail pipe down a little. here

I have also heard that some of the higher power GSXR models have an ECU operated secondary throttle plate Phil, I think most modern bikes have those now, my Kawasaki does, and I believe they can be removed and discarded. Not an uncommon practice amongst bikers. The bigger problem is the fact that later GSXR throttle bodies are in pairs and harder to space.

Phil, I had been previously advised 750 or 1000 cc and will pin it all down eventually. I had not heard of Altiss so that moves things along. There is a guy near us who has a lot of experience in setting things up with megasquirt ecu's, and I am pretty happy with taking on the plumbing myself, so choosing the best throttle bodies to make it as simple as possible is really the most important step.

Andy, Thanks, I will give them some consideration. I am away for a few days from tomorrow and will get in touch on my return.

The 7 has being going very nicely lately so I thought it time to throw a spanner in the works and I have started planning a move to injection. The engine is a 1.8 sliver top zetec. This has to be done with second hand components and a bit of creativity to keep the price down. I also like a challenge so am more than likely going down the motorcycle throttle body route. My own research suggests older GSXR 750 or 1000 parts would fit the bill as the throttle bodies are all separate making spacing that much easier. So my questions are has anyone on here done the conversion using bike parts and can offer any advice on donors other than GSXR? And can throttle bodies that are in pairs rather than singles be easily spaced to fit a zetec?

I have a 91 S3 with clamshells and having recently had a bike fall off the wall and land on one wing I know the stays are very bendable and the most likely cause of trouble. If everything is the right height and level, I would look at the other dimesnions with fore and aft position being a possiblity.

Giles, Thank you for the offer. Those are interesting looking specifications and will give me something to mull over.

Eugene, thank you for that. These tales of 30 mpg give me hope.

High Klunk, It is a 1.8. The previous owner did not have a lot information on the engine. It has visible Raceline external parts and a lightened flywheel and what were described as Kent Cams but no model number. I suspect the head is unmodified. Peak power was given as 125 at the rear wheels at 6500 on the hub dyno. It feels "cammy" but very drivable at low revs. Chokes are 34mm The main jets are 135 Emulsion tubes F16 Idles F8 60 I am suspicious that 60 seems large for the idle jet, and the air bleed similarly rich, yet I can get a very smooth idle at 1000rpm or less at about 1 1/2 turns out on the idle mixture screws. All advice welcome.

Roger, thanks for the comments. The dyno session was short and cheap for us to get a baseline, they made it clear they could not help with webers, and the runs were for our information only so I have no complaint. They were very helpful and seemed to be pretty experienced at working with injection if we need them in the future. I am encouraged by your information though, and will put some effort into improving the set up we have. The car is pretty drivable, I can pootle in traffic quite happily, but it just does not feel as torquey as I might expect. And the fuel consumption and plugs demonstrate that we are way too rich. Andrew, 30mpg sounds a good target to aim for then. We have a gems engine management system that seems to predate any I can see on their website and yes we do have a throttle potentiometer. I am only just looking at the engine management for the first time and will do some further research.