My mk2 Rally car - Duratec power

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  • JonSegger
    Mechanic
    • Jan 2004
    • 513

    My mk2 Rally car - Duratec power

    I had a thread running which covered the rebuild of my rally car: http://www.turbosport.co.uk/showthread.php?t=122375

    Now that the rebuild has sort of finished, I thought I'd start a new thread here recording our progress with the car and its ongoing evolution.

    A quick summary to bring everyone up to date:

    Mine and Mark's last event before the rebuild was the North West Stages at Blackpool in Feb 2007. We retired from that one with a shattered differential. That prompted an axle upgrade, which led to a conversion from leaf springs to a coil-over six linked setup. At the same time I was talked into upgrading the engine to a new Duratec... by my friend Paul Dunnell who builds Duratecs. In summary, the car has had a total rebuild.

    Anyway, fast forwarding to January of this year, the car was just about finished and so we entered the South Downs Stages at Goodwood. We saw this as a bit of a test as its a nice smooth circuit and isn't too harsh on the cars. Net result was a DNF after stage 3 due to: running on 2 cylinders, very poor brakes, oil temperature too high, water temperature too low and a drive train vibration that was so bad I couldn't get my hand on the gear lever at over 70 mph.

    So, there was a list of things to sort out - A new coil pack, new brake pads, a change of master cylinders, propshaft re-balance and a water cooled oil cooler. We did all of these things and then booked into a track day at Snetterton to give it another test. This went a lot better. We had a small problem with a fuel injection rail cracking - and the brakes still weren't that good, but it was certainly quick.

    So... on to our first 'proper' event, the Malcolm Watson Spring Stages at Sculthorpe, last weekend.

    In an attempt to make the brakes better (and following some good advice from some of you chaps http://www.turbosport.co.uk/showthread.php?t=142022), I replaced the EBC front brake pads with some Ferodo ones after scrutineering on the Saturday evening. This made quite an improvement. I did a few laps of the service area to try and bed them in - and then we were ready for Sunday.

    I was a little cautious on the first stage, but we soon had the car sliding all over the place. Probably not the quickest way to get through the stages, but loads of fun! The brakes were working well and there was loads of power. However, halfway through the morning, while waiting between the stage arrival and the start, the throttle started to stick. The heat was getting into the throttle cable and it was going tight. A slight touch on the pedal and it would hit 5 or 6k rpm and then very gradually return back to idle. We were in 'dead time' at this point, so we pulled out of the line of cars waiting to start, opened the bonnet and let all the other cars go through. We were hoping that it would cool down a bit. By the time all the other cars had gone through it was a little bit better, but was still sticking. We did the stage anyway - and for the most part it was OK - although there were a couple of hairy moments when it stuck open going into corners. Running at the back meant we did catch quite a few cars, which was fun because we had something to aim for, but undoubtedly cost us time getting past them.
    After that stage we removed one of the throttle cables (there are two) and wrapped the remaining one that wasn't sticking so much with heat reflective tape. After that it was pretty much fine.

    Stages 1 to 4 were a single lap (around 7 or 8 miles I think). The surface was very abrasive concrete and we used up one set of part worn tyres on those first 4 stages. Stages 5 to 8 in the afternoon were each two laps. We put brand new tyres on before stage 5 and they were pretty well destroyed by the time we got to stage 8. We ran the last two stages with a slow puncture in one of the rears and by the time we finished there were strands of wire sticking out of the fronts.

    We came away with a 3rd in class (2 seconds behind our friends the Mills brothers) and 8th overall. We had a superb day.

    Our next event will be the Honington Stages, Bury St Edmunds, Suffolk on the 3rd May. Just a spanner check and sorting out the throttle cables to do before then...

    Here's a couple of pics.
    Attached Files
  • rallyladgaz
    Spanner Monkey
    • Nov 2008
    • 398

    #2
    Re: My mk2 Rally car - Duratec power

    nice result cant wait to read the next round best of luck

    Comment

    • Wicked
      Bodger
      • Nov 2008
      • 92

      #3
      Re: My mk2 Rally car - Duratec power

      Nice jump Sweet car

      Comment

      • SHIFTYrs2k
        Spanner Monkey
        • Feb 2007
        • 444

        #4
        Re: My mk2 Rally car - Duratec power

        Lovely car John
        sigpic
        S.A.S Motorsport

        Comment

        • PERKY
          Racer
          Decade Plus User
          • Oct 2006
          • 2658

          #5
          Re: My mk2 Rally car - Duratec power

          Good write up and good result
          Keep the event reports coming

          Comment

          • BDA_IT
            Mechanic
            • Oct 2008
            • 617

            #6
            Re: My mk2 Rally car - Duratec power

            Excellent Result Jon, i really enjoyed it last last year i wore out 14 tyres lol luckly only 2 were new! I loved all the Twisty bits and hairpins around the buildings just needed about 30 more BHP :-) Duratec Power next year for me i think!!

            I cant find results how did Andrew Thompson got on in his Focus? Cancel That Found the results!!
            Last edited by BDA_IT; 17-04-2009, 10:01.
            Going Sideways is the way Forward!

            Comment

            • JonSegger
              Mechanic
              • Jan 2004
              • 513

              #7
              Re: My mk2 Rally car - Duratec power

              Cheers all

              We gave the car a check over last night and replaced the throttle cables, wrapping them in a heat reflective sleeve this time.

              The front brake discs have quite a few cracks in, so we'll need to replace them before Honington.

              On closer inspection, its clear that the front tyres wore quite unevenly. You can see from the pics that there is a heavily worn strip around both the outside edge and a couple of inches in from the edge - but the bit between and the rest of the tyre isn't as bad.

              The tyre compound was probably a bit too soft for the abrasive surface, but I'm still not sure why they wore so unevenly. We ran them at around 29-30 psi hot (about 25 cold), which is what we usually run them at. The rear tyres were similar pressures and wore evenly.

              I'm wondering if we need to run a bit more camber...? any ideas/suggestions?

              Other than that, no real damage/problems.
              Attached Files

              Comment

              • dobuy
                Pit Crew
                • Dec 2007
                • 1678

                #8
                Re: My mk2 Rally car - Duratec power

                Well done Jon, love the jump shot
                sigpic
                www.gulfpetrolheads.com

                Comment

                • cossie matt
                  Mechanic
                  • Sep 2005
                  • 983

                  #9
                  Re: My mk2 Rally car - Duratec power

                  What compound were they Jon? What width are they and what width rim are you on?
                  sigpic

                  Comment

                  • JonSegger
                    Mechanic
                    • Jan 2004
                    • 513

                    #10
                    Re: My mk2 Rally car - Duratec power

                    Originally posted by cossie matt
                    What compound were they Jon? What width are they and what width rim are you on?
                    They're Dunlop CR311 x12. 200/530/13. I had some on 7" wheels and some on 8". The ones on the 7" rims came off worse, but I used those on the longer stages, so they would have probably got hotter.

                    Comment

                    • JonSegger
                      Mechanic
                      • Jan 2004
                      • 513

                      #11
                      Re: My mk2 Rally car - Duratec power

                      Bit of bad news over the weekend... the Honington Stages have been cancelled. Still.. I suppose it gives us more time to get the setup right.

                      Comment

                      • cossie matt
                        Mechanic
                        • Sep 2005
                        • 983

                        #12
                        Re: My mk2 Rally car - Duratec power

                        Originally posted by JonSegger
                        They're Dunlop CR311 x12. 200/530/13. I had some on 7" wheels and some on 8". The ones on the 7" rims came off worse, but I used those on the longer stages, so they would have probably got hotter.
                        I use the same on 8's (15's though)and they seem fine, I'm just wondering if the 7's are a bit narrow as it looks like they might have been rolling a bit to produce that funny wear pattern?
                        sigpic

                        Comment

                        • JonSegger
                          Mechanic
                          • Jan 2004
                          • 513

                          #13
                          Re: My mk2 Rally car - Duratec power

                          Originally posted by cossie matt
                          I use the same on 8's (15's though)and they seem fine, I'm just wondering if the 7's are a bit narrow as it looks like they might have been rolling a bit to produce that funny wear pattern?
                          Yeah, that's quite possible I guess. I've recently bought some more 8" wheels, so I can sell the alleycats on now.

                          Comment

                          • Barn
                            Bodger
                            • Mar 2007
                            • 56

                            #14
                            Re: My mk2 Rally car - Duratec power

                            29PSI is way too high Jon.

                            I would look at 24 front and 22 back.

                            Myself and Huw James run at 21PSI all round and works stunning on tarmac

                            Comment

                            • JonSegger
                              Mechanic
                              • Jan 2004
                              • 513

                              #15
                              Re: My mk2 Rally car - Duratec power

                              Originally posted by Barn
                              29PSI is way too high Jon.

                              I would look at 24 front and 22 back.

                              Myself and Huw James run at 21PSI all round and works stunning on tarmac
                              OK, thanks... do you run the same Dunlops? I'll give that a go next time.

                              (you are referring to the pressures when they're hot, are you..?)

                              Comment

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