Tango Posted May 21, 2019 Author Report Share Posted May 21, 2019 I would load a pic but too embarrassed. Put new rubber on the rear and it's obvious that the original rubber was grossly over inflating due to heat input on track as the wear pattern showed a thin (bicycle tyre width) contact area with the very centre line with no rubber compound at all. Think we'll start the next session at 23 psi and measure the pressure directly after coming off track and adjust accordingly. Also put the car on the dyno and it appears the original map was set for over fueling and timing to minimise heat input for engine reliability during the 24 hour endurance race it was built for. Long learning curve but hopefully steady progress and more horse power could well be available. Quote Link to comment Share on other sites More sharing options...
Rich Posted May 22, 2019 Report Share Posted May 22, 2019 I think we need photos Terry! Quote Link to comment Share on other sites More sharing options...
Tony Posted May 22, 2019 Report Share Posted May 22, 2019 At work we was studying the video again and we have agreed the rear is under-damped..... You can the suspension rebound is not being controlled. Quote Link to comment Share on other sites More sharing options...
Tango Posted June 1, 2019 Author Report Share Posted June 1, 2019 The clutch called it a day a couple of weeks ago, intermittent problems changing gears so not obvious what the problem was especially as clutch isn't that old. We took it to Rogue to disassemble and they found what appears to be bits of clutch cover broken off and stuck in the clutch fingers. New clutch fitted and all well again so far. Also found something behind the driveshaft seals had completely melted from hot oil temperatures, possibly a slosh guard or similar. The sister car is still racing in the 750 motor club race series (without it's supercharger) and it's completed 3x24 hour races with the same type clutch without any problems or melting parts but it's been fitted with with a gearbox oil cooler. Ordered a Earls cooler which arrived a couple of days ago, too late for JDM at Castle Combe today. Pleased to say the new rear tyres appear to have solved the handling problems although the track temperature was pretty high today and the numpty driver didn't check the pressures before the last session and it was a little tail happy again. So gear oil cooler and softer springs to be fitted before the next track day, and before fitting the Rotrex. Quote Link to comment Share on other sites More sharing options...
adam_r Posted June 2, 2019 Report Share Posted June 2, 2019 Glad you found the clutch issue and it was relatively easy to fix. What are those chunks of metal from though? Quote Link to comment Share on other sites More sharing options...
Tony Posted June 2, 2019 Report Share Posted June 2, 2019 Wow that's one hell of a clutch condition..... Looking at the size of the debris it's lucky there wasn't more damage..... If I'm reading things correctly it seems you are changing the coils for a lesser rate which is great news because the vid showed the rear was well under damped and terrible rebound. Quote Link to comment Share on other sites More sharing options...
Tango Posted June 2, 2019 Author Report Share Posted June 2, 2019 9 hours ago, adam_r said: Glad you found the clutch issue and it was relatively easy to fix. What are those chunks of metal from though? It's a closed unit so possibly its 3 bits that have broken away from the assembly between the face plate and outer steel cover clutch cover. Would have liked to investigate further but the broken bits are in the Rogue scrap bin, 86 miles away. Just very relieved it wasn't the gearbox. 4 hours ago, Tony said: Wow that's one hell of a clutch condition..... Looking at the size of the debris it's lucky there wasn't more damage..... If I'm reading things correctly it seems you are changing the coils for a lesser rate which is great news because the vid showed the rear was well under damped and terrible rebound. Rear springs on the coilovers currently are 10kg x 180mm on softest setting so looking at 8 kg as think 5 kg might be too soft. what do you think? Quote Link to comment Share on other sites More sharing options...
Tony Posted June 2, 2019 Report Share Posted June 2, 2019 I'm not qualified to comment, reason being i can only use and convert in lb's. However i could if you want call on MeisterR who are a leading top shelf developer and ask them to take you under their guidance/ development? Quote Link to comment Share on other sites More sharing options...
Tango Posted June 4, 2019 Author Report Share Posted June 4, 2019 It ran fine at the JDM Combe event last Saturday except for the last session where we think the combination of tyre pressures and lack of dampening on the rear caused a couple of problems just riding uneven surfaces on the straights. Unfortunately the car was sent back out on track immediately after the last session for a 'top 25' parade lap which meant cruising around in convoy with press/TV in an open top vehicle so (a) didn't have time to check the pressures while the tyres were hot and (b) unable to top up the tank so only just made it off the track before running out of fuel. With the new rubber the car carries a lot more speed through the corners so exaggerates any instability. Really have got to sort this before getting a remap let alone a charger. Quote Link to comment Share on other sites More sharing options...
Tango Posted June 8, 2019 Author Report Share Posted June 8, 2019 The car made the July edition, quite a good review too Quote Link to comment Share on other sites More sharing options...
Tony Posted June 9, 2019 Report Share Posted June 9, 2019 Wow great write up.... A nice reward given the time, effort and money involved. Quote Link to comment Share on other sites More sharing options...
Tango Posted June 9, 2019 Author Report Share Posted June 9, 2019 4 hours ago, Tony said: Wow great write up.... A nice reward given the time, effort and money involved. There's another 3 pages of write up and pics so yes well pleased especially for him as it wasn't/isn't easy to do with a tight budget, just a lot of effort and time. Quote Link to comment Share on other sites More sharing options...
Tony Posted June 9, 2019 Report Share Posted June 9, 2019 Obviously it does mean peoples expectation of him on track will be a little higher now..... Quote Link to comment Share on other sites More sharing options...
Rich Posted June 9, 2019 Report Share Posted June 9, 2019 Nice one Terry, I might pick up a copy next time I'm in town 1 Quote Link to comment Share on other sites More sharing options...
Tango Posted June 9, 2019 Author Report Share Posted June 9, 2019 2 hours ago, Tony said: Obviously it does mean peoples expectation of him on track will be a little higher now..... He took it to a show at Santa Pod today but he said it was just a car meet so wouldn't put it on the strip... yea right. Just sent me a copy of of his three runs.. Only 0.2 seconds slower than a 310bhp MR2 turbo in a straight line, probably because of the extra torque. Hate to think what the car will do when it's correctly mapped and charged. Better sort out the suspension niggles then Quote Link to comment Share on other sites More sharing options...
Tango Posted June 9, 2019 Author Report Share Posted June 9, 2019 Don't know why he thought taking on a 500-600 bhp GTR was a good idea though ...David and Goliath springs to mind. WNXY9392.MP4 Quote Link to comment Share on other sites More sharing options...
Tony Posted June 10, 2019 Report Share Posted June 10, 2019 Well it wasn't embarrassed by the GTR..... Fairplay for trying. Quote Link to comment Share on other sites More sharing options...
Tango Posted June 10, 2019 Author Report Share Posted June 10, 2019 Bit unnecessary though, not a lot of skill in running a track car in a straight line just extra wear and tear on the running gear. Had a few words Quote Link to comment Share on other sites More sharing options...
Tony Posted June 10, 2019 Report Share Posted June 10, 2019 I bet you did ..... I can kind of understand his need for speed, although i would suggest next time pare with a lesser opponent Quote Link to comment Share on other sites More sharing options...
Rich Posted June 10, 2019 Report Share Posted June 10, 2019 6 hours ago, Tango said: Bit unnecessary though, not a lot of skill in running a track car in a straight line just extra wear and tear on the running gear. Had a few words How much extra wear and tear would that run(s) realistically add? Quote Link to comment Share on other sites More sharing options...
Tony Posted June 10, 2019 Report Share Posted June 10, 2019 It's not top fuel and a drag clutch so on an "advanced" engine i can't see the harm. Learning the car even in a straight line does offer a learning curve that works well in translation. Quote Link to comment Share on other sites More sharing options...
Tango Posted June 11, 2019 Author Report Share Posted June 11, 2019 Why put a circuit car on a drag strip? Just doesn't make sense. It's all about BHP and getting that power down so the outcome of going up against a car with a lot more BHP over 1/4 mile is fairly predicable. OK the power to weight ratio will make a difference and no doubt that GTR would lose out on the circuit and as for doing it again against a 'lesser' opponent well again what's the point? Quote Link to comment Share on other sites More sharing options...
Tony Posted June 11, 2019 Report Share Posted June 11, 2019 I doubt he was expecting a win but as an experience it's worth a go.... Quote Link to comment Share on other sites More sharing options...
Tango Posted July 9, 2019 Author Report Share Posted July 9, 2019 Well I did tell him not to put a circuit car on a drag strip.....completely sheared a driveshaft like snapping a carrot. OK the car doesn't weigh much but holding high revs and dropping the clutch from a standstill with R888 sticky tyres will definitely test the complete drivechain. Just fortunate the weak link was only the shaft. LVEB5740.MP4 Quote Link to comment Share on other sites More sharing options...
Tony Posted July 9, 2019 Report Share Posted July 9, 2019 That's broke ..... He could buy a stiffer CV boot Quote Link to comment Share on other sites More sharing options...
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