firecracker Posted December 28, 2004 Share Posted December 28, 2004 I've only just started to get the feel of my narrow bodied SEi so have just started to push it a bit harder. The only thing is it understeers loads and loads. E.g if you go right round a round about it will understeer about 3 quarters of the way round then the tail end will snap out putting you into quite a drift. This is Ok if the roundabout is about 3 lanes wide! So the question is how can I make the front end grip better into a bend and the rear end let go more progressively?? The car has an LSD if thats any help Quote Link to comment Share on other sites More sharing options...
adhawkins Posted December 28, 2004 Share Posted December 28, 2004 What tyres do you have (make and size)? Also, what pressures are you using? Andy Quote Link to comment Share on other sites More sharing options...
firecracker Posted December 28, 2004 Author Share Posted December 28, 2004 Its got 14" Avon CR28 tyres air pressure is about 25psi I think Quote Link to comment Share on other sites More sharing options...
Westfieldman Posted December 28, 2004 Share Posted December 28, 2004 If all the tyres are the same it won't be that they well grip badly or well in the same way throughout the cornner Try Driving style Incorrect tyre pressures Incorrect ride highs Incorrect geometry settings Incorrect corrner weights Badly adjusted anti roll bars Driving style Incosistant grip around the roundabout. Quote Link to comment Share on other sites More sharing options...
Westfieldman Posted December 28, 2004 Share Posted December 28, 2004 Toooooo much pressure try around 15 to 18 psi Quote Link to comment Share on other sites More sharing options...
firecracker Posted December 28, 2004 Author Share Posted December 28, 2004 185/60 turbospeed CR28's (just had a proper look in the garage! Quote Link to comment Share on other sites More sharing options...
firecracker Posted December 28, 2004 Author Share Posted December 28, 2004 Too much pressure? OK I'll check it. Any suggestions if that doesn't work? Quote Link to comment Share on other sites More sharing options...
Blatman Posted December 28, 2004 Share Posted December 28, 2004 Yup, tyre pressure as a start. How old are the fronts? Are they older (and therefore likely to have "gone off" more than the rears). Also... so have just started to push it a bit harder. Depending on how good a driver you are and what you expect a RWD car to handle like, it may be that you're just going in too fast... Quote Link to comment Share on other sites More sharing options...
Blatman Posted December 28, 2004 Share Posted December 28, 2004 Pressure will make a *huge* difference... Quote Link to comment Share on other sites More sharing options...
firecracker Posted December 28, 2004 Author Share Posted December 28, 2004 OK I'll go and try it . The fronts are coming up for a change actually so it may be that. A friend who races one like mine reckons that the front end could go a bit lower too. How will this affect it? Quote Link to comment Share on other sites More sharing options...
Blatman Posted December 28, 2004 Share Posted December 28, 2004 Lower centre of gravity will mean less weight transfer on to the outside wheel, meaning more grip is picked up from the inside wheel before it finally unloads and divorces all of it's duties to the (now overloaded) outside wheel... General rule of thumb is that to increase grip at the front, you soften or lower the front, or stiffen and raise the rear. The same rules apply for the rear, ie if you want more rear grip, soften or lower the rear. Try not to do more than 1 thing at a time, otherwise you won't know which change had the best effect. Also, make a note of your starting point so that you can return to it if you make a change that produces a result you don't like. Make sure you conduct the tests over the same piece of road in similar conditions to the base line test so that the results are as consistent as possible. It would be handy to know what shocks you have, as well as what the spring rates are. What engine and gearbox do you have, and does the car have ARB's at all? Quote Link to comment Share on other sites More sharing options...
firecracker Posted December 28, 2004 Author Share Posted December 28, 2004 Its a crossflow engine with rocket 4 speed gearbox. The shocks are Koni adjustables - not sure about much more than that The car is a 1990 narrow bodied SEi and like I said earlier has a Quaife LSD. There aren't any anti roll bars on it as far as I can see! It also has a quick rack. Quote Link to comment Share on other sites More sharing options...
adhawkins Posted December 28, 2004 Share Posted December 28, 2004 What type of LSD? Plate? ATB? If it's a plate type, and it's set up incorrectly (for a much heavier car for example), I think that can induce understeer too... Andy Quote Link to comment Share on other sites More sharing options...
Blatman Posted December 28, 2004 Share Posted December 28, 2004 Spot on Andy... Quote Link to comment Share on other sites More sharing options...
adhawkins Posted December 28, 2004 Share Posted December 28, 2004 Spot on Andy... OMG, I think that's twice this year... Andy Quote Link to comment Share on other sites More sharing options...
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