stuarted Posted July 30, 2008 Posted July 30, 2008 I've gathered you get quicker revs both up and down, you need more revs on pulling away and that you can have problems with lumpy idle and vibration at certain revs. What would be the best for a P1, circa 400bhp, daily use and track days? Cheers Stuart
iain_ogston Posted July 30, 2008 Posted July 30, 2008 Seeing as you are running 400bhp you'll have an aftermarket ECU and remap so lumpy idle needn't be a problem.
stuarted Posted July 30, 2008 Author Posted July 30, 2008 Seeing as you are running 400bhp you'll have an aftermarket ECU and remap so lumpy idle needn't be a problem. Yep, Apexi. Would I need to get the map tweaked to accomodate if I went for one of the low weight ones?
scuba dou Posted July 30, 2008 Posted July 30, 2008 I have the RCM lightened fly wheel and up rated clutch, with RCM front end pulleys a long with a few other bits and bobs. I have none of the aforementioned issues mentioned Spool up is very fast, car revs more like a bike Perhaps you need more aggression to pull away smartly...but 5k and a side step of the clutch peddle tends to get you over that little hurdle See previous Alford sidc vids. Engine braking disappears, as such, but them it’s not an HGV…and that’s why we have big APs... Excellent and very underrated mod IMHO. Jools
scuba dou Posted July 31, 2008 Posted July 31, 2008 (edited) It's the 6.5 kg one I have. http://www.rogerclarkmotorsport.co.uk/shop...sp?productID=98 http://www.rogerclarkmotorsport.co.uk/shop...p?productID=129 Edited July 31, 2008 by Scuba Dou
drb5 Posted July 31, 2008 Posted July 31, 2008 IIRC you lose a couple torques when going to a lightened flywheel. If your determined to do it, take about 4 kilos off your stock flywheel and that'll suffice.
AlanG Posted July 31, 2008 Posted July 31, 2008 I've gathered you get quicker revs both up and down, you need more revs on pulling away and that you can have problems with lumpy idle and vibration at certain revs.What would be the best for a P1, circa 400bhp, daily use and track days? Cheers Stuart Cheapest and most effective way is since the gearbox is coming out, get your own off the engine and have it skimmed. You can half the weight by lightening the std one from around 15Kg to 7.5Kg and it's got a clean surface for your clutch to boot. Any machine shop can do it easily enough and is probably the cheapest way to have a lightened flywheel.
stuarted Posted July 31, 2008 Author Posted July 31, 2008 Cheapest and most effective way is since the gearbox is coming out, get your own off the engine and have it skimmed. You can half the weight by lightening the std one from around 15Kg to 7.5Kg and it's got a clean surface for your clutch to boot. Any machine shop can do it easily enough and is probably the cheapest way to have a lightened flywheel. Thanks for the input guys. Was thinking of an Exedy 5.5kg item, think it's around £275 but if I can get an OE one down to 7.5kg might go down that route. Pulleys will be getting done so looking forward to seeing the results. Cheers again
AlanG Posted July 31, 2008 Posted July 31, 2008 £275 for a flywheel? Ouch! Didn't know they were that kind of price. Nah, better off spendin' £30-40 for a machine shop to lighten a std one!
WUZ Posted July 31, 2008 Posted July 31, 2008 Couldnt agree more alan had mine machined and it cost me 20 quidCan save yourself alot of cash Gordy Crikey - AGRA charged me a lot more to have mine lightened AND BALANCED. Always felt it was worth the extra money to balance it as you don't want an "off-centre inertia effect" (right kind of description?) on the flywheel. Russell
drb5 Posted July 31, 2008 Posted July 31, 2008 Just make sure you get a DECENT place to do it though. Coulty will explain a bit more if he pop's in.
iain_ogston Posted July 31, 2008 Posted July 31, 2008 275 quid sounds about top of the ballpark price range. I was slightly less than that for my original STi motorsport one years ago (think it was 5.4 kg) fitted when an organic clutch went on. Now running an even lighter flywheel which came with my OS Gikken twin-plate racing clutch as a matched/balanced pair. As posted above, engine braking is much less, engine is very blippy and pick up is greatly improved. If you combine a lightened flywheel with correct exhaust/porting/map tweaks turbo lag all but disappears and low end grunt is superb.
WUZ Posted August 1, 2008 Posted August 1, 2008 (edited) Just make sure you get a DECENT place to do it though.Coulty will explain a bit more if he pop's in. Please, feel free to share if you guys feel that "certain places" don't do a good job as I would rather pay extra to go to the right place. Never had an issue with AGRA so far..............they used to build a lot of AWD stuff and built my old MY97 Scoob engine (30K+ @ 360bhp) as well as my Pulsar engine and so far both car still runs well! Russell Edited August 1, 2008 by WUZ
drb5 Posted August 1, 2008 Posted August 1, 2008 You don't need to worry about it mate, as your far enough away from me not to try the place. It was a small company in Dumbarton. IIRC it screwed Stuarts clutch up in no time at all.
AlanG Posted August 1, 2008 Posted August 1, 2008 Sounds like the clutch face part of the flywheel was left rough Dave?
drb5 Posted August 1, 2008 Posted August 1, 2008 I picked it up and never found it to be rough, but then i must admit to not knowing how smooth it should be... Coulty later told me, however looked at it(might be your gearbox man in Hillington) reckoned it had high and low spots, as though it wasn't machined completely flat?
AlanG Posted August 1, 2008 Posted August 1, 2008 I picked it up and never found it to be rough, but then i must admit to not knowing how smooth it should be...Coulty later told me, however looked at it(might be your gearbox man in Hillington) reckoned it had high and low spots, as though it wasn't machined completely flat? Sounds like it wasn't sitting square in the lathe when it was machined..
WUZ Posted August 1, 2008 Posted August 1, 2008 Yup, sounds about right. Cool - I always double check their Skimmed ones anyway with a DTI guage and chuck setup on the vice..............just as a precaution. When people pay you to fit them, you need to be sure your fitting the best stuff you can. Else its always you that looks stupid as you have to change it out for them on your own time. Russell
craigdmcd Posted August 1, 2008 Posted August 1, 2008 The chap in West of Scotland Engineering beside the Kelvin hall in Glasgow wasn't keen to get my GT-B flywheel down to the 7kg mark, and they are well thought of in the Glasgow area. I ended up buying a TTV 6.7kg unit (the ones that are in the Demon Tweeks catalogue). I can get them supplied to your door for £230 the last time I checked.
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