taffyracer Posted February 1, 2009 Share Posted February 1, 2009 What size is the standard VVC throttle body, am i right in thinking there is a simple upgrade in fitting a larger TB? http://www.xlraceparts.com Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted February 1, 2009 Share Posted February 1, 2009 What do you want measuring ? The bore of the inlet that the foam air filter fits to ? Link to comment Share on other sites More sharing options...
nickh7 Posted February 1, 2009 Share Posted February 1, 2009 just fitted a 52mm in place of the standard one on a 1600 ss and the filter was a straight swap but the actual butterfly looked huge compared to the 48 I'd taken off. Fuel your Addiction here Link to comment Share on other sites More sharing options...
taffyracer Posted February 1, 2009 Author Share Posted February 1, 2009 Just really want to know what the standard size of the inlet is, not sure what size standard is so not sure what size equates to an upgrade http://www.xlraceparts.com Link to comment Share on other sites More sharing options...
oilyhands Posted February 1, 2009 Share Posted February 1, 2009 The 143BHP VVC has a 48mm TB, the 156BHP vernsions has a 52mm TB, most 48mm TBs are plastic, most ally TBs are 52mm. Oily Link to comment Share on other sites More sharing options...
taffyracer Posted February 1, 2009 Author Share Posted February 1, 2009 great, cheers oily, mine is plastic I believe, would explain why it didn't feel as fast as I was expecting, are the TB's interchangeable so that a 52mm is a straight fit and is it worthwhile? http://www.xlraceparts.com Edited by - taffyracer on 1 Feb 2009 18:50:59 Link to comment Share on other sites More sharing options...
jackb_ms Posted February 1, 2009 Share Posted February 1, 2009 takes the best part of 10minute to replace a 48mm TB by a 52. And it is a worth while upgrade Jack Emily, The Very Yellow 21 Link to comment Share on other sites More sharing options...
oilyhands Posted February 1, 2009 Share Posted February 1, 2009 What he said . The main improvement is in throttle response. Oily Link to comment Share on other sites More sharing options...
taffyracer Posted February 1, 2009 Author Share Posted February 1, 2009 ok cheers, will try and source one, can anyone point in the direction of somewhere I can get a full spec of the various K series VVC models so I can see the differences between the models? http://www.xlraceparts.com Edited by - taffyracer on 1 Feb 2009 22:04:53 Link to comment Share on other sites More sharing options...
oilyhands Posted February 1, 2009 Share Posted February 1, 2009 The differences between the 143VVC and 156 are.. 1 52mm TB 2 Machining of the head around the inlet and exhaust valves both in the valve throats and combustion chamber to improve low lift flow 3 new/ recalibrated ECU 4 changed exhaust manifold 5 revised pistons with marginally higher compression and expanded ring belt to strengthen ring lands, indentifiable by '160' engraved on the crown There are some detailed diferences due to the change from EU2 to EU3 (smaller injectors, plug top coils, integral IAT/MAP sensor PWM idle valve rather than stepper motor). Oily Link to comment Share on other sites More sharing options...
taffyracer Posted February 1, 2009 Author Share Posted February 1, 2009 ok, that's sounds like a fair bit, are there any defining info available on any of the casings or ecu to identify this as the lower output version, i only had a quick look but i'm fairly sure the TB is plastic, the plan was to go down the vvc removal route with with cams, TB's and ECU to get to 190-200bhp, does this make it alot more difficult http://www.xlraceparts.com Edited by - taffyracer on 1 Feb 2009 22:43:23 Link to comment Share on other sites More sharing options...
Jason Plato Posted February 2, 2009 Share Posted February 2, 2009 save your money Taffy and simply fit bodies, cams etc and ecu all at once for 200bhp ..... do you have a slippy diff ? Dave here is C7 TOP Taffia joint AO with Al Link to comment Share on other sites More sharing options...
oilyhands Posted February 2, 2009 Share Posted February 2, 2009 You wont get to 200BHP with just bolt ons, you will need some head work and a change of valve springs so you can fit decent cams, the pistons on the 143VVC will dissolve at anyhting above 180BHP so you must swap for forged pistons. A good yardstick for a 156 VVC is plug-top coils, ally TB and a naturally coloured plenum rather than a painted one with VVC emblazoned on the top. Note that not all 156 VVC engines have the better pistons although they *should* have, it looks as if stock bottom ends were used on a significant number of the engine used in Caterhams. Oily Link to comment Share on other sites More sharing options...
taffyracer Posted February 2, 2009 Author Share Posted February 2, 2009 Yep it is a slipper and that sounds exactly like my engine, bugger, was told it was a 156 version! http://www.xlraceparts.com Edited by - taffyracer on 2 Feb 2009 16:47:31 Link to comment Share on other sites More sharing options...
taffyracer Posted February 2, 2009 Author Share Posted February 2, 2009 anybody have a pic of a 156bhp VVC? http://www.xlraceparts.com Link to comment Share on other sites More sharing options...
oilyhands Posted February 2, 2009 Share Posted February 2, 2009 Taff, Categorically.. yours is a 143BHP engine. Oily Link to comment Share on other sites More sharing options...
jackb_ms Posted February 2, 2009 Share Posted February 2, 2009 Oily What is the cost involve in changing the pistons (parts and labour)? I'm still planning in upgarding my VVC which hopefully might take it to the 180 mark Cheers Jack Emily, The Very Yellow 21 Link to comment Share on other sites More sharing options...
oilyhands Posted February 2, 2009 Share Posted February 2, 2009 It's pretty expensive.. mail me for a detailed response.. oily Link to comment Share on other sites More sharing options...
taffyracer Posted February 4, 2009 Author Share Posted February 4, 2009 sorry to drag this back up, is the 56mm TB a recognised and worthwhile upgrade as well? http://www.xlraceparts.com Link to comment Share on other sites More sharing options...
oilyhands Posted February 4, 2009 Share Posted February 4, 2009 Did some back to back tests a long time ago on a modified VVC, the 56mm TB made slightly less power everywhere and made it's best power when not fully open. Oily Link to comment Share on other sites More sharing options...
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