conswaylos Posted October 29, 2014 Share Posted October 29, 2014 hi, I have searched all over and haven't seen anyone using the BC springs, the cruise seems to be a popular choice.Does anyone have any specs on any of these springs, most import, seated tension. I don't want a too stiff spring to shorten the life of my cams but i also want to rev to 8800 to 9000rpm. Im open to suggestions of other brands. Please advise. Thank you,Navin Quote Link to post Share on other sites
maddox710 Posted October 29, 2014 Share Posted October 29, 2014 Contact Mike at tuning developments. He has a few sets on the shelf ready to go Quote Link to post Share on other sites
AdamB Posted October 29, 2014 Share Posted October 29, 2014 Supertech, no point going anywhere else as no one knows/releases the specs of their valvetrain gear. Quote Link to post Share on other sites
conswaylos Posted October 30, 2014 Author Share Posted October 30, 2014 where can i get a set of supertech or is it a custom set that i would need to contact supertech??? im very new to this forum maddox710, where can i find mike?? Quote Link to post Share on other sites
maddox710 Posted October 30, 2014 Share Posted October 30, 2014 Warrington England, visit there websites and give them a call Quote Link to post Share on other sites
AdamB Posted October 30, 2014 Share Posted October 30, 2014 where can i get a set of supertech or is it a custom set that i would need to contact supertech??? im very new to this forum maddox710, where can i find mike?? http://www.ipg-supertech.com/ Quote Link to post Share on other sites
Phil Posted October 30, 2014 Share Posted October 30, 2014 (edited) do supertech sell exhaust valves on their own? cant see any 4efte valves on their site. Phil Edited October 30, 2014 by Phil Quote Link to post Share on other sites
AdamB Posted October 30, 2014 Share Posted October 30, 2014 (edited) do supertech sell exhaust valves on their own? cant see any 4efte valves on their site. PhilYes they do, you have to go through PEC though as they have had valves made by supertech for the E series head. Same ones that Abbott is running. Or ask supertech to do a custom set for you. Edited October 30, 2014 by AdamB Quote Link to post Share on other sites
Phil Posted October 30, 2014 Share Posted October 30, 2014 Yes they do, you have to go through PEC though as they have had valves made by supertech for the E series head. Same ones that Abbott is running.Or ask supertech to do a custom set for you. they says 25mm (+1mm) which is what? 26 mm or are they saying stock is 24? Phil Quote Link to post Share on other sites
AdamB Posted October 30, 2014 Share Posted October 30, 2014 26mm Quote Link to post Share on other sites
Phil Posted October 30, 2014 Share Posted October 30, 2014 (edited) yeah i knew something wasnt right! lol Edited October 30, 2014 by Phil Quote Link to post Share on other sites
jordan walker Posted January 31, 2015 Share Posted January 31, 2015 do supertech sell exhaust valves on their own? cant see any 4efte valves on their site. PhilSorry to bring up an old thread but why do you say exhaust valves on there own phil? Is it only nesecery to do the exhaust valves? Are they more of a restriction? Or is it just down to personal preference? Quote Link to post Share on other sites
Phil Posted January 31, 2015 Share Posted January 31, 2015 the exhaust/intake ratio is the balance that needs redressed on a 4efte for more performance. the intake vales are something like 28mm and the exhaust ones are 24? ish ( i knew the exact numbers once) lol now on most modern turbo engines those numbers would be closer together. the intake valve actually lets in compressed air(turbo) plus active suck/pull cycle (4 stroke) meaning the valve throat dia gets plenty of flow help. whereas the exhaust valves yes have the upstroke pushing the gases out but only passive(not active) help from the lower pressure in the exhaust/turbo. so you at full throttle big spec motor you will end up with some gases staying within the cyclinder and going through another cycle... reducing the availible CC that can be filled with oxygen/fuel rich air from the intake. high comp helps this (less potential waste air left after up stroke) high lift/longer duration cams may alleviate the issue by giving more space/time for escape of waste air. but your valves/seat/throats is the no1 restriction. change that you change everything. Phil Quote Link to post Share on other sites
5e colin Posted January 31, 2015 Share Posted January 31, 2015 ^^^ cant you use intake valve for the exhaust there equal size then ???? Quote Link to post Share on other sites
Phil Posted January 31, 2015 Share Posted January 31, 2015 ^^^ cant you use intake valve for the exhaust there equal size then ???? you dint want them equal, just the differential to be less. also i doubt they would fit, i cant remember the sizes of the top of my head but something like 27mm is max exhaust size you could fit in. (supra valves would work with reground cams) Phil Quote Link to post Share on other sites
AdamB Posted February 3, 2015 Share Posted February 3, 2015 Exhaust valves should be sized 90%-92% of the inlet valve in a forced inducted motor. As stock 29.5mm intake and 26mm exhaust, it is only 88%. This where the E series engine is the eco of Toyota's range where something called internal EGR takes over. Where the exhaust gas is left remaining in the cylinder after combustion when we don't want it there for performance sake. Meaning to get the 90-92% target the exhaust valves would need to be sized at 26.5mm - 27.5mm. Quote Link to post Share on other sites
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