J-W-G Posted April 29, 2013 Share Posted April 29, 2013 Ive been doing some research lately on ITB's since i got my silvertop 4age ones for the fe3 and thought of making a topic on ITB's where everyone can contribute knowledge of best set ups, manifolds, tuning and the likes. Ive found these articles which have helped me to understand ITB's abit better and might help others http://www.jenvey.co.uk/jenvey/faq http://www.jenvey.co.uk/jenvey/butterflies-barrels-or-slide-throttles http://www.jenvey.co.uk/jenvey/why-not-just-use-a-big-single-throttle-body http://www.jenvey.co.uk/jenvey/throttle-body-selection-with-jenvey-dynamics And a good diagram for ITB's/EFi in general http://www.jenvey.co.uk/images/stories/jenvey/fuel%20system%20-%20collector%20pot.pdf Feel free to contribute 1 Quote Link to comment Share on other sites More sharing options...
Spencer Posted April 29, 2013 Share Posted April 29, 2013 I think we had a throttle body thread, Edit: //oldschool.co.nz/index.php?/topic/28097-individual-throttle-body-tech/page__hl__throttle Quote Link to comment Share on other sites More sharing options...
J-W-G Posted April 29, 2013 Author Share Posted April 29, 2013 Funny i did a search? Must not have looked properly... feel free to delete and ill add on to the existing thread Quote Link to comment Share on other sites More sharing options...
Spencer Posted April 29, 2013 Share Posted April 29, 2013 The search is dicky, you need to use the advance search and be very specific I may merge them, that thread is pretty old now just chucked it up for your reference, I'll read through it later and see how much of a idiot I was in there haha Quote Link to comment Share on other sites More sharing options...
beachlander Posted April 29, 2013 Share Posted April 29, 2013 This is relative to my interests, will have a lot of questions soon haha. Quote Link to comment Share on other sites More sharing options...
J-W-G Posted April 29, 2013 Author Share Posted April 29, 2013 Sweet as Spencer. Im still a we bit off making the manifold and getting the ITB's even on the engine but im just gathering all the info i need before fucking something up Quote Link to comment Share on other sites More sharing options...
mikuni Posted April 29, 2013 Share Posted April 29, 2013 You can't fuck up too much, biggest thing with the 20V throttles is spacing to suit your ports for straight runners, and packaging of everything (throttle linkages, injectors, fuel rail, air box,etc). Quote Link to comment Share on other sites More sharing options...
Rookie Posted April 29, 2013 Share Posted April 29, 2013 What would you guys recommend to tune with Speed-Density or Alpha-N and why? Quote Link to comment Share on other sites More sharing options...
Spencer Posted April 29, 2013 Share Posted April 29, 2013 I have only done a couple cars but Alpha-N for sure, after tapping each runner and stuffing with accumulators the vacuum signal you get is still to weak. Obviously the vacuum signal gets worse with bigger cams aswell. There is a blended alpha-N & speed-density algorithm but I have never had a crack with it KPR can add more 1 Quote Link to comment Share on other sites More sharing options...
kpr Posted April 29, 2013 Share Posted April 29, 2013 too slow. heres what i wrote anyway.. pretty sure explained it in that other thread spencer posted. but short version alpha n - use it speed density. (map) - doesn't work. as you hit 0 vac well before throttles are 100% open. depending how you try to tune around it; you end up either running lean at 100% throttle or very rich somewhere before 100%. we'll say 70% just to throw a rough number out there - this all after you have sorted out a nice dampened signal Quote Link to comment Share on other sites More sharing options...
kpr Posted April 29, 2013 Share Posted April 29, 2013 oh and blended works good also. but i found it really wasn't worth the extra effort. both the extra tuning required and setting up a clean dampened vac signal. you can get a pretty spot on tune with just alpha n, ecu with baro compensation helps here also Quote Link to comment Share on other sites More sharing options...
Rookie Posted April 29, 2013 Share Posted April 29, 2013 Cheers guys, pretty much just as I thought. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.