I'm getting ready to buy a VAFC from my friend for like $150 and my question is what all does it do other than act as a vtec controller? Also is this the correct section to post?
yes, this is the correct section, i think. but it also acts as an air/fuel converter like you can adjust your correction (how much more/less fuel gets into the combustion chamber) as well as a vtec controllerNoWayBack91Si said:I'm getting ready to buy a VAFC from my friend for like $150 and my question is what all does it do other than act as a vtec controller? Also is this the correct section to post?
Not really. A stock motor can gain from a SAFC. The stock map isn't exactly optimal. But it is good enough for basic bolt ons is I guess what you are pointing at.oc_civic said:you will nto have any gains unless you get the car tuned on a dyno... and even then its a maybe...
it is generally only usefull if your current setup is out of spec due to things like cams.. forced induction... springs/retainers... built motor in general.. etc..
you hit on on the head.. SURE it MIGHT pick up a BIT.. but enough to warrant the price? not IMO.. the need doesnt really arise till some more serious work is done.. i mean this is just my opinion.. and as you said.. YES i mean in reference to basic bolt ons.. and the factory settings being relatively good enough...93turbo16 said:Not really. A stock motor can gain from a SAFC. The stock map isn't exactly optimal. But it is good enough for basic bolt ons is I guess what you are pointing at.
for the gains you get on a basically stock motor, its not worth the price. i just have one cuz i got it practically freeoc_civic said:you hit on on the head.. SURE it MIGHT pick up a BIT.. but enough to warrant the price? not IMO.. the need doesnt really arise till some more serious work is done.. i mean this is just my opinion.. and as you said.. YES i mean in reference to basic bolt ons.. and the factory settings being relatively good enough...
the only way you can "tune it on the street" is with a a/f gauge using a wideband o2 sensor .. which to my knowledge is pretty expensive.. there is no way to drive up and down the street and just guess the values..93turbo16 said:And by price I mean something around $200. Including the afc and tuning on the street. Dyno would of course be a bit more..
thats what im doing. my friend has a wideband 02 setup on his turbo 3g eclipse, since he had an extra bung, i welded that into my downpipe and sometime this summer were gonna hook up his gauge to my car and tune it on the road.oc_civic said:the only way you can "tune it on the street" is with a a/f gauge using a wideband o2 sensor .. which to my knowledge is pretty expensive.. there is no way to drive up and down the street and just guess the values..
adjusting the fueling of a car is ONLY usefull if you have a way to measure the combustion process..
Which to my knowledge is provided by the tuner. When someone comes to me, I hook up my own wideband on their car. I prefer a street tune for a street car that is just looking for some extra power. After you do enough of them you can just feel what a car needs just by riding along and checking plugs/datalogs.oc_civic said:the only way you can "tune it on the street" is with a a/f gauge using a wideband o2 sensor .. which to my knowledge is pretty expensive.. there is no way to drive up and down the street and just guess the values..
adjusting the fueling of a car is ONLY usefull if you have a way to measure the combustion process..
i understand your intention.. but the word "street tune" is way over used on this site to denote just random adjustments on the street by the "feel" of the car... which obviously you understand why i would not advise...93turbo16 said:Which to my knowledge is provided by the tuner. When someone comes to me, I hook up my own wideband on their car. I prefer a street tune for a street car that is just looking for some extra power. After you do enough of them you can just feel what a car needs just by riding along and checking plugs/datalogs.
And to my knowledge I didn't say anything about just driving it up and down the street and tuning it without a guage. I said that a "street tune" would be sufficient, which I would think a tuner would be in the car with a wideband.
But anyway, if you are getting a hook up on the dyno and the install of the part, you should see some decent gains from it. Another thing to look into would be a nice set of cam gears before you hit the dyno. There is always hidden power with some adjustments.
Understandable. Wideband street tuning might be a better way to put it.oc_civic said:i understand your intention.. but the word "street tune" is way over used on this site to denote just random adjustments on the street by the "feel" of the car... which obviously you understand why i would not advise...
advancing your vtec engagement is not a good thing on a stock/bolt on car, it wont help, and theres a good chance you will actually lose power. but, people usually experience slight gains from retarding the crossover, which is what i did. i set it back to 6k and changed the correction a bit, the crossover is quite a bit more noticable now. but once i actually get the wideband and start tuning im probably going to put it back to stock (5500) i just did this because it was what i was told to do by some ppl on here. it is just something that you can do if your not doing a complete tune or if you dont have a gauge to work withSCCRules said:when you lower the vtec engagement point does it really even help you out that much if at all? I mean I would like to lower mine maybe to around 5300rpm [only 300rpm less] because if I remember right I think that's where I land when I shift around 6800rpm. and with me rockin a D I dont think it would very much at all. My friend has one on his EJ8 and it doesnt seem to have helped at all really.