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Field SFC-VTEC & Fuel Contoller questions
Posted: Mon Sep 18, 2006 12:43 am
by INVECS
I have a GPX and a Field SFC-VTEC YO!!!!! & Fuel Contoller fitted, was hoping I could get a few things clarified.
The unit allows you to increase the amount of fuel going into the engine by a maximum of 30%, I would assume if it was set at this and you ran for a sustained period of time on it you would damage the engine (correct me if im wrong) I also believe that 30% is possibly a complete waste as I don't know if the fuel is being used effeciently. At the moment i am just trialing different settings. Atm I have a bout 20% increase and cam adjustment kick in at 3000rpm
Anyone have any thoughts? Thanks!
Posted: Mon Sep 18, 2006 12:46 am
by Bennoz
Too much fuel = pinging = bad = burnt pistons = $$$$$
If unsure, get it tuned professionally on a rolling road.
Posted: Mon Sep 18, 2006 12:53 am
by INVECS
Yeah I have every intention of asking my mech

not to worry I am being careful!
Posted: Mon Sep 18, 2006 12:56 am
by Bennoz
Fair play
I mean, if you are able to punch in extra air to burn with that petrol & have it tuned accordingly then you'll be ok.
Posted: Mon Sep 18, 2006 1:02 am
by INVECS
Thankyou

Posted: Mon Sep 18, 2006 1:44 pm
by SG
i've heard of a n/a car leaning out by just fitting the air filter in the big open air part of an aftermarket bumper. not sure how they found it out though but thats like nearly 0.1-0.5 psi of extra air going in the motor or something so its gotta be worth some more fuel
Posted: Mon Sep 18, 2006 2:34 pm
by Liquidity
okay, engines burn air and fuel to create power.
chemically, theres a very specific amount of air per unit of fuel needed for "perfect" combustion. That is, combustion without too much excess heat, or too much excess unburnt fuel.
(lean, and rich, respectively).
So just randomly adding/boosting fuel % is a damn good way to make sure your nowhere near the "ideal" ratio, and a damn good way to reduce engine life.
Also, the cams are set at the ideal position stock. There is no point modifying the cam changeover point unless you've got mods to support it (better breathing, different cams, etc).
The mivec cams, work best from a certain rpm and up. the "normal" cams work best below that point...thus, if you set the mivec point stupidly low (like 3000rpm) your effectively running them in a "bad spot", and completely cutting out the regular cams just as they are starting to come into their "Sweet spot".
Honestly, your f**king with two of the potentially most damaging things, take it do a workshop and get it properly dyno tuned, and you'll see your performance and fuel economy go up across the board.
It really is a "Set and forget" device.
Posted: Mon Sep 18, 2006 2:39 pm
by Liquidity
SG wrote:i've heard of a n/a car leaning out by just fitting the air filter in the big open air part of an aftermarket bumper. not sure how they found it out though but thats like nearly 0.1-0.5 psi of extra air going in the motor or something so its gotta be worth some more fuel
At speed, if its "ram air" the effect might be worth a few psi. otherwise, its just easier breathing. Either way, your intake characterisitics will now be changed, yeah.
from what i read though, the fto's run a teeeensy bit rich stock anyway, and adding an air filter/exhaust actually puts them in the "Sweet spot" quite often (ie, where an aftermarket comp cant make any extra benefit)
Posted: Mon Sep 18, 2006 2:47 pm
by khunjeng
Liquidity wrote:SG wrote:i've heard of a n/a car leaning out by just fitting the air filter in the big open air part of an aftermarket bumper. not sure how they found it out though but thats like nearly 0.1-0.5 psi of extra air going in the motor or something so its gotta be worth some more fuel
At speed, if its "ram air" the effect might be worth a few psi. otherwise, its just easier breathing. Either way, your intake characterisitics will now be changed, yeah.
from what i read though, the fto's run a teeeensy bit rich stock anyway, and adding an air filter/exhaust actually puts them in the "Sweet spot" quite often (ie, where an aftermarket comp cant make any extra benefit)
Mate the AFRs on the stock FTO are not ideal. Run it up and have a look. A SAFC or similar can help fix the AFRs and make sure its running at its best for mods or without.
Posted: Mon Sep 18, 2006 3:51 pm
by INVECS
Liquidity wrote:okay, engines burn air and fuel to create power.
chemically, theres a very specific amount of air per unit of fuel needed for "perfect" combustion. That is, combustion without too much excess heat, or too much excess unburnt fuel.
(lean, and rich, respectively).
I figured this
So just randomly adding/boosting fuel % is a damn good way to make sure your nowhere near the "ideal" ratio, and a damn good way to reduce engine life.
That's what I was worried about....
Also, the cams are set at the ideal position stock. There is no point modifying the cam changeover point unless you've got mods to support it (better breathing, different cams, etc).
The mivec cams, work best from a certain rpm and up. the "normal" cams work best below that point...thus, if you set the mivec point stupidly low (like 3000rpm) your effectively running them in a "bad spot", and completely cutting out the regular cams just as they are starting to come into their "Sweet spot".
Honestly, your f**king with two of the potentially most damaging things, take it do a workshop and get it properly dyno tuned, and you'll see your performance and fuel economy go up across the board.
It really is a "Set and forget" device.
Will do, thanks for the advice, I appreciate the brutal honesty....
Posted: Mon Sep 18, 2006 4:13 pm
by Liquidity
khunjeng wrote:Liquidity wrote:SG wrote:i've heard of a n/a car leaning out by just fitting the air filter in the big open air part of an aftermarket bumper. not sure how they found it out though but thats like nearly 0.1-0.5 psi of extra air going in the motor or something so its gotta be worth some more fuel
At speed, if its "ram air" the effect might be worth a few psi. otherwise, its just easier breathing. Either way, your intake characterisitics will now be changed, yeah.
from what i read though, the fto's run a teeeensy bit rich stock anyway, and adding an air filter/exhaust actually puts them in the "Sweet spot" quite often (ie, where an aftermarket comp cant make any extra benefit)
Mate the AFRs on the stock FTO are not ideal. Run it up and have a look. A SAFC or similar can help fix the AFRs and make sure its running at its best for mods or without.
If you actually read my post, i quite clearly pointed out that the AFR's on a STOCK fto are not ideal, but the addition of a pod filter/exhaust can sometimes lean them out just enough so that an aftermarket computer would have no additional improvement.
Posted: Mon Sep 18, 2006 6:06 pm
by khunjeng
Liquidity wrote:khunjeng wrote:Liquidity wrote:SG wrote:i've heard of a n/a car leaning out by just fitting the air filter in the big open air part of an aftermarket bumper. not sure how they found it out though but thats like nearly 0.1-0.5 psi of extra air going in the motor or something so its gotta be worth some more fuel
At speed, if its "ram air" the effect might be worth a few psi. otherwise, its just easier breathing. Either way, your intake characterisitics will now be changed, yeah.
from what i read though, the fto's run a teeeensy bit rich stock anyway, and adding an air filter/exhaust actually puts them in the "Sweet spot" quite often (ie, where an aftermarket comp cant make any extra benefit)
Mate the AFRs on the stock FTO are not ideal. Run it up and have a look. A SAFC or similar can help fix the AFRs and make sure its running at its best for mods or without.
If you actually read my post, i quite clearly pointed out that the AFR's on a STOCK fto are not ideal, but the addition of a pod filter/exhaust can sometimes lean them out just enough so that an aftermarket computer would have no additional improvement.
not from my experience using a dyno and I have all of the above and the piggy back system cleaned up my AFRs and added about 5rwkw - I have a hi-flo muffler and cat, downpipes and full CAI system.
Posted: Mon Sep 18, 2006 8:55 pm
by Liquidity
of course. I have however read about three times now cases where a piggyback didnt help at all.
That said, a piggyback is an AWESOME device, can eliminate "Flat spots" etc..but i guess i'm suggesting a dyno run FIRST to establish if its needed would be a good idea.
Posted: Mon Sep 18, 2006 10:56 pm
by khunjeng
no this is what you said
If you actually read my post, i quite clearly pointed out that the AFR's on a STOCK fto are not ideal, but the addition of a pod filter/exhaust can sometimes lean them out just enough so that an aftermarket computer would have no additional improvement.
and from experience, its not true and many other memebrs have proved this also.
Posted: Mon Sep 18, 2006 11:07 pm
by FTO338
Yeap i had an SAFC and a Unichip on my FTO before. And yes just the SAFC alone had improved my FTO performance around 10kwatw.
Dyno proven on the day i had it installed. Not keyboard warrior.
And for those in Vic, it was done by Craig, which i'm sure you guys know who he is by now, one of the best APEXi tuner in Oz. So if you not sure, just go and see him.

Posted: Mon Sep 18, 2006 11:22 pm
by Liquidity
khunjeng wrote:no this is what you said
If you actually read my post, i quite clearly pointed out that the AFR's on a STOCK fto are not ideal, but the addition of a pod filter/exhaust can sometimes lean them out just enough so that an aftermarket computer would have no additional improvement.
and from experience, its not true and many other memebrs have proved this also.
I'm not sure what your problem is, but the word "sometimes" has now been highlighted in bold for your viewing pleasure, and if you want me to link you to a few articles (yes, by god, they happen to be "outside" this forum because i happen to be researching a subject *thoroughly*) i can.
Posted: Mon Sep 18, 2006 11:28 pm
by khunjeng
FTO338 wrote:Yeap i had an SAFC and a Unichip on my FTO before. And yes just the SAFC alone had improved my FTO performance around 10kwatw.
Dyno proven on the day i had it installed. Not keyboard warrior.
And for those in Vic, it was done by Craig, which i'm sure you guys know who he is by now, one of the best APEXi tuner in Oz. So if you not sure, just go and see him.

ya craig is the man...I love criag..going to see him this week! I'II say hi Kev..
Posted: Mon Sep 18, 2006 11:29 pm
by FTO338
Liquidity, like i said before, get a FTO then start giving people sh*t here. At least we talk from experience by
WORKING ON OUR OWN FTO. Not bloody google.
BTW khunjeng don't just own a FTO or a member of just one forum. Do your research on that

Posted: Mon Sep 18, 2006 11:39 pm
by khunjeng
Liquidity wrote:khunjeng wrote:no this is what you said
If you actually read my post, i quite clearly pointed out that the AFR's on a STOCK fto are not ideal, but the addition of a pod filter/exhaust can sometimes lean them out just enough so that an aftermarket computer would have no additional improvement.
and from experience, its not true and many other memebrs have proved this also.
I'm not sure what your problem is, but the word "sometimes" has now been highlighted in bold for your viewing pleasure, and if you want me to link you to a few articles (yes, by god, they happen to be "outside" this forum because i happen to be researching a subject *thoroughly*) i can.
ok post your links mate. I wanna read them.
I have done it. So have a lot of people so stop arguing and come back when a. you have an FTO and b. have done it. Yo have no idea mate keep reading your links and wank on to people on another forum...
Posted: Mon Sep 18, 2006 11:40 pm
by Liquidity
Mate, i only sling it *back* as hard as its slung.
if anyone has a go at me without actually reading my comments properly, including yourself, i'm going to point it out
