Field SFC-VTEC & Fuel Contoller questions

INVECS · Post by **INVECS** » Mon Sep 18, 2006 12:43 am

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!

Post by **Bennoz** » Mon Sep 18, 2006 12:46 am

Too much fuel = pinging = bad = burnt pistons = $$$$$

If unsure, get it tuned professionally on a rolling road.

INVECS · Post by **INVECS** » Mon Sep 18, 2006 12:53 am

Yeah I have every intention of asking my mech

not to worry I am being careful!

Post by **Bennoz** » Mon Sep 18, 2006 12:56 am

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.

INVECS · Post by **INVECS** » Mon Sep 18, 2006 1:02 am

Thankyou

SG · Post by SG » Mon Sep 18, 2006 1:44 pm

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

Liquidity · Post by **Liquidity** » Mon Sep 18, 2006 2:34 pm

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.

Liquidity · Post by **Liquidity** » Mon Sep 18, 2006 2:39 pm

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)

khunjeng · Post by **khunjeng** » Mon Sep 18, 2006 2:47 pm

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.

INVECS · Post by **INVECS** » Mon Sep 18, 2006 3:51 pm

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....

Liquidity · Post by **Liquidity** » Mon Sep 18, 2006 4:13 pm

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.

khunjeng · Post by **khunjeng** » Mon Sep 18, 2006 6:06 pm

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.

Liquidity · Post by **Liquidity** » Mon Sep 18, 2006 8:55 pm

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.

khunjeng · Post by **khunjeng** » Mon Sep 18, 2006 10:56 pm

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.

FTO338 · Post by **FTO338** » Mon Sep 18, 2006 11:07 pm

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.

Liquidity · Post by **Liquidity** » Mon Sep 18, 2006 11:22 pm

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.

khunjeng · Post by **khunjeng** » Mon Sep 18, 2006 11:28 pm

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..

FTO338 · Post by **FTO338** » Mon Sep 18, 2006 11:29 pm

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

khunjeng · Post by **khunjeng** » Mon Sep 18, 2006 11:39 pm

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...

Liquidity · Post by **Liquidity** » Mon Sep 18, 2006 11:40 pm

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