jaycar DFA or SAFC unit on 20v throttles?

[DaveW]

hey guys,

i kno this sorta thing has been covered a million times but i couldnt find anything for my specific question..

im looking at running 20v inlet system (ie injectors, quad throttles all that jazz) on my 16v head. My understanding is that the stock ECU has troubles with the fuel/air ratio is this right??

so since a aftermarket ECU is simply not on the cards ( so pls dont suggest) i was wondering if one of those SAFC units or the jaycar Digital Fuel Adjuster is an adequate solution?

can these devices be used to simply lean out or richen the fuel mixture over the rpm range to compensate for the computer struggling with the 20v throttle setup?

or does the problem with the 20vs run deeper than my understanding...

thnx
Dave

[jezza323]

the quads will result in strange MAP readings that a 16v ECU cant understand, a SAFC/DFA simply takes the MAP signal, looks it up in a table, and outputs a different signal, so yes, it could work, how well is anyones guess, unless they have tried it

[Ben Wilson]

Can you even get a SAFC for an AFM 4AG?

[c2888]

I've seen it work successfully on a 3SGE map sensored type, 20v throttles, custom manifold
It started and ran well enough to drive to the dyno where the SAFC2 was tuned.

You'd probably get more out of it if you could play with ignition and fuel seperately, but you are looking towards a emanage full kit, or just go something all out like microtech, haltech, wolf, megasquirt et al

I think it read on autospeed where they tried to 'bend' the afm signal and weren't successful. Tho if you really wanted to keep a factory ecu, you could get the map sensored setup from a AE82, just depends how much you can do, and how much of the folding stuff you have in your pocket

http://autospeed.drive.com.au/cms/A_0121/article.html

Dan

[DaveW]

thanks for the replies guys, shouldve mentioned though its MAP not AFM tho....


wat about the jaycar DFA? is it capable of the same task?

[Ben Wilson]

I'd assumed it was the mr2 motor.

The DFA will only work with a pulsed signal from what I understand, a SAFC is probably your best bet (not that I've ever worked with one).

[Toysrme]

SAFC's are a joke. Cheap, poor tuning resolution. Buy a real piggyback.
Perfect Power's SMT5, 6, or 7, Or a *fully* upgraded E-manage.
The jaycar DFA. That's what was in autopseed. It doesn't exactly have the world's greatest resolution of tuning either. I read about it & thought it was a waste of money. There are pre-built things that are slicker & do a better job. Hell it's just a big, ugly, SAFC-II...
You've got things like SMT6's that were coming out around the same time. Yet they'll do ignition, analog, and frequency tuning all at the same time, and have a triggerable output. All while having a higher reloution in tuning than an SAFC, DFA, or e-manage. AND scaleable outputs to different voltage inputs besides RPM * load sensor. AND they carry two entire sets of maps you can swap between.
Why the hell would anyone settle for less over $30usd???
The assembled units are:
Digital Fuel Adjuster = $299.00aud
Hand Controller for Digital Adjuster kits = $139.00aud
Requires RS232 Connecting Computer Lead = $8.35aud
$445.35aud. What the fuck??? For $484.104 aud at the current exchange rate. You can buy an smt6 + data cable from one of the Canadian perfect Power dealers that is also into Toyota trucks & MR2's.

Who would anyone buy an entry level piggyback when $30usd more will buy you the most advanced piggyback on Earth until the SMT7 & E-manage ultimates hit the shelves in early 2006???





Regardless. SAFC's are a piss-poor excuse for tuning. The originals are literally nothing more than 5 pots wired in seires and triggered between each other based on an RPM switch (You could literally build a basic 2 position SAFC with a 4 pots, a microswitch, and a relay), the new ones are nothing more than electronic versions of the old with "pretty blue screens".








Are you taking your map reading from one runner, or all of them? You should have all your intakes T'ed together & connected to your map. Otherwise it will fluctuate very wildly as opposed to just sorta wildly.

[Toysrme]

^ my memory of it. Is that one DFA is analog votlage tuning, one is pulsed tuning.

[TA-022]

$484.104 aud at the current exchange rate. You can buy an smt6 + data cable

+ shipping + insurance + customs / duties

which is the problem with getting these things etc

[DaveW]

thanks for the replies guys been very helpful. i think im gonna have to inevitably hold off until i buy an aftermarket ECU, i rlly dont kno much about them tho as i havnet looked into it, but my understanding was id need one that can run alost entirely off the TPS in order for it to work with quad throttles


Dave

[chris davey]

I think any decent ecu can tune based off TPS rather than load. I know the wolf and microtechs can.

[Toysrme]

+ shipping + insurance + customs / duties

which is the problem with getting these things etc

And he's not going to pay shipping & such on ordering for a catoluge?
I've bought & sold several things out of Australia & never encountered anyone paying duties either way. 1 week air poriority for such an item would only cost about $15.

[gearb0x]

And he's not going to pay shipping & such on ordering for a catoluge?
I've bought & sold several things out of Australia & never encountered anyone paying duties either way. 1 week air poriority for such an item would only cost about $15.

In aust if the declared value is over 1000$ on ANY incoming goods u cant have them till you pay 10% GST + 5% Customs duty

I just got hit for it on some motorbike parts

[gearb0x]

Oh and if u split the packages in 2 to get around it... send them like a week apart!

[off-road]

In aust if the declared value is over 1000$ on ANY incoming goods u cant have them till you pay 10% GST + 5% Customs duty

I just got hit for it on some motorbike parts

If the docket says goods are made in the USA there is no duty to pay regardless of value. Aa already mentioned if it is over $1000 you will pay GST and processing fees which blow costs out.