1.8t Narrowband to wideband conversion

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The Snail
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1.8t Narrowband to wideband conversion

Post by The Snail »

Howsit guys!

I have a 1.8t AGU, loooong story behind the thing...busy with BT build at the moment, and eventually going to need a custom tune! Anyways, I have done way to much research on the narrowband ecu's, especially with regards to tuning them etc.

Being a wana-bee electrical engineer, I have designed a couple things, Mainly electronic boost controllers...At the moment Im actually waiting for my car to run again so i can test my new closed loop electronic boost controller! Will be able to adjust the boost according to throttle position and RPM, to get rid of that awful jerk that normal boost controllers make lol it has a lcd, that displays actual boost, target boost, peak boost and duty cycle...i put the duty cycle on so it will help to tell if there are boost leaks or similar problems...and last but not least, boost by gear! One day when im done with it il post it up!

Ok moving on to the main subject....I am (99% certain) that I can build a device to make a narrowband ecu, 'wideband'...By using a wideband lambda controller (LC-1 to be specific as it has analog outputs), map sensor and obviously my simple controller to 'alter' the MAF signal for the fuelling..Thereby being able to control the fuelling over the whole rpm range. Obviously some other piggyback device will then be needed to control the timing maps etc.

So my question, would it be worth it? Wont it work? Any advice? Hopefully im explaining clear enough, if not then just ask away!

Thanks guys!
ex. Golf 4 GTi AGU/AUQ

t3/t4 50 trim .48ar
260kW and 390nm
Eurodyne maestro software

Audi 3.2 vr6 Turbo
323Kw and 660nm @ 0.7 bar
Digit Riaan
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Re: 1.8t Narrowband to wideband conversion

Post by Digit Riaan »

His: '05 WRX STi, '98 356 Speedster Rep, '76 Dodge D100, '79 Golf LS
The Snail
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Re: 1.8t Narrowband to wideband conversion

Post by The Snail »

Thanks for the replies guys!

@ Porno_ster, that narrowband to wideband conversion is not for the drive by cable cars...only drive by wire.

I really wanted to change to the me7.5 for all the obvious reasons, but its really not as simple as putting in a new ecu and wiring loom. Other items are needed, as well as many headaches lol it works out very pricey as well!

Look this is pretty much how i saw it...Many AGU guys go the route of unichip, or even standalone. The unichip alters the MAF signal for fueling, but has no idea whether the car is actually running rich or lean. So i want to come along with a wideband kit, and actually alter the MAF signal to maintain a certain AFR over the whole load range, and easily incorporate a safety function to cut boost in a lean condition.

So basically....

---> Controller reads Current AFR
---> Controller reads Current Boost
---> Controller reads Target AFR for Current Boost
---> Controller alters MAF signal to ECU until Target AFR is reached for Current Boost

Obviously as the MAF signal is being altered, the timing MAPs will jump around, which the unichip then takes care of.

If you think im being dumb then just stop me right here before i go blow up my car lol.

Thanks again for the feedback!
ex. Golf 4 GTi AGU/AUQ

t3/t4 50 trim .48ar
260kW and 390nm
Eurodyne maestro software

Audi 3.2 vr6 Turbo
323Kw and 660nm @ 0.7 bar
The Snail
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Re: 1.8t Narrowband to wideband conversion

Post by The Snail »

Oh sorry and as for the Apexi SAFC II, I checked it out and it seems like it only adjusts the MAF according to different RPM's, thats quite useless for a turbo charged car in my opinion...Maybe i missed the control via boost?
ex. Golf 4 GTi AGU/AUQ

t3/t4 50 trim .48ar
260kW and 390nm
Eurodyne maestro software

Audi 3.2 vr6 Turbo
323Kw and 660nm @ 0.7 bar
HASSEN
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Re: 1.8t Narrowband to wideband conversion

Post by HASSEN »

Hi mate
Go for it. I also have an AGU and would be interested in something like this.
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Killerwatt
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Re: 1.8t Narrowband to wideband conversion

Post by Killerwatt »

It can work for sure. But what do you gain over just a proper tune on the stock ecu?
Just a thought, but have you looked into adding a fifth injector to add more fuel?
For me the me7 swap will be your best bet. But if you are able to use a microcontroler based system to tweak the stock ecu then go for it. But just be weary of reinventing the wheel.
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Taz0
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Re: 1.8t Narrowband to wideband conversion

Post by Taz0 »

Killerwatt wrote:It can work for sure. But what do you gain over just a proper tune on the stock ecu?
Just a thought, but have you looked into adding a fifth injector to add more fuel?
For me the me7 swap will be your best bet. But if you are able to use a microcontroler based system to tweak the stock ecu then go for it. But just be weary of reinventing the wheel.
:iagree:
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The Snail
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Re: 1.8t Narrowband to wideband conversion

Post by The Snail »

Thanks for the replies again!

@ Killerwatt, thats why im asking you guys :D Would the car benefit performance wise having a closed loop system? Other than the protection side of it? and Ive also never heard of the 5th injector setup? But thanks I'll google it! Im really not trying to reinvent the wheel, im going to be buying a wideband kit to monitor the car anyway, the rest of the parts that i need for the controller i already have...Was just hoping something great could have come from it! Worst case il just make a protection unit out of it, completely cut the boost if the car has a lean condition under a certain load...

@ Gizmo, what if my fuel filter blocks, or pump dies (which it did :bang: ), or injectors get dirty or some type of nonsense, same story...all the engine has to rely on then is some timing retard lol but yes it will also be risky!

Anyways I guess the main thing that i would like to know, will there be any performance increase? If not, then its not worth it..I'll go all out protection for us AGU's :hurray:

Shot guys!
ex. Golf 4 GTi AGU/AUQ

t3/t4 50 trim .48ar
260kW and 390nm
Eurodyne maestro software

Audi 3.2 vr6 Turbo
323Kw and 660nm @ 0.7 bar
Shellyboyg4
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Re: 1.8t Narrowband to wideband conversion

Post by Shellyboyg4 »

How far did you get with this?
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