What modern EFI is everybody using, Modern EFI applications on Type-IV engine Options

[TheWeatherMan]

What modern EFI systems is everyone installing on their Type-IV engine?

[Mark Henry]

I installed SDS way back in 2004, still running the same system in my bug but I re-chipped it to the latest version before V5.
Likely I'm one of the first here running a programmable FI system, at least on a DD.

http://www.sdsefi.com/

My 914 I ran it on a stock 1.8 and 2.0 with a mild carb cam with a pretty well stock D-jet intake (intake used on both the 1.8 and 2.0). Both engines ran flawless, perfect AFR, on the 2.0 I took the programmer off and ran it for 3 years (6+ month seasons) without ever checking it. I'd say it ran like a brand new L-jet, turn the key and go.

My bug is a super hi-performance 2.6L T4, 102x78mm, nickies, JE's, 2.0 big valve heads, Web cam, A1 1-3/4 exhaust etc, etc...
Only issue is because of the 46mm ITB's I can't get a good MAP signal and I have to run it as a TPS only system which may hurt my MPG slightly.
But then again it still runs flawless even on TPS.

I can tell you for 100% sure PEFI doesn't add a single HP, but it can run things, like a performance cam, that stock FI can never run.

[JamesM]

PEFI alone adds no HP, but a proper tune on top of that PEFI will, especially if your system is controlling your timing as well. Having a full 3 dimensional tuning table for both fuel and spark allows you to dial in the tune and give the engine exactly what it needs everywhere.

I installed SDS way back in 2004, still running the same system in my bug but I re-chipped it to the latest version before V5.
Likely I'm one of the first here running a programmable FI system, at least on a DD.

http://www.sdsefi.com/

My 914 I ran it on a stock 1.8 and 2.0 with a mild carb cam with a pretty well stock D-jet intake (intake used on both the 1.8 and 2.0). Both engines ran flawless, perfect AFR, on the 2.0 I took the programmer off and ran it for 3 years (6+ month seasons) without ever checking it. I'd say it ran like a brand new L-jet, turn the key and go.

My bug is a super hi-performance 2.6L T4, 102x78mm, nickies, JE's, 2.0 big valve heads, Web cam, A1 1-3/4 exhaust etc, etc...
Only issue is because of the 46mm ITB's I can't get a good MAP signal and I have to run it as a TPS only system which may hurt my MPG slightly.
But then again it still runs flawless even on TPS.

I can tell you for 100% sure PEFI doesn't add a single HP, but it can run things, like a performance cam, that stock FI can never run.

[Mark Henry]

PEFI alone adds no HP, but a proper tune on top of that PEFI will, especially if your system is controlling your timing as well. Having a full 3 dimensional tuning table for both fuel and spark allows you to dial in the tune and give the engine exactly what it needs everywhere.

Marketing Koolaid (IMG:style_emoticons/default/biggrin.gif)

3D tuning table? does that help if you drive inverted?
Sequential helps with fuel economy, for the most part below 3000 rpm where the T4 and /6 aircooleds shouldn't be running anyways.
I'm running TPS only and my AFR is as solid as a rock through all RPM's

3D spark map (IMG:style_emoticons/default/lol-2.gif) A spark map is about as simple as simple gets. Once you have spark control the dark art of the dizzy curve goes bye-bye. (IMG:style_emoticons/default/bye1.gif)

Proper sized and tune Webers still win at WOT. (IMG:style_emoticons/default/shades.gif)

[JamesM]

Marketing Koolaid (IMG:style_emoticons/default/biggrin.gif)

3D tuning table? does that help if you drive inverted?

Maybe if you are comparing to carbs (IMG:style_emoticons/default/tongue.gif) but it does allow you to tune more accurately vs systems that follow an analog curve to approximate fuel requirements at given engine conditions see: Carbs, D-jet

Sequential helps with fuel economy, for the most part below 3000 rpm where the T4 and /6 aircooleds shouldn't be running anyways.
I'm running TPS only and my AFR is as solid as a rock through all RPM's

Totally agree, sequential is a waste of time and adds needless complexity

3D spark map (IMG:style_emoticons/default/lol-2.gif) A spark map is about as simple as simple gets. Once you have spark control the dark art of the dizzy curve goes bye-bye. (IMG:style_emoticons/default/bye1.gif)

Digital spark control is way more accurate/consistant than a dizzy at least all the type 4 dizzys i have played with. If you are only playing with an ignition curve in two dimensions (RPM + deg advance) you cannot optimize for all running conditions, 3 dimensions (RPM + engine load + advance) allows for this.

Proper sized and tune Webers still win at WOT. (IMG:style_emoticons/default/shades.gif)

I attempted an autocross run entirely at WOT, turnes out other throttle positions are useful. (IMG:style_emoticons/default/smile.gif)

Nothing against carbs, they are just not my thing.