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-   Porsche 924/944/968 Technical Forum (http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/)
-   -   tuning a 944NA with an Abaco sensor (http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/757422-tuning-944na-abaco-sensor.html)

ritter4242 06-27-2013 07:13 PM

Well all I've done is the vacuum lines, and I don't really think that'll do much! is there a kit or something that is recommended for the NA?

ritter4242 08-03-2013 05:32 PM

Alright gents, so this is whats going on, so I think its too lean all the way up? the afr isn't consistent. Do I need to let it run for a bit before I start making measurements

20130803 184721 - YouTube

nynor 08-03-2013 07:59 PM

yeah, that 18.0 is bad. i'd probably want to be seeing numbers around 13.7 for normal driving and lower for hard acceleration. you are going to melt something, if you keep running it that lean.

ritter4242 08-03-2013 08:01 PM

fuuuuuuuuuuuck.... well I'm glad I'm not driving it anymore... I have plenty of time tomorrow to fiddle with it

nynor 08-03-2013 08:01 PM

when you let off the throttle, you will see the numbers climb, that is because the engine is still turning fast, but you aren't on the throttle to give it gas. this is normal.

those numbers above 15 when hitting the throttle are not normal.

is the MAF supposed to have an O2 sensor input?

ritter4242 08-03-2013 08:02 PM

nope! its an abaco, part of the problem is it doesn't pump out enough volts, so I'm going to have to screw out the plastic bolt behind the pedal to stop it from over opening .. so 14s at idle, and 12's at wot,15s on close?

ritter4242 08-03-2013 08:04 PM

I plan on doing an AEM EMS... but I don't have the money or the time, and kinda want the experience

nynor 08-03-2013 08:05 PM

this could be a fuel delivery problem, also. i'd be for checking the fuel pump, per the instructions on clarks garage Clark's Garage Home Page. if that checks out, i'd check the injectors, especially if they sat for that long. if that all checks out, THEN i'd start playing with the tune on the MAF.

nynor 08-03-2013 08:07 PM

Quote:

Originally Posted by ritter4242 (Post 7584281)
nope! its an abaco, part of the problem is it doesn't pump out enough volts, so I'm going to have to screw out the plastic bolt behind the pedal to stop it from over opening .. so 14s at idle, and 12's at wot,15s on close?

enough volts for what? an O2 sensor provides the voltage to give the MAF a signal. i bet the wideband you have can send the same signal. i know mine can, as i have to hook it up for emissions.

Quote:

Originally Posted by ritter4242 (Post 7584283)
I plan on doing an AEM EMS... but I don't have the money or the time, and kinda want the experience

AEM EMS? not sure what that is.

edit: i googled it. engine management system.

what is it that you think you are going to get out of this, over the stock AFM?

ritter4242 08-03-2013 08:07 PM

hmmmm

well i'll have to give it a looksie, been looking for a reason to upgrade to Lindsey racing hardware :D

ritter4242 08-03-2013 08:12 PM

well the MAF is giving me faster revs when it works, and volts as in the MAF isn't giving the same range the AFM. its only like 5 volts and its supposed to give 6 or something. so I could program the EMS to understand the MAF and get a better running car.

The AFM provides a TON of resistance to the system.

nynor 08-03-2013 08:15 PM

oh, and on deceleration, that number will climb. hard deceleration, going downhill with no throttle, for example, it will probably be 17 or higher.

ritter4242 08-03-2013 08:16 PM

ok, I won't worry about the numbers when decelerating :)

nynor 08-03-2013 08:16 PM

it is supposed to give six volts, but lindsey racing sold it to work on your 944? i find that confusing.

nynor 08-03-2013 08:20 PM

Quote:

Originally Posted by ritter4242 (Post 7584297)
ok, I won't worry about the numbers when decelerating :)

right. my wideband maxes out when decelerating hard. >17 for sure.

ritter4242 08-03-2013 08:24 PM

I got the sensor from Lindsey, I knew it wasn't plug and play, part of the problem is the DME requires Xvolts and the sensor give Yvolts, that difference meaning I can't hit WOT completely. I want to upgrade my fuel system to lindseys rails. the MAF is ment to be used on heavily modded cars. like 951's

nynor 08-03-2013 08:32 PM

is the MAF for later 944's and yours is an early?

ritter4242 08-03-2013 08:35 PM

the maf is universal, theres the problem...

nynor 08-03-2013 08:37 PM

yes, but is yours an early DME? maybe it would work with a late DME. IIRC, the early DME is expecting 8V from the AFM. let me research that for a minute.

ritter4242 08-03-2013 08:39 PM

yes its early, they both require the 'wrong voltage' and the sensor is ment to be set up with a custom DME/EMS


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