Hey guys... I'm a turbo guy and don't know whole lot about your NT cars... but I have a suggestion anyway. If you see that your a/f ratio is too rich you can lean it out by opening up the unmetered section of your MAF. Looking at your MAF there are 2 tubes that make up the unmetered section... and one of those tubes it closed at the end. To allow more air through the unmetered section just drill a hole in the plasic at the end of the closed tube (to open it up a bit). Then go check you a/f ratio and if it's still not good enough drill the hole larger. What this will do is allow more air to enter the system then the ECU knows is there so it will lean out your a/f ratio at wot.

BUT... there is a catch... after allowing a certain amount of air divert from the metered section into the unmetered section there will be not enough air to maitain a proper idle going through the metered section. This is a fine line... your idle will be fine up to this point and then crappy after it. But I think it would be real easy to just plug the hole again if you have this problem... or even partially plug it. Or if you want to get creative have a little flapper door installed that will plug it at idle and then swing out of the way under the increased airflow of wot.

I have never done this to an NT car before but I use all the same priciples in ym MAF mod for turbo guys. It might be worth experimenting with.

Later...

------------------
Mike J

-Quadcylla-
92 Laser RS-T, FWD

Vortex Racing
http://www3.sympatico.ca/robin.jackson2/HomePage.htm

Hello again, Mike.

Both tubes were wide opend on my 1991 2.0L NT Laser RS. I did removed them last summer... Also I did not get that bad of a idle after the removal. Just had to lower the RPM a bit.

Maybe this plug tube configuration is on the 1.8L???

Ghislain.

Hhhmmm... I got the MAF I'm refering to off a 90 NT but I don't know if it was 1.8 or 2.0. Oh well.

------------------
Mike J

-Quadcylla-
92 Laser RS-T, FWD

Vortex Racing
http://www3.sympatico.ca/robin.jackson2/HomePage.htm

The idle was not affected. Got to admit it was not picture perfect before the mod but it did not get worst after the mod. The idle is at 750. It does not wonder but the engine vibrate a bit at idle I'll probably increase it to 850 were it should stabilize a bit.

I'll be puting on a set of headers soon, probably next month. I will be doing some porting, just a little bit, mainly cleaning the ridges and smoothing it the port. I got good compression on all 4.

Do you think that a mild port job will affect the idle. To be honest with you I'm not that consern if the idle is a little rough, as soon as it does not wonder and that the shakes are not too bad. I did notice a bit more vib after I filled a mount (The one between the rad and the motor). I guess it's normal since it's stiffer, had to do it cause the mount was toasted...

BTW; I got two motor mount for sale. They are from a 1991 Talon TSI AWD. Got them through an add in the parts traider but the one I needed does not fit the NT FWD...
They are in good shape, one has a little bit of craking, it is the front one (Timing belt side).

For the lean condition;

It was mainly at lower RPM in close loop. It was fine at WOT. This is why I did removed the vacuum line to the fuel pressure regulator. It did cure the lean condition by adding more fuel pressure in the fuel rail. After this the engine was running the same Air/Fuel mix as before the MAF mod.

Have a look at this page, it is what I did; http://www.lks.net/~ghislisa/DSMMod.htm
Under "Mass Airflow Sensor".

Ghislain



[This message has been edited by Ghislain (edited March 02, 2000).]

that must've been a 1.8L MAF because I had mine out today (92 2.0L) and both tubes are open

I removed both tubes in mine, 91 NT 2.0.

Drilled out a plastic rivet, i think there were 3? The idle was pretty rough, and I think it stalled a couple times, so i re-attatched the tubes with a small nut+bolt through one of the rivet holes. Never thought about adjusting the BISS screw at the time...that probably would have gotten rid of the rough idle.

I run this set-up in the summer time. Just have to remove the vacuum line to the FPR and to adjust the idle. For sure it affect the idle a little bit but WTF.

I'll reajust the value of the themp sensor with a 10k pot. Hopefully this will allow me to reinstal the vacuum line. I will post the results. Should be sometime in mid april. After the instalation of the headers, porting and polishing of the head.

Ghislain.

its not the 1.8L MAF either i had mine out a month ago and both tubes are open to.

------------------
1993 Eagle Talon DL 1.8L
Beats Walkin'
§TOKE§
icq 37160225

I wonder where that MAS came from? (Mike, maybe it was from a SONATA

You got me... the guy I got it from said it was from a 90 NT I believe... I deleted the email a while age (D'OH!). Oh well I posted the question to the digest to see if anyone there knows.

Later....

------------------
Mike J

-Quadcylla-
92 Laser RS-T, FWD

Vortex Racing
http://www3.sympatico.ca/robin.jackson2/HomePage.htm
Alt Email: vortexracing@hotmail.com

Yes I saw your post on the digest. I can't wait to see the ansewer you get as I'm also curious to see what vehicle it belong to.

Ghislain.