s13 mafs hacking

[nikn]

so i cant hack a 1990 240sx maf can i? y not??? What alternatives do u guys suggest

[nikn]

anyone?

[tapdeznutz]

patience. maybe WD come to the rescue

[WDRacing]

The MAF's are different. I was just talking to Orion about this same topic. If it was a simple HotWire type then it would be easy. I'm still working on idea's. I actually think I have the problem solved, I just need to try it out when I get back. Patience my friend...

WD

[ftrs13]

I was just thinking while reading this post of an option that might work.

Ive been pondering this question for a while, cause I also have a sohc that I though about this option on.

Im not sure how exactly the MAF works, but couldnt you add a resistor to the path of the wires, as long as it sends an electrical signal.

I know that you would max out the airflow at the same point as a regular one, but that would allow you to use 370cc injectors, as long as you matched the resistace to change the message going to the ECU so that it thought the air flow was that much smaller.

what does everyone think about this

Steve

[nikn]

thanks guys... i just dont see how it could be different from hacking a s14 maf, or any other MAF for that matter.

[Nathan]

Because it's such a different construction...

[WDRacing]

The internals of the S13 MAF are different from the S14 MAF, thats how. Give it a try though. Let us know what happens.

WD

[MidnightSlide]

I had an idea the other day... I see these "power mods" on ebay that supposedly add a resistor to your mafs that makes your timing advance and all that....

couldn't you just add the opposite to make the timing retard and make it more turbo friendly?

[tapdeznutz]

i tried one of those resistor things. it just plugs into one of the plugs right before the throttle. basicly it made my sohc run rich. theirs more to it but thats the basics.

[tapdeznutz]

and the claimed power gains, i dont know about that. wasted lots of gas yes. increased power dont sure

[nikn]

i'll take a look at the car some time soon....

[nikn]

is the s13 maf a hotwire or karmen vortex

[TopStreet240]

hotwire, or at least on the sohc. I did a 3 inch afm and it works fine. Just by doing some math i was able to use a 3 inch afm and 550cc injectors then a S-AFC to tune out the little quirks.

[WDRacing]

Hey TS, is the MAF the same between the E and the DE on the S13 model??

WD

[Nathan]

The DE S13 is a hotwire as well, but it's funkified.

[ftrs13]

topstreet,

you used a different MAF? how did you change your setup to accomodate it.? does it give the same signal as the sohc MAF??

thanks,Steve

[TopStreet240]

no no no... i used the sohc maf, i just opened the whole pipe up 3inchs so that more air could flow in. Its a hotwire system so its only going to read 1 to 5 volts, we just expanded the whole maf/afm so that when it sees 5 volts it is just seeing more air.

[TopStreet240]

Hey TS, is the MAF the same between the E and the DE on the S13 model??

WD

thanks wd, i actually didnt know that. do you know, do they use the same Air flow meter and everything or is it bigger???

[TopStreet240]

oh.... sorry i miss read you, im actually not sure if they are the same

[WDRacing]

Heh...thats cool. I have another idea, instead of opening up the MAF to a specific size, you could add an air supply aft of the MAF. Somthing like another tube with a filter installed on the end. Preferable pulling air from the area as the normal filter, so its getting the same temp air and any other variables. I'll probably mess with this throey when I get back. Seems pretty straight forward though. Same principles as the hacked MAF.

WD

[TopStreet240]

cool man good luck with that and tell me how it works, i have not had a problem with the AFM yet, but am interested in seeing some other ideas.

[ftrs13]

did you just hollow out the current MAF, or add a different pipe like the s14

cant wait to get my turbo installed, thanks guys

Steve

[TopStreet240]

I used a whole new pipe, and made a bracket to house the mafs... then welded it in so that i had a true 3inch afm.

[ftrs13]

I didnt know that you could do that with the sohc, I may give it a try

Thanks

Steve

[TopStreet240]

i will post some pics of it... its dark and raining right now. Tomorrow i will take some shots and show you what im talking about.

[240driver39]

very interested to see pics of this...

[TopStreet240]

here are some pics, they are on the car and when i get some time i will take it off and show you the whole thing. but i hope you can all get the idea.

[TopStreet240]

here is another

[TopStreet240]

and one more