KA24DE vs SR20DET MAFS Question

[AadosX]

Ok I freaking searched, but I really think a lot of people don't know what's going on here. Anyways here's my question. I didn't install the engine, a shop did, and fucked it up. I'm like 50% through re-installing the entire thing lol, and getting it all working. Today I decided to give the MAFS a shot. I'm running a little rich, crappy gas milage, and the car doesn't want to start. So I thought it wouldn't hurt to replace the MAFS. BTW It's an S13 SR20DET in an S14 chassis. Ok so I buy an SR20DET MAFS, (I think, can you confirm?... it says 9612 On it in the little box and has ABC only) here is a picture:

http://www.auburn.edu/~lockejc/other/sr20det1.jpg
http://www.auburn.edu/~lockejc/other/sr20det2.jpg

It has three prongs ONLY in the place for a plug.

I go outside and start taking off the old MAFS. Well, they ghetto taped the plug on there, and upon further inspection, it's some sort of MAFS with 4 prongs, but one of the prongs is just ripped off, so now there are only three. It also has a four prong plug, but one of the prong female ends is ripped off as well. Then I looked harder and see that there is a new plug soldered to my harness too. I'm thinking maybe it's a KA24E MAFS, it says 2215 on it, and has ABCD written near the prongs? Does anyone know if this is what it looks like?

http://www.auburn.edu/~lockejc/other/ka24e1.jpg
http://www.auburn.edu/~lockejc/other/ka24e2.jpg

Other than that confirmation, now I need a SR20DET MAFS plug, where the heck can I get that? Thanks!

[mistaanime]

kay..the mafs should be the same as the 89-90 240sx, i believe. and if they didn't install it rite..y don't you bring it back? really..getting it installed isn't cheap..you mite as well gimmie the money for labor and i will juss do a shitty job and let you re install it..

[AadosX]

Um I don't get what you're saying about the MAFS... I know the KA24E MAFS is out of the 89-90 240SX... I'm trying to find out.

1) Is the first pictured MAFS the one from the SR20DET.
2) Is the second pictured MAFS from the KA24E.
3) Where can I get an SR20DET MAFS Plug/Wiring Harness.

And like I said, everyone on this board it seems says "they're the exact same..." Well, I don't think so... if those pictures are of the MAFS that I think they are, then they are NOT the same. The actual body of the MAFS is the same, but the harness, plug, prongs, readings are DIFFERENT.

EDIT: Now I get what you're saying... you believe that the SR20DET MAFS and the KA24E MAFS are the same. Yeah, a lot of people do, I'm looking for someone who actually owns them so I can find out FOR SURE. Thanks though for the reply. BTW, don't worry about the money, I paid $700 for the engine install, $500 for the auto/manual tranny swap, and now I have gotten $500 of that back... but that doesn't really matter anyways right now. I'm just trying to get the car working.

[turboex]

are you running electric fans? If so turn them off and driv the car, see if it runs better. Just try it. Fans can blow into maf, or move tons of air in engine bay thus giving bad readings to the maf and causing bad idle, running and poor gas milage.

[AadosX]

It's not that because I just installed my fans like a two weeks ago, and the car is still as it's always been. Dangit... can't someone just go look at their MAFS and answer my question lol.

[steve shadows]

It's not that because I just installed my fans like a two weeks ago, and the car is still as it's always been. Dangit... can't someone just go look at their MAFS and answer my question lol.

search on Freshalloy.com i did a write up on this before over there. :ghey: :bash:

-steve

chow down kids

[AadosX]

Maybe a link or some good terms to use? Did you use MAFS or MAF? SR or SR20DET? That search engine blows, combined with the fact that most people use all kinds of weird terms... it takes forever. I just went through over 20 pages of your recent posts... and found nothing. sigh.

[ace240sx]

The maf that was all jimmy rigged is the newer ka24de maf that has abcd 4 wires. the sr and ka24de both are the same but have different plugs.

[AadosX]

Thanks, so would having the KA24DE MAF on there really really screw up my car?

[ace240sx]

It wouldn't damage anything, but it would run like shit if it even ran at all.

[justeno_heat]

Ok, I can tell you exactly what you need to know. The SOHC MAFS has 3 prongs on it with a small sensor top than the SR20's. The DOHC Ka's have 4 prongs on them, with a bigger sensor top. The SR20's have 3 prongs on them with the same size sensor top as the Ka's do. Now the harness plug you have is correct. What you are using is the SOHC MAFS. You need to buy an SR20 MAFS. You can usally find them on ebay for around 20-30 dollars.

[Muzzy]

u cant used a KA24DE MAF...its wont be able to handle that much air flow. plus the extra prong.

[ace240sx]

actually the ka24de has the same diamater inlet, the real reason it cannot be used is because it has a different voltage resolution than the ka24e and sr20det use. Meaning at the same airflow intake the ka24de maf will read a different value than the sr20det/ka24e, which makes your car run like crap.

[nightwalker]

fools! S13 redtop SR, and S13 KA (DOHC) use the same exact maf. It's a 4 pin plug. The SOHC maf is only three pins, and will not work...without some modification.

[Muzzy]

ahaha...crackhead bitch...you're off your fukin rocker!!! if the SR maf and KA24DE maf were the same there would be no need to run a hacked MAF on a KA+T correct?? everyone i know with an SR has 3 wires on the maf kook

ace is correct though.

[AadosX]

Ahh I'm going to go crazy here... lol. Ok all I know FOR SURE for now is:

1) The MAFS that I bought, which is 3 prong, is the KA24E MAFS. It's part number is 22680 40F00. It is three prong with a three prong sized plug, and says ABC on the top.

And that's about it. Will it work perfectly? I'm assuming that I need to go find a plug to use with it... because the plug on the car right now is a 4 prong plug, but only three of the prongs are utilized (see picture above). Either way, will it make my car run rich at all or is it THE EXACT SAME as the SR20DET MAFS?

Hrmm, also, I just saw this auction. It shows a supposid SR MAFS, with three prongs, but it looks like ABCD written on the top, ... sigh I'm so confused.

It looks like Justeno Heat is right... maybe the SR MAFS has ABCD written on it, but still only has three prongs... while still using a seemingly 4 prong plug, but with only three utilized female holes, possibly, and much like the plug in my first picture above. Then the KA24E MAFS has three prongs, but only has ABC written on it... therefore a smaller three female (all holes used) hole plug. I also found a picture of the KA24DE MAFS, or at least I think that's what this is...

http://i16.ebayimg.com/03/i/01/b2/99/a8_1_b.JPG

So this tells me that what is in the car IS NOT the KA24DE MAFS. I'm starting to think that my car might actually have the correct MAFS lol. The part number is 22680 52F00. Yeah, after some more research I think that this IS IN FACT the correct MAFS. Now, I just don't know if the plug is correct or what the deal is. As you can see in the picture, the plug is a 4 prong plug, and the plastic on the MAFSA that it plugs onto is non-existent. Does that look like the correct plug? Someone with my engine please tell me. Thanks!

[AadosX]

Ok, in case that didnt' make sense, and in reply to you guys posts.

Nightwalker: You are half correct... The KA24DE and the SR20DET both use a 4 pin plug, but on the SR it's not actually a 4 pin plug... it just the same size, but only uses 3 pins, and three wires. The SOHC KA24E is only a three pin housing, so it's smaller, but those three pins are all you really need. This is why the KA24E MAFS will work on the SR engine. The 'modification' needed is grabbing the KA24E's plug too, and wiring it to the engine wiring harness, so that you can use its snap on plug. It's still three wires to three wires... but you're using a smaller plug so that it will actually plug onto the KA24E MAFS, because the SR plug is bigger, even though its still only three prong.

Justeno was kinda right... but he just needs to type more clearly.

Ace was right, except when he tried to say that the ghetto MAFS in my car is the KA24DE one. You see, both the KA24DE and the SR20DET MAFS have ABCD written on top of them, but for some reason, the SR MAFS only uses 3 prongs, ABC. WTF is wrong with Nissan.

Someone please correct me if I'm wrong... but I don't think I am.

[nightwalker]

KA24E is small plug, with three connectors, and three wires.
KA24DE is wider plug, with four connectors, and three wires.
(S13)SR20DET is wider plug with four connectors, and three wires.

I know for sure because I have a KA24DE, and four of my friends have S13 SRs. I have spent time helping them with the swaps. There was a particular situation where I pulled the MAF from my friend's SR and plugged it into my car to see if my smoking problem was the MAF. It plugged right up, no problems, and my car ran like a champ. Then I got a new MAF from the junkyard, and I gave him his MAF back.

Someone may have ghetto rigged your harness, (did you do the swap yourself?) because I know that the KA24E maf can be made to work with the DE and SR motors with modifications. Check the harness.

[ace240sx]

Ya AadosX nailed it, here is a little story. When I first started up my sr it would run then warrble between 1200 rpm and 200 rpm, and eventually stall. This was when I was using the jdm sr20det maf, so I was pissed off. Then I got the ka24e maf off the guy i sold my old motor to and I spliced the 3 pin ka24e maf plug onto my harness and then pluged it in. Now my car runs like a champ. Moral of the story is that if you are using the jdm maf it could be bunk, just like mine was. Another way you can check is turn your key 3 clicks, and measure the voltage across the black/white and black wire(should read +12 V). Then measure the voltage across the white and black wire(should be 0 V). Now start the car and do same measurements, but at idle the white wire should have .08 to .24 volts if it is higher your maf is screwed. My sr20det maf was reading 1.6 V at idle LOL thats like almost 1/4 of the maximum flow the maf can handle.