Ka24e MAF question

[normaspirated]

I just came back from the junkyard and got a KA24E maf with connector. I saw that there's a sensor on the stock airbox which connects to a harness, which is wrapped up along with the 3-pin sensor wires. I just used a wire cutter to cut off that extra sensor. So basically, all I have is the maf and the connector with 3 wires representing each pin. Did I need that extra sensor? I have this weird feeling I don't, but I just wanted to make sure.

[Nunook]

It was an air temp sensor. Not needed on the ca, but i thought about trying to use it to measure the temp of the air coming out of the intercooler?

[float_6969]

Just as Nunook said. It's not needed. If you'd like, here is the reason that it is there...

When they first stared producing the S13 with the KA24E in 88' (sold as an 89' model year) They actually came with lower compression pistons than what most of the S13 KA-E's came with. During that time they used a simpler version of their ECCS system to control the engine functions. The problem was that later that year the US started imposing regulations regarding emmisions and such. Because of this, Nissan had to start using things like the EGR, AIV, ect.. These items cause the power to drop, so Nissan had to increase the compression and more closely monitor the A/F to get the same power out of the motor. This is the reason for the intake temperature sensor on MOST of the KA-E airboxes.

Nunook, it would be possible to do this, but would require some minor cutting of the intercooler piping. You would also have to find out what the resistance:temperature ratio is, but that could be easily found in a 90' FSM for the S13. The hard part would be to devise some sort of computer that would be able to sense the resistance, convert that resistance to a temperature value based on the graph in the FSM, and then display that temperature.

[normaspirated]

Ahhh..I see. Thanks guys.

[float_6969]

No prob. I like spouting about that worthless Nissan history. It makes me feel smart! Hehheeh

[biosehnsucht]

Actually first few months of '89 production were higher comp, but they were having issues with people complaining about knock etc so they reduce the compression (but somehow made the same official power figures), and added the air temp sensor. for the' 90 model year we went back to high comp and added a knock sensor, in addition to the air temp sensor etc.

[normaspirated]

Two more questions:

-Is there a reason why the KA24DE maf can't be used? I mean, is it really just an ecu issue? Like, the ecu won't read the maf correctly, or it just won't read it at all?

-When doing the wiring for the maf, are there only three wires used when combining the ca18 harness with the ka24 harness? 'Cause I plan on reusing my stock KA24DE harness (with the ca18 wired to it, of course) and I'm assuming the ka24de maf harness has four wires while the ca18 has three?
Modified by normaspirated at 9:22 AM 11/4/2004

[float_6969]

Actually first few months of '89 production were higher comp, but they were having issues with people complaining about knock etc so they reduce the compression (but somehow made the same official power figures), and added the air temp sensor. for the' 90 model year we went back to high comp and added a knock sensor, in addition to the air temp sensor etc.

I stand corrected.....

[slideways]

OK, so does it work or not? can you use it w/o retune or not and if so did u feel a difference, there here say gets annoying, someone please show the facts. geezee

brandon

[float_6969]

There are quite a few people on here who are using the KA-E MAFS w/o problem. No ecu retune or piggy back is nessicary as they are almost exactly the same size. Please be a little more patient and keep the "here say" and "geezee" comments to a minium. Thank you.

[WeldingHank]

happy KA-E MAF user here. been using it since day 1.

[float_6969]

Thanks Hank!