KA24E MAF Gets Dodgey At More Than Stock Boost?

[rico05]

Talking to a buddy of mine earlier and he is having issues with his MAF (KA24E MAF on SR). He siad the he heard that the KA MAF goes to poo at more than stock boost. Anyone have a comment?

[float_6969]

I've never heard that, but I don't have any experience with it either. I also wouldn't be suprised. Stock HP on a KA-E is only 145hp. Stock HP on a redtop SR is about 205hp (thats close anyway). Thats a good 60hp more than it was designed for.

[rico05]

Well, I guess I am asking because I have a KAE MAF on my CA and I am having fuel issues (as in getting too much) so I was wondering about this.

[float_6969]

I suppose that could be a problem. If you had to MAFS, one larger, one smaller, and flowed the same amount of air through them, the smaller MAFS would read a higher voltage than the larger one. If the computer was getting a falsely high voltage reading it would add the appropriate amount of fuel, but if enough air wasn't present to burn that fuel, you now have a rich condition. And since the computer is going to trust the reading from the MAFS before it trusts the reading from the O2 sensor, it will continue to run rich not only because of the reading from the MAFS, but also because it would think that the O2 sensor was bad and run it rich to be safe. This is all specuation of course and just reasoning. I don't KNOW that the KA-E MAFS is smaller. I was under the impression that they were the same size....

[WeldingHank]

the KAE MAF is only slightly larger than the CA18 maf. about 1/8th inch.

[float_6969]

So with that info the car should actually run slightly lean. Sorry rico, blew my theory out of the water. Are you sure you don't have some aftermarket ecu or anything>

[rico05]

Don't think so. There are no stickers on it and it is not socketed so I assume it is stock.

[float_6969]

Hmmm. How rich are we talking about? Is it rich all the time?

[NeedCAforS13]

rico, your ARC bov is causing your richness. no joke. its designed to be re-circulated, so it leaks some at idle. It also goes rich when you shift. just tie it back into the intake pipe and run it recirculated. I bet that'll solve alot of your problems

Sean

[rico05]

How? The vac port on my turbo inlet duct is taken up by my catch can.

[NeedCAforS13]

make a new turbo elbow... or use an SR one. It has a port for the stock recirc valve that SR's came with (unlike CA's)

Sean

[float_6969]

darnit Sean. I thought I was being all helpful and was going to help him find out his problem. Then you just swoop in with the info that I don't have and make me look like a dumbarse! JK man! Hehehehe.

[euroboy]

i am running pig rich too and no it isn't because of the bov...i have a ka24e maf as wellthe fuel is just being dumped in there and my milage might as well be 1km for one litre...

[euroboy]

btw float on a side note i don't think it's the SIZE of the maf that counts, it;s what that wire reading the temp range that it signals to the ecu!....

i have the ka24e wire(the maf brain per se) attached onto the ca18det maf body...

[float_6969]

That is true. I just assumed that they all used the same wire with different diameters to vary the air flow speed and therefore give different readings.

[biosehnsucht]

wait you put the MAF sensor from the KA24E into the CA18DET MAF housing?

That could affect reading, as the wire senses X airflow but if airflow is lower (smaller housing) you'll overfuel.

If you already have a CA18DET MAF housing how come you don't just use the CA18DET MAF? Why'd you hack it up?

[float_6969]

Good question. I thought about asking, but it was late and that had "Can of worms" written all over it! JK, Heheheh

[float_6969]

Just wanted to get this thing ttt. I'd like to get some answers on this MAFS question...