SR is being retarded, please help!!

[TougeTune180]

hello, im new to the site, and my car is a 91 RPS13 conversion, which i am struggling with terribly...it seems like everytime i fix something, two other things break. at first i was having trouble getting it to start, but now it runs EXTREMELY rich, and will not rev beyond what sounds like 2000 RPM. its mostly stock, with a FMIC and SSQ BOV, as well as Megan Racing 3" outlet and downpipe with HKS Sports-Type 2.5" catback exhaust. It has NGK-R plugs and an Exedy Stage I clutch as well. At first when i got it running, after it warmed up it ran exremely well, idled so smooth that it didnt even vibrate the car. but that only lasted about 3 days until it started running rich and having start up problems again. I've checked my plugs, and they are fine, and every coil pack is producing spark. everything seems to ckeck out fine so far, and the injectors are about all i havent checked as well as ecu codes. ive been told that its probably my MAF sensor going bad, which seems easy enough to have happened, but i dont know what one to replace it with if it is the problem. i would like to go to a Z32 unit to match my o2 sensor, but then would i need to get a new ecu? Also, my tach doesnt read, and ive been told thats cause of the DIS system, and the stock tach not being calibrated for it. is that correct? is there a simple way to fix it, or would i be better off just going after market?

whew, i know thats alot, but any help would be greatly appreciated, cause my car and i are in wyoming for the time being, and no body up here even hardly knows what an SR20 is, so i have no source of information at all other than online.

thank you once again

[Onizuka]

What year is your car?

For your MAF sensor, a KA24E sensor will work without any ecu programing, you will need to splice the KA24E plug onto your harness however. For the Z32 MAF you would need some sort of fuel managment like SAFC II to convert the signal to the stock ECU, in addition to buying a z32 conversion plug ($25 maybe?).

[xekushnr]

definately sounds like an MAFS problem. try borrowing a known good unit from a buddy and give it a run.

as for the tach, as far as i know it should work fine. are you sure the wiring is correct? even if the tach wasnt properly calibrated it would still register something on the tach.

[TougeTune180]

What year is your car?

For your MAF sensor, a KA24E sensor will work without any ecu programing, you will need to splice the KA24E plug onto your harness however. For the Z32 MAF you would need some sort of fuel managment like SAFC II to convert the signal to the stock ECU, in addition to buying a z32 conversion plug ($25 maybe?).

my car is a 91, so technically the tach should work, i think its just crappy wiring. i have the MAF from my old KA24DE, would that work? if so this may be easier to fix than i originally thought, i will just need to get a new harness connection cause i threw my old harness away.

as far as the wiring, im not too sure about it, the place that put my motor in did a very piss port job, and i was not happy with them at all. they charged me for a lot of stuff that they didnt install, and so i was dealing with them for about 2 months after i got the car out of their shop trying to get my money back. so i think that may be why the tach doesnt work, and im not sure if the temp gauge works or not, i never had a chance to drive it except for about 5 mins around the block when i found out that my clutch line was leaking and then it snowed for the next week or two, so i really havent been presented much time to work on it. i was also thinking about going with a full autometer gauge pod, just replacing all my stock guages with aftermarket, but i guess that all depends on how much i can fix my MAF problem for. what do you guys think? would that be a good idea, or would it be better to try and rewire all the guages that dont work?

i kinda want to look at ecu options though too. what is the best ecu that gives you the most bang for your buck, and is fairly easy to tune? i was somewhat looking at TurboXS's new GBA tuner, and liked the concept, but im not sure how well it works as a piggy back system, what have you guys heard about it?

[TougeTune180]

anybody?

*BUMP*

[180fan]

MAFS are cheap. Sold mine to a local for 20 bucks. Look around, you'll find em. The tach not working sounds like either 1 somethin up with your sensor or the tach itself. The DE's tach should work on the SR without a hitch unless the shop changed it with an E tach which won't work.

I personally wouldn't bother redoing all the gauges as they're easy enough to fix stock.

ECU's there's the AEM EMS which seems to be pretty popular, the Apexi Power FC which can be a bit tedious to tune, Haltech, Motec, Tomei's Reytec, and a few others. Look around.

[eliterit]

hold on there.

someone correct me if i'm wrong on this one, but i'm pretty sure that i'm right.

You said you're using your old ka24De? maf sensor?

and i know that wont work, it has to be the ka24e maf sensor.

[ill_sil]

hold on there.

someone correct me if i'm wrong on this one, but i'm pretty sure that i'm right.

You said you're using your old ka24De? maf sensor?

and i know that wont work, it has to be the ka24e maf sensor.

[240sxhoe]

its most likely is your maf.

it also could be the bov, i doubt the brand new bov would leak, but if it does it will run rough and real rich. also could be a vacum leak. check the piping.

[TougeTune180]

hmm, why cant i use the DE one? whats the difference? also, im sure its not my bov, that was what i originally thought, but i checked it, and it leaking a little, but i redid the gasket on it and it quit leaking, so it must be my maf. would i be better off to just try to find a silvia one online, or get the ka24e one off a junkyard car?

as far as the tach goes, i dont know what to think cause right now itpretty much acts like it wants to work, like when cranking the engine it starts bouncing around and stuff, but then once the engine starts it doesnt do anything. thats why i think its something up with the actual tach, and not the connection. hence i will probably replace all my gauges with aftermarket cause i have the spare cash (assuming i can fix the maf for decently cheap), and plus i will get a 120 mph speedo, which is better than stock. which brings me to another quick question: do i need to change out my speed sensor with a mph one off say a ka24?

[TougeTune180]

ok, so i found a MAF from a KA24E in denver for a good price, so im going to pick it up tomorrow and hopefully install it thursday to be driving it that night. i will let you guys know how it goes, thanks for all the help so far

[TougeTune180]

well guys, that did it! car runs now, all that needs doing is bleeding the clutch and it will be fine. thanks so much for your help and advice.