Ka-T Troubles..... where do I start?...lol

[GoldenLeg]

Quick rundown of the setup.

Stock Ka from a 95.t25z32 mafrunning off a afc (i know, i know)

Basically this car has been nothing but trouble since I bought it. For a while now I have belived that the timming is way off, because of the afc. What let me to belive this is A) Hard starting B) Car dies down when put into nuetral... almost always resulting in it cutting off. Awsome.

So I go and start playing with the timming. I set it at the stock ka setting and go for a little test drive. Still does the same thing. I play with the timming some more and get the same thing... except with less power.

Some how I get the urge to check the bov. For reference, it's the RFL. I notice that it is really easy to open the valve.... and it almost does not want to close. So I put my knock off ssqv to see what happens. Yes I did oil it up before hand so that it wouldn't stick. Go for a test drive... same story.

Come on 240 gurus.... wtf is going on?

[MaximA32]

Get a better response here.

[DammitBobby]

What size injectors are you running? Are they new or used and if so have you had the flow tested? How did you setup your AFC? Running a open bov setup you will have to set Decal. I am not sure if the AFC has it I know the SAFCII has that setting. Also it is better to run recirulated BOV instead of OA.

[GoldenLeg]

Injectors are stock SR flow tested @370cc.

And I think im running 2 in 5 out.It's the new afc neo... I don't really like it.

I'll post AFC settings tommorow.

[GoldenLeg]

Do you really think if I run a recirculated bov, it will help the aflost wanting to cut off?

[DammitBobby]

Yes you will save yourself a lot of problems if you recirculate your BOV. The problem with open atmosphere it will cause rich condition when you let off the throttle because the MAF has all ready metered the air and is telling the injectors it needs more gas when in fact the BOV is vented the metered air to atmopshere. There is a decel function on the AFC that will help this problem but you have to set it up. It is under settings Decel. You will need to set that up now to fix the rich condition when letting off the throttle. I tried to use the decel function but I was unsuccessful. I had a turboSX knock off and I replaced it with a HKS Type 1 BOV and recirculated. Car now runs better then when it was stock.

[Biggamehit]

bro that z32 maf is seriously not needed with that size turbo and injectors man and may be one of the sources of your problem i am running an N60 .. also like the person above said you have to make sure your AFC settings are correct.. i run atmospheric and i have no DEC problems at all,

here are my Dec settings for example.

Throttle=1.4%Ne1= 2.3%Ne2= 3.3%

[Florida240sx]

Put the car on dyno or wideband?

[GoldenLeg]

bro that z32 maf is seriously not needed with that size turbo and injectors man and may be one of the sources of your problem i am running an N60 .. also like the person above said you have to make sure your AFC settings are correct.. i run atmospheric and i have no DEC problems at all,

here are my Dec settings for example.

Throttle=1.4%Ne1= 2.3%Ne2= 3.3%

My DEC settings are way different from yours

Throttle= 5.3%Ne1=1.2% @500rpmNe2=1.2% @1000rpm

Here are the rest of my settings...

HOTWIRENumber= 2 in 5 outCalc= single in single out

AIR MAP

_____500rpm__1000rpm__1500rpm__2000rpm__2500rpm__3000rpm__3500rpm HI____+24____+24_____+24_____+24_____+24____+24______+24LOW__+30____+30_____+24_____+24_____+24____+30______+30

_____3500rpm__4000rpm__4500rpm__5000rpm__5500rpm__6000rpm__6500rpmHI____+24______+25____+28_____+26_____+26_____+26_____+26LOW__+30______+30____+30_____+30_____+30_____+30_____+30

_____7000rpmHI_____+26LOW___+30

THR POINT

LO- 15%HI- 40%

[GoldenLeg]

Put the car on dyno or wideband?

Not yet. The car was street tunned by a local known tuner.

[GoldenLeg]

also.... could these be signs of a bad iacv?

[NateDogg]

Hard Starting: leaky injectors, bad SAFC settings

Stalling: vented BOV, dirty IACV

Check your plugs and tell us what you find.

[Florida240sx]

Your low setting should be next to 0% because you have 370's Go to a dyno, or borrow a wideband.Your settings are too rich for cruising which is most likely fouling out your plugs, and causing these symptoms.

[GoldenLeg]

Hard Starting: leaky injectors, bad SAFC settings

Stalling: vented BOV, dirty IACV

Check your plugs and tell us what you find.

The only way I get it started everyday is by hitting the gas while cranking. From what friends and local 240 owners tell me, the hard starting is most likely from running off the afc which pretty much jacks the timming way up. Car starts right up if I take my ratchet and turn the crank pully to the stock ka timming mark.

With the IACV, would it be okay if I were to clean it up (if possible) or should a replacement just be made?

I just changed the plugs the other day. The ones that were in there before were fine (little black on the tip). I just replaced them because I had to replace the plug wires that my mani burnt through I'll get pics up of the old plugs later today maybe.

[GoldenLeg]

Your low setting should be next to 0% because you have 370's Go to a dyno, or borrow a wideband.Your settings are too rich for cruising which is most likely fouling out your plugs, and causing these symptoms.

I'll see if I can find a wideband to borrow and post up results. In the meantime i'll play with the low settings in that range and see what happens.

[DammitBobby]

From what friends and local 240 owners tell me, the hard starting is most likely from running off the afc which pretty much jacks the timming way up.

No it will not jack your timing to make it hard to start. Having a SAFC will the alter the voltage input from your MAF. This in turn will put the ECU into a different map with different timing map variables. This will have a greater affect in boost and high percent changes. I never had a problem with idle because of a SAFC.

[Florida240sx]

The only way I get it started everyday is by hitting the gas while cranking. From what friends and local 240 owners tell me, the hard starting is most likely from running off the afc which pretty much jacks the timming way up. Car starts right up if I take my ratchet and turn the crank pully to the stock ka timming mark..

Don't listen to those idiots. I've turboed 3 240's and a few other cars. All running safc. Everyone one starts and idles just fine. They feel important by lieing to you. REason why all the cars I've touched work, is because I know what's what, and I got a wideband I use to tune right off the bat to remove all doubt of rich/lean condition.