luderone

ok here is what i did, I switched the afc setting back to -30 across the board. The car runs a lot better no sputtering at 4000 rpm, no engine light, but the car is running rich. when I start the car the a/f gage is in the orange witch is stoch, than it slowly goes in to red witch is lean. than the a/f gage reads nothing, no lights at all. so I can't depend on that gage. but i see black smoke coming out of the pipe. so i know i'm no lean, is there a nother way I check my a/f? thnaks crx88si, quickcrx702 you guys helped alot

88crxSi

an EGT (exhaust gas temp) works too, hotter means leaner.

-30 is also still pretty rich, but until you have a good way of viewing a/f ratio it can't hurt.


btw.. did u let the car warm up... o2 won't work til its warm.

luderone

i'll look in to getting one of those EGT gages. I still have a little sputtering at 4000 rpm. not nearly as bad as it was. do you think it would have to with those seceondary buter flys on the intake manifold? because I have the vaccum unpluged to the butter flys, cause I have no plug for the solenoid. and no I didn't let the 02 warm up. thanks again Ray

88crxSi

still some sputtering? try -31% -32%but with a big h23 I wouldnt go much leaner then that.

o2 needs to reach 600F. Wont do that in the first 10 seconds of warm up.

quickcrx702

just out of curiousity, what is the stock flow rating in cc of prelude injectors? you should find this out. right now, i am not turbo yet. however, let me give you an example. stock injectors for my car flow at 240cc, while dsm blue tops flow at 450cc. taking away 46% of the fuel would yield 243cc, which is basically stock. i have this set all the way across right now because i am not turbo. however, if i were turbo, my setting at idle would start out at -46%, and gradually increase as my turbo starts spooling. basically, i would slowly add fuel from -46% to like -35% depending on factors like how much boost i am running, and what rpm my turbo starts to spool at. if your stock injectors flow at 300cc(im just taking a guess, i dont know what prelude injectors flow at), you would start out at -33%(301.5cc), and gradually richen the mixture to something like -25%, taking into account all of the conditions of your setup. when you find out exactly what your stock injectors flow at, just do the math and figure out how much you need to lean out and richen your fuel.

luderone

Not really sure on what the stock cc's are. I Have dsm 450cc in right now, as soon as I get teh stock flow rate, I can get my afc a little closer yet. also I had a the engine light come on, and it was a knock sensor, where and what is a knock sensor? when the knock seneor came on the car ran really rough. CRXSI88: I let the 02 sensor warm up but still no reading on the meter. The only time I see anything is when I first start the car, than it drops off and nothing. thanks Ray

88crxSi

u must have the a/f guage hooked up wrong.

88crxSi

i just read this.. dont know if it applies to the h23 at all..but i bet the stock lude injectors aren't 240cc

Prelude VTEC Peak and Hold 345cc
Prelude VTEC H22 Saturated 280cc
how can i find out if my injectors are peak and hold or saturated

In order for the afc hack to work properly w/ map scaling you will need larger then 450cc injectors I think.

when u get to around 6psi I bet u will throw a cel because for proper tuning w/ 450cc injectors u will only be scaling it down to -25%.

Also with the base lude injectors being larger (345cc) you are leaning out (causing your knock).

I think, for this setup to run fine and dandy you will need 720cc injectors if indeed your stock injectors are 385cc.

Anyone have some insight to this?

luderone

the injectors in the h23 were 240cc I was told. and there are peak and hold injectors. yea when I hit boost the code does pop up. a guy on honda-tech told me this.

(i don;t think its you sensor, there is something wrong with your fuel delivers. from what i have read the h23 has 240 for injectors and when you do the afc hack with 450 you sould be runing -40 on the low end to -35 on the high end, -30 is to rich and may not be limitin the map signal enough and thats why your throwing the map code. ask in the FI board, but i would try the settings i recommended. thats you problem: fuel , not your sensor, right now you have to finish getting the proper settings so that you can "trick" the ecu into being happy. also make sure you afc is wired correctly.)

88crxSi

1992-1996 prelude w/vtec (h23 right?) has 345cc injectors.. see here...

http://www.turbomagazine.com/tech/0303tur_sawp/