So I finally got my big throttle body and big AFM with the N/A board on the car with a new intake tube and ran it with the wide band and its lean on the bottom end to like 300rpm and then it richens up to normalness. Also it's lean at idle and I cant make it richen up. Do I need an adjustable fpr now finally? Also how finicky is the ecu about cyl head temp? cuz the AFR readings were jumping depending on water temp it seemed. It was way better when it was hot to the point of the fan kicking on I think 180-185 degrees. but its still way lean while warming up and Ive adjusted the AFM a ton (half turn) to very little effect. Way awesome on the freeway, barely on the gas and its cruising 85-90

 

you may need to adjust the afm flapper some more, and the big afm, does it have the little bypass screw in the side of it?, i cant remeber, but close that one up, it will richen it. also check your timing, it gets important. you may need turbo injectors cause your running outta fuel like me. wire up the cold start valve to open at full throttle, or where ever, with a micro switch, it will help correct the lean condition.

 

The Turbo AFM I converted was pretty trashed. The screw was screwed almost all the way out. I think I have it a couple turns from bottom. I will try it closed up all the way, but it will make it super rich at idle wont it? its fine past 3k rpm though at 13:1 or around there right? Whats considered lean on these car? The stock setup ran 14:1 until about 3500rpm then it started to go lean. Im afraid to check a plug after seeing how lean it ran around town, especially since it was leaving aluminum on the plugs running at 14:1-15.5:1 I have two more meters to hack apart if I cant get the results I want with these. The EGR and all the vacuum stuff is still hooked up and working too.

 

you may try richening the flapper part, but 13:1 is pretty good. its not going to run quite right when you start screwing with these old crappy processors (if you can call them that). i actually took mine turbo afm out, it was running crazy rich for a while, just to keep the bottom proper. id say tune for the bottom, and advance the timing. it makes it better, but the top end will just have to be a bit rich. the timing will take care of some of the extra fuel. i had my total timing at 40 deg!! i was gonna put mine back in the other day, but got lazy.

 

How do you have your turbo AFM mounted? 40 degrees isn't bad, we run the stock car motors at 40-41 degrees, anything less and the stainless exhaust melts off. I'm gonna mess with it more tomorrow.

 

i never did mount it, the lines held it in place. i want to make it mount, but the runners wont let me.
this top pic is the finished one, the thing just hanges there.

 

which throttle body is that?

 

It looks like a 240SX tb that's been cleaned up?

 

It's a Webber 60mm if I remember correctly...

 

That's strange. It doesn't look anything like my Weber Big Throat TB as I recall. I'll have to pull it out of the box in the garage tonight and see if I need to cut back on the hallucinogens...

 

Yah, it doesn't look anything like my 240sx TB Playingwith this pinwheel AFM is killing me. I wanna go 300zx ecu, but went to like 5 junkyards and none had z31s.

 

hahaahha, its like the webber, but its msa version, or at least the one they sell, thats a cool 234 dollars of big bore fun slapped on the front of that small cast manifold. oh yeah its port matched.

 

just got a 1985 z31 ecu engine harness and AFM and misc pigtails. Now the real fun will begin. Wire cutters and beer anyone?

 

let me know how it goes, that my next project too!! i was gonna be one of the first n/a guys, but thats fine, i let you play first!

 

Right on right on! I wanna see this work! It will "revolutionize" the 280zx n/a if it works well.

 

wouldnt be to hard, would have to wire the NA with the turbo harness and dizzy, just run the swap as you would with the turbo one then in nismo's write up. i mean, if i wired the turbo harness and turbo stuff onto an NA motor, why couldnt you do that same thing, but minus the turbo and manifold, instead leav it NA, do the Z31 swap crap, call it a day. sounds like a fun weeks worth of work.

 

yeah, i just cant find the stuff here in b.c. to do the swap. bleach has a maf for me i believe tho. yay bleach! i need the rest still tho. i put a post up awhile ago aboot it, but alas no help came.

 

watch hybridz.org and classiczcars.com and zcar.com classifieds you should find all your stuff in a few weeks

 

It will work, it has to. I hope it makes a magical extra 40 horse, but I would be happy with consistent AFRs and a smooth idle

 

im hoping the same, extra hp, even 10 would be nice, but the more the merrier!