Good idea, you need a webpage......

 

Ill put any diagrams or pictures of this people want to make up on my shitty yahoo website. email me at MDodd02@yahoo.com

 

BTW, my car ran ok like this today and then took a big crap...though I blew my motor. The 310's are apparently not enough to even run 6 PSI like I am doing. i must have gotten into limp mode when I finally went all out on it today and got some serious detonation. Nothin seems damaged, but I need to do a comp check...

 

The problem with using a MAP -> TPS on the afc is that if you change altitude you need to change the damn switch over point which is a pain in the ***. Thats not a problem if you stay within 5 miles of your house i guess.

I just wanted a system i could drive anywhere and it would just work. I guess for the totally hacker using a mix of my setup and the MAP -> AFC would be nice..but i just wanted something that worked without tinkering.

liam

 

310cc injectors are definately not enough, try 370 or 440cc for 6psi.

Dustin

 

ttt

 

Ok, so let's bring this thing together. Run an unlimited MAP signal into the MAP connection of the AFC---> This allows for for the "smoother" fuel correction of the ecu and account for moderate altitude changes, etc. Run an unlimited MAP signal into the TPS connection of the AFC---> This allows the user to "fine tune" the boost and vacuum sections of the fuel map independently. Then use the old TPS mod to throw the ecu into open-loop once boost pressure is sensed.

How's that sound...?

 

now why would u wanna do that? I don't understand what all this TPS stuff is all about. Doing it just as Liam described it is just perfect IMHO.

 

Just to give added adjustability

 

With either method you are decreasing the MAP signal back to the ECU. The MAP signal is one of the parameters the ECU looks at to decide when to go into open loop. It looks at manifold pressure and throttle position. Without the TPS hack to make the computer think you are at WOT whenever boost is present you would remain in closed loop with anything less than ~70% throttle (I think that's where the closed/open changeover happens) and the ECU would take out any extra fuel you're trying to put in until the O2 says things are stoich.

 

I just wanted to say that this is a great thread!

 

Exactly! Especially on a quick-spooling turbo, without the TPS mod I could watch the lights on the J&S go up like a christmas tree when I was accelerating at part throttle. I could almost close my eyes and make believe I had a JRSC.

 

doh, so in order to stay rich during partial throttle, u'd have to do the tps hack?? How is it done? I don't think i've ever read the old post on the afc hack.

 

Ok then, how do we get the car to respond to the TPS and jump into open loop sooner at partial throttle while under boost?? I mean it all makes sense, but up to this point, I have yet to hear a single ping at partial throttle boost, but then I don't really do that very often so maybe that's why..

 

now that i think of it, does it really matter if its in open loop???? Cuz we're not really just adding fuel just at WOT. The ecu adds fuel to anywhere it senses boost. If it were it closed loop, which fuel map would it use?


[Modified by zojirushi, 12:33 PM 3/5/2002]

 

[QUOTE]now that i think of it, does it really matter if its in open loop???? Cuz we're not really just adding fuel just at WOT. The ecu adds fuel to anywhere it senses boost. If it were it closed loop, which fuel map would it use?QUOTE]

But the ecu doesn't know that it's seeing "boost". Remember, at full boost, you're cutting the MAP signal enough to trick the ecu so as not to throw a CEL. Yes, it is still adding/subtracting fuel on it's own, but it's doing it blind. If the ecu remains in closed loop, it will use all of the various sensor's to try and maintain stoich a/f ratios---> bad if you're in boost at part throttle

Here is the link for a diagram of the TPS mod: http://www.artic.edu/~rjaffey/tps/relay-trick.gif if that helps.





[Modified by DSF, 1:03 PM 3/5/2002]

 

ok dsf..u make sense..but from talkin to liam personally he said it runs great at part throttle anyway.

dsf r u still using the same -40 technique? is it just a modified version of liams or what? maybe u should write a lil page on how to hook everything up clearly, becuz with all the questions..it gets kinda jumbled. and not all of us can understand electric diagrams such as that. and have u done this technique yet? does it feel just as silk as liam described? the people want to know..lol

 

The answer is...there is no right answer Everyone will have different set-up that will require different fueling needs. I'd break it down like this. I'd first use liam's method of 100% stock afc wiring with a general fuel correction to let the ecu do it's thing. If this works out (as it has for liam), then you "shouldn't" need to worry about anything else. If not, you may encounter two other issues/problems. 1) Part throttle detonation (caused by boost onset/lack of fuel) may be solved by the TPS mod from the link I posted (throw the ecu into open loop at boost onset). 2) Overly rich/lean off boost conditions can be tuned out by running an unlimited MAP signal to the TPS connection of the AFC (i.e. dbman96). This will allow seperate tuning of the boost and vacuum sections respectively.

Does that help any I really should get some real work done today

 

I agree, take it step by step. Thus far at least for me and liam, this has worked out very well (running a stock setup with lot's-o-trim), and then take it from there if need be.

 

vtc_civic, if your **** ever knocks in partial throttle , let us know I'm most likely gonna try the same setup with the dsm 450 cc injectors.

 

Hasn't thus far, neither has liam's.. I'm usuing a small GReddy turbo though so with less air flowing through there, that may be why i'm not knocking, don't know about liam..

 

yeah, i talked to liam many times, he setup all his friends cars with this same setup. All good so far and they're really satisfied with the out come.

 

for anyone who is interested, i have compiled a bunch of info on this afc set up that liam provided us with..basically a little write up. it includes necessary parts and equipment, and includes a lot of important questions people have asked, that liam and vtc have answered, plus a lot of good points made in my convo with liam, if anyone is interested i will post it. it cleared up all the cloudy issues for me.

 

sure, post that shiznit up

 

Definately post it. Or if you want, send it to me and I will put it on my site.... MDodd02@yahoo.com