BPT: rich or lean

[OsoSlo z28]

the cheapest place i have found to do the motor swap doesn't have the means to install and tune the s-afc. for me to drive,speed craft is about 15-20mi from the place i'm getting the swap done. my questtion is will the bpt run lean or rich w/o the cont? i think more on the lean side, but will it be too lean to where it would make it dangerous to try and drive that distance? thanks.

[OsoSlo z28]

i had thought about his, but i'd probably get them to tune it anyway on the dyno...1. they're more experienced in tuning this item 2. i don't want to try and drive and tune at the same time. also, about the sensors....do i use the ones based on the motor or based on the ecu i'm using?

[OsoSlo z28]

94 4cyl, and i'll be running the bpt with the pro lx ecu

[OsoSlo z28]

this is true. i was talking to derrick today and it came down to this: he's checking to see if he can reprogram the fuel map on the stock ecu cause the pro lx ecu doesn't fit the dohc engines...plus the pro's have a vaf...not maf. another problem that came up was the crank angle sensor...the pro lx doesn't have one. w/o it, you'd have to swap pullies,oil pump, and some other items. so i bracket has to be made to fit the bpt engine...which this isn't that big of a deal. i also had to check my tps. since it's 4-wire, i'm ok...my plug fits the bpt. but for those with 3-wire, you have to do some crazy mods to the throttle body. yeah, i have to look into diff injectors. what is the impedance of the dohc mx injectors?

[Turboge]

The motor will run lean under boost. If you have an Autometer A/F installed you will see it reading Rich for a few seconds then blank out. This means that you are running very LEAN. I found out the hard way while running the motor for a week or two and having it blow up. The S-AFC works better with a MAP sensor hooked up instead of the TPS. With a TPS you only get a generic level of load on the motor and a general level to tune with. This is why they put them on N/A cars where atmospheric pressure does not rise above 0. When you go into positive pressure (boost) you need something to tell the computer that its more than just 100% load or 35% load, I would recommend a 3 bar MAP but some of the Escort guys are using 2 bar. Not hard to hookup at all either.

[OsoSlo z28]

oo7sniper, the chip is mainly for reliability purposes. it will make the motor run like it was a stock setup from the factory all while using my ecu and harness....very good thing. i can still use the s-afc if i want to increase power. it would be like using it on a j-spec 323 gtx.

[ProtegeSTS]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by oo7sniper:<BR><STRONG>I haven't had any problems with mine running lean. Tell me more about this MAP sensor! Mass Air Pressure? What does it do? How does it work?<P>----------------------------<P>Jeremy Miller<BR>93 Mazda MX-3 RS-R </STRONG><HR></BLOCKQUOTE><P><BR>Manifold Absolute Pressure. Its how honda ECUs work. Goto any of the major honda message boards, and there should be at least one tech who can break it down VERY well for you.

[OsoSlo z28]

a map sensor is also what haltech uses in their setups.

[OsoSlo z28]

i don't think your ecu can understand the input from the map sensor. so unless you have the haltech, i don't think it will work.