mx-7

I received the Innovate LM-1 wideband. I am have a singe turbo, 850X1660cc injectors, abd wolf3D v3.1. My car is having a lot of problem holding idle and it backfires very often. Timing is set to zero. Where do I start to tune the car? I only want to tune it enough to drive it out to the dyno. Should I start tuning it at idle, and then tuning it driving at light load and then more load after that? I was thinking of having some drive my car with me in the passenger seat and keeping an eye on the a/f and once it goes off the the range that I want, I would make a change to either add or take away fuel to that point (this is the point I noticed that a/f was out of range and where the rpm and load is at)until the a/f is in the range that I want.

j9fd3s

thats what i do. start by making it idle, then make it rev in the driveway, then drive slowly around, then you can get the high load on a dyno



mike

mx-7

Thanks for the reply. Let's say that you're looking at the wideband screen at idle and you see 19.5 on the wideband. How do you know what rpm and load it's at? Everthing happens so quickly.

j9fd3s

yeah thats the hard part. the haltech has a home key, so you can push it and you're at the right spot, i dunno about the wolf.



and btw try to tune in like a steady rpm, like cruise at 2500rpm in 3rd and just dial in that load and rpm, and then do 3000rpm, sam thing, once thats close then you can work on the stuff in between idle and cruise, and between cruise and full throttle



mike

jspecracer7

Get some type of data logger. Something that records boost/rpm and a/f. With the PFC and datalogit, it's cake!

mx-7

What a/f should I try to acquire at each load point.

At idle = 14.5 a/f thats at 0 load

12% load = ?

25% load = ?

37%, 50%, 62%, 75%, 87%, 100% = probably 11-12 a/f



The about cruising on the highway. What a/f should I try to obtain?

I think that highway cruising is using the 37% load but not 100% sure.

TheCamel

load will fluctuate on a number of things, throttle position, incline, and weight difference in the car (full tank vs. a 1/4 tank of gas) Normally the stock computer swaps back and forth over stochiometric alot (rich/lean) One of the things you watch for on a scantool is to see that the o2 sensor is constantly fluctuating at cruising speeds. Trying to watch a wideband get through your boost run and you may miss something. Datalogging is the key and having someone in the passenger seat while running to smack you when the system starts going lean on you during tuning so you can get your foot out of the throttle bfore the motor grenades.

j9fd3s

set the idle mixture to the best idle speed/vacuum. on the factory ecu's between 1500ish and 3200rpms they are running off the o2 sensor, so thats 14.7:1 +/- a couple %. after 3200 rpms the factory ecu goes full rich, 10:1 reguardless of load, although they need to because the turbos can make boost faster than the ecu can react.



mike