Hey guys,
I was wondering if anyone could help me. I'm planning on doing some road tuning with my Mazda 6 MPS, which currently is only mildly modded (Hybrid T&F front mount, BNR Stage 1 turbo, Boost controller - stock boost, interceptor computer - untuned). I'm using an OBD-II scan tool reading the wideband AFR PID. It updates twice a second over bluetooth, but I'm thinking for the tune, I can use USB, which might give me 5 updates a second - enough for real time tuning.
I want to create two maps - one for 98 RON fuels, and one for E10 fuels. I'm currently running fairly rich, especially on boost (Fairly visible black smoke behind me when I floor it), which ironically doesn't happen on E10. As all the 6 owners probably know, dyno time for a 4WD dyno isn't cheap, and enough dyno time for two maps is probably not going to give me much change from $1000.
Long story short is that basically, with a kid on the way, the budget for dyno time is all of $0, so I'm planning to do a road tune using a combination of the OBD-II reader and the butt dyno.
A friend of mine who used to own a tune shop, said that most cars will respond pretty well if you follow the following rules:
16-17:1 for idle and low speed cruising
14-15:1 for light acceleration without boost
12-12.8:1 for any on boost conditions
From what I know of previous cars, that sounds right, but the Mazda might not be like that due to differences in DISI engines? Don't know...
Anyway, what I was hoping for was:
1. Scans of AFRs against RPM on a dyno
2. Any 2D "relative" fuel maps people might have, dumped from their own dyno tune
3. Any 2D "relative" ignition maps people might have.
Yes, I'm aware that every car is different, so I can't just blindly copy values, but it would at least give me an idea of which part of the map is a little too rich, which part is way too rich, any parts which might already be too lean, and where I can afford a bit more timing advance. My map will be fairly conservative - I'm not trying to get the most power out of this, just get a bit less black smoke, and a touch more power than I already have.
Any help in this respect would be appreciated. Thanks!