1988 turbo 331 TW heads mspnp2

yup, pin 10 watches the clutch switch [not sure if the MS2pnp watches it].... what do you want to do with it??

what needs work besides the obvious?? remember i am looking at a datastream

90sickfox said:

The obvious fuel trim stuff. Nothing ot of the ordinary going on. Looking at the WB I'd feel comfortable driving this thing anywhere. The only lean spots are really on down hills, coasting, off throttle, and clutch out. Normal condition for leaner burning. ( I think )

Did a quick search and found that it does use the factory clutch switch input from the 60 pin. The ovrr on the 26 pin is for an extra or added switch.

I just wanted to make sure I could use all the functions... launch control a and flat shifting. Neither of which I'll probably ever use.

I've been looking at so much information. I'd love to find a use for the four abs switch spots. If I was a computer guru I'd find a way to make a traction
control box. The module would have to recognize wheel spin difference and trigger an input into the switch table input. The sn95 abs module is stand alone. I'm sure there's a way to take the module off the hydraulic solenoid pack. It has to send out a signal to cut the abs light on when it sees wheel slip. I don't need it while braking...just when on the throttle.

I'll have to do more research on that. There's one available for MS3 that utilizes 2 wheel speed sensors.

Click to expand...

Ms3 is setup for that, you can do all kinds of stuff the ms2 cant... trust me I have maxed the ms2 out and then some.

As for the lean conditions, anytime you lift the engine will (and should) go lean. Coasting with the clutch out (engine braking) will/should go lean. Totally normal.
Flat shift and launch control are easy to setup. Let me know after we get the car closer to d day and I will enable them. TFI wont work with spark cut well unfortunately.... we are not controlling the coil directly, just the signal the tfi gets.

90sickfox said:

In the log I can see an area that needs some work. I'll post a little more info tomorrow. It's a little lean in one area in particular. Everytime the car hits that area in part throttle the afr drops to 16- 17. I'm going to try to fasten it up a little 1 increase at a time. It's only a 4 box area. I'll post everything that I do.

I know we're not done, Steve. I just feel a little bit more comfortable.

Click to expand...

I see those area's as well, two of them are sustained lean spots, meaning that they just need more fuel added to them. Now that i have increased the aggressiveness of the EGO correction in the last tune revision You can watch the ego correction and get an idea of what is missing fuel, this is not 100% accurate however as the EGO is always playing catch-up to correct the issue. I also see that the Acceleration Enrichment needs work, it almost never activates during these small throttle adjustments.

Lets take a look at some different views from the datalog you posted....


This is a Scatter Plot view I like these to see how the engine is performing/used... On the left i have what I call the {engine operating range} If you zoom in you can see all the dots in the plot, this shows us the areas that the engine is using of the fuel map and what areas need the most resolution when building a comprehensive tune.
Now the view on the right is simple, A tune that is spot dead on will be a linear line from the bottom left to the top right.... If this plot has dots scattered all over then the tune needs significant work. Yours looks ok but notice how the line has a slight curve to it, this just wont do.... when this line is linear we will be done. This is a fun view to use to gauge the tune from.



This is called a Histogram, I have the same x and y axis loaded in as your fuel table. then i used ego1 as the z axis [z is the field you want to show in the boxes]..
some of these boxes show 104 7ect... that means the ego correction is adding 4% fuel to those areas on a consistent basis, this view averages the ego correction from the entire log file for each box. 100 means no correction and less than 100 means fuel was removed.
This is nice to use to quickly see what areas may need some adjustment.


This is the same view as above with your AFR on the Z axis. this is the averaged reading for each box from the log file. the boxes in green means the car was in that area often they have more 'hits' these numbers can be taken seriously, yellow is fewer hits and anything with a number but no color in the box ignore completely it may be based off of one reading.


I hope this info helps when looking at the log files.

here ya go man, we are 'fairly' close at this point.... its still only 85% in my opinion but my hands are tied for the main fuel tuning.... I made some startup and warmup changes.

FYI you can open multiple logs into the same datalog view by holding the Ctrl key and selecting multiple files before you open them. I use this to make your multiple logs into one large log.

the idle valve is fighting me, I am attempting to get rid of that rpm spike then dip on startup. Looks like the bucking is low speed related and caused by the more aggressive AE settings i put in, simple adjustment.

Its the little things Scott.... the second crank on start does not bother me but the bucking issue does, see if this sorts it out.