Keith @ HPTuners and I figured out why my car was running poorly, or not at all, with some major tuning last nite... Like three hours worth. Nothing like having Denny's at 12:30a.m.

Basically I drove the car around last week, and then it started to stall out really bad. Saturday the car I could not start the car.

Plugs were not fouled as we initially suspected, it was the street tuning.. Car had a rudimentary street tune in it from before.

We ended up driving around for about an hour trying different calibrations in the FAST for the VE, IAT fueling, fuel enrichment table, AF, etc., and still have more to do.

Also have been able to connect with Intmd8, Z8's, 8seclt1, and Lance Ward at Fast to figure out where the values should be...

Car runs like azz in op mode 13, but after 10 seconds it goes into op mode 15 and runs great... Here is what Lance at FAST reccomended...

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Hi John,

The "Op Mode" sensor is an array of mode flags that are pretty much for our diagnostic use but in this case, the difference between a 13 and a 15 is that the afterstart enrichment mode has ended. This would be a pretty good indication of something not quite right with your afterstart tuning.

You should be fine with running open loop until 3000. Different combinations of engine parts and tuner preference will require different settings for this parameter. Generally speaking, Most people prefer being open loop at idle and closed loop at cruise/WOT.

If your getting a tip-in stumble from a steady cruise, you'll likely find the solution in the MAP AE settings. Make sure the AE MAP Decay parameter is less than 100 to slow the decay of enrichment from a tip-in.

VE calibration will vary with different combinations but we generally expect to see VEs of 90-100 at peak torque and 40-50 at idle. The idle VEs are the most sensitive to errors from the injector opening time setting and the WOT VEs are most sensitive to errors from Injector flow rate setting. There are exceptions however.

Hope this helps.

Regards,

Lance
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Next stop is to remove the current crank signal source and wire in the new FAST crank interface and the eDIST. We will be making the harness for the eDIST from scratch. I have my current crank box mounted in the glove box. I will be installing the eDIST and crank box in the glove box. Also installing manual rack and Moser front wheel studs.

 

sounds like a lot of work!

Good luck with it!

 

Second response from Lance @ FAST:

John,

You can eliminate or shorten the afterstart enrichment by modifying the afterstart parameters. Another way is to simply go WOT (TPS>80%) real quick which will force the afterstart to '0'.

Again, depending on the combination, 14:1 or higher should be okay but most engines like to be somewhere between 13:1 and 14:1 at idle and cruise. The leaner ratios are great for emissions and fuel economy but I think you'll find the idle to be smoother and the response a bit more forgiving when it's a richer.

Regards,

Lance

 

the saga continues...

 

do you have your crank sensor in hand?

im trying to work out a deal to get the fast system at cost, not sure how much that will be but it will probably save me a pretty penny.

 

I have the FAST crank box in hand.

Ryan it's hard to work on something that won't start.

 

Its hard to wire up and loom a harness in your living room? or its hard to jack up to put in a manual rack?

just messing with you John. Maybe your car is elsewhere...who knows....

I'd really like to see it run, versus seeing these threads. It just seems like its: Project Unicorn....Part Deux.

 

John, you need Dave Henninger at Hardcore Motorsports -------------->

He tuned the twin turbo hemi charger with the fast that took fifth in the Hot Rod street car shootout a few weeks ago. C'mon over to Flint!

-Geoff

 

Ryan (my spiritual muse)...

Between waiting for them to make the crank signal decoder interface, hereafter referred to as "the crank box," and a chassis shop that kept bumping me, some time has indeed lapsed.

I'm leaving now to change into garage clothes and go work on the car.

 

Update:

Installed Moser front wheel studs and Madman manual rack last night. Well the rack is not completely installed but it just needs to be finished up. I'll finish that and then wire in the eDIST and Crank Decoder.