not shore where and how to start tuning my vu ls1 & l67

General Tuning Questions And Discussions
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not shore where and how to start tuning my vu ls1 & l67

Postby s/c-3800 » Fri Nov 02, 2018 12:44 pm

new to the whole idea of tuning and consumed by it . i have a vu ls1 with auto ecu running a tr6060 6 speed manual . and a vt l67 with auto ecu running getrag 260 5 speed . the ls1 is running the otr and mafless auto tune .. i have since upgraded to 102mm throttle body ,6 speed conversion and extractors no cats to dual 3" so i have a few issues as listed
high idle (fuel&air ratios)
vats
o2 sensor
no fuel econ (250 km per tank if lucky)

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Re: not shore where and how to start tuning my vu ls1 & l67

Postby antus » Sat Nov 03, 2018 4:00 pm

at this stage you'll need commercial software to tune the ls1. Exactly what will depend on whats been done to it before. If its running a custom os for the mafless you'll need the tools the tuner used to set up. Its possible that they may have tuner locked it, at which point you'll need them to unlock it for you. Initially you could do something like get a usb allpro adaptor http://www.obddiag.net/products.html and use our pcmhammer software viewtopic.php?f=3&t=6080 to identify and possibly read the pcm. If you can read it, going ahead will be reasonably straight forward. If you cant the OSID (operating system) that it reports might help point you towards one of the aftermarket tools.

For the vt l67, would would be running a memcal computer and would tune it with an aldl cable and one of our pcm nvrams. See the hardware info in the FAQ area (link near top right) for more information. Typically you'd swap it to be "the1's enhanced" operating system as the definitions for tunerpro that are supplied with it are the best you'll find.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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Re: not shore where and how to start tuning my vu ls1 & l67

Postby GmanVS » Fri Nov 15, 2019 11:46 am

Hi guys, I've had a quick search but no luck finding an answer. Since I hate starting new threads, I'll post my question here even though it's old.
I have converted a VS L67 to Getrag manual. Everything is hunky dory but idle control.
Issues -
On start up the car idles at 2000 rpm for 2 seconds or so and then settles to 900 rpm where it idles beautifully.
When I drive a short distance (my driveway) in 1st, I have to put my foot on the brake to slow the car down.
When I disengage the clutch it revs at 2000 rpm for 2 seconds or so and then settles to 900 rpm where, once again, it idles beautifully.
I think these issues are all due to the idle control being set up for an automatic transmission. Does anyone here have any suggestions on how to get it to behave like manual when going into the 'idle' state (no load, closed throttle - would do this while decelerating too, I guess) from some other state?
I am running the Delco ECU with the PCM Hacking NVRAM and THE1's enhanced VS L67 code.

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Re: not shore where and how to start tuning my vu ls1 & l67

Postby antus » Tue Nov 19, 2019 4:28 pm

I think your right. Im not sure what variables off the top of my head but check IAC tables and Desired Airflow tables. For the high idle on start it could also be an enrichment problem. You can compare against a manual tune to see whats different too, and if it is an auto tune problem. If you find the problem please let us know for others.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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