VVTuner & ITB
#1
VVTuner & ITB
I am going to do a VVT head swap on my 94' ITB running MS2 in ITB load.
In the VVtuner software, the Y axis cannot be changed to TPS or ITB fuel load other than MAP.
Will I run into trouble when I use this with ITB where it doesn't have a smooth MAP signal?
Also, can I use the wifi dongle with the VVTuner box?
Is there any base tune I can use?
Sorry for my bad english.
In the VVtuner software, the Y axis cannot be changed to TPS or ITB fuel load other than MAP.
Will I run into trouble when I use this with ITB where it doesn't have a smooth MAP signal?
Also, can I use the wifi dongle with the VVTuner box?
Is there any base tune I can use?
Sorry for my bad english.
#10
I need to bring this thread up again as I am thinking about replacing my 1994's IRTB equipped engine with a VVT. Because I have a MS2Extra that will not control the VVT I will need to get a VVTUNER. Has anyone tried either of the two suggestions made above? Either staying with MAP or feeding the TPS signal to the VVTUNER instead of the MAP. Thanks, Chuck
#13
I run my DIYPNP using Alpha-N and the VVTuner by MAP, but the cam give so little vacuum so the MAP signal is a poor load indication.
Having the same value in the whole columns (no variation with MAP) means that there is no need to have the MAP connected at all.
MSIII would of course be able to use the same load for VVT as the rest.
Having the same value in the whole columns (no variation with MAP) means that there is no need to have the MAP connected at all.
MSIII would of course be able to use the same load for VVT as the rest.
#14
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Do you actually run the car like this? I'd expect driveability to be poor at 3500-4500 and low throttle openings - I've found that advancing the intake cam at anything under 50kpa or so causes bucking and surging.
#15
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I need to bring this thread up again as I am thinking about replacing my 1994's IRTB equipped engine with a VVT. Because I have a MS2Extra that will not control the VVT I will need to get a VVTUNER. Has anyone tried either of the two suggestions made above? Either staying with MAP or feeding the TPS signal to the VVTUNER instead of the MAP. Thanks, Chuck
The other option is to upgrade your MS2 to MS3 with MS3X and gain native VVT control and sequential injection.
#16
I'll probably learn more about VVT quirks during mapping runs tomorrow.
ITBs with mild cams will not have the same problem but the jump from some vacuum to none is close to instant (so MAP is almost only a closed throttle switch).
#17
Thanks for input. The 1.8 IRTBs I have, together with my adapter plate, will fit the VVT engine. Vacuum with my stock cam on the '94 engine is about 35 at a high idle of 1100. It goes to about 85 with TPS only showing 6% open, so I do not think I can use MAP for the VVTUNER input, but I wanted to ask if anyone had done this. Using the TPS seems like the way to go. How would I wire this? I have a Reverant MS2 Extra and I now have it connected to the original TPS (veriable) with stock wiring. I believe that's 0 to 5v. My wiring knowledge is very thin and I seem to remember folks having problems when splitting sensors output to add a VVTUNER. Chuck
Last edited by chucky; 06-05-2013 at 06:28 PM.
#18
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It's still early days but I don't get below 60kpa anywhere now. ˛top currently. 305 duration makes things a bit different though (no big advances, 24 degrees create contact valve-piston).
I'll probably learn more about VVT quirks during mapping runs tomorrow.
ITBs with mild cams will not have the same problem but the jump from some vacuum to none is close to instant (so MAP is almost only a closed throttle switch).
I'll probably learn more about VVT quirks during mapping runs tomorrow.
ITBs with mild cams will not have the same problem but the jump from some vacuum to none is close to instant (so MAP is almost only a closed throttle switch).
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