Quote: Originally Posted by
Drachonyx 
Hi David,
My current setup is a Varisafe that has the 0-5V output programmed with a RPM/MAP 8x8 grid. The output is clamped to 0 when the TPS is lower than 2.8V. The output is wired to a Varicool that injects only based on the 5V output. I got 2 nozzles: a M5 and a M3 (M3 is going to be replaced by a M5 soon).
I included the image below to show the injection curves I'm currently using.
I would first like to know how the "Tune" button on the VariCool will affect the injection curves if I set it lower than 10. Is it going to reduce the whole curves by a percentage? If this is not the case, is there a way to reprogram it to do this? I'm a programmer myself and wouldn't fear to play with the VS firmware if I had access to it.
Ok, let me see how I can help. First your insane (thats a compliment). Each time you lower the tune button on classic vari-cool it will change the overall curve by 7.5%. so if you set the tune to 6 when you hit your max voltage you will be at 70%. It scales new curve over your entire range.
As far as getting access to the firmware, you are insane (not as much of a compliment)
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Do you have access to the 150 psi pump specification regarding pressure versus dutycycle? Am I right to think that if the pump runs at 50%, it will deliver approx. 75 psi? I have calculated my chart's injection start points based on that assumption and I would like to know if I'm right.
Here's the formula I came with to calculate minimum required dutycycle:
((CURRENT_MAP + CHECKVALVE_CRACKING_PRESS) / PUMP_PRESS) * 100) = minimum dutycycle for boost
For example, if the MAP is 22psi, the checkvalve has a 22psi cracking pressure and the pump has a maximum pressure of 150 psi, I would need 29.33% dutycycle for the fluid to be able going through the line. What I'm missing now is the minimum pressure for good atomization. Having this, I could have a good injection start point. What is the minimum pressure I need to run with a dual-nozzle setup to obtain good atomization with the CoolingMist checkvalve and the 150 psi pump?
Thanks!
Drachonyx
it varies based on nozzle size(s). To know, you should simply put a pressure gauge in line and run the vari-cool at various dutycycle. If you have V1.04 of the Classic Vari-cool software or later you can use the prime button. There is a box where you can put the dutycycle in. You can actually keep changing the numbers from 1 to 100 and see what the pressure is for each one.
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p.s. : Would it be possible to hook the Varisafe to one of the injector ground and program it to inject based on injector dutycycle? Would it need any special hardware or one of the counter input would do?
We had done this in the past with the VS and you can get the injector dutycycle from 0 to about 85% pretty accurately, but after that it doesnt work so great so we never released it. To get the IPW is tricky because the pulse width is so short. We have the memory basically maxed out on that controller it cant read it correct. When we re-design the controller at some point this is one of many things we have planned.
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p.s. 2: Are there any chances that the Varicool and the Varisafe are going to be included on the same board in a near future? IMO, that would be great to have a single injection control module without needing to hookup two devices together. Plus, it would be probably cheaper.
we just designed 2 new controllers (VC2 and CMGS). we have alot of really cool things planned but I cant discuss them yet. The smart controller was the most complex thing we ever did. The software itself took us a year and a half. Its not something that we can just jump in and design there are so many things that must be considered including the small market for this device and the high cost/time of development.
I am really glad you are getting good use. Its hard for me to pick a favorite product that we have, but this is probably the one I am most proud of.
If I did not answer anything good enough let me know.
David
