When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I found a built motor - 94 block with an 03 VVT head. I have read that you only need to solder two wires to control VVT with the Hydra, but that's all I've heard.
Does anyone know specifically what to do to allow the Hydra to control VVT?
Basically you have to connect your hydra VTCS pin to one of the VVT solenoid wires. I have no clue what the solenoid wires are but I am guessing it's 3 wire:
power
ground
signal
Or signal/ground??
Jeremy has the Hydra pinout. If yours is the same as mine, the VVT signal output pin is A11 on the small blue connector. Your harness may already be set up and if it's not, then you'll need to order some pins from Jeremy.
Anyways connect them bitches then
Go to Output Configuration
click PWM 2
Make sure PWM MAP 9 radio button is selected
input x rpm spread %
input y load spread %
Then hit ok or whatever
Then go to Select/3D PWM/PWM Map 9
That should be your VVT map.
Also here is the 2.5 manual and it talks about it more:
In short, your map is probably already set up, your harness is probably already set up so just wire that **** up. I don't have the factory wiring diagrams with me but they're on here mt.net somewhere.
BTW be careful. Jeremy told me of a few instances where customers did not make their map smoothed and fucked up their ****. I don't really understand that but take heed.
^ Thanks for the heads up. I don't plan on tuning it, but rather letting a "tuner" do it on a dyno. But, I am concerned about the settings during break in.
Right now my settings in my current map under PWM MAP9 are all set to -12.5.
EDIT; I will just make sure the OFF radio button is checked under PWM2 during break in. Then I'll let the tuner turn it on and set the X, Y spread and go with it.
I actually have the VVT retrofit stuff as a document, email me at work & I can send it to you. Same for TPS if you're coming from a 90-93 chassis, and 94 alternator retrofit if you're tired of your NB voltage control..
So this is a very old thread I realize but I do not have any A11 pins or A anything pins. I'm looking at the Wiring Pinouts for my Hydra 2.7. I have a 99 Miata which will now have an 01 VVT or VCT (hey we should add some more letters that mean the same thing just to further confuse folks, sorry, inside voice). I understand there is a +12v source (easy enough to find somewhere under the hood) and a ground to actuate the valve. I am "guessing" that the A11 pin called out above is on my chart the BB 11 - Trigger -ve pin? Or the ground in question??
Any guidance is appreciated.
Thanks,
Ken
Last edited by blackandblown; 03-19-2018 at 06:54 AM.
Reason: picture did not show
You run power to the solenoid and the Hydra takes the other side to ground on BA11 . Go to FMs site ,and download the Hydra manual , its all there .Fredb
First, thanks for answering and chiming in. I'm a bit confused though because on the 99-00 wiring schematic provided by Jeremy, BA11 is for VICS. I did read through the manuals from the FM site and they state something like this...."You can retrofit a VVT head or engine to a non-VVT 1.8. It is a lot of work, but it may be worthwhile for your project. Contact FM for the VVT wiring & Hydra settings info you'll need."
BB10 says VCT1 on the 99-00 Hydra wiring schematic. That "seems" like the right pin but then again it "seems" like this question would be spelled out in the manual (VCT1 is the ground for the VVT solenoid).
I’ll take a look at my car after work today. I know I flew a wire back to the Hydra for that but I’ll have to look and see what pin it went to. When in doubt follow Jeremy’s instructions. I know I have his instructions somewhere but couldn’t find them this morning. Fredb