I did this and i was surprised as hell. First off I dont have 6ports, actuators or pump. My VDI was closed. When me and my friends miata with JR intake exaust would race , I would catch up from behind him pretty good until higher rpms. I would seem to slow down after like 6.5 grand. It would seem to take forever to rev to 8 and was barely faster than his miata until i shift to the next gear(3) in this case and would pull faster from him. ( being lower rpms).

So i decided to wire my VDI open. First i was confused after i took off with them open. I did not tell a difference in my low end. I mean like from 1000 to 1500 were i launch in the city. So I gased it and what i can tell u is that the power curve felt a little flat after that like it wasnt as fast to eccelerate to 3500. But I mean like a small diference. So streetability as far as launching from a stop was no problem. The same. But after about 6000 rpms i was like... OH SHIIIIT... It actually put me in my seat all the way to 8000 rpms. 2nd gear reved out no problem. And it does it smoothly. I really cant wait to get headers. The extra top end that i will get seems uncomprehendible for an N/A. Since my ports arnt thier i dont get this alah sudden boom in ecceleration like most people. Its very smooth. It was actually funner to drive. I cant wait to get the racing sleeves and underpullies put on. I heard they give even better low end.

 

I forgot to mention... I was able to chirp tires without having to brake myself.

 

Yeah, VDI is pretty big deal on series 5 engines. I think the difference in power is more noticeable, than the 6-ports.

 

can you explain how you wired it

 

It was easy. I did it with everything on. All i had to do is take two vac lines off to make room. I got three 5 inch zip ties. Sort of a pain but i just looped on zip tie on the rod of the VDI. Standing on the drivers side fender. So now u have a loop on the rod that u can easily push the rod down with. Now conect the two 5 inch ties together. (if u buy longer ties u dont need to do this) Then loop in under the metal vac lines underneath the VDI. Thiers like 3 welded together. Then connect it to the loop u made on the VDI. ZZZZZZIT. Pull all the lines and the rod will *** down. It was very frusterating the first few minutes because i was like... HOW THE HELL.... But just be creative.

 

Where is the VDI?

 

...and what does it look like?

 

Its atatched to the middle intake under neath. It looks like an actuator. Has a rod. U will notice it if u look at the middle intake from the driver side fender.

 

Looking at it right now. So, the rod going down, attached to a piece that is going horizontal towards the intke. Put the wire tie on that, and pull that all down? Ok, I tried pulling on it and it won't move, nor can I get my hands in there to close the wire tie! Help!

 

Hey von, any help?

 

Under the dashport that has the rod extending from it, there are 2 10mm bolts that hold the dashpot to the manifold. Remove these, and pull the dashport towards you and it will slide off. Now the little tab will turn freely.

 

Can someone take a picture and draw on it how we can do this mod?

 

Hey daryl, sorry dude, but only 89-91 N/a RX7's have the VDi actuator. Unless you got a new car....
Sean Cathcart

 

ya some pics would be great. does a 87 N/A have a VDI?

 

nope, sorry dude, it'd be nice though.
Try reading the above post

 

scathcart..sorry that post wasnt there when i looked the posts
but thanks
lol

 

heh yup! do you feel a sudden rush at about.. 5k or so? mine were clogged at one point i believe but many.. `spirited' drives since i bought the car chnaged that. .hehe

 

VDI=Variable Dynamic Intake, pretty much like VTEC except not electrical.

I dont have a picture of it, but if your running a 16.3 in the car it probably doesnt have an 89-91 engine in it because they were more powerful. look right underneath your throttle body, if there is a VDI intake then right underneath the throttle body is where you will see it. big round place in the intake manifold

 

remember that if you use a VDI from an '89-91 for your intake on an 86-87.5, you need to use your old fuel injectors due to the difference in impedence of the injectors. If you look at the intakes between the 2 years, they are radically different with the VDI. Since this discussion, I am probably going to use my '89 intake with the '87 injectors and keep the VDI wide open.

 

if i wanted to put a VDI on my 87 what would i need?
can i put one on my year?
and would it help or not?
thanks for all the help you guys do for everyone
keep up the goo work guys

thanks
billy