Ok, well then I'm glad that people stray off topic. That's the way I've learned as much as I know.

 

Here here!!!!
Let's all play nicely, now...

Ren

 

Mazdaspeed7- I saw the pics of you engine compartment, and I think there is something VERY strange going on here. It looks identical to mine except I have the AAS actuators on my shock towers.
We have a lot of the same style of mods.... Focused on simplicity and efficiency of the engine to improve power. Funny- my next mod in planning was to mold a air director to put into my secondary port tracts!
Glad that worked out, now I know it's worth it...


Anyways... I want to clear up another misconsecption RIGHT NOW!!!!
*You do NOT need an RPM actuated swicth to acutate the VDI!!*
The ECU sends a signal to the solenoid, which provide actuating air to the VDI diaphragm. Use that signal!!

You can mount a power lock solenoid if you want (just don't stay over 5500 rpms for more than 30 sec at a time, not like you would)

Whith the VDI in low you get great low end torque, but it kindof dies in the high end, not good for passing!
WIth the VDI in high you lose a little bit (I don't find too much at all) of low end, but high end really screams! You car will race much quicker if you can keep the RPMS up.

ALso- I didn't wire mine, I just popped the diaphragm rod off of the vdi "finger", the rod is spring loaded, so it will extand when you do this, and it presses sidways again the VDI "finger"-keeping it in position. I can flip it from low to high in about one second. (just gotta pop the hood)

 

Mine would only stay to the low rpm setting, so i had to wire it to keep it on high. You will absolutely love smoothing out the 6 ports. my car has more low end now than it did before them with the VDI set on low. I was very impressed.

You have some really bad traction issues, dont you? I seem to be having that same problem too. I went to the track tonight, and ran a 9.9@72.8 with a 2.4 60 ft time. 1/8 mile, of course. With my new tires, I should get my 60 ft time down to 1.8-1.9, then Ill happily be in the low 9's. And I think Ill be street porting(at least) my motor within the next 2 months.

 

Anyways... I want to clear up another misconsecption RIGHT NOW!!!!
*You do NOT need an RPM actuated swicth to acutate the VDI!!*
The ECU sends a signal to the solenoid, which provide actuating air to the VDI diaphragm. Use that signal!!

Wow. That's a really good idea.

You can mount a power lock solenoid if you want (just don't stay over 5500 rpms for more than 30 sec at a time, not like you would)

Actually, I spend a lot of time over 5500, so that wouldn't work for me. Is there some other type of solenoid that extends, without burning up when left on for extended periods of time?

ALso- I didn't wire mine, I just popped the diaphragm rod off of the vdi "finger", the rod is spring loaded, so it will extand when you do this, and it presses sidways again the VDI "finger"-keeping it in position. I can flip it from low to high in about one second. (just gotta pop the hood)
Wow, thats another great idea!

 

Hey Adam, i noticed in the last page, you said you had a low 14second car. Then you posted that you where turning a 9.9@72.8. in the 1/8. I respectfully have to disagree. Here's a break down of one of my friends 89 did in the 1/4. He was on 195/50/15 toyo proxes, with all the bolt ons, except a ported intake.

60' 2.411
330 6.485
1/8 9.917
mph 71.27
1000' 12.926
1/4 15.489
mph 87.79

yes, you are a hair faster through the 1/8, but short of having slicks i don't see how you are going to get from a mid 15 second run into the low 14 second run. Roughly slicks will take off one second.

I don't have a scanner to post the time slip, however, any of the guys in the rpnw club (Blake, sethb, turbojeff, turbofb and some more.) or Rob at Pineapple will vouch for me. Just to let everyone know that i'm not just pulling numbers out of the air.

CJ

 

For one, Im still trying to sort out some peoblems on my car. Mostly electrical gremlins. For one, Im having some hesitation between 7K and 8K.

As for my time, I was getting horrible traction at the track. I was spinning my tires most of 2nd on every run. I just could not get my car to hook up until right before the end of the 1/8. I didnt really hook up until ~60 or so.

 

A note to all you off topic posters out there:
THANK YOU!
u guys know much more than me about RX-7's (seeing as i don't own one yet) and this is how i learn (that and playing inside the engine bay, but that won't work yet, will it...).
so, umm... thxs...
and 2G RX-7s kick ***!
(i'm buying one this spring... i hope)

 

I guess i still don't see, how you can have a 14 second 1/4 mile car, given, you only race 1/8 mile. I just want to know, how you came to the conlustion your car is a 14second car, but never ran it at a 1/4 mile stip. Given the 1/8 mile numbers you gave, your car is a mid 15 second 1/4 mile car. No if ands or butts. Furthermore, i doubt you are spinning tires. Maybe clutch, but i sincerely doubt tires. Unless you're running something like a 165/60/15, or something ultra slim. CJ

 

I really dont feel like trying to argue about my car with someone who has never seen my car, been it, etc. Also, you dont know the track I go to. It is a really slick track. BTW my tires were Cooper Cobras, 205 60R-15, and they dont grip well at all, esp on that track.

 

Well, You can use a servo motor, from a hobby shop- But they are usually about 9.6 volts- but might work with a resistor or something. Also- It would be fine for 2nd gear and up, but I don't know if it will move fast enough to give an instant changover in 1st gear.
Actaully, now that I think about my R/C cars... ya I would be.


About the 1/8 mile stuff- I know my car is crap in fist gear untill the top of second. I usually win races by trailing cars for the first while, then blowing by from 2 cars behind after shift to third.
My best 1/4 mile time is 14.54, which is decent, but I have a ported engine and a whole tons of stuff done.... so You'd think it'd be a little fatser. Well, It's my first gear and my launch, holding me back. because my MPH at the end if the 1/4 was 99.6! With cars that are low on torque like rx-7's it's really hard to compare 1/8mil and 1/4 mile times, since most of the real rotary style of acceleration happens after 2nd gear.
Oh well- I have never raced a 1/8 mile, so maybe I don't know what I'm talking about.
Mazdaspeed7- I wil definately be smoothing those 6 ports out... Oh, I also have some problems... I'm getting real sick of them!!! I am posting in the tech support question- If anyone has any input- lemme know!

 

"About the 1/8 mile stuff- I know my car is crap in fist gear untill the top of second. I usually win races by trailing cars for the first while, then blowing by from 2 cars behind after shift to third. "

This is kinda the same as me, except I have 4:30 gears, so it compensates for a lot of my low end problems. My 5th and 6th ports open on occasion, and I'm not sure about my VDI, but I'd assume it's not working right. I'm going to get Pineapple Racing's port sleeves, and hopefully I'll get this damn thing running right. I have quite a few mods, and I am pretty sure I could get into the mid to low 14s if my car were running right. Even with it's problems, it is quite fast. I have a full free flow exhaust (no cats), intake (w/custom cold air box), no extra weight in car (I do still have full interior and all emissions equip. except for an SAP), Magnecor 10mm plug wires w/plat. plugs (please post opinons on plats. I get people who like em' and some who don't. I really can't tell a difference that makes me dislike them), 18# flywheel, cross-drilled rotors, SS brake lines, main drive and alternator underdrive pulleys (not yet installed), APexi' S-AFC (not yet installed), silicone vaccuum lines, and that's mainly it that has much to do with weight and speed. I definitely don't have the fastest car, nor will I ever, but it IS fast, and I love it, and I'll continue to mod it the way I wish regardless of what anyone thinks, because it is mine and it probably keeps me out of trouble (and also gets me into it at times ). Oh yeah, I forgot to tell you that my car is a 91' NA Coupe (signature), and it used to be an automatic. I swapped in a TII tranny and a TII diff. that I had a 4:30 ring and pinion set compressed into (yeah I know I'm an idiot and it was expensive and all, but I love my car too damn much to sell it. Too many memories, and it's been so good to me. I wouldn't think of selling it, unless it was an outrageous offer (and it won't happen). Anyway, I'm learning quite a bit lately about how my car actually works. I'm beginning to understand what my problems are and why they are occurring, so hopefully I will soon be running in great condition. Good luck to all you guys with this rather expensive, hobby that is well worth all the time and effort we put into it. Please don't flame one another on her about their times. If someone posted some phony times, then just don't worry about it. If you don't believe them, then they are not hurting you, and probably only fooling themselves. People learn from inquiries, suggestions, and other helpful comments. People are only angered or upset by spiteful or negative posts, so why post them.

PEACE,
Derek

P.S. We are all in this together. I know some things you guys don't know, and you know some things I don't know. That's the case in point.