Do you have a pic of your mounting point for it?

 

links dead i would love to see this

 

Does anyone have this document on file? I had it somewhere, it was a very nice read and I would like to fresh myself on a few things, too bad I cannot get ahold Dale...

 

....Must.....Read........





~Shar

 

+1 I'd love to see AVC-R mounting locations that other RX-7 owners have used, and the write-up that Dale put together.

 

I had this write-up printed out but I lost it. Can you repost it Dale? I'm having some boost issues and I want to go through the setup again to make sure everything is good.

Also, is there any chance of bringing your ClubRX site back up? I love that site. Even if I've already done the mods you have write-ups for I still love reading through your write-ups and seeing the pics and how you did it haha.

 

^ What are the boost problems you are having?

 

I'm not able to get above 1.2 bar, but it seems to be only in any gear above 2nd. I've noticed 1st and 2nd gears pull pretty hard, but still only get to about 1.24 or so, but 3rd gear and above don't pull as hard and normally I only get to about 1.21 at the most. IIRC I have setting A set to 1.4 bar and setting B set to about 1.8 or 2 or something, only because I was trying to make sure that wasn't the problem. I turned it off before and only got to .9 bar, so I was thinking maybe the spring was too weak or something. I have no idea anymore, I just want all my power haha. I'm trying to run 20-25psi between the two settings, or just set one setting and make it 25psi. Being that it acts differently depending on what gear it's in makes me wonder if it's not my settings per gear through the EBC.

 

Most problems with the AVCR come down to getting it adjusted correctly. It has a lot of capability but a higher learning curve than other EBC's where you just have one or two settings or maybe some *****. The AVCR is plumbed like every other EBC really. There's nothing complicated about it and I doubt you made a mistake with it.

What are the duty and feedback speeds for each gear? Those matter a lot. You have "learn gear" off for each gear correct? An "X" means that it's off. Now try Increasing the duty for the higher gears only.

General rule of thumb:

-- IF your measured boost is lower than the target boost, increase the duty cycle for that gear. You can do it across-the-board or just at the rpm ranges where the problem is occuring. You can do it across-the-board or just at the rpm ranges where the problem is occurring.

-- IF your measured boost is higher than the target boost, decrease the duty cycle for that gear.

To get things optimum though you still have the feedback speed ("gain" on other controllers ) and start duty setting (called "Start Boost" or "spring" or other names on other controllers.

-- IF you are achieving your target boost and then boost is falling unacceptably, increase the feedback speed. default value is 5 I believe with a max of 9. I would increase it in increments of 1 or 2 units at a time. This increases the rate of closed loop correction to your boost. If this value is too high you can have overboosting or oscillations.

-- IF you would like to decrease the initial spoolup time, increase the Start Duty for a particular gear. This will spool up the turbo faster but can lead to spiking. If you increase this value you may need to adjust the duty value down a bit. If you are having wheelspin problems in a gear then you need to be careful with using this setting.

Datalogit logs are very helpful for adjusting boost controllers, especially this one. Logging each change will help you understand the effects of different settings on your particular car. There is also a crude logging/playback capability on the AVCR.

 

Setting A:

Boost is set at 1.2 and Duty is 25%, while Feedback Speed is set at 3 for all five gears. I have 0 for all gears in Learn Gear, and I also have Start Duty set at 0% for all five.



Setting B:

Boost is set at 1.5 and Duty is 25%. Settings for Feedback Speed, Learn Gear, and Start Duty are the same as on setting A.


I usually have it set on setting B, so when I should be getting 1.5 bar I'm still only getting ~1.24 in the first couple gears and ~1.21 in 3rd through 5th.

I haven't seen where I can adjust Duty Cycle per gear though, what do you mean by that? It seems like it's just for the setting as a whole.

All of the settings I made on this thing initially (back on the stock twins) were from Dale's setup instructions on ClubRX. I figured I might need to change some things. I'm changing the Start Duty but what do you suggest I go with to start out with? I made settings A and B the same aside from Boost and Duty...

Start Duty- 1st and 2nd gear I made +3%, 3rd 4th and 5th I made +5%.
Learn Gear I changed all to X
Boost for setting A I changed to 1.25, left setting B at 1.5
Duty for setting A is now 30% and for setting B is now 35%
Feedback Speeds I left the same at 3 for both settings A and B

I'll report back tomorrow after I get a few pulls, if I can remember to do that haha. Thanks!

 

It's there.



I wish I could just give you values to use. It depends so much on the waste spring pressure, the amount of restriction in the exhaust, the weather, and the turbo itself. Here's one strategy to try when setting the controller:

1) with "learn gear" off and feedback speed at a low value, set the target boost as you have already done.

2) Raise the duty value up in 10% or 5% increments across the entire rpm range until target boost is reached. Use the peak display on the AVCR to see peak boost. It may fall off a bit after that. That's to be expected, at least initially.

optional: 3) Raise start duty incrementally in that gear until you get a slight spike. you can back down the start duty if you want to or keep that spiking characteristic and let the boost taper off a little bit as the revs climb. it depends how you want it to behave--the AVCR gives you that flexibility, but as you've seen there is a learning curve. In lower gears you may not want to do much with the start duty setting because traction is an issue.

optional: 4) this is the "fiddling" stage. from here you can leave it alone, or you can try adjusting the feedback speed or making small adjustments to the rpm-specific duty cycle or the other settings. You may jump back and forth among a few settings to try and get everything balanced out. The boost curve will never be "ideal" so you have to figure out how much oscillation or boost dropoff you are willing to accept.


As far as gear-specific settings go, generally speaking a lower feedback speed and a lower start duty will reduce spiking and may improve traction for lower gears. Higher start duty values will help spool up the turbo quicker by keeping the wastegate shut longer. Higher feedback speed can reduce the amount the boost falls off up top. If either the feedback speed or start duty is too high you can have oscillations or spiking. That's why it's easiest to first try and achieve target boost first by only adjusting the duty cycle setting. That won't give you an "ideal" curve but it will be more stable, most likely with slower spool and a steady fall off up top.

 

Just a quick update...I made some changes to the start duty and now I'm getting full boost. I still have to play around with it to set it better, but for now it seems to be working properly. Thanks!!

 

Dale, any hope of getting your original write-up reposted?

-Geoff

 

Checking back in on this 4 years later... anyone have a copy of this?

-Geoff

 

hi dale

im just about to do this but i don't know where to start I know it's a long time ago thread
but i need help to install mine as I can't seem to find info on how to install it
and the link doesn't work any more 😅

Thanx a lot michael

 

Unfortunately when ClubRX died so did the content. Some people have been able to find old copies of the site on archive.org so that's worth a try.

Dale

 

Managed to get the instruction manual. shows where to hook up on the stock FD twins.

https://mega.nz/#!cQdk1J6R!PUTbIOil2...CzUmJNsR5rjy1U

 

anyone find this? I'm also looking for the writeup. Haven't had luck on archive.org :-(

 

There is a write up (without pictures) on archive.org, date March 15, 2007

https://web.archive.org/web/20070315...=68&id=5&mnu=5

 

I went on a treasure hunt and collected some info for this AVC-R thread.

https://www.rx7club.com/build-thread.../#post12584220