I just Checked the ECU Diagrams for the 1993 7 and there are clear access point to the ECU(s) for O2, Injectors, Hmmmm Why are there 3 or 4 injectors? (Sorry I am Rotory challenged) Each side of the whatever it is called (piston) must be a compression point hence it's own fuel injector. MAP sensor access is easy also.

 

I was thinking about building a LED boost guage. I would be a low profile (1/2 inch tall) siting on the dash. I do not want my stock gauges cut up.

If anyone else is thinking of building an LED boost guage, here's a nice place to start
http://e-www.motorola.com/brdata/PDFDB/docs/AN1322.pdf
A google search on "LED boost gauge" shows several other home built gauges.

Here's a cool looking heads-up model you can buy.
http://www.machv.com/headupdisboo.html

I have 1 question for ShokWaveRider, do you tie the brightness of the led into the dash lights. You need to be able to read them in direct sunlight and not have them blind you with brightness at night?

 

The trouble with that one is it is only 10LEDS. resolution and accuracy are limited. I designed a 20 LED model that could be put in an external enclosure if you like. For alwmost 1/4 of the price of the one in the link.

Regards,

Ian

 

Mind You the heads up display is pretty cool if you can see it in the sun.

 

ahh i see, shokwave, now i understand...wow that would be very nice then....get it going, I'm ready for one now (hehehe)

 

one more question, how difficult would it be to have the a/f leds read from a wideband sensor?

 

flunkysama

I have that heads up modle, I am selling it too :-)
I liked it but it was in bar, not lbs... :-(

 

looks really nice. i think it would be best if you could get a more accurate a/f sensor to read from.

Ian, are you on any audi forums?

 

Yep Audiworld and I have an external sensor that I use on the Lotus for a more accurate reading if I need it, but I am pretty good at testing them and now I can tell which are good and which are not. It is usually the stock gauges that are the crappy bits.

 

i think he ment a widband 02 sensor vs a normal o2 sensor

 

do you have a way to calibrate the a/f gauges to a rotary's requirements? the optimal ratio is richer than what you have listed at the bottom on the website . is there a way you can get the correct ratio? it would be cool if you could

 

Let me know what you need and I will design it just for you. Providing you use a 1v sensor.

SWR

 

you know, like the 'number' led that corresponds with the rich or lean....number 12, i think, is still lean for the rotary. i believe that these things want a 11.2:1 which isn't even on your gauge. if you could start at say, number 7 or 8 being lean and then go to a 10:1 ratio or something, that would be ideal IMO. i don't know though, what do you guys think?

roy

 

The numbers correspond to voltages. So if O know the voltages of your O2 there is no problem. I can make it any way you like. conversly I have a digital one that can test it. Do you know the voltages? What is the part number of the O2 sensor. Most measure 0 - 1 v unless they are wide band.

 

here's the numnber from thepartsbin. probably not going to worth a flip, though. can't remember what the number off the bosch one i got last year.
Oxygen Sensor oe type cntr
C5010-55258
In Stock Bosch

 

Very nice work. Innovation and integration looks top-notch.

Kyle

 

OK I got your requirements now. You are right if you need a high LED number, from what I read RX7 at WOT (Wide Open Throttle) is 0.92 - 0.93. I would have to design a unit for you that LED 8 or 9 comes on at 0.9 instead of 10, No worries how many do you want <grin>

 

Check Out This Link

 

i'll be your first RX-7 Customer

 

Sure email me and tell me what you want. If you install the LEDS I have a kit now. or a stand alone unit in a small box ready to go. Check me web site, ignore the chart, I will make one just for you.

 

shok,
so do you have a sensor that'll read all the way down to about a 10:1 a/f ratio. the stock sensor can only read a/f around stoich., so we're gonna need a different sensor. it doesn't have to be a true wideband cause that'll be too expensive, but we need something that can read pretty rich ratios.

 

I was just going to supply the electronics. according to the artical I read, your O2 sensor is OK, see the link in the previous posts. The electronics jut needs to be able to read .9 - 1v at LED not 8 and 9. Otherwise you will have to but a copiously expensive sensor and kit. I only make the economical units.

 

the stock sensor is great near 14.7:1 but is inaccurate at the really rich levels that our cars run at.

 

Then replace it with a more accurate 1v sensor you can probably use most standard sensors.

 

shokwaverider, is there anyway to send you my instrument cluster and let you do it? i'm a little apprehensive about doing it myself.......

is it difficult?