OK specs 91 Rs camaro originally 305 5 speed , swapped 350 tpi 6 speed trying to recalibrate speedometer using a Dakota digital sgi-100 BT , so on my yellow buffer box it has 7 wires , yellow and purple are Vss , pink black goes to ignition its hot. then its has a brown wire ,red wire, 2nd brown wire and a black white wire. My main question is which one is my speedometer wire and cruise control? I know on older 3rd gens there would be a green wire for speedometer, my wiring is different tried finding information no luck yet help!

 

 

https://www.thirdgen.org/forums/thir...er-needed.html

 

I appreciate the reply , here is a picture of my buffer box wires I don't have a green wire or green black I'm guessing the red wire is my cruise and I guess the brown wire next to the black white wire is my speedometer wire? Sorry for the picture it was taken at night but from left to right , yellow, purple, pink, brown, red, brown, black white .

 

I'm not sure if there was any pinout changes after certain years. My '89 Firebird is,

Pin A - Ground
Pin C - Speedometer (4000 pulse per mile output)
Pin E - Cruise Control (2000 pulse per mile output)
Pin F - to ECM thru the C207 connector
Pin H - +12V switched power

The wires in the two-pin connector are the speed sensor high and low reference.

 

Curious to know what you wind up with here. I'm planning on TKX swap this winter and so trying to figure out in advance VSS situation. When I did the TBI to TPI swap several years ago I deleted the buffer and ran the VSS (purple/yellow) directly to the ECM (B9/B10). The speedometer and cruise wires that originally ran to the buffer were then run to the correct ECM output (cruise: B11 and speedometer: C1). It all works perfectly fine. I'm assuming you converted to speed density TPI, but maybe not.

I have read a few threads on here that say you can run the TKX/T56 17 ppm VSS straight to the 7730 ECM and then adjust the "Instrument Panel VSS Pulse Divisor" and/or "Road Speed Constant" in the BIN to correct the speedometer and cruise output. See https://www.thirdgen.org/forums/diy-...s-scaling.html

 

Yea I'll keep you posted how it works and yes its a speed density tpi swap I used my TBI harness . I think I'm going to try to get my speedo to work with the dekota digital since I already bought it. I know that seems to work fine for the third gens pre 90 models . I guess most 90-92s don't have a buffer box but the TBI 305s did if it doesnt work I'll look at trying the way you did it.

 

I'm going to be trying to figure this one out as well. Just swapped in TKX in 92 TBI (Originally Auto) car. I will be following this thread...

 

Which Dakota Digital box did you buy? SGI-100BT seems to be the newest version and the only one available.

 

PM'd you...

 

Yep that's the one I have SGI-100BT

 

Update the Dakota digital works . I had it wired up right but you half to push the plus and minus buttons down for a few seconds to let the device know you want to adjust speed . Off the buffer box my 91 camaro has a brown wire in pin c that is my speed out wire older third gens use a green blk wire . It works great just did a 20 mile road test speed is right and its reading my miles almost perfect .

 

I got mine working as well. I got help from Dakota Digital support but after providing them with the details they came back with the correct settings and it worked on the first try.

I have TKX transmission and I eliminated the buffer box from my 92.

This was my setup:
Set the SGI up for H-L, And CAL to 3.33. Then use output 4 to your speedometer 4000PPM, and output 5 to ECM 2000 PPM.

Any idea if I can just hook the red (cruise wire) to the same output running to my ECM?

 

I eliminated my buffer box as well as the wires go to the Dakota digital now. I had another brown wire that I believe is my ecm wire I actually didn't use that wire . I used output 5 for the brown speedo wire , seems to work fine so far , I think the cruise red wire you can stick in an outpost like 3 If I remember correctly. I'm not to worried about cruise control on mine still gotta hook it up on the tpi and my TBI cable was to short from what I remembered. I think my final setting was 358 to get mine to work I have a 327 rear end though.

 

Reviving thread: '90 TPI 7730 ECM TKX conversion
Dakota Digital SGI-100BT is hooked up as follows:
IGNITION+ to +12v switched
GROUND- to ground
SPD+ not used
INPUT to yellow from TKX VSS
SPD- to purple from TKX VSS and purple to ECM B9
OUT1 not used
OUT2 not used
OUT3 not used
OUT4 to yellow ECM B10
OUT5 not used
I'm getting power to the SGI-100BT and set the SPd OUt to H-L, however I'm not getting any signal to ECM (verified with data log) or speedometer.
Can anyone verify if I have this correct or, if not, what needs to be changed?

 

Got it! FYI, for 90-92 7730 TPI and TKX (17ppm VSS), Dakota Digital SGI-100BT settings:
IGNITION+ to +12v switched
GROUND- to ground
SPD+ not used
INPUT to yellow from TKX VSS
SPD- to purple from TKX VSS and purple to ECM B9
OUT1 not used
OUT2 not used
OUT3 to yellow ECM B10
OUT4 not used
OUT5 not used
SPd out to H-L and then set the "cal" to 1.55 (I have 3.23 gears). This got me within ~10%. Gonna have a friend ride-along to fine adjust with the Iphone/BT app while I drive.

 

Sorta off topic but a few ramblings and something to chew on...I did not want to buy a Dakota Digital for my '90 T56 convert and at the link, that is how I got mine to work once I understood what needed to be changed. Keep in mind that it's not perfect. The 17 ppm everyone is referring to is actually a 17 tooth reluctor w 1 revolution gives off 17 pulses. What you need to calculate is the number of pulses it would give off over a span of a mile which your gear ratio and tire diameter need to be part of the equation. Whatever that number comes out to, it needs to divide nicely by 4000. Any deviation will make your speedometer off by x%. TBH mines seems to be almost 10% off so 60 mph is actually 54 mph and something that I'm gonna live with. Another thing noteworthy...if your ppm calculates to more than 11 x 4000 = 44,000 than you cannot adjust the "road speed divisor" higher than 11. What this means is rear end ratios numerically greater than ~3.54 the calculation will take you above the 44,000 ppm threshold. With that said, not every "road speed divisor" from 1-11 is available to be programmed (see attached spreadsheet for available values). I'd like to run a 4.10 ratio out back but this will force me to get a DD or figure out a way to knock some teeth off the reluctor. Supposedly 1993 T56s have a 11 tooth reluctor but can't seem to acquire one. I've read some threads about using a 40 tooth reluctor and knocking some teeth off of it. Anyone got a solution to a reluctor with ~10 teeth, I'm listening.

 

Anyone using an SGI-5 and delete the buffer box for their TKX swap?

I have it wired up but depending on what output I use, the speedo either reads 10mph when I'm going 40 or 90mph when I'm going 20. Adjusting the + or - only moves the needle a very small amount.

The combination of switches and which output I'm using is obviously not correct for an 86-92 firebird electronic speedo. (No ECM)

-- Joe

 

I have an older SGI-5c, different from the SGI-100BT sold today but the principle maybe is still similar.

* Wire OUT4 (4000 PPM output) to the vehicle speedometer signal input.
* All my dip switches are set to ON, meaning the settings are:

1. ECM/PCM speed input
2. Low sensitivity
3. OUT3/4/5 set for high speed in
4. Faster output

This isn't even close to any of the examples in the user manual. I initially could not get it to work and one of my engineer friends read the manual and told me to use these settings and it suddenly worked perfectly. I don't understand why but he did and that's good enough for me.

 

I also have an SGI-5c that I bought about 10 years ago. Originally I was going to use it to correct a speedometer calibration but at the time I found the correct drive and driven gears.

Finally have a use for it. I tried what the manual said and it absolutely didn't work. I've give your settings a try, thank you!

-- Joe

 

That worked perfect. Got it dialed in today, thank you @QwkTrip !

 

I'm just glad I have friends smarter than me.