Brian Biley sent me here to find info but I can't quite get it with a search. I want to install his 180 MPH conversion on my 120 MPH speedo. Shown here: http://www.jbrianriley.com/
I have converted to a 4,9 Cadillac complete drivetrain, including the Cadillac automatic transmission. I need to connect to the trans to make this work and I am searching for information on this. Thanks in advance

Do you just need to know the wiring, or how to recalibrate the speedo to work properly with the new guage face?

Eric

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Used is such a harsh term. . . I perfer "Previously obsessed over" ;)
88 base coupe: Busted again
Wait. . . Did I just say I can't wait to do more work on my Fiero?. . .what, am I retarded?

quote Said by Crazy Dave "You can take Steve out of the trailer park, but you can't take the trailer park out of Steve."

(\__/)
(='.'=) <<<< Cute Bunny.
(")_(")

It is the wiring that I need to find out. I understand the recalibration is done by adding his crystal. I just need to know IF there is an output on the side of the Caddy trans, and HOW exactly to connect to it. Thanks

The transmission VSS signal output goes to the ECM.

The speedo gets connected to one of the ECM's 4000ppm output. You also need to install the clamp circuit between the ECM and speedo as shown at http://www.fieroaddiction.com/speedo.html for it to work correctly.

[This message has been edited by Mickey_Moose (edited 01-24-2007).]

quote Originally posted by Mickey_Moose: The transmission VSS signal output goes to the ECM. The speedo gets connected to one of the ECM's 4000ppm output. You also need to install the clamp circuit between the ECM and speedo as shown at http://www.fieroaddiction.com/speedo.html for it to work correctly.

^^^^^^

What he said. The Caddy ECM has two 4000 ppm outputs so you have twice the opportunites to connect to it. I have heard of at least one example where one of those lines went bad but the second still worked.

THANKS Anywhere that I can buy the converter and the speedo overlays in one stop?

quote Originally posted by Daleford: THANKS Anywhere that I can buy the converter and the speedo overlays in one stop?

The converter is beyond simple to make yourself, just follow Rockcrawls page and you will have no problems. You can buy the parts at any electronics part store.

Thanks Mr. Moose. Good old Rockcrawl, he has all the answers. Thanks for the tip

quote Originally posted by Daleford: THANKS Anywhere that I can buy the converter and the speedo overlays in one stop?

Do you mean the converters to make the Caddy ECM output work with the Fiero speedometer, or the converter to make the Fiero speedometer 180 mph? The Rockcrawl circuit will do the former.

The former. I will get the latter from Riley as part of a kit. Thanks

quote Originally posted by Mickey_Moose: The converter is beyond simple to make yourself, just follow Rockcrawls page and you will have no problems. You can buy the parts at any electronics part store.

Mr. Moose I see the converter I need on Rockcrawler's website, but it only says he will have it available soon. It doesn't say what it is or where I can get it. Am I missing somethhing? Can you or someone help? Thanks in advance

quote Originally posted by Daleford: Mr. Moose I see the converter I need on Rockcrawler's website, but it only says he will have it available soon. It doesn't say what it is or where I can get it. Am I missing somethhing? Can you or someone help? Thanks in advance

Doh!

I see Rockcrawl removed it from his site - well here is a scan of the info:

Now, I don't want to sound too dumb here, but I am not the one that will be doing this conversion. I am the one who takes the info to my mechanic. So pardon the following question. Which are the $1. parts in your schematic? I am assuming they are the resistors, but I want to be sure. thanks again.

If you print out the schematic and take it to an electronics components store, they will look at it and sell you the correct parts. Then it's just a matter of soldering the parts together with some wire leads (to be spliced into the speedo output on the PCM and the Fiero wiring.)

Rockcrawl makes these for sale, btw, and occasionally sells them on Ebay. (Which is why he pulled the schematic off his website.) He has one up for sale right now:

http://cgi.ebay.com/ebaymot...dZ1QQsspagenameZWD1V

[This message has been edited by Brian Lamberts (edited 02-04-2007).]

------------------------------------ I thank you -----------------------------

I found some info you can use about the conversion to re crystal you spedo
http://www.realfierotech.co...2db509d0fe19485834b7
here is a formula they used
From floridafieros.org

From: Rick Stewart

"What is the formula for the speedometer? Can I change the crystal and recalibrate my speedometer to go higher?"

Okay, here's the speedometer formula:

Crystal frequency (approx.) in MHz = 534 / max_speed.

So, for the 120mph speedo it's 534/120 = 4.43 MHz
and for the 85mph speedo it's 534/85 = 6.33 MHz

Select the Xtal that matches your desired speedo range and recalculate:

534/freq = max

But the real problem is making the dial...

From: Oliver Scholz
there was also some one on the net if you provided your email address they would send you the different overlays. if i recall they even included a 200mph one you print them on special paper and glue them on if i can find it i will post info.

This circuit DOES NOT recalibrate the speedo, it clamps the voltage at a higher level that the Fiero speedo can use. The signal strength is too low as outputted by the Caddy ECM to be useable with the stock speedo.

This same circuit is needed for most all newer engine swaps (that use and 'modern' ECM) with the stock Fiero speedo - not just the 4.9.

You can buy ALL those parts for less than a $1 total - and not to sound like a prick, but if you are having problems in figuring how to put that circuit together, you probably should NOT be doing an engine swap.

[This message has been edited by Mickey_Moose (edited 02-04-2007).]

quote Originally posted by Mickey_Moose: You can buy ALL those parts for less than a $1 total - and not to sound like a prick, but if you are having problems in figuring how to put that circuit together, you probably should NOT be doing an engine swap.

I think he said he was having a mechanic do the work.

Thanks Brian, for comming to my defense on this. Yes, I can not completely do an engine swap, but my mechanic and I can.

So the circuit of the capacitor and the 2 resistors is the "clamp circuit" that sets the speedo input voltage at a usable value?
How does one adjust for different tire sizes? Does this have to be done in the ECM?
Dave

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Daviero - 88 N* GT

quote Originally posted by Daviero: So the circuit of the capacitor and the 2 resistors is the "clamp circuit" that sets the speedo input voltage at a usable value? How does one adjust for different tire sizes? Does this have to be done in the ECM? Dave

Yes, that simple circuit just clamps the voltage.

[This message has been edited by jscott1 (edited 03-21-2007).]

quote Originally posted by Daviero: How does one adjust for different tire sizes? Does this have to be done in the ECM? Dave

The tire size is programmed in the ECM, if you can get a hold of Rockcrawl he can program you ECM memcal for what ever tire size you are using plus a few other changes to the code for use in the Fiero. The other option is to contact PBJ and he can copy the program over for use using Rockcrawls setup.

There is another fellow on here as well, Aaron Russel, but I 'think' he only does ECM that have been wired as a Seville (I could be wrong).

quote Originally posted by Mickey_Moose: The tire size is programmed in the ECM,

Okay, I changed my post, but I would still try to keep the overall tire size the same.