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89 GPrix Heads up Display in a Fiero by Mike Murphy
Started on: 09-21-2006 09:47 AM
Replies: 7
Last post by: Mike Murphy on 09-21-2006 03:43 PM
Mike Murphy
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Report this Post09-21-2006 09:47 AM Click Here to See the Profile for Mike MurphyClick Here to Email Mike MurphySend a Private Message to Mike MurphyDirect Link to This Post
Who has done it? How did you do it? Do you need to be a rocket scientist?

I've got the unit out of an 89-90 GP Turbo I would like to use.
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darkhorizon
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Report this Post09-21-2006 09:51 AM Click Here to See the Profile for darkhorizonSend a Private Message to darkhorizonDirect Link to This Post
I cant say much other than that it has been done before.

Hooking it up isnt the hard part from what I understand.
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3800superfast
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jscott1
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Report this Post09-21-2006 10:59 AM Click Here to See the Profile for jscott1Send a Private Message to jscott1Direct Link to This Post
What part of it are you trying to figure out? The wiring is easy. Mounting it is the hard part. You are not going to find any place in the stock dash to mount a hud.

I have a bonneville HUD in my firebird dash in my fiero. But it's aimed for me, and it's not easy to adjust it for any other person.






The only tricky part is the VSS input on the HUD is expecting a 4000 pulse per mile signal, (buffered square wave). Only the 88 Fiero has that output since it was provided to drive the Electro-hydraulic power steering. On an 84-87 you would have to use the raw output of the VSS which is a 4000 pulse per mile sine wave. I've never tried that but from what I hear it can be erratic at low speeds.

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TG oreiF 8891
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Report this Post09-21-2006 01:38 PM Click Here to See the Profile for TG oreiF 8891Click Here to Email TG oreiF 8891Send a Private Message to TG oreiF 8891Direct Link to This Post
 
quote
Originally posted by jscott1:

Only the 88 Fiero has that output since it was provided to drive the Electro-hydraulic power steering.


Can you tell me which connector and pin has the square wave on an 88?

Thanks.
Edit: C1/M as mentioned above? Can you explain what that means to a novice, I've had the dash all apart and done the temp guage fix, but don't exactly know (or remember) which connector is which and how they are named.

[This message has been edited by TG oreiF 8891 (edited 09-21-2006).]

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jscott1
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Report this Post09-21-2006 02:10 PM Click Here to See the Profile for jscott1Send a Private Message to jscott1Direct Link to This Post
The Fiero cluster that three connectors. The one on the left side, (facing forward) underneath the cluster plugs directly into the speedometer board. That connector has an "M" pin that is only on the 88 that has the square wave on it.

Some say the "N" pin also has it, but that is not my experience. I have found the 4000 ppm on the GT boards, but I had to probe around for it. I have not found it on the 4 cylinder boards at all.



As for the speedometer board (84 non cruise, 85-88):

A - not used
B - not used

C - not used
D - not used
E - not used
F - not used

G - not used
H - not used
J - not used

K - not used
L - not used
M - 4000 pulse per mile buffered VSS (88 only)

N - 4000 pulse per mile buffered VSS (86-87) ?? per Gary W
P - black/white - ground
R - puple/white - from the VSS (low)
S - Yellow - from the VSS (high)

T - yellow/black - Ignition power to cluster
U - Dark green/white - 2000 pulse per mile Vehicle speed sensor signal to ECM and Cruise


I hope that helps??

- Jonathan

[This message has been edited by jscott1 (edited 09-21-2006).]

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87convert
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Report this Post09-21-2006 02:52 PM Click Here to See the Profile for 87convertSend a Private Message to 87convertDirect Link to This Post
I initialy planned to use this HUD but went to the later versions because they are more compact. The 89-90 version is fairly long doesn't fit well into the Fiero dash.

Rolland
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Mike Murphy
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Report this Post09-21-2006 03:43 PM Click Here to See the Profile for Mike MurphyClick Here to Email Mike MurphySend a Private Message to Mike MurphyDirect Link to This Post
Yeah the size of it is a problem. I think I may just use this one in my Trans Sport as the dash is pretty close to a GP anyway and then try another more compact unit for the Fiero. But the massive windsheild in the Trans Sport may not work well either.
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