2 different styles of oem boost gauges

[PaulieB]

I remember Dennis mentioning this. Did a little search, and voila.

https://www.kirbanperformance.com/news/455/04-05-2017+Inner+Circle.html

 

[grass doctor]

strange because the 0-5-10-15 came out of 86 T-type
maybe the 86 GN had the 0-15 ones

 

[PaulieB]

I think it was simply a case of GM sourcing their parts from different suppliers. I’d bet that if you looked hard enough, you’d find that they used both types in Turbo Regals of any flavor in both ‘86 and ‘87.

 

[grass doctor]

just looked an some 86 GN's and the ones I saw had 0-5-10-15
dammit no rhyme or reason to this

 

[grass doctor]

I have yet to see another 0-15 very rare I hope
or only put in select cars maybe limiteds or WH-1 or 85's

 

[PaulieB]

Exactly my point. They were mass produced automobiles. Whatever was in the TR dash parts bin as the car came down the line is what got installed. I’m guessing the 0- 15’s were a little used substitute.

 

[forcefed3.8's]

I have yet to see another 0-15 very rare I hope
or only put in select cars maybe limiteds or WH-1 or 85's

I think you are stressing over nothing.

 

[ScottHeidinger]

They aren’t that rare.


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[grass doctor]

what's that in Scott or what it come out of

 

[ScottHeidinger]

Stock gauge from my 86 T-Type


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[grass doctor]

I think you are stressing over nothing.

just trying to figure out if there is a correct model or year they were suppose to be in ,looks like no real reason or continuity to why some cars got different ones, maybe just a certain period on the production line ooh well
thx for input

 

[forcefed3.8's]

I assumed the changed happened from 85 to 86, but it looks more random than that. I havent really paid attention to the cars I work on, just figured 86 and 87 had 0 5 10 15

 

[1986 Buick GX1]

I think you are stressing over nothing.

^^ x2

Can't trust them anyway.
My digital dash yellow light comes on at 2 psi. boost and the red light comes on at 7 psi. Man I thought I was flying.

 

[b4black]

Regardless of the scaling, they have just two lights, correct?

(It's the same pressure switch that was used in 1981-1983 Turbo Regals.)

 

[ScottHeidinger]

Yes the digital gauges have just 2 separate lights. One yellow and one red.


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[Anthony P]

Trying to figure out the timeline on the powermaster vs hydroboost, 20 bolt vs 14 bolt and wide radiator. I assumed all hot airs had the narrow radiator until i saw a coworkers 85, it had the wide radiator, 20 bolt block and powermaster.

the NOS hot air crate engines I have are 140 blocks, 20 bolt oil pans, produced at Flint engine assembly March 9th and 10th 1985. engine serial # as pictured from valve cover tag for 5NDA-010.

 

[Anthony P]

this 85 GN has the 0 and 15 format. since it sold, ad shows no VIN so I can't attempt to research my build records file for a build date...

https://mcecars.com/vehicles/22/1985-buick-grand-national

remember the 84-85 turbo riviera's used the same cluster as turbo regals. this 85 turbo riv also has the 0 and 15 format, column shift

https://www.streetsideclassics.com/vehicles/0082-tpa/1985-buick-riviera-convertible

remember the earliest 1986 model year turbo buicks produced, beginning in August 1985 had last six of VIN that began with 200000 not the typical later last six beginning with 400000. early 86 SPIDs had the clear tape over the label - just like the 85 model year. the later 1986 400000 vin sequence used the same SPID label blank as the 1987 models.

I'm thinking this boost gauge thing is tied to the VIN sequence but I'm not 100% on that yet. I don't have a cut-off date of the 200000 last six VIN for early 86. I kept records of VIN's and SPID's not pictures of the dash.

the short story is that 1986 model year was a transition year with a lot of stuff happening on the fly as the build-up for 1987 model year production approached. AND the end of production for RWD and G-body at Pontiac, MI assembly plant...


I'm thinking the early 86 model year builds with a VIN ending in 2xxxxx were still using up leftover 85 model year stuff. remember, this (1986) is the changeover to the LC2 intercooled engine. at some point, the standardization for 1986 dash was implemented as the buildup for 1987 models approached using the 0 5 10 15 format.

1985 VINs have last six as 4xxxxx. SPID samples below



1986 VINs last six 2xxxxx also had SPIDs with the clear tape overlay and no representation of the build # on top line next to VIN. SPID label blank was same part # as 1985 models.



at some point in model year 1986, last six VIN sequence converted to 4xxxxx; SPIDs still had tape overlay and no build number. SPID label has same part # as 1985 models.



even later in model year 1986; the SPIDs were converted to the 1987 format - no tape overlay, build # on top line. New part # for SPID label blank - the 1987 model year part # is now in effect for these remaining 1986 model builds.



At some point, GM decided to change to the 0 5 10 15 format for the 1987 model year production and released that change for the remaining 1986 model year production (and inventory buildup) once the leftover production inventory of 1985 0 15 gauge plates were depleted. Production inventory depletion, not service parts inventory.

I'm thinking this happened for the VIN change from ending in 2xxxxx to ending in 4xxxxx. I don't have an exact date when that happened.

 

[grass doctor]

thx Anthony P
jedi master