Jump to content
SAU Community

R32 gtst speedo out by 10kph

Kyer32

By Kyer32,
in General Maintenance

 Share

Recommended Posts

Duncan Grand Master

Duncan

Posted
Posted

It is normal for a speedo to read 0-10% high (unfortunately), intended by manufacturers and ADRs (although not in this case) to ensure your speedo does not read low if your tyres are worn.

Speaking of which, what size tyres do you have on the rear, and what does they tyre placard say you should have? you can use this https://tiresize.com/calculator/ to determine what % difference that is causing

Personally, when I buy tyres for a car I buy a size that will bring the speedo back to being more accurate; it if it reads 5% high I buy tyres that are 5% larger diameter. If you had an electronic speed sender like R33 onwards, the other option is to add a speedo adjuster but that won't work in R32. Finally, you  might be able to find a different sized gear for the speedo sender but that will be limited to what already exists (and I don't know what sizes do)

GTSBoy Grand Master

GTSBoy

Posted
Posted
7 hours ago, Kyer32 said:

so I need a new speedo cable 

Nope.

The seal is in the drive. A new cable would just fill up and continue to convey oil to the speedo head.

To check if this is what is happening, take the cluster out, dismantle the speedo and have a look. You probably don't even have to dismantle it. If there is oil coming up the cable, the drive into the speedo will be grossly greasy.

I had to manually (and delicately) clean the gunk out of my speedo.

Kyer32 Rookie

Kyer32

Posted
  • Author
Posted
On 8/1/2025 at 6:29 AM, Duncan said:

It is normal for a speedo to read 0-10% high (unfortunately), intended by manufacturers and ADRs (although not in this case) to ensure your speedo does not read low if your tyres are worn.

Speaking of which, what size tyres do you have on the rear, and what does they tyre placard say you should have? you can use this https://tiresize.com/calculator/ to determine what % difference that is causing

Personally, when I buy tyres for a car I buy a size that will bring the speedo back to being more accurate; it if it reads 5% high I buy tyres that are 5% larger diameter. If you had an electronic speed sender like R33 onwards, the other option is to add a speedo adjuster but that won't work in R32. Finally, you  might be able to find a different sized gear for the speedo sender but that will be limited to what already exists (and I don't know what sizes do)

 

1 minute ago, Kyer32 said:

My tyres are 215/45/r17 the 32 is a type m

 

Kyer32 Rookie

Kyer32

Posted
  • Author
Posted
On 8/1/2025 at 7:21 AM, GTSBoy said:

Nope.

The seal is in the drive. A new cable would just fill up and continue to convey oil to the speedo head.

To check if this is what is happening, take the cluster out, dismantle the speedo and have a look. You probably don't even have to dismantle it. If there is oil coming up the cable, the drive into the speedo will be grossly greasy.

I had to manually (and delicately) clean the gunk out of my speedo.

So if anything it’s be the seal speedo drive sorry it’s being awhile since I worked on one of these is the drive connected to the gearbox or behind the cluster 

PLYNX Mentor

PLYNX

Posted
Posted

Yep ! 

Cluster out first.

Dismantle.

Check for oil grease. If oil and grease = clean.

Then check seal at the drive coming from the gearbox. 

Seal broken  = change seal.

Doing it the other way around it will again push grease/oil back into the cluster and then your gonna have to do the cluster clean all over again !

 

Kyer32 Rookie

Kyer32

Posted
  • Author
Posted
On 7/1/2025 at 11:26 PM, GTSBoy said:

I would guess the seal has gone down at the speedo drive and gearbox oil has crept up the drive cable sheath and fouled the speedo head.

 

On 7/1/2025 at 11:32 PM, niZmO_Man said:

Your car was auto before? You have different diff ratio (auto vs manual i think? or n/a and turbo?)

 

1 minute ago, MBS206 said:

What makes you guess that tyre size specifically?

Just tried researching factory type m spec that’s all I can find 

niZmO_Man Grand Master

niZmO_Man

Posted
Posted

Search for your VIN in gtr-registry.com and see what it left with from factory. There's 4.3:1 and 4.11:1 diff ratios IIRC, can't remember what models had what.

Also could be tyre size, by factory the speedo reads a tad quicker >80 km/h but constantly out be 10 km/h is weird.

Maybe someone wound the odometer back, and accidentally bumped the needle up?

Kyer32 Rookie

Kyer32

Posted
  • Author
Posted
1 hour ago, niZmO_Man said:

Search for your VIN in gtr-registry.com and see what it left with from factory. There's 4.3:1 and 4.11:1 diff ratios IIRC, can't remember what models had what.

Also could be tyre size, by factory the speedo reads a tad quicker >80 km/h but constantly out be 10 km/h is weird.

Maybe someone wound the odometer back, and accidentally bumped the needle up?

Well found out it’s a 60th anniversary gtst from that it came with 205-55r15

-Jimmy- Mentor

-Jimmy-

Posted
Posted

Interesting, I haven't read about the issue with oil getting into the speedo in the cluster before. I'll have to take more notice with mine.

The speedo on my R32's when I've run factory diff and tyre size have never been accurate as far as I can remember.

On 1/12/2025 at 9:44 PM, GTSBoy said:

No R32 GTSt had 15" wheels. 205/55-16 was standard GTSt fare.

4.36:1 is standard R32 turbo auto diff. I think the manual was too, not 4.11.

4.11 and 4.08 were R33 namual and auto respectively.

The non Type-M GTS-t did come with 15" 5 stud wheels and smaller brakes, but that's less than 5% of them. :)

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • PranK
      Chris' Toyota Mark ii JZX110

      By PranK · Posted

      This looks great! Awesome to have the 5 speed with an LSD in this. The Recaro's look like SR2's or SR3's. It's a shame they've been retrimmed as they would have looked sweet in their original colours. I think I'd want my agent to be a little more up front and informative too. I've never imported but I reckon it would make me a little nervous, so the more info the better.
    • soviet_merlin
      Duncan's V37.......race car?

      By soviet_merlin · Posted

      Thanks for doing that Duncan! Makes you a good person in my books. We don't get kangaroos or wombats here. But we have bats and it's similar. AFAIK it's often the mums with a baby attached that get hit because they drop lower when starting from a tree. If you hit an animal, check on it. https://www.ifaw.org/au/resources/wildlife-rescue-app An app to get the closest wildlife rescue contact.
    • Murray_Calavera
      Jacks that fit under GTR lips that can reach the subframe?

      By Murray_Calavera · Posted

      My dream is also to have a proper hoist, but I don't think it will ever happen. My quickjack is probably as close as I'll ever get, it really is very good though. 
    • Duncan
      Duncan's V37.......race car?

      By Duncan · Posted

      Yeah we keep on in the dailies, it is pretty poor how many animals get hit and the driver leaves without checking....have saved a couple of little ones over the years. Bit of a gruesome job though, pouches generally need to be cut open because they are so tight and often the joey doesn't realise mum is gone so they are still locked onto the teat. I checked the modules in front of the DS wheel where an oil cooler should go.... There is the radar unit - that can go for race use) One of the 2 HX water pumps, the silver cylinder. That needs to be kept but might be able to be relocated But the bad news, the big computer mounted vertically in front of the wheel (blocking any potential air exit) is the electric steering computer. That is required until/unless i do a hydraulic steering conversion, and in CAD based modern car design it is not like I can just pop a big unit like that somewhere else (plus the loom would be too short anywhere else too). So, the passenger side is OK to clear out (just use a smaller washer reservoir, potentially elsewhere), but the DS no beuno
    • Duncan
      Chris' Toyota Mark ii JZX110

      By Duncan · Posted

      Well, all the best with the new camry It was interesting to hear about the UK process, it is generally a lot more streamlined here with a shipping agent looking after all the import side (noting the exact final price can still be a surprise.....) and I've used a few different brokers on the japan (or US) side, and never had any trouble with any of them....luck of the draw I guess. You mentioned you didn't get the auction sheet (understandable since you bought it from a dealer, not auction), but I always try and get hold of that because they are pretty thorough. I've imported 2x R grade vehicles over the years and both were fine, repairs in Japan are pretty thorough compared to here in Oz.
×
×
  • Create New...