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Cruising revs 1 litre sierra
https://auszookers.com/forum/viewtopic.php?f=5&t=52486
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Author:  Ozooker [ Mon May 16, 2016 7:17 am ]
Post subject:  Cruising revs 1 litre sierra

Hello all, I was wondering what revs the 1 litre sierras run at when going say 100kmph and 50kmph (3rd).

I've installed an aftermarket tachometer and I'm unsure whether it is reading correctly (say 7500rpm for 100kmph and about 5000 for 50kmph, I'm unsure though, I'll have to check at a later time.) does the 1 litre actually perform at those high revs or is there something up?

Your input is appreciated.

Author:  Gwagensteve [ Mon May 16, 2016 8:13 am ]
Post subject:  Re: Cruising revs 1 litre sierra

From memory 1.0 cruise at 5200rpm @100

Steve.

Author:  Gwagensteve [ Mon May 16, 2016 8:17 am ]
Post subject:  Re: Cruising revs 1 litre sierra

Just re-crunched the numbers and that is correct.
In 4th at 50km/h then revs would be 2600.

Author:  Ozooker [ Mon May 16, 2016 11:09 am ]
Post subject:  Re: Cruising revs 1 litre sierra

Thanks, I must've wired the tacho up wrong then, any ideas of how to fix/adjust it to make it read correctly?

Author:  Ozooker [ Mon May 16, 2016 11:27 am ]
Post subject:  Re: Cruising revs 1 litre sierra

Thanks for that, so what could I do to fix the incorrect reading,

Author:  Gwagensteve [ Mon May 16, 2016 12:23 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

No sorry, can't help there.

Author:  Reubs [ Mon May 16, 2016 12:43 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

Tacho set for 6cyl instead of 4?

Author:  henno [ Mon May 16, 2016 2:23 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

Reubs wrote:
Tacho set for 6cyl instead of 4?


That would show as less RPM, not more.

Author:  tanshi [ Mon May 16, 2016 2:37 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

in your original post you mention (3rd) as in 100kmph and 50kmph (3rd). are you refering to doing 100kmph and 50kmph in third gear because 100 in third gear is about 7300rpm.

if this is the case change into fourth and you will be doing 5100rpm

I have a friends car who runs a 1 litre in his lj and its happy at nearly 6000 at 1000 and will rev regularly out to 9000+

Author:  watermouse [ Mon May 16, 2016 3:15 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

tanshi, you are a smart bloke, check your second sentence again.

Author:  tanshi [ Mon May 16, 2016 3:44 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

lol yeah ok that's what I get for doing user creations at work. setting up iphones and selling ADD stuff all at once. while trying to respond to tech lol

Author:  MrRocky [ Mon May 16, 2016 6:46 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

My experience is they blow up cruising at high rpm over extended periods

Author:  rustyzook [ Mon May 16, 2016 7:46 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

My experience is they drop valves into the block running at high revs for extended periods.

With the tachometer when I put one in my old 1ltr I had to set it to 8cyl for it to read right, 100 in 4th was about 6200 (4.88 centres)

Author:  Ozooker [ Tue May 17, 2016 8:38 am ]
Post subject:  Re: Cruising revs 1 litre sierra

Oh sorry for the confusion, I was meaning what it ran at for 100km in fourth gear and what it ran at for 50km in 3rd, I have my tacho set for 4 cylinder so I'm guessing my wiring might be the problem.

Author:  jonno_racing [ Tue May 17, 2016 9:23 am ]
Post subject:  Re: Cruising revs 1 litre sierra

There a strong motor..
I had one drop the clip from a gudgen pin and the pin kind of ate the bore wall, it knocked kinda bad
Another had a big drink of mud at about 9000rpm.. amazingly it ran again. #1 piston was 5mm low..
And i have punished them for years

Author:  rustyzook [ Tue May 17, 2016 12:16 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

I hydro locked one of mine, changed oil and oil filter In it, it ran for years after roughly 80,000km before it dropped vales and totalled it. Another one just decided to drop vales for the hell of it. I did push them hard and not look after them. They are pretty strong I wouldn't see a Commodore v6 lasting as long as the F10a with the same treatment

Author:  MrRocky [ Tue May 17, 2016 1:38 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

They wear camshaft lobes rather bad without regular oil changes.
Id be reluctant to sit above 90 on the speedo if you intended on keeping the car for a while. Everyones gunna say they love the revs and they live forever but reality is they dont its just most people get fed up with 30kw of power and swap to a 1.3
I also dont think its physically possible to rev one to 9000rpm

Author:  tanshi [ Tue May 17, 2016 1:50 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

MrRocky wrote:
I also dont think its physically possible to rev one to 9000rpm


Seen it first hand, regularly.

Author:  rustyzook [ Tue May 17, 2016 5:01 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

tanshi wrote:
MrRocky wrote:
I also dont think its physically possible to rev one to 9000rpm


Seen it first hand, regularly.


they can and they do! again mine in 4th at 100 was over 6000

Author:  MrRocky [ Tue May 17, 2016 6:44 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

Haha anyone can set the tach wrong

Author:  Ozooker [ Tue May 17, 2016 7:40 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

Well considering the tacho only has five wires running to it, all hooked up to the right spots I doubt it's wired wrong. I would expect an accurate reading for a new $80 tacho.
I'll try and switch to different cylinders to see if I get a better reading.

Author:  MrRocky [ Tue May 17, 2016 8:26 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

Only needs signal from negative on the coil from memory
Brown wire

Author:  Ozooker [ Wed May 18, 2016 1:40 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

Is green wire on mine. No problem really I'll figure it out, if it's still not going to give me a good reading I'll let everyone know that Saas tachos aren't worthwhile haha.
Any electritions of sorts know if using a thicker gauge wire from the coil would affect reading?

Author:  Kor3y101 [ Wed May 18, 2016 3:27 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

Gonna throw this out there. Have you checked to make sure your earths are okay?

When I installed my Saas water temp gauge, I thought it was broken because it always read wrong and would act funny, but as soon as I put an earth from the body to the battery (as it was lacking this) it fixed 90% of my electrical issues in the car.

Author:  Ozooker [ Wed May 18, 2016 3:48 pm ]
Post subject:  Re: Cruising revs 1 litre sierra

Hmmm I haven't considered this, I figured if it lit up and everything then the earth would be fine, but I'll give it a try and see if that helps, thank you

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