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max speed when running big tyres and standard 1.3
https://auszookers.com/forum/viewtopic.php?f=5&t=50138		 Page 1 of 1
Author:  AndySierra98 [ Tue May 19, 2015 8:56 am ]
Post subject:  max speed when running big tyres and standard 1.3
hey guys, just wondering what speeds you get out of your sierras that are running a standard 1.3L engine with bigger tyres. and how you went about it. i have a SJ80 sierra with a 2 inch lift and standard engine and extractors. and stock tyres cheers
Author:  jdk81 [ Tue May 19, 2015 9:02 am ]
Post subject:  Re: max speed when running big tyres and standard 1.3
You can do 110/km/h with 31 on stock transfer gears, in 1.3L leafy - but it's super harsh on engine
Get some transfer gearing.

It depends on hills, headwinds and how heavy you run.

A better question, would be what's the biggest tyres you can reliably run on coily front diff before limited by the coily shittyness
Author:  Gwagensteve [ Tue May 19, 2015 9:36 am ]
Post subject:  Re: max speed when running big tyres and standard 1.3
The trolley tug used to have no problem at 100km/h on 35.5" swampers. It's all in the gearing.
Author:  AndySierra98 [ Tue May 19, 2015 10:02 am ]
Post subject:  Re: max speed when running big tyres and standard 1.3
How do i go about gearing it to get more speed out of it ?
Author:  Gwagensteve [ Tue May 19, 2015 10:09 am ]
Post subject:  Re: max speed when running big tyres and standard 1.3
You're asking the wrong question. The question is "I have xx sized tyres. How do I gear the car back to standard"
As you have a coil Sierra, you will need to swap to a leaf sierra transfer case. These have a 1.409 or 1.58 high range, which is about 7% and 12% reduction over your chain drive case. From that point you can swap to reduction gears to offset even larger tyres.

There are no alternative diff gears for your model. All reduction needs to be in the transfer case.

Steve.
Author:  Jezza86 [ Tue May 19, 2015 10:36 am ]
Post subject:  Re: max speed when running big tyres and standard 1.3
custom geared portals.
Author:  alien [ Tue May 19, 2015 10:38 am ]
Post subject:  Re: max speed when running big tyres and standard 1.3
When mine was still a 1.3L and running 215/75r15 tyres, extractors with 1.5" pipe and 2" lift I had no problem getting the needle off the speedo (about where 160km/hr would sit if it were on there). If your engine is tired that's a very likely cause for your current setup not getting you up to speed... no amount of gearing is going to help a worn engine =) lol
Author:  MrRocky [ Tue May 19, 2015 10:48 am ]
Post subject:  Re: max speed when running big tyres and standard 1.3
Depends on the wind ;)
Author:  AndySierra98 [ Tue May 19, 2015 12:00 pm ]
Post subject:  Re: max speed when running big tyres and standard 1.3
your telling me you got a sierra to 160km/hr?.... mine does 120 max and thats scary
Author:  Marko_SJ [ Tue May 19, 2015 12:15 pm ]
Post subject:  Re: max speed when running big tyres and standard 1.3
When I first got mine I got it to about 130 or so, downhill with 4 people in the car :lol:
Author:  alien [ Tue May 19, 2015 1:29 pm ]
Post subject:  Re: max speed when running big tyres and standard 1.3
AndySierra98 wrote:
your telling me you got a sierra to 160km/hr?.... mine does 120 max and thats scary


Well, I can't confirm that speed... as it was off the speedo and I was running larger tyres... but i got a speeding fine for 134km/hr in a 90 zone about 500m later (I was slowing down because there's often a camera in that area) lol

I've had my current setup at a confirmed 141km/hr (on the GPS) at 5200rpm. Not sure about everyone else's sierras but mines more stable / drives nicer at 110km/hr+ than it is at 100km/hr.
Author:  pezz [ Fri May 22, 2015 8:00 pm ]
Post subject:  Re: max speed when running big tyres and standard 1.3
mine sits on 100 on 33's as long as its flat road and no headwind
Author:  Red89 [ Fri May 22, 2015 9:13 pm ]
Post subject:  Re: max speed when running big tyres and standard 1.3
80ish kph flat to the boards on 38's on the flat with no wind at all and enough room to wind the hampster up. Mine was geared fairly low though.
Author:  madmacca [ Fri May 22, 2015 11:35 pm ]
Post subject:  Re: max speed when running big tyres and standard 1.3
Red89 wrote:
80ish kph flat to the boards on 38's on the flat with no wind at all and enough room to wind the hampster up. Mine was geared fairly low though.

:) will have to have a drag race with the new set up in yours sometime
Author:  Red89 [ Sun May 24, 2015 8:10 pm ]
Post subject:  Re: max speed when running big tyres and standard 1.3
madmacca wrote:
Red89 wrote:
80ish kph flat to the boards on 38's on the flat with no wind at all and enough room to wind the hampster up. Mine was geared fairly low though.

:) will have to have a drag race with the new set up in yours sometime

Sure will, with the bigger swaybar in it it handles really well flat out on the speed section now.
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