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| Gearing and RPM's https://auszookers.com/forum/viewtopic.php?f=5&t=53219 |
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| Author: | cyprus73 [ Tue Sep 13, 2016 5:39 pm ] |
| Post subject: | Gearing and RPM's |
Hi all. I just got it back My Suzuki Sierra 88 WT back from the tuner, it is running a 1.6 with 32/36 weber, extractors and 29" tires, 3.7 diff ratios. Was sitting on 100km/h at 4000RPM. With the tire change i know the speed would be out and that would be about 110km Thing the RPM's are high and was looking at what I can do the fit it without going back to the 26" Thks Chris |
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| Author: | bumstein [ Tue Sep 13, 2016 6:06 pm ] |
| Post subject: | Re: Gearing and RPM's |
What size tyres are you running? If your lookin at dropping the revs you need to increase tyre size, not decrease it. Are you running reduction gears in your transfer? |
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| Author: | jdk81 [ Tue Sep 13, 2016 6:30 pm ] |
| Post subject: | Re: Gearing and RPM's |
Tried 5th gear? |
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| Author: | MrRocky [ Tue Sep 13, 2016 6:33 pm ] |
| Post subject: | Re: Gearing and RPM's |
Nothing wrong with 4000rpm at 110 In fact id say its spot on |
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| Author: | Reubs [ Tue Sep 13, 2016 6:51 pm ] |
| Post subject: | Re: Gearing and RPM's |
Stock Coil Sierras run 4000RPM at 110hm/h. Perfect. |
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| Author: | shep [ Tue Sep 13, 2016 6:56 pm ] |
| Post subject: | Re: Gearing and RPM's |
My jimny does 4150@100kph and I am about to set off on its third half lap of oz. |
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| Author: | cyprus73 [ Tue Sep 13, 2016 9:29 pm ] |
| Post subject: | Re: Gearing and RPM's |
Hi all. 29" tires. Don't believe it has gear ruduction In the transfer. That was 5 th gear lol |
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| Author: | alien [ Tue Sep 13, 2016 10:08 pm ] |
| Post subject: | Re: Gearing and RPM's |
My WT sierra with 31's and 5.14 tcase gears with 1.6efi turns about 3100rpm at 90km/hr in 5th. I do know that at 5200rpm i'm doing 141km/hr (GPS confirmed rather than speedo). It's been ages since i sat on 110 so i'm unsure what my RPM would be there, but maybe the above will help. Maybe you've got the switched NT tcase which is giving you some more reduction? |
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| Author: | jdk81 [ Wed Sep 14, 2016 6:57 am ] |
| Post subject: | Re: Gearing and RPM's |
Provided it is 4000 rpm or so at 100 km/h by gps and you are in 5th with 29" tyres. Perhaps it has 5.12 diff gears, or possibly (less likely) a combination of xfer and vitara/gv diff gears. |
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| Author: | tanshi [ Wed Sep 14, 2016 8:09 am ] |
| Post subject: | Re: Gearing and RPM's |
yeah as i told you on facebook those revs arent right for the gearing you think you have. so you are either going faster than you think or some where your gearing is different. a 1 litre transfer case and doing 115 kmh would come close to what your seeing rev wise |
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| Author: | MrRocky [ Wed Sep 14, 2016 8:17 am ] |
| Post subject: | Re: Gearing and RPM's |
Yeah u gotta use gps to check speed Mines nearly 15 km out at 110 |
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| Author: | Gwagensteve [ Wed Sep 14, 2016 8:59 am ] |
| Post subject: | Re: Gearing and RPM's |
Yep, gearing is not standard. |
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| Author: | Gwagensteve [ Wed Sep 14, 2016 9:33 am ] |
| Post subject: | Re: Gearing and RPM's |
It gearing was standard revs would be 3265 |
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| Author: | cyprus73 [ Wed Sep 14, 2016 9:41 am ] |
| Post subject: | Re: Gearing and RPM's |
Hi All. Appreciated your feed back. I can confirm that the diff ratio is 3.7 as I changed them recently as the original ones had shit themselves. The transfer case is another thing. Not sure what previous own did there. Ill gps the speed and get back to you all. Thks. |
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| Author: | alien [ Wed Sep 14, 2016 10:11 am ] |
| Post subject: | Re: Gearing and RPM's |
Just stick 31's on it and call it good =) lol |
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| Author: | Gwagensteve [ Wed Sep 14, 2016 10:11 am ] |
| Post subject: | Re: Gearing and RPM's |
you have a 1.0 transfer or 4.1 transfer gears. If you're reported speed and revs are accurate. |
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| Author: | alien [ Wed Sep 14, 2016 2:22 pm ] |
| Post subject: | Re: Gearing and RPM's |
Low range RPM and speed figures would identify if it's got 4.1 tcase gears or not. |
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| Author: | Gwagensteve [ Wed Sep 14, 2016 4:37 pm ] |
| Post subject: | Re: Gearing and RPM's |
Hmm, in front of my gearing calculator. You were seeing 4000rpm at an indicated 100km/h on the speedo, yes? (not actual road speed measured with a GPS?) That means tyre size and diff gears aren't relevant. The only thing that changes the ratio of speedo reading to engine revs are transfer gears. With my calculator, it looks like you have 6.5:1 transfer gears in the car. I get 4070rpm@100km/h shown on the speedo with 6.5:1 transfer gears in the car. With your tyres in the mix (assuming they are actually 29") revs at an actual 100km/h will be 3645rpm which is pretty much spot on. you can check this easily. Put the car in 4L. Leave the front hubs unlocked. Jack one rear wheel off the ground (assuming you don't have an auto locker or spool). chock the other wheels. Turn the front or rear driveshaft 1 turn. The input shaft from the gearbox to the transfer should turn 6.5 times. These calculations are only valid if you're talking about speedo reading and not speed via GPS. If it's actual road speed you have even more gearing reduction so the diffs couldn't be 3.7. |
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| Author: | cyprus73 [ Thu Sep 15, 2016 12:37 pm ] |
| Post subject: | Re: Gearing and RPM's |
Hi. These were speedo reading of 100km tacho around 4000rpm and tires are 255/70/15 which makes them about 29.1" I guess its a bonus that it has gear reduction. Wasn't told it had them when i purchased the car about 6 months ago. Appreciate all you info, especially you Steve you've been a great help. Chris. |
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| Author: | MrRocky [ Thu Sep 15, 2016 3:09 pm ] |
| Post subject: | Re: Gearing and RPM's |
Get a gps on that bad boy your speedo at 100 is in reality prob closer to 110/115 |
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| Author: | vet 180 [ Sun Sep 18, 2016 3:36 am ] |
| Post subject: | Re: Gearing and RPM's |
cyprus73 wrote: Hi. These were speedo reading of 100km tacho around 4000rpm and tires are 255/70/15 which makes them about 29.1" I guess its a bonus that it has gear reduction. Wasn't told it had them when i purchased the car about 6 months ago. Appreciate all you info, especially you Steve you've been a great help. Chris. Throw on a set of 31's and call it a day |
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