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Suppliers/Dealers or anyone selling with a commercial view in mind CANNOT post here unless responding to a specific request of a member in a "wanted" post.
Suppliers include people "breaking for spares" on a regular basis, when purchasing spares members should ask a supplier what they contribute to the running of the forum particularly if contacted by a Private Message
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Supercharger for Gen 4's
28 Jul 2021 08:01 #237069
by Soeley
Black 2019 Jimny SZ5
www.bigjimny.com/index.php/forum/8-my-ji...ley-s-2019-black-sz5
Replied by Soeley on topic Supercharger for Gen 4's
How have they got an extra 50 horses without remapping? I wonder how long the engine/transmission will last compared to standard?
Black 2019 Jimny SZ5
www.bigjimny.com/index.php/forum/8-my-ji...ley-s-2019-black-sz5
28 Jul 2021 08:22 #237072
by 300bhpton
Supercharger type will dictate how the power curve looks. A centrifugal blower is a big snail shell design and looks like a large turbocharger, only being belt driven. These are 100% rpm dependant, so they will make less boost when being spun slowly and in theory will continue to make more and more power the faster you spin it. Offering bigger gains at high rpm.
Positive Displacement (PD) blowers such as Roots or Twin Screws have the ability to make full boost just off idle and will give the low end fat torque curve. But roots blowers are less efficient as a rule, so will make less Peak power. And often drop a bit of boost at high rpm. Twin screws are more efficient and tend to hand on better at high rpm. But will still be behind a good centrifugal blower on Peak power.
Personally I'm of the mind that a PD blower would suit something like the Jimny more so. But I'm not sure there is anyone looking at building a kit using these.
Replied by 300bhpton on topic Re:Supercharger for Gen 4's
Interesting. Not a lot gained at the bottom end, but the supercharger keeps the torque rising where the standard engine plateaus at 3,500rpm, leading to a big difference at the red line. This will really change how the engine feels above 3,500rpm. Worthwhile for people that are finding the engine a bit flat at higher RPM.
Supercharger type will dictate how the power curve looks. A centrifugal blower is a big snail shell design and looks like a large turbocharger, only being belt driven. These are 100% rpm dependant, so they will make less boost when being spun slowly and in theory will continue to make more and more power the faster you spin it. Offering bigger gains at high rpm.
Positive Displacement (PD) blowers such as Roots or Twin Screws have the ability to make full boost just off idle and will give the low end fat torque curve. But roots blowers are less efficient as a rule, so will make less Peak power. And often drop a bit of boost at high rpm. Twin screws are more efficient and tend to hand on better at high rpm. But will still be behind a good centrifugal blower on Peak power.
Personally I'm of the mind that a PD blower would suit something like the Jimny more so. But I'm not sure there is anyone looking at building a kit using these.
- Roger Fairclough
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