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Stupid Question?

I have no plans to exceed 155MPH that I understand is the top end of a STOCK 370, but Since I’ve added a few mods and a tune, I’m assuming

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Old 05-05-2019, 05:09 PM   #1 (permalink)
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Default Stupid Question?

I have no plans to exceed 155MPH that I understand is the top end of a STOCK 370, but Since I’ve added a few mods and a tune, I’m assuming my top end should be higher, no?

So my question... is top end still throttled at 155MPH or does the tune negate that?
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Old 05-05-2019, 05:53 PM   #2 (permalink)
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Originally Posted by MZ DAIZY View Post
I have no plans to exceed 155MPH that I understand is the top end of a STOCK 370, but Since I’ve added a few mods and a tune, I’m assuming my top end should be higher, no?

So my question... is top end still throttled at 155MPH or does the tune negate that?
You would have to ask your tuner.
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Old 05-05-2019, 06:18 PM   #3 (permalink)
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If it’s tuned, more than likely it’s now limited by the gearing. IE redline in 6th gear, after factoring in your power to weight ratio.

In other words, you’re now mechanically speed limited instead of electronically.
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Old 05-05-2019, 06:25 PM   #4 (permalink)
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Originally Posted by Sway View Post
If it’s tuned, more than likely it’s now limited by the gearing. IE redline in 6th gear, after factoring in your power to weight ratio.

In other words, you’re now mechanically speed limited instead of electronically.
That makes sense. Thanks!
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Old 05-05-2019, 06:26 PM   #5 (permalink)
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Hope these help.


My Topspeed and Robtuned Experience


Top speed??


Z limited at 250km/h
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Old 05-05-2019, 07:18 PM   #6 (permalink)
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I’m going to have to call Z1 and ask. Not really important, I’m just curious. Also curious what happens to tune if battery goes bad or gets disconnected...
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Old 05-05-2019, 07:49 PM   #7 (permalink)
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I’m going to have to call Z1 and ask. Not really important, I’m just curious. Also curious what happens to tune if battery goes bad or gets disconnected...
Nothing, it’s stored in the ECU. Only your cache or temporary data is reset when disconnecting the battery.

I’ve disconnected my battery many times since my tune, today included before doing my throttle position reset.
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Old 05-05-2019, 10:10 PM   #8 (permalink)
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Stock is limited to 155 mph by the ECU. Any tuner can raise it. Plus limited to about the same speed because of aero with the stock HP.
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Old 05-06-2019, 01:14 AM   #9 (permalink)
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Assuming that you can overcome aerodynamic drag (which isn't always a good assumption to make) then top speed is just a math equation involving redline rpm (which is also tunable), sixth gear ratio and tire size
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Old 05-06-2019, 05:04 PM   #10 (permalink)
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If anyone at home is keeping score, I called Z1 today and yes, they raised the governor to 200 MPH and the Rev limiter is 7800 RPM’s.
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