Stupid Question?

MZ DAIZY · 05-05-2019, 04:09 PM

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?

Spooler · 05-05-2019, 04:53 PM

Quote:

Originally Posted by MZ DAIZY

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.

Sway · 05-05-2019, 05:18 PM

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.

MZ DAIZY · 05-05-2019, 05:25 PM

Quote:

Originally Posted by Sway

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!

cooltoy · 05-05-2019, 05:26 PM

Hope these help.

My Topspeed and Robtuned Experience

Top speed??

Z limited at 250km/h

MZ DAIZY · 05-05-2019, 06:18 PM

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...

Sway · 05-05-2019, 06:49 PM

Quote:

Originally Posted by MZ DAIZY

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.

Rusty · 05-05-2019, 09:10 PM

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.

dts3 · 05-06-2019, 12:14 AM

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

MZ DAIZY · 05-06-2019, 04:04 PM

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.

05-05-2019, 04:09 PM	#1 (permalink)
MZ DAIZY A True Z Fanatic Join Date: Feb 2018 Location: Atlanta Posts: 1,776 Drives: Miss Daisy Rep Power: 549977	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?

05-05-2019, 05:18 PM	#3 (permalink)
Sway Track Member Join Date: Sep 2012 Location: TX Posts: 697 Drives: 2018 GTR Rep Power: 37870	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. MZ DAIZY likes this. __________________ - White 2018 GTR FBO+E85 - Check out my old build thread: Sway’s Journal-Hitomi ~Live and let live!~

05-05-2019, 05:26 PM	#5 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,938 Drives: 14 PW 370Z S/T MT Rep Power: 240204	Hope these help. My Topspeed and Robtuned Experience Top speed?? Z limited at 250km/h MZ DAIZY likes this. __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

05-05-2019, 09:10 PM	#8 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,860 Drives: 2011 Nismo GM 6M Rep Power: 2684436	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. Felix 808 and MZ DAIZY like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

05-06-2019, 12:14 AM	#9 (permalink)
dts3 Track Member Join Date: May 2018 Location: Farmington Hills, MI Posts: 599 Drives: 08 Expedition Rep Power: 6764	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 MZ DAIZY likes this.

05-05-2019, 06:18 PM	#6 (permalink)
MZ DAIZY A True Z Fanatic Join Date: Feb 2018 Location: Atlanta Posts: 1,776 Drives: Miss Daisy Rep Power: 549977	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...

05-06-2019, 04:04 PM	#10 (permalink)
MZ DAIZY A True Z Fanatic Join Date: Feb 2018 Location: Atlanta Posts: 1,776 Drives: Miss Daisy Rep Power: 549977	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. dts3 likes this.

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