a strange noise in the high RPM's

Kaiser370z · 10-09-2012, 04:20 AM

Hi guys
Yesterday while I was testing my acceleration, I reached the 125 miles per hours
After I released the accelerator, I heard a sound like the differential sound and it is fading gradually while the RPM goes down

Note : this is the only condition I can hear that sound with

I asked a mechanic friend of mine About it and he told me it is the differential but I am not sure

Any tips guys??

cheshirecat · 10-09-2012, 07:04 AM

strange sounds are common at the 125 miles per hours

I would trust your mechanic.

Kaiser370z · 10-09-2012, 07:47 AM

Yeah but I didn't hear this Sound before

cheshirecat · 10-09-2012, 09:33 AM

Have you been keeping up with maintenance? Differential fluid change, tranny fluid change (if manual tranmission)

Any changes to the car- modifications, etc, between when you did hear it and didn't hear it?

Mitco39 · 10-09-2012, 09:44 AM

Did you put a tank of regular in it by chance?

jcosta79 · 10-09-2012, 11:37 AM

Does it decrease as the RPM's drop or as the SPEED decreases? You mentioned RPM, and if it is caused by high RPM's then it should happen at any speed. Differential noise would be speed related, not RPM related.

If it is RPM related, I doubt it's the diff.

10-09-2012, 04:20 AM	#1 (permalink)
Kaiser370z Base Member Join Date: Oct 2011 Location: Saudi Arabia Posts: 49 Drives: Varis 370z 7AT Rep Power: 14	a strange noise in the high RPM's Hi guys Yesterday while I was testing my acceleration, I reached the 125 miles per hours After I released the accelerator, I heard a sound like the differential sound and it is fading gradually while the RPM goes down Note : this is the only condition I can hear that sound with I asked a mechanic friend of mine About it and he told me it is the differential but I am not sure Any tips guys??

10-09-2012, 09:44 AM	#5 (permalink)
Mitco39 A True Z Fanatic Join Date: Aug 2012 Location: Edmonton Alberta Canada Posts: 2,089 Drives: 40th 370z Rep Power: 132	Did you put a tank of regular in it by chance? __________________ 2007 Chevy Duramax - EFILive Tuned By Me 2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her My Build --> http://www.the370z.com/members-370z-...39s-build.html

10-09-2012, 11:37 AM	#6 (permalink)
jcosta79 A True Z Fanatic Join Date: Jul 2012 Location: N/A Posts: 1,430 Drives: N/A Rep Power: 15	Does it decrease as the RPM's drop or as the SPEED decreases? You mentioned RPM, and if it is caused by high RPM's then it should happen at any speed. Differential noise would be speed related, not RPM related. If it is RPM related, I doubt it's the diff. __________________ 2012 PW NISMO #0559 - GT Spec Brace Kit - Swift Springs - ARK TP & Invidia CBE K&N Intake - UpRev Tune - 15mm Z1 Spacers & Studs - StopTech Slotted Rotors & SS Lines - ZSpeed CMAK with Stage 2 Clutch and Lightweight Flywheel

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10-09-2012, 07:04 AM	#2 (permalink)
cheshirecat A True Z Fanatic Join Date: Jan 2009 Location: Florida Posts: 1,428 Drives: N54 135i Rep Power: 292	strange sounds are common at the 125 miles per hours I would trust your mechanic.

10-09-2012, 07:47 AM	#3 (permalink)
Kaiser370z Base Member Join Date: Oct 2011 Location: Saudi Arabia Posts: 49 Drives: Varis 370z 7AT Rep Power: 14	Yeah but I didn't hear this Sound before

10-09-2012, 09:33 AM	#4 (permalink)
cheshirecat A True Z Fanatic Join Date: Jan 2009 Location: Florida Posts: 1,428 Drives: N54 135i Rep Power: 292	Have you been keeping up with maintenance? Differential fluid change, tranny fluid change (if manual tranmission) Any changes to the car- modifications, etc, between when you did hear it and didn't hear it?