lowered my nismo now there is a thumping at 70 mph

HOTRODPRO · 02-25-2014, 04:16 PM

i'm hoping ya'll can help answer a question. i dropped my car 1' front and .5' in the rear with springs, and now i hear a thumping sound at 70 mph like something is flapping under the car. has anyone ran into this? i have looked under it and see nothing loose. could it be the front spoiler vibrating now that it is closer to the ground. if you drive below 70 it goes away. i have not tried it above 70.

thanks for your help.

-danny

Grindkiezer · 02-25-2014, 04:47 PM

Thumping or rattling? I can't imagine how a drop that small would create any major problems

Hotrodz · 02-25-2014, 07:54 PM

It maybe the undertray...check and see if all the clips are still buttoned up. They will pop loose at high speeds and the undertray will flap when there is enough turbulence.

H2O_Doc · 02-25-2014, 09:22 PM

Slow squirrels?

Z-Girl 12 · 02-25-2014, 10:15 PM

Quote:

Originally Posted by H2O_Doc

Slow squirrels?

HOTRODPRO · 02-26-2014, 12:48 PM

Quote:

Originally Posted by Grindkiezer

Thumping or rattling? I can't imagine how a drop that small would create any major problems

thumping. like you ran over something and it's flopping around under the car. i guess i'll put it back on the lift and bang around and see if something is loose.

thanks guys for your help.

nope. no dead animals under the car.

-danny

fuct · 02-27-2014, 11:20 AM

Quote:

Originally Posted by Hotrodz

It maybe the undertray...check and see if all the clips are still buttoned up. They will pop loose at high speeds and the undertray will flap when there is enough turbulence.

this!!!!

when mine came loose at 80mph it would sound like a horrible thumping. but it only got worse the faster i went.

HOTRODPRO · 03-16-2014, 04:38 PM

Well I fixed the problem. Yesterday I put the z on the lift and took a peak under the front. What I found was some missing plastic barrel clips missing under the radiator support. So I installed some threaded inserts into the aluminum under the radiator. Three bolts and three fender washers solved the plastic under belly from flapping above 70.

God-Speed · 03-16-2014, 05:38 PM

Quote:

Originally Posted by HOTRODPRO

Well I fixed the problem. Yesterday I put the z on the lift and took a peak under the front. What I found was some missing plastic barrel clips missing under the radiator support. So I installed some threaded inserts into the aluminum under the radiator. Three bolts and three fender washers solved the plastic under belly from flapping above 70.

Good deal!!

Hotrodz · 03-16-2014, 08:37 PM

Fixed for now, but I still see a ZSpeed udertray in your future!

02-25-2014, 04:16 PM	#1 (permalink)
HOTRODPRO Base Member Join Date: Dec 2013 Location: Spring, TX. Posts: 12 Drives: 2010 red Nismo #0203 Rep Power: 11	lowered my nismo now there is a thumping at 70 mph i'm hoping ya'll can help answer a question. i dropped my car 1' front and .5' in the rear with springs, and now i hear a thumping sound at 70 mph like something is flapping under the car. has anyone ran into this? i have looked under it and see nothing loose. could it be the front spoiler vibrating now that it is closer to the ground. if you drive below 70 it goes away. i have not tried it above 70. thanks for your help. -danny

02-25-2014, 04:47 PM	#2 (permalink)
Grindkiezer Track Member Join Date: Sep 2012 Location: San Diego Posts: 824 Drives: A Car Rep Power: 13	Thumping or rattling? I can't imagine how a drop that small would create any major problems __________________ Z

02-25-2014, 07:54 PM	#3 (permalink)
Hotrodz Premium Member Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684384	It maybe the undertray...check and see if all the clips are still buttoned up. They will pop loose at high speeds and the undertray will flap when there is enough turbulence. fuct and Whtfairladyz like this. __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

02-25-2014, 09:22 PM	#4 (permalink)
H2O_Doc A True Z Fanatic Join Date: Apr 2013 Location: Northern VA Posts: 1,083 Drives: '14 370Z, '12 4Runr Rep Power: 14	Slow squirrels? Whtfairladyz likes this.

03-16-2014, 04:38 PM	#8 (permalink)
HOTRODPRO Base Member Join Date: Dec 2013 Location: Spring, TX. Posts: 12 Drives: 2010 red Nismo #0203 Rep Power: 11	Fixed it Well I fixed the problem. Yesterday I put the z on the lift and took a peak under the front. What I found was some missing plastic barrel clips missing under the radiator support. So I installed some threaded inserts into the aluminum under the radiator. Three bolts and three fender washers solved the plastic under belly from flapping above 70.

03-16-2014, 08:37 PM	#10 (permalink)
Hotrodz Premium Member Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684384	Fixed for now, but I still see a ZSpeed udertray in your future! __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

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