Loud Thunk and Drop on launch

***Chase*** · 03-10-2007, 03:10 PM

last night at the race track I launched it during a race with an eclipse. I heard a loud clunk and drop as if the motor had been lifted off the mounts and dropped again, I have lifted the car and inspected all the mounts and they appear to be fine... Does anyone else recall experiencing this? Because it sounded and felt like I ripped out a half shaft. This has happend a total of 3 times now and it only happens when I have the VSA off during drag races at the strip.

Im hoping this is normal because of the twisting nature of a motor torquing out.

I-NTEC · 03-10-2007, 08:30 PM

i just posted this on another thread we looked for this at our shop cause mine did it right after i put my header on and thought somthing wasnt tight, looked forever... finally figured out it was coming from the strut/spring, dont know if its bottoming out or the spring is just popping , but that was where it was coming from, basically the front end is lifting so much the strut is expanding as far as it can.

***Chase*** · 03-10-2007, 09:02 PM

whoa, thats crazy because My car is lowered on progress... I hope its not screwing up those ball bearings on the top of the strut...

I-NTEC · 03-10-2007, 09:12 PM

i think its the strut but it may be different on yours but from what people are saying it sounds the sam, we went as far as someone sitting under the hood when i droped the cluth lol

Mattzilla · 03-10-2007, 09:24 PM

Wheelhop?

xmx250 · 03-10-2007, 11:35 PM

i've heard it could be wheel hop/LSD working.............

raycl · 03-11-2007, 10:34 AM

Mine started after Comptech header install, dealer is going to replace the motor mount. I'll chime in if it helps.

Tastycakes · 03-11-2007, 05:22 PM

I dunno if its the same noise but i some times when i launch w/ VSA off (3-4 times so far) i get a loud POP, i mean a LOUD F**KING POP like i seriously thought i broke something.

***Chase*** · 03-11-2007, 05:24 PM

Quote:

Originally Posted by Tastycakes

I dunno if its the same noise but i some times when i launch w/ VSA off (3-4 times so far) i get a loud POP, i mean a LOUD F**KING POP like i seriously thought i broke something.

Yeah me too man, thats what im getting.. only with the VSA off tho..

suil · 03-11-2007, 07:22 PM

Quote:

Originally Posted by Chase

Yeah me too man, thats what im getting.. only with the VSA off tho..

Same s**T here!!!!! it's anoying!!

xmx250 · 03-11-2007, 08:32 PM

Shit! i got the loud pop today when i chirped 2nd......... WTF. I wonder if its is a bad motor mount?

How do i explain to the dealer that on hard launches my shit pops..........

raycl · 03-11-2007, 09:13 PM

Quote:

Originally Posted by xmx250

Shit! i got the loud pop today when i chirped 2nd......... WTF. I wonder if its is a bad motor mount?

How do i explain to the dealer that on hard launches my shit pops..........

I told them it happens when I accelerate over bumpy roads or railroad tracks.

I-NTEC · 03-11-2007, 09:26 PM

nothings gonna fix it until you get some kind of better mounts or a torque dampener, the motor just flexs to much which makes everthing else flex

bubbletop1961 · 03-12-2007, 12:27 AM

Quote:

Originally Posted by xmx250

Shit! i got the loud pop today when i chirped 2nd......... WTF. I wonder if its is a bad motor mount?

How do i explain to the dealer that on hard launches my shit pops..........

I agree. Mine will do it if you launch real hard or hit 2cd hard. Sounds like a bang and its coming from the passenger side floor. Right where you put your feet. There is a motor mount there, but I have inspected it and it looks good. I bet It has a tear in the rubber. Just trying to decide how to tell the dealer,.... When I drop the clutch at 3 to 5 it makes a bad sound

. There going to say... NO S@@T. Were not going to cover that.

Tastycakes · 03-12-2007, 01:18 AM

Yea i just remembered it did it on a pot hole once (front right tire hit it), and i launched it over a kinda bumpy road the first time it did it so i'm guessing suspension?

Also has it happened to anyone w/o wheel hop? Seems on smooth burnouts all is good.

Deff same problem, front right of the car. I mean i snapped my diff on my Trans Am on a hard launch once and i think this noise from the Si was louder lol.

***Chase*** · 03-12-2007, 01:24 AM

hmm if this continues some Hasport mounts may be in my future...

xmx250 · 03-12-2007, 02:44 AM

This is BS. Thank goodness i bought the 8 year warranty. So i'll let it pop all it wants, if it breaks, stealer is gonna have to replace it.

03-10-2007, 03:10 PM	#1 (permalink)
*Chase* watch for gestapo Join Date: Jul 2006 Location: El Paso Texas Age: 22 Posts: 3,308 Chase iTrader: 3 / 100%	Loud Thunk and Drop on launch last night at the race track I launched it during a race with an eclipse. I heard a loud clunk and drop as if the motor had been lifted off the mounts and dropped again, I have lifted the car and inspected all the mounts and they appear to be fine... Does anyone else recall experiencing this? Because it sounded and felt like I ripped out a half shaft. This has happend a total of 3 times now and it only happens when I have the VSA off during drag races at the strip. Im hoping this is normal because of the twisting nature of a motor torquing out. __________________

03-10-2007, 09:02 PM	#3 (permalink)
*Chase* watch for gestapo Join Date: Jul 2006 Location: El Paso Texas Age: 22 Posts: 3,308 Chase iTrader: 3 / 100%	whoa, thats crazy because My car is lowered on progress... I hope its not screwing up those ball bearings on the top of the strut... __________________

03-12-2007, 01:24 AM	#16 (permalink)
*Chase* watch for gestapo Join Date: Jul 2006 Location: El Paso Texas Age: 22 Posts: 3,308 Chase iTrader: 3 / 100%	hmm if this continues some Hasport mounts may be in my future... __________________

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03-10-2007, 08:30 PM	#2 (permalink)
I-NTEC Senior Member Join Date: Oct 2006 Posts: 307 iTrader: 4 / 100%	i just posted this on another thread we looked for this at our shop cause mine did it right after i put my header on and thought somthing wasnt tight, looked forever... finally figured out it was coming from the strut/spring, dont know if its bottoming out or the spring is just popping , but that was where it was coming from, basically the front end is lifting so much the strut is expanding as far as it can.

03-10-2007, 09:12 PM	#4 (permalink)
I-NTEC Senior Member Join Date: Oct 2006 Posts: 307 iTrader: 4 / 100%	i think its the strut but it may be different on yours but from what people are saying it sounds the sam, we went as far as someone sitting under the hood when i droped the cluth lol

03-10-2007, 09:24 PM	#5 (permalink)
Mattzilla Senior Member Join Date: Nov 2006 Location: South FL Posts: 547 Matt iTrader: 2 / 100%	Wheelhop?

03-10-2007, 11:35 PM	#6 (permalink)
xmx250 Senior Member Join Date: Oct 2006 Location: Westchester, N.Y. Age: 21 Posts: 6,100 iTrader: 1 / 100%	i've heard it could be wheel hop/LSD working.............

03-11-2007, 10:34 AM	#7 (permalink)
raycl Senior Member Join Date: Oct 2006 Location: West Des Moines Age: 40 Posts: 675 Ray iTrader: 0 / 0%	Mine started after Comptech header install, dealer is going to replace the motor mount. I'll chime in if it helps.

03-11-2007, 05:22 PM	#8 (permalink)
Tastycakes Senior Member Join Date: Feb 2007 Location: NW Suburbs of Chicago Age: 25 Posts: 2,644 Mike iTrader: 0 / 0%	I dunno if its the same noise but i some times when i launch w/ VSA off (3-4 times so far) i get a loud POP, i mean a LOUD F**KING POP like i seriously thought i broke something.

03-11-2007, 08:32 PM	#11 (permalink)
xmx250 Senior Member Join Date: Oct 2006 Location: Westchester, N.Y. Age: 21 Posts: 6,100 iTrader: 1 / 100%	Shit! i got the loud pop today when i chirped 2nd......... WTF. I wonder if its is a bad motor mount? How do i explain to the dealer that on hard launches my shit pops..........

03-11-2007, 09:26 PM	#13 (permalink)
I-NTEC Senior Member Join Date: Oct 2006 Posts: 307 iTrader: 4 / 100%	nothings gonna fix it until you get some kind of better mounts or a torque dampener, the motor just flexs to much which makes everthing else flex

03-12-2007, 01:18 AM	#15 (permalink)
Tastycakes Senior Member Join Date: Feb 2007 Location: NW Suburbs of Chicago Age: 25 Posts: 2,644 Mike iTrader: 0 / 0%	Yea i just remembered it did it on a pot hole once (front right tire hit it), and i launched it over a kinda bumpy road the first time it did it so i'm guessing suspension? Also has it happened to anyone w/o wheel hop? Seems on smooth burnouts all is good. Deff same problem, front right of the car. I mean i snapped my diff on my Trans Am on a hard launch once and i think this noise from the Si was louder lol.

03-12-2007, 02:44 AM	#17 (permalink)
xmx250 Senior Member Join Date: Oct 2006 Location: Westchester, N.Y. Age: 21 Posts: 6,100 iTrader: 1 / 100%	This is BS. Thank goodness i bought the 8 year warranty. So i'll let it pop all it wants, if it breaks, stealer is gonna have to replace it.