Forgstar F14 Wheel Failure

critical · 08-09-2015, 03:46 PM

I know this is a popular wheel for 370z owners so thought I'd share this.

Apparently failure wasn't due to a crash. Just normal driving. Car was a BMW. My friend who's a nano engineer speculated, "The wheel could have had a some congregated defects in the lattice structure of the alloy that caused an amplified stress crack that propagated over time. Then if introduced to a large stress, the material defects agglomerate even more leading to crack propagation and subsequent plastic deformation. Very interesting to know the result of forgestar's failure analysis."

imo be careful with your wheel selection. remember the oem 19" ray's are light forged, and safe.

madwi · 08-09-2015, 04:07 PM

Was not expecting to see 1/4 of the wheel ******.

lovemyvq · 08-09-2015, 04:11 PM

The crack is a systemic anomaly inherent to the programming of the Forgestar. Although the transport process has altered it's consciousness, it irrevocably remains cast not forged. Ergo, concordantly, vis-a-vis...I have no idea what I'm saying.

Trips · 08-09-2015, 04:24 PM

This issue has plagued Forgstars for years.

Doesn't happen often, But it does happen.

You get what you pay for I guess.

Thanks for the heads up post.

AdamRacer · 08-09-2015, 04:26 PM

Quote:

Originally Posted by lovemyvq

Ergo, concordantly, vis-a-vis...I have no idea what I'm saying.

Lol..

I would think if this was a major problem we would see a lot more posts about forgestar failures.

AntiVenom · 08-09-2015, 04:54 PM

Like Trips said, they are cast wheels, it can happen. I certainly wouldn´t be swayed away from purchasing Forgestars by this. I´d say their failure rate must be pretty low actually given the popularity of the wheel and the fact that I´ve only seen a few of these types of failure (this one being the worst). However, I wouldn´t put them on a track.

Thanks for posting, though. No matter what I like being informed.

JARblue · 08-09-2015, 05:04 PM

Yikes...

The OEM Rays Sport/Nismo wheels are the best wheels available considering they are super light and consistently available for cheap on the forum. Almost all aftermarket options are a downgrade in performance anyway. And that is especially true if you're not spending at least $3-6K.

NORAIN · 08-10-2015, 05:08 PM

Quote:

Originally Posted by AdamRacer

Lol..

I would think if this was a major problem we would see a lot more posts about forgestar failures.

This only the 2nd one I've seen, ironically the other was a BMW too. Looks like a big pot hole hit. Is he saying he hit nothing?
OEM Rays are great quality wheels... not very pretty and the offset sucks IMO.

jshare1 · 08-10-2015, 06:32 PM

Quote:

Originally Posted by NORAIN

This only the 2nd one I've seen, ironically the other was a BMW too. Looks like a big pot hole hit. Is he saying he hit nothing?
OEM Rays are great quality wheels... not very pretty and the offset sucks IMO.

Thats what Im saying, I have a hard time believing just rolling a rim would sustain that damage, hitting a pot hole and having a sudden spike in pressure to a specific area, yes

JARblue · 08-10-2015, 07:13 PM

I'd be interested to see the front of the rim - it looks like there wasn't much, if any, damage there. Hard to imagine an impact causing that kind of damage to the inside of the wheel and the barrel without also significantly damaging the face of the wheel. I guess they could have clipped the edge of a pothole or something.

Aesthetics are subjective. And very rarely do parts work for both aesthetics and performance - they are often contradicting unless you are spending money for high dollar parts (e.g. CF hood is going to weigh more than stock hood unless you pay the premium for dry carbon). So if you're changing the wheels for the looks, then performance shouldn't really come into play. Not much racing is done on showroom floors.

And the offsets are not ideal, I agree. But it's hard to justify spending the thousands of dollars for wheels equal in quality in terms of performance just to correct the offset. Once again, performance shouldn't really come into consideration because parts made for aesthetic reasons will often have zero or even a negative impact on performance.

Aviator44 · 08-10-2015, 09:40 PM

Quote:

Originally Posted by critical

"The wheel could have had a some congregated defects in the lattice structure of the alloy that caused an amplified stress crack that propagated over time. Then if introduced to a large stress, the material defects agglomerate even more leading to crack propagation and subsequent plastic deformation. Very interesting to know the result of forgestar's failure analysis."

That is completely and technically correct. Plastic deformation due to fatigue would also be possible explanation. Without a sudden, increased, point stress the crack may have reached a point unable to withstand even normal rotational and road impact stresses thus leading to structural failure. If in fact the wheel failed under normal driving conditions this would be plausible.

Mike · 08-10-2015, 10:53 PM

looks like he hit something. my OEM BMW wheels looked like that when I hit a piece of granite in the road in the dark.

I have been tracking on my forgestars and will continue to do so.

EVOHUNTER · 08-11-2015, 10:12 AM

honestly, I see like 3 bmws a week with cracked wheels. (our roads are the *****)

Those 335is with the 19" m wheels and a 255/30R19 runflats.

Ive had one customer replace 3 of them at 1190$ a wheel.

He was fed up with it so We put him into a replica BMW wheel and he hasn't had a issue since. lol

Also, I highly doubt that wheel just let go under normal driving conditions.

Something was hit etc pothole.. to cause a few cracks and take away from the structure. I don't care how crappy the wheel is, it wont just taco under normal driving conditions lol.

TerribleONE · 08-11-2015, 10:14 AM

Yikes

Mike · 08-12-2015, 05:50 PM

Quote:

Originally Posted by EVOHUNTER

honestly, I see like 3 bmws a week with cracked wheels. (our roads are the *****)

Those 335is with the 19" m wheels and a 255/30R19 runflats.

Ive had one customer replace 3 of them at 1190$ a wheel.

yeah, I had to make an insurance claim with that one!

08-09-2015, 04:11 PM	#3 (permalink)
lovemyvq Base Member Join Date: Apr 2012 Location: London, Ontario Age: 41 Posts: 83 Drives: 05 350Z, 11 370Z Rep Power: 29	The crack is a systemic anomaly inherent to the programming of the Forgestar. Although the transport process has altered it's consciousness, it irrevocably remains cast not forged. Ergo, concordantly, vis-a-vis...I have no idea what I'm saying. EZT, dvo, ufoz8mycow and 6 others like this.

08-09-2015, 04:24 PM	#4 (permalink)
Trips Administrator Join Date: May 2009 Location: Disneyland, Ca Posts: 8,732 Drives: 🔰 Rep Power: 10	This issue has plagued Forgstars for years. Doesn't happen often, But it does happen. You get what you pay for I guess. Thanks for the heads up post. axmea? and Zbrah like this. __________________

08-09-2015, 04:54 PM	#6 (permalink)
AntiVenom Track Member Join Date: Nov 2014 Location: North Carolina Posts: 695 Drives: 2011 KAD 6MT Rep Power: 12	Like Trips said, they are cast wheels, it can happen. I certainly wouldn´t be swayed away from purchasing Forgestars by this. I´d say their failure rate must be pretty low actually given the popularity of the wheel and the fact that I´ve only seen a few of these types of failure (this one being the worst). However, I wouldn´t put them on a track. Thanks for posting, though. No matter what I like being informed. __________________ The GREY GHOST Chronicle instagram: jdmunilla Last edited by AntiVenom; 08-09-2015 at 09:18 PM.

08-09-2015, 05:04 PM	#7 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	Yikes... The OEM Rays Sport/Nismo wheels are the best wheels available considering they are super light and consistently available for cheap on the forum. Almost all aftermarket options are a downgrade in performance anyway. And that is especially true if you're not spending at least $3-6K. 2011 Nismo#91, Hotrodz, Brendan and 1 others like this. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

08-10-2015, 07:13 PM	#10 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	I'd be interested to see the front of the rim - it looks like there wasn't much, if any, damage there. Hard to imagine an impact causing that kind of damage to the inside of the wheel and the barrel without also significantly damaging the face of the wheel. I guess they could have clipped the edge of a pothole or something. Aesthetics are subjective. And very rarely do parts work for both aesthetics and performance - they are often contradicting unless you are spending money for high dollar parts (e.g. CF hood is going to weigh more than stock hood unless you pay the premium for dry carbon). So if you're changing the wheels for the looks, then performance shouldn't really come into play. Not much racing is done on showroom floors. And the offsets are not ideal, I agree. But it's hard to justify spending the thousands of dollars for wheels equal in quality in terms of performance just to correct the offset. Once again, performance shouldn't really come into consideration because parts made for aesthetic reasons will often have zero or even a negative impact on performance. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

08-09-2015, 04:07 PM	#2 (permalink)
madwi A True Z Fanatic Join Date: Sep 2012 Location: West Michigan Posts: 31,410 Drives: Granma red Z Rep Power: 2684429	Was not expecting to see 1/4 of the wheel ******.

08-10-2015, 10:53 PM	#12 (permalink)
Mike The370Z.com Sponsor Join Date: Jun 2009 Location: Loganville, GA Posts: 5,944 Drives: 370z Rep Power: 2186	looks like he hit something. my OEM BMW wheels looked like that when I hit a piece of granite in the road in the dark. I have been tracking on my forgestars and will continue to do so. speedfreek, Hotrodz and AntiVenom like this. __________________ NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z Porsche: 93 968 / 23 Macan GTS / 93 968

08-11-2015, 10:12 AM	#13 (permalink)
EVOHUNTER Track Member Join Date: Jul 2011 Location: Edmonton, Canada Posts: 681 Drives: BOOSTED3-7-0 Rep Power: 15	honestly, I see like 3 bmws a week with cracked wheels. (our roads are the ****) Those 335is with the 19" m wheels and a 255/30R19 runflats. Ive had one customer replace 3 of them at 1190$ a wheel. He was fed up with it so We put him into a replica BMW wheel and he hasn't had a issue since. lol Also, I highly doubt that wheel just let go under normal driving conditions. Something was hit etc pothole.. to cause a few cracks and take away from the structure. I don't care how crappy the wheel is, it wont just taco under normal driving conditions lol. __________________ Last edited by EVOHUNTER; 08-11-2015 at 10:17 AM.*

08-11-2015, 10:14 AM	#14 (permalink)
TerribleONE A True Z Fanatic Join Date: Jan 2009 Location: Socal Posts: 10,203 Drives: WOT Rep Power: 5850	Yikes __________________ 638WHP 541WTQ @ 13.5PSI Build thread

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