7mgte build opinions

supraflymkiii · 05-12-2010, 06:58 AM

Whoever you heard from that anything bigger than a 57 trim turbo shaft would snap is an idiot. Unless the turbo was built by him and he didn't have it balanced they are solid. Turbos a precisionally balanced so they can spin perfectly turbos see rpms around 100000 so no that is not true.

cre · 05-12-2010, 01:14 PM

Anybody who tells you it's balance which determines if a shaft will snap or not is an idiot... it's torsional stress which snaps 'em.. not poor balance.

I and most others are basing our opinion on the posts of those who've had this happen and the word of shops which don't offer larger upgrades anymore due to "reliability issues"... do more research, you've missed a lot. I'm not saying it happens to everyone, but a lot of shops (reputable shops, IMO) kept seeing these come back.

supraluver4life · 05-12-2010, 10:39 PM

Quote:

Originally Posted by supraflymkiii

Whoever you heard from that anything bigger than a 57 trim turbo shaft would snap is an idiot. Unless the turbo was built by him and he didn't have it balanced they are solid. Turbos a precisionally balanced so they can spin perfectly turbos see rpms around 100000 so no that is not true.

i understand that but think about if you spun in a circle at like 1000 rpms (assuming you were perfectly balanced) then say you put your arms out... they would come flying off because nof the centifugal forces

i dont mean to be a smart ass but it does make sense
i may be wrong though hahaha

supraluver4life · 05-12-2010, 10:42 PM

so the stock 7mgte internals can handle 400-450 horses reliably? just wanting to know cuz if im gonna rebuild the entire thing might as well do what needs to be done to start with.

cre · 05-13-2010, 02:39 AM

The problem isn't with the wheel coming apart, the problem lies in the exponential increase in torsional stress on the spindle. All of the failures I've seen pictures of started with the shaft snapping.

Yes, a HEALTHY 7M-GTE long block can withstand 400-450 (other things will need to be beefed up, of course). But, if you're going to go to all the trouble build for more... it'll last a lot longer.

supraflymkiii · 05-13-2010, 03:04 PM

Sorry man^, I'm pretty sure balance has a little to do with it to though, because if its off balance like a wheel its going to be a little wobbly and will end up doing all sorts of crazy shit. Not saying that your wrong I'm just adding balance to the equation.

cre · 05-13-2010, 04:54 PM

sure balance counts, but a freshly rebuilt and upgraded turbo had damned well better have been balanced... if not that's the shops fault, not an inherent weakness.

supraluver4life · 05-13-2010, 08:46 PM

thats what i meant but you phrased it in such a great way cre

05-12-2010, 01:14 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Anybody who tells you it's balance which determines if a shaft will snap or not is an idiot... it's torsional stress which snaps 'em.. not poor balance. I and most others are basing our opinion on the posts of those who've had this happen and the word of shops which don't offer larger upgrades anymore due to "reliability issues"... do more research, you've missed a lot. I'm not saying it happens to everyone, but a lot of shops (reputable shops, IMO) kept seeing these come back. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

05-12-2010, 10:42 PM	#4
supraluver4life 3" Exhaust Join Date: Nov 2009 Location: Santa Fe, NM Posts: 135	so the stock 7mgte internals can handle 400-450 horses reliably? just wanting to know cuz if im gonna rebuild the entire thing might as well do what needs to be done to start with. __________________ Cusco front, Tein Rear coilovers Massive DDP, 3'' custom catless exhaust, Tsudo muffler 4.5'' outlet, Apexi cold air intake, Act stage 3 clutch, ct26 turbo (stock)- 10psi +300rwhp "Not driving a car because its too nice, is like not fucking your gf so shes still tight for the next guy"

05-13-2010, 02:39 AM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The problem isn't with the wheel coming apart, the problem lies in the exponential increase in torsional stress on the spindle. All of the failures I've seen pictures of started with the shaft snapping. Yes, a HEALTHY 7M-GTE long block can withstand 400-450 (other things will need to be beefed up, of course). But, if you're going to go to all the trouble build for more... it'll last a lot longer. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

05-13-2010, 04:54 PM	#7
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	sure balance counts, but a freshly rebuilt and upgraded turbo had damned well better have been balanced... if not that's the shops fault, not an inherent weakness. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

05-13-2010, 08:46 PM	#8
supraluver4life 3" Exhaust Join Date: Nov 2009 Location: Santa Fe, NM Posts: 135	thats what i meant but you phrased it in such a great way cre __________________ Cusco front, Tein Rear coilovers Massive DDP, 3'' custom catless exhaust, Tsudo muffler 4.5'' outlet, Apexi cold air intake, Act stage 3 clutch, ct26 turbo (stock)- 10psi +300rwhp "Not driving a car because its too nice, is like not fucking your gf so shes still tight for the next guy"

05-12-2010, 06:58 AM	#1
supraflymkiii 3" Exhaust Join Date: Sep 2005 Location: Menasha, WI Posts: 63	Whoever you heard from that anything bigger than a 57 trim turbo shaft would snap is an idiot. Unless the turbo was built by him and he didn't have it balanced they are solid. Turbos a precisionally balanced so they can spin perfectly turbos see rpms around 100000 so no that is not true.

05-13-2010, 03:04 PM	#6
supraflymkiii 3" Exhaust Join Date: Sep 2005 Location: Menasha, WI Posts: 63	Sorry man^, I'm pretty sure balance has a little to do with it to though, because if its off balance like a wheel its going to be a little wobbly and will end up doing all sorts of crazy shit. Not saying that your wrong I'm just adding balance to the equation.

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