 Turbo Manifold Stud Issues On Track Days Help! |
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 4 Jun 2008, 08:01 PM
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#1
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 Rank: RB20DET  Posts: 49 Joined: 26th July, 2005 Trader Rating : 0  |
Hey all,
I have had a constant issue that i am sick to death of with the nuts that hold the turbo to the manifold rattling loose on track days. I have an SR20det in my datsun 1600 and initially thought the problem was due to the low mount manifold. I painstakingly made a new topmount manifold thinking that gravity would fix the problem but alas it hasn't. the nuts wind their way up the studs resulting in the car sounding like a truck due to the exhaust leak. i've pulled the turbo off and pulled the studs out. has anyone else experienced this? i also noticed that the merge collector area of the manifold has been very hot and had some flaking on the outside. not sure of this is common either. any help would be appreciated |
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4 Jun 2008, 08:01 PM
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4 Jun 2008, 08:16 PM
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#2
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 GTR R32  Posts: 1,038 Joined: 18th February, 2005 From: Brisbane Car(s): R32(X2) R33 R34 R35 GTR Trader Rating : 0 |
hi mate
it is probably the studs stretching we had the same thing happening once. you need to by inconel studs or good oem ones, then use locks tabs too , no more problem! hope this helps -------------------- |
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4 Jun 2008, 09:08 PM
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#3
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 Victory   Posts: 198 Joined: 21st October, 2005 From: Wollongong Car(s): R33 GTR & GTST Real Name: Charles Trader Rating : 6 |
I had to replace my exhaust manifold studs at only 100k because two of the had simply broken off and I do not even drive that hard.
A track day would create enough heat to expand the studs to the point where the nuts could come loose. OEM exhaust studs are known for their inability to cope with the heat and it is common to have to replace them. As "giant" has suggested the use of lock tabs would also help and provide that extra level of security. -------------------- Serviced by:
 (OO\SKYLINE/OO)Successful Trades: Performance Wise, Kyle785, livicuru, AMEC, Braadz, Ninobrown, Blitz, DaGr81, lukits01, teazn_r33, siddr20, markimak, markk, phatlavish, FATAZZ, bakker, SRB empire, dori32, SoFly, tufrx3, gts25, drift_34, clippy213, CRMIN-4, BHDave, Crimsonknight, toyos, r32woohoo, Risking |
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6 Jun 2008, 12:05 PM
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#4
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Rank: RB20DET Posts: 49 Joined: 26th July, 2005 Trader Rating : 0 |
Ok, well i've ordered some oem studs and locking tabs from nissan, and have bought some nifty little locking nuts that are slightly crimped at one end.
I was going to buy stainless studs, are the oem ones better? Are the oem studs inconel? also would this recurring problem have anything to do with how the exhaust is hung? it has a hanger in the middle and at the end of the system. i just want to totally eliminate this happening again! |
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6 Jun 2008, 12:12 PM
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#5
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 The SAU state whore......... Ex SAUWA Member Posts: 4,635 Joined: 28th August, 2003 From: Melb Car(s): '97 S3 GTR Real Name: Ant Trader Rating : 18 |
+1 for inconel studs....not sure if the OEM ones are (I'd suggest not).
I had the same problem with my GTR...did a few track days and the exhaust studs stretched due to heat. Replaced them with inconel ones and not a problem since....cost a few $$ though. -------------------- 0-60 5.2 sec 1/4 13.7 @ 103.5mph 60-0 120 ft - GTR = Absolute Power Corrupts!
 EVO on the new 35GTR "so I simply pin the throttle wide open in second gear. At which point I am in no doubt that the GT-R has supercar pace. The last time I was this wide-eyed with shock was two days earlier when I sat on a Japanese lavatory for the first time and it squirted a startlingly high-pressure jet of water at me." “You can’t be a real country unless you have beer and an airline – it helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer.” - Frank Zappa |
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6 Jun 2008, 12:53 PM
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#6
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Rank: RB20DET Posts: 49 Joined: 26th July, 2005 Trader Rating : 0 |
QUOTE(Ant97GTR @ 6 Jun 2008, 12:12 PM)  +1 for inconel studs....not sure if the OEM ones are (I'd suggest not). I had the same problem with my GTR...did a few track days and the exhaust studs stretched due to heat. Replaced them with inconel ones and not a problem since....cost a few $$ though. oh ok, where can i get the inconel studs from? any engineering type shops? how much is a few $... |
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6 Jun 2008, 08:49 PM
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#7
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 that's racing!   Posts: 18,960 Joined: 10th May, 2002 From: Sydney Car(s): bnr32,z33,wgnc34,ungd21 Trader Rating : 19 |
nissan had the same problem too. thats why they put the locking plates on.
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6 Jun 2008, 09:28 PM
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#8
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 Rank: RB26DE Posts: 14,128 Joined: 27th June, 2002 Trader Rating : 6 |
Stainless bolts and nuts are nto that great. Really stainless isnt that great a material, especially since they grow a lot with heat and they are nto all that strong in tensile strength.
Yeh, OEM or inconel -------------------- Minister of RB20 propaganda RB30s are for folk who prefer roofies to romance FOR SALE : RB20 HKS CAMS, Complete R32 RB25DE, Cast Low Mount HKS Manifold and Gate + more Growing old is mandatory; growing up is optional. |
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9 Jun 2008, 02:10 PM
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#9
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Rank: RB20DET Posts: 49 Joined: 26th July, 2005 Trader Rating : 0 |
cool, well got the oem studs and locking plates plus the locking nuts. I'm just going to have to see how it goes at calder, fingers crossed!
thanks everyone for their help! |
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