i just got my car tuned again for more hp and my exhaust manifold bolts are getting loose. happened once when it was on the dyno then again after my drive home (3 hour drive) later on that day.

does this happen much with cars with FI?

i never had a problem with the bolts getting loose when i was 100hp less (my old tune). i ran it that way for about 3 months with no bolts becoming loose.

can anyone recommend any other bolts to replace them with or will the bolts not loosen after i drive the car for awhile on the new increased power?

thanks

 

Lock Tight? Are they botls or studs and nuts?

 

try lock washers that u can get a lowes. or jsu put sometread lock on the bolts and then out them on.. its jus excessive vibration making them come loose

 

an old trick is to use teflon tape on the bolts. im not a fan of lock tight on manifold/header bolts.

 

the ones that are coming loose are bolts.

i can take a pic when i get a chance to this weekend to reference

 

Are you still using your crappy factory mounts? The motor torquing that hard can cause the bolts to back out. If so get some urethane mounts.

 

are we talking about manifold -> head or manifold -> turbo? either way i suggest switching to studs w/ lock washers and nuts

 

If you mean the manifold to head bolts, ARP sells a set. Althought its not cheap. If lock washers don't work you might want to buy the oem studs with lock nuts.

If you mean the turbo to manifold bolts, only thing that works is either stage8 bolts or ARP drilled bolts (run safety wire). locktite, lock washers, high temp RTV, and teflon tape wont work...tried all of em myself.

 

this is what you need mine would back out every other day i bought the arp and never looked back they did run me $100 tho but thats cheap compared to wasting time at the dyno.

http://www.speedsouth.com/arp_automo...s/g-59645.aspx

 

same as what i run and since ive done these i never had a single problem with them coming loose, arp for the win

you can also run some lockign bolts form STAGE 8

 

Where is a good place to get those from?? whats the common length everyone runs?

 

www.summitracing.com is best price i found when looking last time. Um here is the deal with these things when it tells you length its overall length including the tip of the stud that isnt threded. so measure yours stock studs and add like 1/4inch at least. I forget what size im running, ive had them for 4 years. I think i have the2" ones but possibly the 2.25" ones. i wanna say stock is 1.75" and they come up pretty short that way cant really get a bit on the threds to good form personal experience anyhow, some others had luck with shorter ones but if you have room then get longer

 

^^ thanks i think ill just go with the 2.25". Thanks a lot