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I want to know how far people have pushed stock TTY bolts I'm currently on 14 psi and haven't had a issue and thinking of doing a pulley swap should net around 16 psi. I know people are gonna say I'm on the limit but I wanna know what people have pushed there stock bolts. The heads are new and bolts only have a year since the cam swap I would have done ARP but I had no intention of boosting my truck but now I'm 8 months with 14 psi. Next question is how successful have people been on swapping stock bolts to ARP one at a time I know alot of people have had luck doing it and lots of diesel preformance shops do it on there builds.
Good timing on this , I was about to post the same question. Mine are original 04 lq4 , have pushed 15.5 lbs for the last 4 months or so and boosted now for nearly 5 yrs / 30k miles on a 180k mile engine . Only now after adding a pre turbo W/M nozzle do I have the ability to go higher , hit the first warning on the AEM tru boost which I think was about 18 lbs but wasn't logging and was on street tires so just a rolling burnout really so nothing got hurt . Also wondering if I could push it further with any bit of safety. Don't want to hijack but am in for the discussion, will start a thread with all my recent changes and results soon
Good timing on this , I was about to post the same question. Mine are original 04 lq4 , have pushed 15.5 lbs for the last 4 months or so and boosted now for nearly 5 yrs / 30k miles on a 180k mile engine . Only now after adding a pre turbo W/M nozzle do I have the ability to go higher , hit the first warning on the AEM tru boost which I think was about 18 lbs but wasn't logging and was on street tires so just a rolling burnout really so nothing got hurt . Also wondering if I could push it further with any bit of safety. Don't want to hijack but am in for the discussion, will start a thread with all my recent changes and results soon
No man your all good we are all here for info. I'm thinking about just sending it and if it lifts a head then I'll put a set of bolts. I just haven't seen many people discussing the ARP bolts or studs change one at a time. I've seen people that have had success. And I don't see much on people that have posted on when there stock bolts let go.
I built a turbo lq4. Back in 2012 and you could get arp for $400 or gm ls9 tty bolts I used the gm bolts and ls9 gaskets. Never had an issue up over 20 psi. Ran it for 5 years and never had an issue. Car ran 9.01 at 150 mph at 3400 lbs. I have no issue running them on any turbo build with the ls9 gaskets
Ran it on gas for a year or so at like 12 psi boost . After that it was e85 only . It doesn’t matter what parts you use if it detonates it will break .
I have built 4 or 5 turbo engines with the gm bolts and ls9 gaskets. They do as well as anything I have seen
I really think good surface finish and gaskets go a long way. I don't really like using bolts multiple times in aluminum blocks and studs do torque up a lot nicer on the fine thread ends.
There is no “safe boost level” for a TTY bolt. The bolts don’t care how much boost you run. Its all about cylinder pressure and spikes. You can spike the cyl pressure on 8lbs or 30lbs. Either will cause the head to lift and stretch the bolts. You should have no worries wanting to add boost to the setup *if* your fuel can handle it and *if* the car is tuned correctly to stay away from peaky cyl pressures. Just stay away from peak TQ timing levels at low/mid level rpm for what ever fuel you run. If you add too much IGN lead at too low of an RPM (even without detonation) the cyl pressure will be MUCH higher and can cause sealing issues.
IMO the bolts are a better option for most beginners as they act almost like a fuse for a poor tune. If you push water at 15-16lbs or blow the gasket completely… your tune up is off. Better to push some water and lift a head than to bend the rod all to hell or blow ringlands off the pistons.
Exactly I do all my own tuning and I set my timing low get my fueling perfect and add a new set of plugs and read my marks as I add timing. I don't think I'll have a issue.
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