Might as well get the ARP studs and not worry about it man. Im pretty sure you ll want more boost and more power in the future lol Dont we all?

 

I blended some 100 octane from the track from my regular 91 I use. I kept topping off after every session so Im pretty sure the mix in my tank was at least a 97 octane by the time it happened.

 

ya my wallet has been pretty sorry lately too.
I got most of it put back together with some minor upgrades. Now Im just waiting to get my head back from MAP, throw that on with some ARP studs because Im not taking a chance this time.

Funny thing is a wideband gauge and arp headstuds were on my to do list after that track day.

 

I asked the same question a few months back except that I was boosting 25psi on a 20g sized Tomei turbo. I decided to instal the ARP studs for the peace of mind, plus they are inexpensive.

 

If you left the timing alone from your pump gas tune and ran higher octane that may have resulted in higher EGT's . There is a balance between octane and timing IMO.

I'm not sure if I would do headstuds with the head on the car. There is something about a machine screwing all of them down at the factory at once that seems appealing. Now, if I was building an engine I wouldn't hesitate to install them.

A buddy of mine ran a 3 mile roadcourse on 100oct with the stock turbo at 25-26lbs all day and was fine. I would be more worried about oil temps then anything.

 

I'd only replace the head studs, if I was already taking the head off. Please safe yourself the headache, and refrain from doing the "1x1" head stud replacement method. You'll more than likely end up with a leaking head gasket. You can see from others experience, with a safe tune, you can get away with some pretty high boost/ PSI. If you're on the stock turbo, don't even worry about it.

Edit : ^ you beat me to it! I practically echoed what you said.. I agree completely though.

 

hmm, ya I guess I never thought about that being a possibility. It was starting to get a little warm that day and so I figured Id put in a little higher octane fuel for safety measures. That does answer some questions on things I found during the teardown though.

 

It could've been other something else as well. Things break under power.

Now if any of the exh valves were bent I would definitely say it was timing/egt/backpressure related.

 

Power output started to get progressively lower, to the point I had to point by a stock focus that day,haha. That's when I saw my oem coolant gauge start to peg at the hot mark. I pulled off the line to a safe spot, shut it off then it wouldn't start. It just cranked like it had 0 compression. I couldn't really hear the pump but I had my helmet on though. I had it towed back to the pits and found some oil and coolant leakage around the engine bay, keep in mind I had no leaks whatsoever before.

I posted a thread on here, Ill see if I can dig it up. But yes, It did look like I bent a few valves on one cylinder mostly. Tney ended up kissing the piston tops. But bending valves wouldn't make your coolant gauge spike up like that. Looking at the HG it had marks where you could tell it was leaking through and the way the combustion chambers were eaten up looks like coolant was introduced there and flashed cooled the cylinders and just ate chunks away the combustion chamber.

A couple turns ahead of me a Lotus crashed into the wall and totaled his car same time I had my issues. Another Evo blew his heater hose line. It was just not a good day,haha.

Sorry to thread jack.

 

^ sounds like everyone had a bad day that day... The lotus definitely "one up'd" you lol I wouldn't of felt so bad after that

 

exactly what I was thinking. It made me realize it could have been worse. Honestly if it was going to give Im glad it was on the track and not on the 2 hr drive back home. Surprisingly when I called AAA to get towed back home they did not ask questions and had no problems sending a flatbed when I told them it is broken down at a racetrack, ahh the benefits of being an old fart.

 

30 psi with stock stud, wow! your not a chicken!

If I would to open the head to put cam or something like that, I would put stud for sure by the same way but for now...

I like the comments for the EGT, I think that the next thing I would have to do, there's a lot to do with that info after. Last time I went lapping, after a 20minutes sessions, my o2 housing(modify) was fire red! I was not sure if it's normal or not and it was the time that I stop or I would have burn something. If I had that EGT, I could I know if everything was alright...

 

if you have a wideband O2 gauge setup can it work to get an idea of elevating egt temps? Say your egt temps go up, wouldn't that translate into a lean reading from your wideband?

 

It might effect it a small amount but at high boost/backpressure a stock framed turbo would have elevated egt's. You really should have a gauge on it or road course tune on the right fuel. E85 is a good fuel for its cooling properties but high consumption and quality are a problem.

 

Where's the best place to install the gauge?
Just weld a bung in the front of the downpipe?