View Full Version : Replacing gaskets and valvesprings at 1 bar+ HYPE?

11-14-2002, 10:41 PM
I was just wondering if the whole replacing valve springs and headgasket was even needed or if it was just a sales gimmic. I am sure at a certain level you would need to upgrade them but is 1bar really the limit. (not talking about the effeciency level of the turbo) Thanks

11-15-2002, 01:36 AM
If you want to be safe it is a smart idea. Unless you plan on running race gas all the time.

11-15-2002, 01:59 AM
the stock headgasket is supposedly good for up to 21 lbs of boost. but if you have the money and time and want to be safe why not

11-15-2002, 02:20 AM
i'm leaving my valve springs and head gasket stock and i paln to run 20lbs at the track and 15 on a daily basis on my t25/t3.
think i'm crazy?

11-15-2002, 02:34 AM
I would say yes. I did some research and many people seem to pop theirs when they push 17lbs or more. Unless you run race gas you will likely have problems. Not sure on the valve springs though.

11-15-2002, 02:39 AM
where's your research? (not flaming- i would like to read it for myself though)
anyway- every time i've gone to the track i've purchased at least 4 gallons of the 116 octane. (stock turbo at 16 lbs)
i have a feeling that i'll be fine...

11-15-2002, 02:43 AM
Probably should be. I asked the question on here a couple months back about the limitations of the head gasket. The consensus tended to be unless you were running high octane fuel that the gasket would pop at around 17lbs. Never tried it myself, mainly because i don't want to have to redo the head over and over.

11-15-2002, 09:16 AM
it might start to lift but it sure as hell wont pop

11-15-2002, 12:44 PM
Other than the elevated boost level, I'm trying to think of how in the heck the Octane of fuel you run would have anything to do with the headgasket. Maybe lower octane fuel at higher boost causes it to deteriorate faster ? Can someone explain this to me 'technically', cuz it's not making much 'logical' sense. I think you have to be more concerned about boost than you do fuel, as far as that gasket is concerned.

11-15-2002, 01:59 PM
Avoiding any detonation with the higher octane...otherwise you go POP!

11-15-2002, 02:06 PM
I don't think (NOTE: I said think) that the valve springs have much to do with the boost you are running but rather the cams and rpm of your redline. Someone please correct me if I am wrong.

11-15-2002, 03:10 PM
You are correct, sir.

11-15-2002, 03:48 PM
In other words, the shop trying to sell this is trying to make a quick buck off you.


11-15-2002, 05:23 PM
AHHH I am glad that I asked now becaue I was bout to purchase these two products. I still will when I order the BigT28. now I am extremely glad that I asked this question. I now can plan to spend my money in other ways for now.

11-15-2002, 05:29 PM
I dont think the headgasket is a waste of money, the valve springs could be, but the headgasket is generally important unless you run high octane fuel. If you plan on going with 15 to 16 lbs of boost you will be ok, anymore than that and its a risk.

11-15-2002, 05:40 PM
Headgasket is a decent idea if you are upgrading the turbo. The T25 will poop out before it generates enough boost to warrant a headgasket. A RAS is a nice safeguard if you tend to bounce off the rev limiter. Upgrade your valvetrain if you increase your redline or go with higher-lift cams.

11-15-2002, 06:09 PM
They (the valve springs) do play a small part in the boost you run. What the valve springs do is force the valves closed, right (knod your head up and down), well when you add boost it is trying to push the valves open. So the more boost you run the less effective spring rate your springs are. I am sure that normal boost pressures and old valve springs are safe, but when you start upping the boost (and/or adding some cams) and have old valve springs it may become a problem. I am sure you will be safe without upgrading the valve springs, but don't think boost doesn't effect valve springs, because it does.

11-15-2002, 07:51 PM
where the hell do u get 116 octane gas..i live in central cali..the highest is 100 here unleaded..

11-16-2002, 01:31 AM
</font><blockquote><font class="small[/img]In reply to:</font><hr />
where the hell do u get 116 octane gas..i live in central cali..the highest is 100 here unleaded..

[/QUOTE] Raceway Park, Englishtown, NJ
they sell various high octanes at the race track...

11-16-2002, 03:13 AM
the highest at englishtown, unleaded, is also 100.
i buy the leaded 116 only when i drag race.
a few times i bought a 1/2 tank of the 100 unleaded because i didn't always want to run the leaded.
i'm going to keep track of how many gallons of leaded gas it will take to destroy my o2 sensor. http://forums.freshalloy.com/ubbthreads/images/icons/grin.gif

11-16-2002, 06:42 AM
Im glad they have 94 pump here hehe http://forums.freshalloy.com/ubbthreads/images/icons/grin.gif

11-16-2002, 09:54 AM
I think you have to rate a headgasket at raw HP and not PSI. The headgasket gets stressed durring compustion, so what the pressure was in the cylinder before compression doesn't matter. So a stock motor and turbo at 1 bar wont phase it, but with a higher flowing setup it could.

11-16-2002, 12:16 PM
In any case it is always a good thing to upgrade the head gasket for the simple reason that it will allow you to upgrade your setup as you want instead of having to do the head to add more goodies. Its a good idea to get done, money well spent.