Thats ok I plan on 9ish PSI, A hopefully good tune, Test Pipe and that should suffice for the summer, when my stock clutch goes, Ill look into just applying the 300 or so WHP more efficiently..........


PS Is it not possible to buy a slightly larger Turbo later down the road?

 

I'm sure you could but the big question would be does it fit? And when you add in cost, your dangerously close to inlinepro territory where your horsepower could be doubled.

 

Oops, 80 to 85 is a little shy of what engine builders on the west coast are using. Out here with ARP studs they use 95 - 100 ft lbs with the lube. They also recommend doing a re-torque with the studs.

 

When you get the ARP head studs, there is a piece of paper which states what the studs are to be torqued to. On my wife's Evo it was around 80ft-lbs (don't remember for sure). We used the OEM HG, no copper spray, re-torqued them after a few heat cycles and have had no issue.

There shouldn't be any difference with the S2000. Any failures have got to be attributed to installation error.

 

Good thread... but does anyone actually know which ARP headstuds to use for the AP2 S2000 and the actual torque they recommend or are people still using the Prelude ones I read about earlier, and going from there??

 

Here is a link to the correct head studs:

http://www.kingmotorsports.com/category.aspx?cat=69

They are not the same part number as the studs for the Prelude. The studs will include the special moly lube from ARP as well as the torque specs.

 

i can get you some head studs for $155 - pm me

I would only use the headstuds - if going with a thicker head gasket you will loose that thickness of threads (3mil)- and remember you are going into an aluminum block. so studs allow more threads to pull from.

 

anyone else?

 

Its hard to say really. You are whats called "knock limited" when it comes to high compression and pump gas.

Def not with the gt30 on the prototype setup I made. I was able to almost max out a gt3076r on pump gas (93 octane) w/ the stock motor.

Simply put, when you add the 3mm HG, you will have to run more boost to make the same power as you would w/ the stock HG on lower boost.

 

Well you are certainly entitled to your own opinion, but I dont agree with that what so ever.

Dont base your claim on static compression. thats just one part of the equation.

boost pressure isnt everything. pressure vs. flow changes drastically depending upon the turbo setup.

there isnt a magic boost pressure that limits you. There are much more factors involved.