SR20DET going to machine shop tomorrow

[tokendog]

Ok so I am taking the engine to the machine shop tomorrow. I had what I believe to be valve vs. piston impact damage...

I was going to originally go with just a full stock rebuild but decided to go ahead and have the block/head built for 300+ HP.

I have the stock t25 on the car at the moment with FMIC, Mishimoto radiator, Profec II Boost controller, etc..

I want to do pistons, valves, springs, etc. as well as hot tanking it to clean it up, port/polish, and 3 angle-valve job.

I do not know that much about machine shops and what they are capable of, but what I am looking for is advice on parts to go in to the build. I have around 2500 to 3,000 $ available for the build and I want to reach 300HP but have the car be able to go much higher with just fuel upgrades and a new turbo (and tune, of course).

I plan on going with an Enthralpy tune.

So far I have my eyes on the Enjuku's BC package for $800. I may or may not upgrade my cams to 264s, as I heard this creates more low-end lag and I'm running the t25 at the moment.

Please give any advice you can and help me spend my money for reliability and power :>

Thanks in advance!!!

[tokendog]

Since no one has replied, I'll post up the part list I've pieced together so far...

BC cams (264), BC springs, BC valves, and Ti Retainers.CP Pistons 8:1Eagle connecting rodsClevitte bearingsCosworth HeadgasketARP head studs

Also getting a port/polish, 3 angle valve job, and hot tank. Getting a rebuild basically with the above parts instead of OEM parts.

I think that should pretty much set me up for 300ish HP?
Modified by tokendog at 11:20 PM 11/17/2009

[240SXmotoring]

so you want 300rwhp on a T25?

List looks great so far.,

[tokendog]

No, not on a T25. I will get a new turbo before I try to reach 300hp. I am going to drive it at 300hp for a bit, get used to it, and then go further. I just want the block/head ready for way more than 300hp.

I'd say 400hp is as far as I will want to go, if that far, but I want the engine to be ready and as reliable as possible.

I am taking it in a little bit and just want to make sure I have a good setup before I go.

[pauliedrft]

Why not go for 9/1 compression ? If your going to tune it for around 300 you should be able to run them im still trying to figure this stuff out for myself so any imput would be nice .But your list looks good so far .I would go for 740cc injectors so you can build more horse power later if you want .the KEY to a build is leave room to grow .I said i would be happy if i just ran 9psi on my t3t4 top mount well now im at 12 psi and i want more like 17 to 20 .But traction problems so now i need wider tires and rims well this is how the list goes .Just trying to help give you an idea of what to look at when doing your build that i didnt expect .

[tokendog]

What exactly does changing the compression ratio do? Give you higher HP but lower amount of boost?

[shift_SRDETuser]

the bottom ends on sr20s handle 400whp so why mess with it? A t25 at 300 rwhp is kinda tough you will need a gt2871 or so.

[newbe240owner]

to answer your ? about what does higher compresion do, basicly as the piston goes up it compresses the air inside it. the higher the ratio of fuel particles to air particles the more voilent of a reaction you get which means a bigger boom, bigger boom means more hp. you tend to see higher compresion in na motors because they dont have a turbo forcing air into it. im bad at trying to explian stuff so i hope i helped a little bit. but as far as your engine build goes you should have no problem with going to a higher comp. ratio with the forged internal they should be able to handle that. and hey if you want to evantually go with higher boost and want to lower the comp just put on a thicker head gasket. like a 1.3mm