Muffo

Yeh i know this but i havent found anybody that makes them at the same price as a standard set and that are quiet cheap for a standard set. It would cost me about 2k here just for the pistons instead of for pistons, rods and cams. I havent been able to do any work on the c20at for a month as i have been on a couple of short holidays and the only day i had a chance it was 43 degrees so it was way to hot in the shed. So far i have the wiring loome learly off the c27 and have the turbo except for 1 bolt removed to get at the wiring under it. Its prity amazing how much of the support wiring that isnt connected the the computer is different. Like all the wiring to the startermotor and that area is completely different and will have to be rewired completely not just swaped over. On the bright side my car fund is looking better and better

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legend89chopped

A local machine shop quoted me $1200 for forged pistons, bigger set of rods, and a nitrate treatment for the crank, but I'm not even doing internals this year, I don't think.

You also mentioned in another thread you were looking for a GT3076 or 71 turbo. I ended up getting the 76R, and I couldn't find a new one for less than $1149 US. Came with polished housing, though, and my choice out of 3 turbine housing a/r sizes.

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Muffo

I want the 76 I found a new 1 for 600 with a 2 year warranty but it wasnt a garret. so i decided i would wait till i have the c20at up and running before i worried about it. was the 1200 including pins and pin fitting. Also how much less do you think they would do it without the crank as i have to get that done over here as postage would be way to much

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legendturbo

bear in mind the gt30 might be a bit small for the 2.7

Muffo

Ya think? looking at the compressor map and air flowed i thought it was somewhere in the ball park and is rated from just over 300 to 500 hp

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legendturbo

Yeah.... haha I think I tend to go overkill. You should make 400whp with it with a reasonable response which will be especially important if you cannot find a manual tranny.

legend89chopped

Yeah, the price included pins, bolts, and bearings all the way to the crank journals. Basically the whole bottom end. I don't know how much the nitrate treatment was separately, but I'll find out.

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Muffo

hmm this sounds like a better deal than off paeco. What compression pistons are you going to use

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Muffo

Just going by the current garrett range this seems to be about the best option that is ball bearing. there are some that would suit that are bigger but are journal bearing

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legendturbo

There really isn't that huge a difference between journal and BB. BB does spool ever so slightly faster but many people think they are the same. Basically do not let that be a huge deciding factor.

Muffo

No but it is an advantage and the 3076 should be fine at 340 hp which is my aim and should take me higher if i want. Not saying i wont get something else il take wat ever comes at the right price

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legend89chopped

Yeah the 3076 seemed best. With a small exhaust housing, it'll spool real quick, but you can put one on as big as 1.06 a/r, and have as much hp as you think that engine could handle. That's why I got it. It's good for now with lower boost on a stock build, and later on I can just switch housings and tune for high revving.

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legend89chopped

And the pistons I got quoted are a stock shaped head, just made with lighter alloy and more meat for strength. I'm using tapered rings to lower the compression, because it doesn't have to come down much.

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Muffo

so will they be forged? I thought it would be best to just go all the way and lower it down to around 8 so for the sake 90 bucks just get the pistons at a lower compression

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legendturbo

I assume you are talking about compression ratio. Do not go down to 8. You gain very little while losing a lot. 9 is the recommended number for any seriously modified street car. 8 and you will lose a lot of off boost torque. You can safely boost to high numbers ie over 20psi safely at 9:1. Of course over 9:1 and you may start to run into trouble.