Originally Posted by BLKCarbonEVO

Wow good advice from you there! I would like to hear why you think 500tq at 4000rpm is safer than 300tq at 8000rpms. I don't agree with that at all!!!

At 4000rpms your crank has a lower rotational inertia requiring a lot more stress on the rods for the initial tq spike to get you crank spinning at required rate that happens to be extremely fast (when talking about small turbos with a tq spike over 200tq within 200rpms). This is why everyone folds rods at 3.5-4k. Also a turbo that spools faster has a higher stress factor on the rods than a turbo that spools slower and later in the powerband.

Now 300tq at 8000rpms is very safe! 300tq at 4000rpms is more threatening! Your crank/rods are already holding 300tq from the initial spike and it is easy to hold that safely throughout the powerband. You don't fold rods in higher rpms. The only thing that happens in higher rpms is you throw a rod, which is your rod bolt letting loose. This doesn't happen near as often as a rod folding at tq spike around 4k! The only time you will ever worry about throwing a rod in a built motor is if you are 700+hp and miss **** and the ***** going to 10k+. Otherwise the aftermarket rods have great rod bolts and they hold up quite well. People on stock motors will break rod bolts if you rev above 8k rpms to many times. The stock rod bolts will stretch and snap, throwing a rod out the block. Not usually a problem with a built motor.

There are a lot stock turbo cars folding rods at a 350tq spike because of the fast spool of the stock turbo and the load of the tq is very low in rpms over a fast rate! That is why very few FP Red cars running 450+tq (over 100tq more than a stock turbo and most 500hp+) are not blowing their motors because of the tq load being higher in the powerband and a slow spike rate spread out across the powerband. A stock motor with a larger turbo with the same 350 tq spike as a smaller turbo will last much much longer than the motor with the smaller turbo. It is a given fact. We see it everyday up here in the NW!

Mikey

Originally Posted by 94AWDcoupe

Mikey , you have to stop responding. everything you say is technically way off. seriously get yourself a copy of "maximum boost" read the first chapter. then get back to this thread if you can bear to correct all your bad posts. when you understand my statement "500tq at 4000rpm is easier on an engine than 300tq at 8000rpm"
we might be able to have a nice discussion. this statement is 100% true and can be verified by the math given in the first chapter of corkys book.

Originally Posted by 94AWDcoupe

I dont think anyone ever planned to run 2.3/16g setup. its been done with plans of running a larger turbo,. If your plan is to run a 16g then stay 2.0. makes a better power curve.

Originally Posted by big block ix

I'm putting a 2 L in my car this very minute. The 2.3L is almost out. I suggest you keep your pistons as vertical as possible in the cylinder and go 2.0L