Feeler: CP Pistons, Medium Comp, 10:1

tibal

You forgot me! In from day one!!

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2010 - PG - M6 - 370zTT 453/409 6lbs

phunk

OK I just got off the phone with CP.

So there is good news and bad news. The bad news first... my original quote no longer applies, prices have gone up. Enough that it might effect peoples decision to be in on this or not. I am not really sure why this is, I am thinking there was some sort of communication error.

This is my quoted cost, no markup (which says how much pricing has changed because in my original pricing I was making a few bucks on it):

10:1, .020 over, HD Pistons (designed for 700+ crank), $804
Heavy Duty Wrist Pin Upgrade, $54 (you want this)
Coatings: $20 per piston for dome, $20 per piston for skirt
Plus shipping and CC fees.

If you guys still want in, I will do it at a wash and show the invoice.

Quoted timeframe if we order by early next week, 4-5 weeks.

I am still in. Anyone else?

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Chuck33079

I guess I'm out if you're doing this now. Am I correct in assuming I can still get a single set of these at any time, albeit at higher cost?

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

phunk

Yup we can get them any time. I *might* grab a set or two extra for stock... But I am leaning more towards stocking a custom piston for hr/VHR compatibility

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Chuck33079

Good deal. Between homeowners insurance, Xmas, two birthdays and property tax, there's no way in hell I need to be dropping a grand right now on car parts I won't be using for 25k miles.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

OMGWTFBBQ

I know some people are in a hurry (maybe) to get these pistons, but I'm with Chuck. If nobody's dying to get the pistons, would it make sense to push the GB back into January?

Not speaking for the crowd, but it would definitely help me out considering the holidays (big $$$ expenses) are here and whatnot.

phunk

You know that is a great idea. Anyone who wants pistons is going to want rods also. The only negative to that is having to pay for both at once.

I will inquire Friday if they are open, otherwise Monday. I am going to talk about pricing with them again because I think we should get a little better.

As for holding off until after holidays, I am extremely open to that. I have so much custom work to finish for my new engine that I won't need the pistons and rods for a few months.

It's really up to you guys. I was trying to push this forward to get cosmo taken care of, but if we need to wait and he has to go solo for now, it is what it is.

We have to get to the point of solid communication with one another to come to a compromise on timing.. So speak up everyone!

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COSMO

Listen guys I cant wait another 4 weeks for the group buy and then another 4-5 weeks for them to be built. I am sorry but really don't have a problem paying for a custom set now. Please let me know what your planning to do so I can move forward with my build and again I am sorry..
Happy Holidays

DEpointfive0

I don't want any of this stuff, but I'm with you. Do what you gotta do. People should jump in on YOUR buy right now.
Do what you gotta do, can't wait to see it up and running again, real tune at Z1, and awesome numbers

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Staples

I would be open for a group buy myself. I haven't been on the forums much lately and this sounds great. I was looking for a set of 10:1 pistons. I already have a short block stripped with crank assembled, just need pistons, rods, plus a few other things.

I'm in no rush for this, so whenever.

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'08 Infiniti G37s - Forced Induction Fed

djtodd

I'm in no particular hurry at the moment either. After the first of the year would work just fine for me. I have a spare engine in the garage anyway if mine does go tits up.

As for the hr/vhr question, I really don't have any realistic plans to do an hr head swap, so I'd prefer normal vhr pistons.

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OldBoy

Phunk, any news on a price for the pistons and rods combo?

phunk

Sorry it has been a hectic week taking delivery of a new CNC. I will get information for you about this this week!

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Unique_Z

Phunk, forgive my noobness but does this have any good gains for NA? Cause from what i saw, most of the names on the GB list is already on FI

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My Z Build
UniqueZ

phunk

These pistons would cost you a little power in a NA car.

The factory compression ratio is 11:1. These pistons are 10:1. Reducing the engines natural compression ratio will reduce overall power output at any given airflow.

When people decide to upgrade their internals for more horsepower with a boosted engine, if that engine was considered a "high compression" engine in its original form, then it is common to slightly lower the compression ratio. So this is a typical procedure when doing an engine build for a NA car converted to FI.

High compression ratios are ideal for overall power and efficiency. However, once you force more air in with boost, the high compression ratio really starts to compound the pre-ignition cylinder pressures. Too much heat and pressure can cause the air-fuel mixture to self ignite early, before the spark plug sets it off. This is very bad for the engine.

So it is a balancing act. Like every choice we have to make in a performance car, there are compromises. For the sake of maximized efficiency, you want the compression ratio as high as possible. Luckily, the VQ37VHR makes lots of power with very little boost pressure. Most people will never even attempt to run as much boost as, for example, a *stock* Evo X runs. Those who go so far, would have one of the most powerful VQ's around. So, generally we do not have to lower our compression ratio nearly as much as other guys. This is great because it lets our engine be more powerful and responsive without using the boost as a crutch. Cars like EVOs and STIs drive rather poorly in comparison due to having extremely low natural power output.

Sorry if I went overboard and touched on things you already know. Just covering all bases!

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