http://cgi.ebay.com/ebaymotors/ws/eB...tem=7918858400

Email me through ebay with any questions.
Mods: I need the turbocharged/supercharged exposure Thank you

 

Why are you selling though? What Process would have to take place in order to get these installed, and is it a job that could be done by myself or should I hire someone, in that case how many hours of labor would you think?

I will be installing the Turbo Kit soon, what are the benefits of these?

Thanks,
JP

 

I am selling because I sold my car long ago, I now have an all motor 350z.
Im not sure if you could do it yourself, but I doubt it. It wont be too much, considering the gains and reliabilty you will get. These will allow you to boost much higher and stay cooler.

 

Wow, let me try to find money. Do these come with the rings?

 

Whats the piston diameter? WHat would you have to bore the block too to make them fit?

 

They come with rings, forgot to mention that.

They are stock bore, I tested them out and they run very very smooth, and are within good spec of 9:1.

 

Mardigras, what ever happened to your 3.5L Turbo project? Havent been to maxima.org for a long time. Any 10 sec maximas yet?

 

sounds like a good deal.

 

These can be installed just as if they are an OEM fit?? If so id definatly be interested. What is the stock piston compression?

 

So tempting...... must... resist.....

Weren't these on ebay a couple of months ago? I believe I bid on them.

 

ya what happend to the last auction? http://cgi.ebay.com/ebaymotors/ws/eB...e=STRK:MEWA:IT
They went for $340, that guy back out????

So these were not damaged in any way? I thought the motor was damaged because your mechanic installed them wrong?

 

Im relisting them because they guy didnt pay.
They will replace your factory OEM Pistons that are 10:1 CR I believe

They are not damaged, I backed out of building up my motor because I was having problems with XS Engineering and theyre prices, so I decided to sell everything and go all motor, hence I now drive a 350z. Hopefully in the pics you can see they dont have any scratches, very precise, smooth.

If you are the winning bidder and are unhappy with the pistons in any way I will gladly refund your money and resell them. If you have any other questions about the pistons specs etc, you may contact Probe Industries. http://www.probeindustries.com/
310-784-2977
This is a great deal guys!!
I wanna see some big HP out of those VQ30's

 

I blew out 3rd gear in my trans So the motor has been delayed.

 

Will these pistons even work well for a supercharger setup at higher PSI like say the 2.87 pulley? or would they be more or less unnecessary

 

XS-Engineering has really low prices on their parts, usually half what it would cost for another name brand.

 

Well, here are my thoughts on the subject.

If you are running the stock ecu (meaning you have the stock timing maps for NA operation), then you need some way to inhibit detonation once you get above 11-12 psi. Lowering the afr helps some, but that will only go so far before you start losing power, and it becomes less effective in suppressing detonation when your boost pressure gets high enough. Water injection is very effective in suppressing detonation and a lot of boosted people are doing that. Water injection has the added benefit of keeping your cylinder heads and pistons free of carbon buildup that can be the cause of preignition and detonation.

Lower compression pistons are very effective for a turbocharged engine because full boost occurs at a much lower rpm so there is time for significant heat buildup as you boost your way to redline. Lower compression pistons significantly reduce cylinder temps as well as the pressure required to cause detonation.

In a centrifugally supercharged engine the slower buildup in boost pressure over rpm results in a much less severe environment inside the cylinder head until you get to high rpm, so you don't really need detonation suppression measures until you get to the last 500-1000 rpm before redline. But lowered compression affects all aspects of engine operation, whether boosting or not. Chances are you probably won't notice too much of a change going from 10:1 down to 9:1, but you will lose a little bit of crispness in engine response. It gets worse when you get down to the 8:1 range. There you sacrifice a lot of what makes the VQ engine enjoyable to drive (e.g. torque, throttle response) for those few moments when you are at wide open throttle. Cars running very low compression so they can run very high boost have a binary feel to them - they are very mushy during normal driving, and then transform into a beast at WOT.

A better alternative (in my opinion) for centrifugally supercharged Maximas is to pull timing in order to suppress detonation. There are two ways available to us to do that (maybe more, but this is what I know of) - reprogram the ecu via JWT or Tecnosquare, or retard timing at the onset of detonation using the J&S Ultra Safeguard. The J&S can also pull timing based on boost pressure. A reprogrammed ecu has the added benefit of extending the fuel cut rpm.

 

could he get away with a water/alchol injection setup?

 

Sure. I would be maybe a little bit worried about it being not absolutely fail safe, though.

 

Nice post Stephen. You don't want anything lower then 9:1 on a SC or like Stephen said, low-end will suffer.

For around $250(eBay used), you can get an eManage, support tool, and cable to retard timing per RPM(perfect for SC) or boost if you add a pressure sensor(best for TC).

Not to knock these, but there was a fiasco with XS-engineering saying the engine was fuked and he would need to pay big money to get it fixed. Apparently, his mechanic who built the motor, disagreed, yet he tore the engine apart and is now selling slightly used pistons?

http://forums.maxima.org/showthread....34#post2893834

http://forums.maxima.org/showthread.php?t=304486

 

Yes, its called XS was lying out their @ss. I do not recomend anyone to go there. "$100/hr and the PFI turbo kit needed major work to be installed that was gonna be atleast a 15-20 hour job." $2,000 for install and that didnt include gauges+ stand alone install+ tuning. I didn't have another 5k to spend on top of the 5k turbo kit. Not to mention they were giving me **** about my motor, when my old mechainc took apart the motor to give me the pistons and rods, he looked over it again and said it was built perfectly fine and XS was on crack.

But besides the fact, the pistons are basically brand new, take my word for it, or just go look at the pics on ebay. Like I said before, if you are not satisifed I will gladly refund your money.

 

Are you I30tJim or BrianV and why do you switch back and forth?

 

One is in TX and one is in CA. Weird.

 

He uses Brian's computer occasionally. I think Brian left it with him when Brian moved to Austin.

 

Within minutes of each other?

I mean ASSuming he's not some geek with two terminals side by side, once he logs in as I30tJim the cookies are changed.

Anyways, just weird.

 

weird.

I am justs aying they have affordable parts. They could be *******s.

 

lol...im i30tjim, sorry, i needed to use the search function real quick.
Anyways XS seemed like good guys they just were very very expensive.
The pistons sold for 450 to pawnstar. Thanks guys.