tale of two pistons

[ben91]

I own both types. Which would you use? Pick one and state why.


Wiseco 10:1 84mm
JE 9:1 84.5mm


Goals: Big spool, big midrange, response. Will have headwork. I'm leaning towards the Wisecos.

[Reverend Greg]

If you CC the heads,it will lower the comp.ratio slightly,then go with the Wisecos.Be different,just be sure of your tune when you turn up the boost.This is not unprecedented.
-G-

[Pitt]

If you're gonna go for more power and take the engine apart, why not just go ahead and make it a stroker so you'll have a billet crank too, and it will handle all the POWER you can give it.

[redrumracer]

If you're gonna go for more power and take the engine apart, why not just go ahead and make it a stroker so you'll have a billet crank too, and it will handle all the POWER you can give it.
why do that when the factory one is forged? other than the stroker benefits

i say the lower comp ones since your boosted.

[MoD_Scotty]

Lower compression, more boost, leaner tune.

[miatamike]

yes i say 2.0 it 10:1 or if you want to be like me i want to 11:1 and 2.0 and run 20psi on a gt35r and a tune that will take a good week to do so that it is just right

[Jack-MX5ATLanta.com]

I would go for the higher compression ones. Makes the feel of the car much more on it. You'll be able to the high boost thing as it is so it balances it out a bit my book. Makes it more well rounded.

[ben91]

If you CC the heads,it will lower the comp.ratio slightly,then go with the Wisecos.Be different,just be sure of your tune when you turn up the boost.This is not unprecedented.
-G-
I would go for the higher compression ones. Makes the feel of the car much more on it. You'll be able to the high boost thing as it is so it balances it out a bit my book. Makes it more well rounded.^^These two posts sum my opinion on the matter.

If you're gonna go for more power and take the engine apart, why not just go ahead and make it a stroker so you'll have a billet crank too, and it will handle all the POWER you can give it.Uhm stroker = +$5K more and obsoletes the pistons and rods I already own. That's a price range that is stupid to go to when I can get an LS1 from a junkyard for less.

BTW depending on pistons used, the motor will already by 19XX cc's.

Lower compression, more boost, leaner tune.Sluggy response, less economy, less spool. IMO spool and response > ultimate power. I want a drivable car. Not a highway drag car (miatas suck at that).

yes i say 2.0 it 10:1 or if you want to be like me i want to 11:1 and 2.0 and run 20psi on a gt35r and a tune that will take a good week to do so that it is just rightyeah uhm no. my last car took a year to tune where I was happy with it. including 3 trips to the load dyno.

[Oblio]

Sounds like you have it figured out Ben. When are we coming over to pull your engine?

[ben91]

No need. I have a beautiful 20K 01 motor in the garage. ;)

I think the only thing I have remaining to buy is an ATI Damper. It's a fairly big $$$ item so I think it's all going to wait until after I have the MSM bumpers painted.

[RotorNutFD3S]

Ben, we've had multiple discussions on this one before, and our agreements (going with the higher compression) I still feel are correct in theory, however, after driving my car (9:1) and not really being able to get on it with a lot of boost, it still feels just as lively as Britt's 9.5:1 2000 and Kris' 10:1 2003. And because I haven't gotten on it, I got 29mpg on the last tank and that's without retuning the Link.
I now really don't think it makes a bit of difference unless you were comparing 8.8:1 to 11:1, but 9 to 10, negligible. I'd go with what supports boost better and more safely, 9:1.

[miatamike]

i like the guy at were i work 11:1 aand 25 psi on pump makes 700whp and 680wtq but that car is tuned to no end let see if any one can guess what car it is ill say this its 2.0 and awd.

[Jack-MX5ATLanta.com]

Evo

[miatamike]

^^

yeah uhm no. my last car took a year to tune where I was happy with it. including 3 trips to the load dyno.

lol i just go to my boss and be like i need to use the dyno this sunday and he goes ok have fun :D well he is my x boss but he still lets me jump on the dyno on sundays

[Doppelgänger]

With a built motor, you can benefit from the high comp. piston more. Rmember, the pistons aren't known to be the weak point...it's the rods. I'd be willign to be that off-boost economy will be slightly better with the 10:1 as well as a bit better spool. I've always been a fan of high comp. low(er) boost setups...though they require a bit more tuning, I feel it would be just as safe.

[wildfire0310]

well if you have good fuel and timing management. AKA not that exede crap but something more like Hydra, Adaptonic(sp) for maybe even an MS2 or 3. I would go with the 10:1, if price is close.

reasons:

pros::
better off boost performance
faster spool... granted maybe by only a 100-200 but still worth noteing
more power netted per PSI. again not much but still.

Cons:
more touchy on tuning. It going to be easier to get detention vs a 9:1

giving the small differences of a 9:1 and 10:1 the gains aren't going to be huge but the more psi you run with a higher your gains will be compared to a 9:1.

Granted it all factors into cost. if the 10:1 are way more then the 9:1. I would just go with the 9:1 but if the cost is close or just mildly more. 10:1 are my vote.

[ben91]

With a built motor, you can benefit from the high comp. piston more. Rmember, the pistons aren't known to be the weak point...it's the rods. I'd be willign to be that off-boost economy will be slightly better with the 10:1 as well as a bit better spool. I've always been a fan of high comp. low(er) boost setups...though they require a bit more tuning, I feel it would be just as safe.
Dude you know I have a set of CAT rods too. :p

[Doppelgänger]

Dude you know I have a set of CAT rods too. :p
exactly... which is why I said what I said...

[ben91]

exactly... which is why I said what I said...Then me's and you's agree :hi5:

[ben91]

Ben, we've had multiple discussions on this one before, and our agreements (going with the higher compression) I still feel are correct in theory, however, after driving my car (9:1) and not really being able to get on it with a lot of boost, it still feels just as lively as Britt's 9.5:1 2000 and Kris' 10:1 2003. And because I haven't gotten on it, I got 29mpg on the last tank and that's without retuning the Link.
I now really don't think it makes a bit of difference unless you were comparing 8.8:1 to 11:1, but 9 to 10, negligible. I'd go with what supports boost better and more safely, 9:1.Keep in mind headwork will lower compression.

I'm still wondering if I should sell both sets of pistons and get FM's 11:1 wisecos. With headwork it will be 10:1. 1950cc 10:1 w GT2871r FTMFW, no? :banana:
Ripping a quote from Gwen Stefani, "Take a chance you stupid ho."

[Reverend Greg]

Man, I need to brush up on my forum speak:o