im replacing the bottom end in my motor(99 gsr), new everything. Thing is im strapped for cash, and this is my only daily driveable car. Ok well got all oem rebuild kit, and my friend had a set of brand new CTR pistons and rods. Im running s2 stg 1 cams, and unported head. and the usual bolt ons. I kno its gonna need tuned, but who has ran this setup and why is there so much hype about these pistons, i dont see what the difference is between these and after market 12:5:1 pistons? and i'll always be running 93/94 octane. and i did search for this but i didnt get the answers i wanted thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2literteg &raquo;</TD></TR><TR><TD CLASS="quote">im replacing the bottom end in my motor(99 gsr), new everything. Thing is im strapped for cash, and this is my only daily driveable car. Ok well got all oem rebuild kit, and my friend had a set of brand new CTR pistons and rods. Im running s2 stg 1 cams, and unported head. and the usual bolt ons. I kno its gonna need tuned, but who has ran this setup and why is there so much hype about these pistons, i dont see what the difference is between these and after market 12:5:1 pistons? and i'll always be running 93/94 octane. and i did search for this but i didnt get the answers i wanted thanks</TD></TR></TABLE>

The "hype" is about people who don't understand the difference in compression height that the CTR's hold over the "Standard" other B series choices (PR3's, P72, etc). Even the ITR pistons have a different compression height over the stock P72 units. With CTR pistons and a GSR head, you will be at 13:1 compression. Not exactly "ideal" for street, even with the higher octane fuel. Personally, I would run the JDM ITR pistons. This will get you 11.5:1. If you want more, run some flat faced valves and you will be just shy of, if not at 12:1. More then enough compression for those cams and room to expand later on down the road. The CTR's not only yield a high compression ratio, but also carry large, heavy domes. The domes not only add quite a bit of weight to the piston but also make for poor flame travel. Less then ideal in my opinion.

 

so basically i just f'd myself on ordering CTR pistons? now when it comes to b16b's and b18c i kno the stroke is different and the heads are hand ported and have bigger cams, shorter stroke etc. i dont see how big the difference is? i hear 34690736 different things about these pistons, i've had people say they will be fine with a tune..then people say my motor wont last long. so basically i should cancel the order tom. and order ITRs

 

i hate CTR pistons
1. have to yank timing as to not detonate ( loss of power)
2. flame travel sucks ( trying to get over circus tents)
4. don't make a significant power increase over ITR pistons
just my 2 cents though

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2literteg &raquo;</TD></TR><TR><TD CLASS="quote">so basically i should cancel the order tom. and order ITRs</TD></TR></TABLE>

.....basically....

agree with what whitfield posted...

 

ok i emailed the company, and they luckily changed the order to ITR pistons, and i also went ahead and ordered supertech valve springs and valves. should be good to go, thanks for the help

 

try to get the jdm itr's they yeaild a little higher compression over the usdm's

 

this kid round here got ctrs and hes put like 10 15 000 miles on his car.

 

Cool.

My uncles best friends brother in law ran them with 87 octane.

 

I live in south texas. I ran the same set up for the last four years. I just retune it three months ago and still put down 196 to the wheel. My set up
Poor man type r with dtr header, ctr pistons, s2 s1 cams, chipped p28 tune on vafc

 

I think the whole point of what has been said in this thread is that while it's possible to run CTR's and make decent power, it doesn't mean they are the best choice. People fail to remember that the more compression they run, with the more radical piston design and engine setup, the LESS margin for error there is on the tune, running on pump gas and a number of other things.

You can run this setup but that doesn't mean it's the best setup or will make more power, safely over JDM ITR pistons for example. Not everyone has access to a GOOD tuner or decent gas so it makes sense to be smart about the way you choose to build the engine in the first place.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by doc_tai &raquo;</TD></TR><TR><TD CLASS="quote"> I live in south texas. I ran the same set up for the last four years. I just retune it three months ago and still put down 196 to the wheel. My set up
Poor man type r with dtr header, ctr pistons, s2 s1 cams, chipped p28 tune on vafc </TD></TR></TABLE>

Congratulations. With the same cams and only 11.2:1 compression vs your 12.7:1, I made 185 with a shitty DC sports header. That was "un tuned" also. Head was untouched. My point still stands... You can run them, sure... but the amount of timing you will pull and the whole idea of riding on the edge just doesn't seem to make sense for a street engine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hybrid93Eg &raquo;</TD></TR><TR><TD CLASS="quote">

Congratulations. With the same cams and only 11.2:1 compression vs your 12.7:1, I made 185 with a shitty DC sports header. That was "un tuned" also. Head was untouched. My point still stands... You can run them, sure... but the amount of timing you will pull and the whole idea of riding on the edge just doesn't seem to make sense for a street engine.</TD></TR></TABLE> Agreed

 

well the jdm ITR's got shipped out today. so next week build time starts. I'll post up a little build thread so you guys can check it out.

im gonna be running, b18c1,itr's pistons,acl bearings for the bottom end. head will be not touched for now besides the cams. greddy evo2 exhaust,s2 manifold,arc intake,dc 421 (junk) so if anyone has a header for sale lmk.

also what ecu you should i invest in for going to obd1 conversion p28 or obd1 p72. it will be tuned on crome

thanks for the tips btw