If I rebuild my motor would it be best to keep my CR as close to stock as possible, or take it up a bit. A while back people were saying its best to have a little higher CR, around 10.1:1(I think), for street use?

 

higher compression, less boost
lower compression, more boost

stock is 9.2

8.5:1 to 10.0:1 is good, anywhere in there

 

high compression and standalone -= high boost too as well as any compression ratio just dont go lower than 9.0 :1

 

I plan on a max of 1 bar. probaly .5 to .65 every day though.

 

Oh yeah, this will be with hondata.

 

go with 9.5 to 1 81.5 mm bore. you should be okay. if you go with higher bore you will make more torque and pwr at the same boost.

 

The latest trend is high compression/high boost applications. 9.5:1 wouldn't be bad,but I think 10:1 would be that much sweeter.

Rememeber,it's all in the tuning to an extent,if you keep the proper amount of fuel/air in the engine,you could run 18psi on a 12.1:1 compression ratio.

 

I talked to Ben at importparts.com. He said he can get the JE's in CR & bore for a VERY good price! Im probably going to go with the 81.5mm 10:1 I think. Will that be fine with the stock sleeves, that high of compression and 7.5-15 lbs of boost?

 

the higher your compression ratio is, the smaller your window of tuning is. higher compression turbos make more power but usually don't last as long.

 

if your planning to run 15 lbs of boost through a t3/4 w/ 10:1 compression and hondata......good luck.......your gonna need it. just my opinion.

 

quote: Rememeber,it's all in the tuning to an extent,if you keep the proper amount of fuel/air in the engine,you could run 18psi on a 12.1:1 compression ratio.

are you on crack or something?

Yeah we should follow that new trend. Blowing engines are the latest trend those days

 

So would it be safer to go with 9.5:1 Or a little lower?

 

JE pro series 9:1 cr pistons and you can up the boost ~ 18psi daily driven. Of course you maight be able to boost more, but you must retard the timing again and your engine won´t last as long. At 10:1 cr you don´t want to boost more than 10-12psi to be on the SAFE side.

 

Yeah,you are sounding REAL intelligent right now. Yes,I am smoking crack.

What? You tuned your ITR and now you know everything? Riiiight. Or did you even DO your own tuning??

It can be done if you know what you're doing,I've seen it done. So why don't you run back to the ITR forum with the rest of the ego maniacs.

 

And notice I said to an extent.

Would you like to borrow a crane?

 

Physical it is not even near possible to do this, but I´m not going into any discussions about this now.

peace out.

 

That made NO sense.

You are going to try and teach ME physics? lol

This oughtta be good,I'll wait until you have time then.

It's not imposible though,I'll tell you that right now. It may take some very innovative thinking and creative fueling methods or combustants. But it could work just as easily as a 9.5:1 comp motor running 25-30psi. Well,maybe not just as EASILY,but it would work.

Not that I'D ever build anything like that,but you could. Which you said was Physically impossible. When actually Physics dictates that you could boost the motor to hell and back at any given CR with the proper perripheral components.

Just thought I'd save you the trouble.

 

I´m long times on tech board now and I´ve never heard that any car is running a setup like you told. Hense, how long can you boost 18psi on a 12.1:1 cr engine until it blows up? 1 time the 1/4 mile? This sounds more of a turbo Diesel engine (about 19:1 cr with low boost) to me.


What fuel do you need? nitro-methanol or something?

 

yes you might be able to do it .......but would that really be the best thing for daily driven street car......yes we are talking about street cars here. Not everyone has access to a tuner that could make that set up work. So you Might be able to do it but WHY????? running 12:1:1 CR with turbo is just STUPID!!!!!!

 

to the guy who reckons 18 psi on a 12something to 1 CR. Go do and it and I bet you dun even get to finish the 1/4 mile. my friend has tried the safest and probably highest is 10 psi, but if want the motor to last longer, maybe 6 to 8 only

 

Since when did this baord become so extremely closed-minded?

 

why dont you try it and tell us how it turns out

 

hes probably planning on running gasahol gasoline mixed w/ alcohol.. seems to be a trend on the supra side of the world..

anyways for a street honda anywhere from 9.0:1 to 10.0:1 is good.. 10:1 you best make sure you have a great tuner and can afford to rebuild your motor.. might not wanna boost over 11-12psi.. 9.5:1 is a good medium... 9:1 is what im sticking with forever.. I ran my LS motor for 4k miles and 2.5months w/ a fuel pump wired up backwards.. boosting anywhere from 4-11psi.. I was probably leaning out soo much over that time but somehow my motor came through like a champ.. runs perfect.. when u r like me and cant afford to blow a motor stick with 9:1 and sacrifice some power.. youll be happier in the long run

 

If i had the cash and the motivation to do so, I believe i could do it.

The problem I have isn't that it is impractical, or not easily done, it's people saying it can't/shouldnt be done without knowing WHY. Saying something cannot/should not be done simply because nobody else does it (that is EXACTLY what is going on here) helps no one. Share tech info, not poorly developed opinions

 

ok I was just saying I think that would be impractical for a street car set up, I know it could be done but why would you want to on a street car.