I am building my lsvtec right now and i wanted to know what i would need to do to run higher compression so i wont be too slow while i am turboless....it will be bored to 84mm and sleeved forged rods and pistons...new everything pretty much...my goal is 500whp after the turbo is done..i plan on using hondata and i have a reliable hondata tuner available and i will eventually learn to tune myself...but i was thinking maybe 10 or 10.5 to one might not be to high to turbo? please let me know what all needs to be done to make this safe...oh yeah its gonna run 93 octane pump gas..unless i need to add octane booster i will (if in fact that stuff works..i have no experience) thanks in adavnce

 

10:1 is a fine compression. Go for it.

 

10:1 and 500 WHP on pump gas? Good luck is all I have to say. Not worth it to go with 10:1 or 10.5:1 and make 10 WHP more from idle-4000, but be down 50 WHP on pump gas because of the higher compression.

 

thus my ignorance is shown ...this is why i seek help...maybe 500 is a little much but hlep me try

 

I would just lower the compression a lil so you can safely run pump gas, but I think 500whp is a lil pushing it on pump though

 

what would your compression have to be for 500 whp on 91 octain? saftey wise?

Im an n/a guy thinking of moving over to the dark side

 

I would think something like 8.8.1, or possibly lower with lots of boost

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FOrSfEd &raquo;</TD></TR><TR><TD CLASS="quote">I would think something like 8.8.1, or possibly lower with lots of boost</TD></TR></TABLE>

Yep. Anywhere in the mid to high 8's and a big turbo like a T3/T67. Henry from full race made 420 WHP from 13 psi from a T3/T67, so I would imagine if you did some headwork, slapped on a JG edelbrock or other good intake, and had a great tune you could bust out 500 WHP.

 

b16a block ctr pistons + turbo t04e hondata tuned will i be safe?

 

Anything under 9:1 C/R is just too low, IMO. Hybrid901 made 414whp on 93 octane and 620whp on race gas with 10:1 C/R.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FOrSfEd &raquo;</TD></TR><TR><TD CLASS="quote">I would think something like 8.8.1, or possibly lower with lots of boost</TD></TR></TABLE>

you kiddin me keep in mind he proly have a street car/race car you don't want to be so boost dependant when the compression is so low

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic2000 &raquo;</TD></TR><TR><TD CLASS="quote">Anything under 9:1 C/R is just too low, IMO. Hybrid901 made 414whp on 93 octane and 620whp on race gas with 10:1 C/R.</TD></TR></TABLE>

agreed anything under 9:1 is just too low

all i got to say i am glad i have 9.8:1 compression on my daily driver it was 10:1 when i had my milled ported itr head..but i blew my motor due to an oil line failin off and scrotched my head cam journals...

plus many ppl nowadays are goin for the mild compression and boost to create a street monster.....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic2000 &raquo;</TD></TR><TR><TD CLASS="quote">Anything under 9:1 C/R is just too low, IMO. Hybrid901 made 414whp on 93 octane and 620whp on race gas with 10:1 C/R.</TD></TR></TABLE>


Have you driven a turbo car running lower than 9:1 then gotten in the same car with with 10:1?

GunMETAL_TEgRa same question for you.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GunMETAL_TEgRa &raquo;</TD></TR><TR><TD CLASS="quote">agreed anything under 9:1 is just too low
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Give me a god damn break. There are literally dozens of people on here running JE "9:1" pistons with a 9.3CC dish, and that actually makes 8.75:1 compression. But no, that motor would be a DOG on the street because you're going to lose 3 horsepower compared to a real 9:1 motor, or maybe an honest 8 compared to a 9.8:1 motor!!!!

Same goes for wisecos, except on a larger scale. I had somebody tell me that anything under 9:1 is going to feel like **** on the street, and yet he had been driving his car around for 6 months with wiseco dished pistons. Guess what the compression on them checks out at? 8.4:1, on a stock GSR motor. A 7:1 GSR motor is going to have more low end than a 10:1 B16A motor, but no siree there is no way you can run less than 9:1 on a GSR motor on the street.

Sure, high compression works alright with a low boost turbo, but don't try and feed people that BS that your car is going to drive like **** with less than 9:1. Yeah, right, when you're driving around part throttle low load to **** around town you need that compression for that extra power to get you through the stop light, right? Or for the second and a half when you make a hard pass that you arn't in boost in first gear, you just GOTTA have that higher compression for more power, right? Even though once you hit boost you would be making more power on pump gas with less compression, and that the higher compression means dick all because as soon as you get into boost you don't drop out of it for a full run.

 

u guys make these decisions even harder lol but i asumed the ideal thing would be high compression with boost but i guess u need the gas to run with it...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dornon13 &raquo;</TD></TR><TR><TD CLASS="quote">u guys make these decisions even harder lol but i asumed the ideal thing would be high compression with boost but i guess u need the gas to run with it...</TD></TR></TABLE>

EXACTLY! If you have a great tuner and don't mind race gas for higher boost, by all means go 10:1 or 10.5:1. If you want a car that you're going to drive on the street, a car that you're going to take on road trips and **** like that where you can't afford to keep race gas in it when you want to get on it, go with lower compression like 9:1 or even less if you don't have the best tuner in town, or if you want a greater safety margin on 91 octane.

 

get lower compression pistons. let the turbo (FI) do the work...not your freaken motor. you won't notice a difference with lag if your motor is built properlly. it'll leave you with more room for error and more room for boost.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shermanyang &raquo;</TD></TR><TR><TD CLASS="quote">get lower compression pistons. let the turbo (FI) do the work...not your freaken motor. you won't notice a difference with lag if your motor is built properlly. it'll leave you with more room for error and more room for boost. </TD></TR></TABLE>

Exactly. I am running an 84MM B18C1 with 8:1 compression custom CP's, and I am driving it around sans turbo right now untill my wastegate gets in and my mani is finished. It feels absolutely fine on the street for driving around, and you can still pass **** fine on the highway. Saying anything less than 9:1 is too low is a joke.

 

i think will go with 9:1 we get 93 octane here so thats a little better the block with be sleeved bored to 84 and forged pistons and rods what other precautions should i consider while the motor is still apart thanks guys you are great....

 

you dont need 500hp on the street.
350 will do you just good.
It just depends on your setup.
Street or Drag?

my setup im running 10.5:1 compression on my setup. Its a Street car and its going to see the track like 3times a year so i dont care about making 500hp which you cant use on the street anyways.
I just want a good ALL AROUND power-band.
THats what you should be looking for.

 

thanks for the info guys, ive got plenty more research to do

 

higher compression will help spool faster. thats what i like on the street. 500 whp is just a # on paper.

besides i made 400 whp on 15 # on pump gas, 11:1. i was hitting boost at 2500 rpm with 60-1 .82 a/r. made over 452 on 19 # and 110.

 

im thinking of going 10.5:1 with a t3 turbo does that sound good to anyone..i am thinking that would provide a rather quick spool....the whole reason i am reluctant about going turbo is because of the lag i have a buddy with a sundance lol yes a sundance on like 20psi lol when u start off ur like nah it aint that fast but then its just like a kick in the butt at whatever rpm he gets spooled...i dont really want that i just wanna take the **** off without waitin lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted92 &raquo;</TD></TR><TR><TD CLASS="quote">

Give me a god damn break. There are literally dozens of people on here running JE "9:1" pistons with a 9.3CC dish, and that actually makes 8.75:1 compression. But no, that motor would be a DOG on the street because you're going to lose 3 horsepower compared to a real 9:1 motor, or maybe an honest 8 compared to a 9.8:1 motor!!!!

</TD></TR></TABLE>

Are you saying that every 1/10 that u raise the compression that's equal to 1hp?

 

I run a 9.5:1 in my 84mm LS VTEC. It feels GREAT around town. Lots of low end torque. I would stay around 9:1 9.5:1 range IMO.

 

are you turboed yet or what? just curious