Just wanted to know if i can put a small turbo in my car with a 11:5 compression that i got.Or what would be the max that i can shoot of nitrous. I have a Ls/vtec setup with dpr cams,cai, 2.5 exhuast, megan racing header, nology wires. Best time is a 14.2 . I want to get to the high 12s.........any mods that i can buy that would get me to my goal with the all motor setup i have?

 

you COULD conceiveably run boost or nitrous with that compression ratio. first thing to ask yourself is "what is my DYNAMIC compression ratio?" if you have seriously large cams your dynamic c/r may only be mid 10's, which is not so formidable-sounding when it comes to FI. the next thing is "how much time can i afford to spend on a dyno?" you'll need several hours to make it not only smooth, but bulletproof. i've seen it done, but very seldom. finally, "how much power do i really want to make?" on pump gas, with 11.5:1 static c/r, you'll never get to make a whole lot of boost. you may be able to huff out 300whp, which is plenty IMO, and with such a high c/r it will build boost much faster and such, but fact is, if you're a dyno king kinda person or a drag racing fiend, 300whp may not suit you. and by the time you've built this monstrosity, you'll have spent a lot of money, so decide now how much HP you want. if 300whp will satisfy you, then go ahead. if not, don't waste your money trying and instead just go for dished pistons, sleeved semi-decked block, etc. and boost to your heart's desire.

 

i'm currently running 11.5-1 cr on 8.5lbs of boost
i made 255 whp & 204tq on a mustang dyno, that relates to 306whp & 245tq on a dynojet

 

High compression, low knowledge/experience... for 12's on your motor and knowledge, i'd pull the head, get some cams, valves, springs, portwork, a better intake manifold, and a better header, then get some fuel enhancements and a method of tuning.

You can also try changing gear ratios for faster acceleration, are you still using an LS transmission? If so, that's holding you back a lot. . . .

 

nah i got the si tranny

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 9341civic &raquo;</TD></TR><TR><TD CLASS="quote">i'm currently running 11.5-1 cr on 8.5lbs of boost
i made 255 whp & 204tq on a mustang dyno, that relates to 306whp & 245tq on a dynojet </TD></TR></TABLE>

What mods do you have? your #s are badass

 

My buddy is boostin a 62-1 @17psi all day with 11:1 JEs + all on stock sleeves.. All understanding the tune and how to do it safe.
Last week he poped head gasket @22psi. New one is on and boost is at 17psi again.

 

you should be able to pull 200 whp out of a good tune. we have a guy in town that is running ls vtec and has 205 whp, but he has a ported head with cams and some nice boltons. but you deffanatly need to tune your motor. on a stock bottom end you could still spray 75 to 110 hp nitrous, but you need to remember to tune it at a dyno. use a wideband. as long as your a/f doesnt drop you will be alright.

 

ya... i would personally run nitrous... running that high of a compression and boost... erm outcome is not good.
nitrous would definately get you into the high 12's probably...
i have a pretty much fully built LsV and would probably run mid or low 12's if i figure out why my Vtec doesnt work.. and had a 200 shot lol
so yea go with nitrous more bang for your buck

 

Run the nitrous + boost, the nitrous will help cool the mix and run harder and cleaner.

 

how soon we all forget tony the tiger...11.5:1cr and pushes 14psi on a gt28

 

Well im happy that alot of ppl have boosted with that high of a compression. Alot of ppl are telling me not to boost cause the compression of 11:5 is too high. Now i was going to build the bottom end all over again with low compression pistons but now that ive seen you guys boost on that kinda of compression makes me want to bolt on a turbo. You guys made my day

 

glad to make your day . . . although i would seriously look at an LSD and a good dyno tune. you'd make a nice dent in your desire for speed.

 

I was under the impression that you were going to do this all on your own, that's why I suggested sticking with the all motor route.... if you're paying someone else to do it, ****, boost away. I've got around 10.5:1 in a boosted 1.9 liter C1.