High CR LS must have boost! Couple things I'm unsure about though.
 

Hey guys, I have a 93 dx hatch with an ls rebuilt with pr3s (~11.3:1 cr) and I've decided I am going to boost it. It won't be my first turbo honda, so I do have a clue. But I'm trying to think of how to go about my high compression.
I'm looking at running a t3/t04e at only 7-8psi....for the time being.

First of all, the car IS NOT daily driven. It doesn't have to be, I only drive it for fun.

I'm thinking it would be wise to lower the cr at least a little bit, but I'm not changing internals. Advice would be great. As in recommendation for a hg etc? Thanks.

Yes, I know tuning will be everything.

I've heard good things about torco race fuel concentrate. Would you guys recommend I run something like this?

And spark plugs. Do you think 2 steps colder will suffice? Cause I know high cr with boost will create a lot of heat, I'm guessing 3 steps is overkill, but figured I'd ask.

Would a sheet metal im help out? I've heard of them dropping iat's a decent amount.

Any other input or advice is greatly appreciated, really.

But NO, I'm not changing internals/motor, and YES I AM boosting it, so please nobody try to talk me out of it.


Thanks!!

Peter

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

rope... >:(




just turbo it already. :y

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

So one vote for boost it as is! It's an idea, but I might wanna do headstuds anyways, and if I do, i'd need to do a hg anyways. MIGHT.

Other input please?

Thanks.

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

pr3's huh....im putting pr4 pistons in my ls motor along with a pr4 ls head. this is in a b18a1 block. no matter what my cr, im still going to turbo it. anything turbo is better than n/a. just hearing the bov/watsegate with open dump tube go off or the feel of a constant pull is enough to hook me into the turbo game.
headstud the ---- outta it unless you want head lift and warpage. also arp mainstuds and rod bolts would bea good idea since i know you are gonna rev it over stock as i am too. cost some money but all worth it in the end.

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

Go with a thicker headgasket, and the head studs are optional. You are not going to lift a head before the stock rods let go, sorry. And, as long as you are on stock rods, the beam is way weaker than the stock rod bolts. Rev to 8500, unless the bottom end was mis-torqued/assembled the rod bolts will not fail, and at that rpm you're more likely to sling a rocker off due to LS head's design.

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

e85, 105octane so you can drive it daily if you want to, check this out http://www.highaltitudeimports.com/t...bo-tuning.html ls/vtec put down 450whp on stock internals, just something to think about

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

Wow, that's insane!! I had no idea an ls bottom end could sustain that. The torco race fuel concentrate i'm researching brings 93 octane to 107 when you add a 32 oz. bottle to 5 gal of gas. But it actually seems like good stuff, not like "m4D octane booster yo". It's a little pricey, but not toooo bad. Hmm....so much to think about.

Thanks for all the input so far guys.

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

PR4 pistons are stock ls pistons.....and a lot of the stuff you mentioned is good, but not necessary.

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

thicket hg, maybe some meth injection(or w/e injection you want)

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

leave the comp ratio as it sits, and run methanol injection.

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

I'm gonna start researching that right now actually. If anyone has any useful basic-advanced info, or good links, please shoot.

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

OK after reading this I started to laugh. Run it like a normal setup, tune for the gas you will be running and be done with it. 7-8 psi out of the right turbo will not be a problem with our CR. 11.3 isn't anything crazy. It will need one hell of a tune.

Randy
'

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

And that is exactly why I don't feel as if I can run it JUST LIKE any other setup. I know you need to pick a tuner you can trust, but I'm not sure what route I wanna go with there. I figured a slightly lower cr and either some higher octane fuel or a water/meth injection type deal would not only comfort me a little, but also let me push the bounds of what I could do on straight pump gas w/11.3:1 cr. That's all. But thanks for the advice.

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

pfft, 7-8psi is for pussies.

meth inject and make 350hp on it

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

Meth injection is a hassle. Just set up for E85 and be done with it.

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

arent you the guy that always promotes water/meth injection and complains about how there is less stored energy (BTU's) in ethonal fuel? i know it has a higher octane, which makes it ideal for this guys set up but please explain to me JD why you have had such a change of mind?

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

e85 is simple. Water/meth injection is far more complex. For the minor gains you would make with water/meth injection over e85 all of the hassle and extra tuning would make it not worth it. Especially since its probable that you will never get the injection fine tuned correctly. E85 is great cheap race fuel. If you have access to it and you run a quasi performance car, use E85(assuming you don't mind spending more time at the pump).

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

ooh I know all of that, but considering e85 isnt available here, and water is free, and meth is $2 a litre, it's way more beneficial to me

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

Well, e85 sounds nice, but there are no stations within like 15 minutes of my house that have it. And I really don't wanna do a half hour or more of driving everytime I wanna get gas.

Where do you even get methanol? I tried google searching it for places in wisconsin, and it was all medical studies or poison center ----.

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

ahaha princess auto has it here, cause farmers or some fuckers use it for their tractors so their gas lines dont gell up

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

If you are not willing to go a half hour to a gas station. Then lower your compression and run ---- 91. Or buy a 55 gallon of race gas or E85.

Randy

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

We have 93 octane. And that's why I've been researching torco race fuel concentrate. It's sure easier than having a 55 gallon drum of c16.

What kind of shelf life does that stuff even have? I have a feeling it'd be long past due by the time I'd be anywhere near 55 gallons of use.

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

Well, I'm possibly looking at two hgs from cometic. One brings me down to 10.7, one to 10.4. Hmm....manageable. But part of me wants to say ---- it, leave my compression where it's at and run the torco to 107 octane.

And I did a little research, and Eville(some numbers idk after his name) - Randy, used it in his 10.8 rx7 with the 2.3 turbo motor. The stuff sounds pretty legit, and I think it has quite the following with the domestic crowd. Well, at least some kind of following.

But yeah, it'd be great if those questions ^^^ up one post still got touched on too.

Thanks a lot for all the input thus far guys.

Peter

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

Peter,
Give it hell, let us know how it works. I just don't like to see pictures of holes in a dome top piston.

Randy
PS 20 dollars in race gas = saving a motor
when you plan on running it hard

Re: High CR LS must have boost! Couple things I'm unsure about though.
 

Well I think I decided what I'm gonna do. I'm gonna bring the cr to about 10.4:1, and just run 93. And self-tuning enlisting the aid and wisdom of jago. skeet skeet skeet

But when my boost level gets boring, throw in some racegas perhaps.

It should be interesting to see how my car feels, cause i'm using a t3/t04e 57 trim .63 stg3 wheel, so super common on ls motors. We'll see how my bumped up compression performs. Hopefully it'll be even nicer with a gsr tranny. I'll definately keep you guys posted though. Thanks for all the help.

Peter