Ok, so heres the deal, I just wrecked my 00 audi a6, and looking to salvage something out of this I've been toying with the idea of sticking the turbo's in my civic.
I've got a b20 stock bottom end, mild headwork. It's mostly drive it on the dragstrip for fun.
I want to do this for a few reasons. One, I already have the turbos, two, it'll be more fun to build it myself than buy a kit....and I'm cheap I'm looking for opinions, advice. and has anyone done this before?

 

dont use two turbos, just use one and piece a kit together

 

Those turbos are really small, too small for a single on a 2.0L honda. I say go for it if you have no a/c.

 

i just posted about these turbos, they are really really small, cute as hell. if you can oull it off, go for it, but twin turbo?? has to be some kind of custom manifold that will cost alot. get you insurance money, and go grab a revhard kit. you will probably be alot happier. i just peiced together a kit, and am in the process of putting it on, an know of the **** you run into with this ****. buy a kit, and save yourself the headaches

 

when you piece together a kit you need to plan before you buy....or else you will have headaches...mine went together beautifully.

to the poster....if you have a welder i say do it...it would be alot of fun but if you do not own a welder or have access it would not be cheap as you wish.

 

how exactly did u plan??? i thought i planned great, and just there was little clarance issues i wouldnt know about until it went on the car. mostly its because of my custon 3 inch downpipe

 

Someone did a twin turbo LSVTEC (I think) on HMT a while back.

 

gotta have fitment trials for some of the stuff if you are fabbing things yourself....i went in stages...i actually installed all the electrical parts first and made sure everything worked the way it was meant to...then did a test fit to make the IC piping and downpipe and return line...then last but not least installed everything and went on my way

i think twin turbos would be fun for a daily driver not only designing and fabing but using two tiny turbos that are going to instantly spool to get decent power. dont expect to break any records but i think it would be fun to drive nonetheless

i am a lag **** i felt too lagy with my t3 super 60 sometimes lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by k24em2 &raquo;</TD></TR><TR><TD CLASS="quote">Someone did a twin turbo LSVTEC (I think) on HMT a while back.</TD></TR></TABLE>


Ding ding ding! Jeff Frank aka AbaZ, had an LS/VTEC with twin IHI RHB5's in the 250-300 whp range IIRC. Whitey had a D16 with twin IHIs and nitrous, the details of that one are even foggier.

Pair cyls 1+4 and 2+3, it's the same as a Bucchi manifold aka split turbine. Spools quick, great scavenging, minimal thermal loading of the exhaust side.

 

Pair the turbo's? I was planning on just welding a y pipe to a log mani. Do I lose points for being stupid here, or will that work? Also Whats the theory behind separating the cylinders?

 

Oh, I just thought of another thing, K03's are watercooled, Do i need to pipe that or can I air cool it and run a turbo timer?

 

There's no rationale in doing twin turbo's on an inline 4 engine. You get twice the weight and complexity. More **** to go wrong. Absolutely no gain.

Use one properly sized turbocharger.

 

Well, that I know, But It's part fun, part being unique, and partly because I'm a cheap *** and already have the K03's

 

cheap *** plus custon twin turbo dont match up bro. i mean, if you wanan shell out the money for a custom manifold, 2 downpipes, 2 oil feeds, 2 oil returns, a **** load of ic piping, go for it, more power to you. i think it will be bad ***. but oyu can do it cheap lol

 

A manifold with 4 runners supporting two turbos has to be braced to death. You have to run the line between enough bracing to prevent cracking from weight, and not too much bracing to prevent cracking from thermal expansion. The people who've done twin-turbo hondas did it more for proof-of-concept, as well as being VERY good fabricators.

You also have to gut that section of the engine bay, and more than likely do it to an ek where you can almost fit a small child in that area.

No offense, but you don't seem to have enough working knowledge about turbocharging to do this w/o huge problems IMHO. I'm 90% sure you won't have enough room to pair them on one log manifold, not enough room - unless you make some odd runner off of them. With the way you'd have to work that, it'll be worse than a single turbo - both in spool time & power. When put a turbo on just two runners, you don't get as much reversion, and end up with better scavenging (exhaust sucked from cylinders).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">A manifold with 4 runners supporting two turbos has to be braced to death. </TD></TR></TABLE>

Compared to something actually heavy like a single Holset setup, where the bracing collapses under it's own weight to become a black hole.

HX35 = 4*K03

 

OP- Just ******* do it man.

As far as the watercooling I was thinking of something I could used and I remembered I had a cheap inline fuel pump laying around. I plan on going to autozone/pepboys and getting one of those transmission coolers. I'll make a small resivoir and run lines between the cooler, resivoir, & turbo w/ the pump between the resivoir and turbo to push water through it.

If you have the turbos and you have a welder you're pretty much set. All you need is a head flange, 2 inlet flanges, and your piping.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Joseph Davis &raquo;</TD></TR><TR><TD CLASS="quote">HX35 = 4*K03</TD></TR></TABLE>

Easily. I have them both on my workbench and the Holset could pass the K03 through its compressor without bending a blade.

You don't have to watercool the K03, just leave it off, it's non BB no worries. Just be sure to let it cool down before shutting the car off (just like any other turbo car!).

I was thinking of using twin K03s on a budget build for my Bug, and still might.

 

I agree with you that I probably dont have a good working knowledge of turbos...but thats another reason I want to try building my own setup...to learn. I learned the engine by tearing it apart (with no idea what I was doing) and rebuilding it.
THanks for the advice, I hadn't thought of weight being an issue. Clearance should be ok, the car is gutted of...well...everything.
Thats also a pretty interesting idea for a water cooler, I already have that stuff lying around, I might try it.

 

Eh, run coolant lines from the TB to the turbos. No need for a pump in there, and hooking up coolant lines has a significant effect on turbo life and oil lifespan.

 

Even with small turbos, you'll still experience lag due to the ammount of exhuast flow required to spool them both. In order to have quick spool with twin turbos on a inline 4, the turbo would have to be weed-eater small. which might make a nice powerband for a b18a or something. Good luck with twins on a vtec honda. Those wont pull **** from 6000-8000

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ella94 &raquo;</TD></TR><TR><TD CLASS="quote">the turbo would have to be weed-eater small. </TD></TR></TABLE>

You must have missed the K03 posted above.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ella94 &raquo;</TD></TR><TR><TD CLASS="quote">Even with small turbos, you'll still experience lag due to the ammount of exhuast flow required to spool them both. In order to have quick spool with twin turbos on a inline 4, the turbo would have to be weed-eater small. which might make a nice powerband for a b18a or something. Good luck with twins on a vtec honda. Those wont pull **** from 6000-8000</TD></TR></TABLE>

You just pair the runners. It's the same theory as a split turbine manifold where spool and scavenging is guaranteed.

As PaulVR6 says, K03 are weedeater small... but you could spool twin OEM T3 on a bone stock LS by 2500-3000 with a correctly designed manifold. That's enough combined compressor to support 500-600 whp, with a good powerband. Awkward packaging, though, like everyone says.

 

Ok, this is all making more and more sense....one thing I dont understand though. I'm hearing alot about these turbos being too small for my car so to speak, but it came from a 2.7 that redlines at 7k and they're going into a 2.0 (nonvtec) redlining at...I'm not sure yet, I was thinking 7-8k Am I missing something here?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ella94 &raquo;</TD></TR><TR><TD CLASS="quote"> Good luck with twins on a vtec honda. Those wont pull **** from 6000-8000</TD></TR></TABLE>

When did the op mention having vtec?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Crispy &raquo;</TD></TR><TR><TD CLASS="quote">Ok, this is all making more and more sense....one thing I dont understand though. I'm hearing alot about these turbos being too small for my car so to speak, but it came from a 2.7 that redlines at 7k and they're going into a 2.0 (nonvtec) redlining at...I'm not sure yet, I was thinking 7-8k Am I missing something here?</TD></TR></TABLE>

Generally when manufacturers produce turbo cars, they want to minimalize lag as much as possible, because the average joe/soccer mom who knows nothing about cars don't like random surges of power going to the store (usually). However, some of people who turbo hondas are doing it to make large(r) power numbers, meaning power higher in the rpm range, so they don't care if they don't hit full boost til 5k, as long as it pulls til redline.