91efalex

I'm not sure if anyone has done this or not before, but is it possible? could a d-series hold up to two turbos instead of just one? What would be needed for the setup of a twin turbo build on a d-series?

also:Does anyone know if the boomslang obd0 dpfi - obd1 mpfi harness is any good? I dont want to spend the money on rywire, and i can't seem to find a complete obd0 d series harness to splice in obd1 clips. LMK ideas

p.s.s.-will a y8 valve cover fit a z6 head? or is it a different bolt pattern?

EDIT: Found the post. y8 will fit. but other questions need answers

v4lu3s

why would you do 2 turbos? i can see for a show car, but there is reason why supras and rx7s usually remove the twin turbos and go with a single big one....
as far as what is needed, custom manifold, 2 turbos and then your pipes and lots of time to tune.

JDpower

I've seen a civic with a supercharger and a turbo and that thing was bada$$. But I dont see the point of a twin turbo. Just do a big turbo for power or a small one for quick spooling one or the other.

Projekt_ED3

i would run two turbos but it wouldnt be twin turbo. Go biturbo and it will act like a supercharger but you will spool harder.

tonylovesjdmEF9

i get wat your trying to do which is a squential turbo set up like the fc infinity run a reall small turbo and then a bigger trim turbo so your able to keep the boost up its possible anything is possible with money bro and skill but remember its gonna be a crowed *** bay in a ef lol plus really a single t3/t4 turbo is great for a single cam

91efalex

exactly. i've never seen it done before too, so i think it would be pretty interesting if someone was to do this.

does anyone know if that boomslang harness is any good though?

90_EX_Civic

the only reason for a twin turbo was for the fact that it would take a big turbo forever to spool up. the small one would help for low rpm boost, then help the bigger one spool up.

op if you are willing to go this route, why not just spend the money and get a really good turbo. a lot of the nicer ballbearing turbo's now don't take forever to spool up. you will just still have to size it right though

HOODLOVER

Yea, it's possible.... I would spend that money on quality though..a solid build

~sp33~

I've seen it done before. Didn't make much power.

OneBadTurboCRV

x2

Every now and then a thread comes up like this... it can easily not very easily be done. I am not really going to get into details since clearly you lack basic knowledge... You have a LOT of reading you need to do. A LOT of conversions and calculations to establish a baseline. Your biggest problem won't be fitting two turbos, but rather the intercooler and exhaust piping that will pose a problem. Before I even begin to waste my time with this thread... What is your budget, horsepower goal, and use for the vehicle?

91efalex

Its not that I really lack knowledge about this kind of stuff, I'm just trying to find out if it's been done before. I've google'd, searched, youtube'd and couldnt find a setup like this that wasn't v8 swapped. I did the math already, and if i ran maybe a .60 trim with a t3/t4 with some 550cc/min injectors, that would deff. be enough to push an easy 250hp on a d series with arp's. But the point of the question is if anyone has done it before. It's an interesting concept that I might consider in the future, only because I can't find a soul who's done it before.

Btw, Budget is shot to hell now, TXdmv wants me to pay $1382.50 to register my ef cause prev. owner flaked and never sent me the title, so I just have a bill of sale. So i'll be ripping the motor out, and slapping a mini-me into a 92-95 coupe/hatch hopefully.

TearSDMF89dx

im running a boomslang conversion harness...previous owner installed it 4 years ago and hacked all the wiring in the engine harness but as far as the conversion harness it's been problem free the whole time ...knock on wood

Danielsb20crx

It could be done ive seen a neon green 91 hatch here in palmdale runnin a twin turbo B16 I dont know what turbos they were but lil guys and ran alright

prelude182

ive seen a thread in the appearance section of i think an eibach meet maybe a year or 2 ago and some guy was running a twin turbo setup, not sure what motor but i think it was in an eg or ek. good luck running that kind of setup in ef engine bay. ill look for the picture.

4drEF

Sequential would be interesting. I haven't seen that one on a Honda yet.
However, to make it interesting for me, you'll need to make a 600hp+ engine.
I want to see the dyno curves where that small turbo effectively spools up the big turbo.

claymonthug

looking for a stock dash harness?

91efalex

nah, just the engine harness.

sweet, that's the kind of feedback i'm looking for! anyone else have problem free harnesses?

I would expect a sequential turbo d series to make more than bisimoto's. fully built, almost the same setup as his, but i'd have to find a way to cool this mother down more effectively since the tighter spaces

BigD4207

Actually guys....there's a very easy solution around a twin turbo...and honda makes it! I remember a few years back reading on this turbo they created to work in conjunction with vtec. It's got kinda like a gate inside of it that opens when vtec kicks in, like vtec, making it 2 turbos in one....small passage at low rpm for excellent response and big passage for high rpm ownage....not sure what this was off of, (crv?) but it looked crazy. I've talked to the people at greddy and turbonetics, turbonetics was very insightful, but basically a twin turbo on most 4 cyl hurts performance more than it does good, a cyl simply can't really keep a twin turbo spooled enough, it'll lag like crazy...a sequential would be cool, but damn man good luck even fitting it in, it'll be a nightmare, to get it to work right you'd have to have a very built motor i suspect. I thought for weeks about it with my prelude, but after looking at a few figures, single turbo is the only way that made sense...and JDpower, seen a couple cars super'd and turbo'd, and holy $#!% were they fast, off the line accel was fn crazy, one i seen was an old mr2, centrifigul super and a pretty good size turbo, way bigger than my t3 (set for high rpm boost)

~sp33~

Thanks for the laugh.

91efalex

I really doubt this. crv was n/a non-vtec b20. in newer models, i think they were fitted with low powered k series(correct me if i'm wrong). i found out that a guy built a compound turbo kit at EMS performance down in austin, tx, where two of my buddies now work. he used to work at redline in arlington. i might just have to give him a call and ask him what this compound turbo kit is actually made of and how its built. it might just be the answer.

CPT Del sol

I always liked having a gt35r turbo on single slammers because u still can maintain 25-35mpg if you daily drive it under 3000rpm and spools up pretty quick when needed. But two turbos sequential or not not on a sohc is just useless. The idea of twin turbo civics is always interesting but unless its going in a dohc that can push out enough air to at least make power then its not worth it. Id love to see someone do it but there is a reason kits aren't out there yet. I'm not knocking u op, if u do have any luck please post!!!

BigD4207

yeah when i first saw it was in super street ad page or something...total wtf moment, but i'm 99.9% sure it was a honda turbo, cause i remember thinking damn, they haven't used a turbo in a loooong time lol...but yeah it was a dual gate turbo, friggin awesome peice of technology, don't know what it was supposed to be in, might have even been developed for acura, but i think it said it was developed for an i-vtec honda something...maybe even just jdm at this point, dunno, i'll find the magazine with it though, somewhere in my archive

BigD4207

i don't think it's a sohc vs dohc thing with a twin turbo, it's more of a total displacement vs total intake vol....i was advised by turbonetics not to twin turbo my 96 prelude si...which is 2.3 non vtec and 160 hp all day long...still not efficient for a streetable twin turbo, and would need massive fuel supply upgrades and block sleeves to be able to handle a twin turbo that would run at an effiecient level. Can't have a big twin system without small mpg numbers and can't have small twins cause of massive spool lag, this is what i was told by them, and i specifically asked their engineer to do this with a twin t3/t4.

ochata

Just do this
http://www.d-series.org/forums/showc...d16-build.html

CPT Del sol

Not just twin turbo like other cars, sequential meaning a small turbo spooling a bigger turbo or your **** will run like a v8 pretty much. I'm guessing he wants to turbo or turbo'd a sohc and doesn't want the lag so got interested in this idea but got stuck because he didn't find any info on this build. Like I said I'm not knocking him for his initiative. Turbonetics is up there when t comes to turbo performance but when someone pulls off a twin sequential kit that is just as efficient as a single turbo for our little honda motors I bet they will jump n the band wagon. Quote me, great questions attracts skeptics but when possibility turns into reality, skeptics turns into imitators. Look at our military and all the billions of dollars that go into the production of a new fighter jet that exceeds past standards then china copies our product years later and spends less then 10 percent of what we did. Sucks to be on top but it all started with that "what if?".