Need some info on boosting D15B2..
 

Well I have been reading up on this site and many other turbo sites for quite some time, and Im seriously thinking of boosting my D. Now Most of the boosted D15 setups I see use a MPFI swap so they can use larger injectors, is it possible to just use the DPFI? Basically My current car(89' DX Hatch) is just my beater for a little while as i save up money, and I saw that i could do a cheap homeade kit for fairly cheap. Ihve heard some people on here have boosted B2's that still use dpfi, so i thought id ask around. I tried a search, but the search results are kina cluttered..

also, Like i said, im very new to turbos in general. Never installed one, but im pretty mechanically inclined. Just need to know what I need, and some basic instructons. I realized I need the turbo, which i read the 14b (TD05h) is a decent turbo. and obviously a manifold, and downpipe/flange. some type of oil/water lines, and this whole engine management thing has a me a lil confused. What would I need exactly? just a simple vafc/safc? or is there more to it then that? I appreciate the help guys.

Re:Need some info on boosting D15B2..
 

get the mpfi, it will be easier to tune and better over all, not to mention it will add 20-30hp right away.

look into a rhb5 or a t-25 turbo. 14b will be a little big for the 1.5l but it'd do just fine if you find a good deal on it, not to mention it is abitch running charge pipes out of. either rhb5/t-25 / t-3 (.42/.48) those 3 are easy to run charge pipes and that type of ---- out of.

do yourself a favor like above and do the mpfi swap. well wroth it.

as far as mangemnt

you can chipp your ecu (get a stock 90-91 si ecu) and chip it with turboedit, you'll want the bigger 450cc injectors and that is the best way

or

you can get the 450cc injectors and control them with the afc hack

or

you can get a fmu unit and use stock injectors (yuck)

you can put together a turbokit extremely cheap if you want.

but im going to stress again, do the mpfi swap. it will help you tons.

(im currently getting a z6 head for my dx 4 door (d15b2 motor) and im putting the z6 w/ mpfi + vtec + going to be running probably a t3 .42/.48 on it.

where are you located? do you have emissions testing? if not, plan on removing your cat and making your exhuast a bit bigger (atleast 2.25")

other than that you're prett ymuch set

nathan

Re:Need some info on boosting D15B2..
 

just a quicky recap of parts needed

turbo
manifold
downpipe
charge pipes
oil/water lines + fittings
bov
couplers
some vac lines + t fittings
injectors + either fmu/ecu/afc management system

boost guage , oil pressure gauge, fuel pressure gauge


you should have no problem reaching 150whp on the little 1.5l

nathan

Re:Need some info on boosting D15B2..
 

Honestly my self, i have FMU's but if you dont want to switch to mpfi and want to save money, go with an fmu and 8lbs of boost, i have seen it done and have seen great results, and if you want to run more boost, run a walbro 255 lph fuel pump, if you have any more questions pm me.

Re:Need some info on boosting D15B2..
 

spend the extra 300 bucks and get an intercooler
learn from me on this one....use you money this way and use the FMU for now...the colder air will help at lower boost levels and youre not ramming hot ass air in there on that aged motor (save you head gasket ahead of time)...FMUs arent all that bad for a beginner with 8psi...worked fine for me for over 2 years
jman

Re:Need some info on boosting D15B2..
 

im installing turbo on my d15b2 right now.. you can get mpfi parts for around $150.. its WELL worth the upgrade.. not to mention the tunability, etc. i would not bother with dpfi. the throttle body is tiny along with the mani..

Re:Need some info on boosting D15B2..
 

thanks for the responses guys. Heres the deal. I currently have 2.5" full piping with no cat or resonator. so im good on exhaust. I would love to switch to mpfi, but I plan on selling the car withing the next 4-7 months and thats not something id wanna take back off to sell. I plan on moving the turbo setup to my next car, hopefully a 92-52 hatch with a D16.

about the turbo again now. An intercooler sounds good, Ive been looking at them on ebay, can get some for under $150. Is it worth it to get a side mount one, one of the smaller ones that are maybe used? not that i dont have the money, but this is supposed to be a budget setup. 8lbs of boost is plenty! I wasnt going to be happy with just 5 or 6. Just enough to give my car some extra oomph.

Now what was this about keeping the dpfi and using an FMU? Ive heard all these terms before but not fully knowledgeable on all of them, understand im pretty new to all of this. I appreciate the help guys. Im gonna see if i cant start piecing some parts together.

Re:Need some info on boosting D15B2..
 

oops realized a mistake in my last post, I meant i WAS going to be happy with 5-6 pounds..lol

Re:Need some info on boosting D15B2..
 

how does this look for a turbo?

http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW

seems like a decent deal :)

Re:Need some info on boosting D15B2..
 

yeah that's a good deal but it will prolly end at $80-$140.

you for sure should get an intercooler. check some local junkyards for 1g eclipses and you can get there sidemount and make it fit.

if you put a z6 head on this, you could just swap it to your new d16...

just fyi

nathan

Re:Need some info on boosting D15B2..
 

like i was saying. Im going extremely budget style. An intercooler will get done. But im keeping it dual point. and my last question was, what exactly is an FMU?

Re:Need some info on boosting D15B2..
 

ok guys, just did some reasearch on fmu's. I got it all figured out now. Ill probably be going this route. Now my question is this. What type of FMU should i get. from teh reading i did, it seems thata certain fmu is made to work at a certain 'set' a/f ratio. Whats a good a/f ratio for my setup? (d15 with a TD05h/T-25/RHB5) and im sure its better to be too rich then lean....

Re:Need some info on boosting D15B2..
 

well...not really. a fmu just bumps the fuel pressure up. lets say, a 12:1 fmu bumps the fuel pressure 12 psi for every pound of boost. this is why no one likes them because at, for instance, 8 lbs. of boost, you have 96 psi of fuel pressure plus the stock fuel pressure. :-X

Re:Need some info on boosting D15B2..
 

:o so basically I should keep it at low boost(5psi or so) and get one thats like 8:1 or so? Would that be better?

Im really learning alot guys, thanks!

Re:Need some info on boosting D15B2..
 

i dunno about the different ratio fmus, but i think every1 on here that runs a fmu is either running 12:1 or 10:1. yeah just keep the boost down and you'll b fine

Re:Need some info on boosting D15B2..
 

well 10:1 at 5 lbs would be 50psi on top of what its already sending...is that even that high? what would be too excessive?

also ona side note, ive been looking at BOV's. I think ill just get the 1G eclipse one. or do i need a manual boost controller to do this? Or if i have a manual boost controller alone, I dont need a BOV? I kinda want one anyways, just wondering.

Re:Need some info on boosting D15B2..
 

i used a FMU on my 187k mile d15b2 with DPFI for a few months. 6 psi most days and when i felt a little nuts i would turn it up around 12. held up pretty good. it finally let lose on a 9psi 3rd gear pull

Re:Need some info on boosting D15B2..
 

that'd be 50psi+whatever it runs with no boost so you'd be at like 100psi


what kind of power were you putting down iwth this?

I got a civic that im going to probably end up putting the mpfi onto...but who knows

if the fmu would work i might as well rape the ---- out of it and have some fun.
but i think the mpfi /a6/or z6 swap would be better overall it'd give lots of power...but who knwos

nathan

Re:Need some info on boosting D15B2..
 

nah man i totally know what you mean. If i was going to do this the real way id go mpfi for sure. Its just that Im selling this car soon. and I dont even wat to be spending as much as I am on this. Im trying to save up for my 5th gen civic. I will not cheap out on that car. I just want the cheapest way to boost this thing and have it be fairly reliable. its not like im gonna see redline at every stoplight. Just for occasional use. I think this setup should be ok..

Re:Need some info on boosting D15B2..
 

yeah

that sounds good

you're starting to make me question if i want to just say ---- it to the mpfi converstion im going to do on my civic and just boost it a little bit w/ a fmu unit becuase i can get one for like $50. I already have most of the ---- that is neede for the converstion and all of that but who knows. If i really wanna do it right I'll just pull that motor and put a d16z6 and boost the piss out of it...which is prolly what i'll do

nathan

Re:Need some info on boosting D15B2..
 

do mpfi, its not hard. dpfi is a waste of time, i dont think boosting it with a fmu would work well since it only has 2 injectors

Re:Need some info on boosting D15B2..
 

ssl2k - im not sure what kind of power i was making. it was non-intercooled also. here are some pics-

http://www.newbieforces.com/files/civic 010.jpg http://www.newbieforces.com/files/civic 011.jpg
http://www.newbieforces.com/files/civic 004.jpg http://www.newbieforces.com/files/civic 005.jpg
http://www.newbieforces.com/files/civic 006.jpg http://www.newbieforces.com/files/civic 007.jpg
http://www.newbieforces.com/files/civic 009.jpg

it was pretty quick at 12 psi. that was probably like 150-160whp. it was really fun to ---- with people in a rusty old civic. it had a quiet exhaust for a while also which added to the sleeper effect ;D i say boost the DPFI

Re:Need some info on boosting D15B2..
 

lol

that setup is like $250 invested total.

I like it. Once I get that civic to my house and tear it down I'll beable to find out what exactly it needs and ----..

nathan

Re:Need some info on boosting D15B2..
 

bovs and mbc dont have anything in common. a blow off valve opens up when the throttle is closed so that the pressure can get out of the pipes. if you dont have a blow off valve, the pressure backs up into the turbo and screws ur turbo up, its called compressor surge.

a manual boost controller goes inline on your vacuum hose from the wastegate to the compressor housing and ups the boost. hope that helps.

Re:Need some info on boosting D15B2..
 

bovs and mbc dont have anything in common. a blow off valve opens up when the throttle is closed so that the pressure can get out of the pipes. if you dont have a blow off valve, the pressure backs up into the turbo and screws ur turbo up, its called compressor surge.

a manual boost controller goes inline on your vacuum hose from the wastegate to the compressor housing and ups the boost. hope that helps.
yea that helps alot. again, im learning more as i go along, so this is great.

So a BOV will mount right on the intake tube that is coming from the turbo/going to the intake? and if i didnt have a manual boost controller, what psi would be default? Ive seen them on ebay fairly cheap anyways.

Re:Need some info on boosting D15B2..
 

you wont need a mbc unless you want to crank up the boost.

what is "stock" psi is whatever the wastegate is set at. anywhere from like 5.5 to 8psi is normal

nathan

Re:Need some info on boosting D15B2..
 

yeah the bov will mount on the charge piping. the stock psi the wastegate is set at depends on what kind of turbo u have.

Re:Need some info on boosting D15B2..
 

alright. well its just that I cant really be going over 8psi..prolly around 6 is a much safer number. and if i need to lower teh boost how can i do it? Ive read that MBC's are only really good for raising boost, so how would i lower boost?

Re:Need some info on boosting D15B2..
 

https://www.homemadeturbo.com/forum/...;threadid=2952

you could use the carb spring method ^^, or you could lengthen the actuator arm, or just buy a new wastegate with a lower psi setting. im out for tonite ill check back in the morning