John's Dual Carbed NA Project - Rim Sponsorship Confirmed

[JohN256]

hey guys, since im getting a replacement engine in my honda and a full overhaul to the engine i have decided that in around 4-5 months time i want to turbo my car.

I have allready removed the aircon system because i never used it!

I have allready been talking to a guy on trademe that makes custom plenums and he will be sponsoring me a dual carb custom plenum for the turbo conversion. I will have to stick his logo on my car which isint a biggie since ill get it for free.

Ok from what ive read these are the things i will need:

teo4 turbo + manifold
electric fuelpump (please confirm)
re-jetting the carbs (please confirm)
fuel pressure regulator (please confirm)
intercooler

also i have read that it wont be possible to put a blow off valve on this setup (blow throught) is this correct? can i run a wastegate? i want to be able to run about 6-8psi max on stock internals.

i know this isint going to be easy, but once complete it will be at least a one of a kind setup in nz!

Please give me some tips and suggestions on what other parts i need etc...

Cheers JohN

[Bananaman]

Yes you will need to re-jet the carbs to allow for more fuel. And in theory you should be able to run a blow off valve as all it does is release pressure in the intake pipe from the intercooler when the butterflies shut off throttle.

You still have a butterfly setup with the carbs and still will be creating boost off throttle.

[JohN256]

sweet, because not having a blow off valve would suck lol, ok so i can add a blow off valve to the list, i already have a spear oil pan and i will sort out oil return on that, and when i do the actual conversion i will just unbolt old one and bolt on new one! i have already done a XSI front disk and caliper conversion also, now with re-jetting carbs, i will have a spare intake manifold also from old engine, with re-jetting carbs, what is the best place to do this at? in Auckland? and by re-jetting carbs, whats actually involved in this process, i dont have a clue i need to do more research in that area!

[chris_P]

they just put another jet in each carb?

[d16a7]

i dont think anyone here in NZ has turbocharged a carbied honda before... maybe have to check honda tech.. but for the sake of your own sanity do not post a thread.. Search Search.. and then if you still cant find anything possibly post a thread...

[JohN256]

i have posted a thread because as you can see (stage 1) is only the talking part, later on this thread will be my build thread etc etc.

Now my budget for this will be around $1000 to $1500, i would like to do everything as cheap as i can!

Regarding fuel pressure reg and fuel pump, what would you guys reccommend?

Cheers

[Bananaman]

That is a question you should be asking a specialist or at least someone who has done it before. Because jets purely flow thru and getting a high volume pump and a FPR and setting them wrong will result in major over fueling. Not something anyone on here would be will to put there neck out for.

[EVLTEK FBI AKL]

your budget is not big enough to use quality parts ie reliable, not blowing up parts.

T04E turbo is too big - run something smaller like a T25 or T28....

you'll need a exhaust manifold
wastegate
fuel pump
regulator
intercooler
piping
oil feed and return to turbo
spark plugs etc

please take longer to do it and do it right the first time.

[chris_P]

yea bro 1500 is waaaaaay to little. I was thinking of turboing my starlet, and still am. I priced everything up was going to cost around 6k mark, and thats going to be a HELL of a lot simpler than ure car. But when i sat down and thought about it 6k is quite resonable seen as im going to get a pretty freakin quick car for under half the price of late model evo's/subies =D.

A manifold would probly set u back 3-400 alone, then at least another 400 for exhaust. Then turbo, oil lines, tuning, sump modification, cert, intercooler.

oh yea and did u mean td04 or To4e?

[JohN256]

thanks, thats why ive posted now so i will exacly know what parts to get and i can start collecting now!

I am instested in this manifold:
http://cgi.ebay.com/ebaymotors/1992-...spagenameZWDVW

it looks pretty decent, has bracing and i think this is the manifold that would fit the t25 turbo ae?

I also forgot that i will need to get a half size radiator also to give the turbo setup some room, i know people that can do cheap welding jobs for me but im also looking to get some minor sponsorship as this will be the only dual-carbed turboed honda integra in nz!

Is there any other small turbos that i can use?

[chris_P]

you could use a t25, t28 maybe?, td04. basically what ive found when figuring out the package im going to buy is, take ure budget - double it, take the amount of time its going to take and double it haha

And i think that mani will have to be modded as the d16/15 exhaust ports arent the same? correct me if im wrong

[Ped Rac3r]

I'm not sure if the Keihin Dual carbs can even handle boost, so that would be your first problem to look into. You would be better off doing a PGMFI conversion and turbo it from there.

But if you really want to turbo it with the carbs, go to www.d-series.org. You'll find everything you need on there.

[2sifty]

some carbs dont like being pressurised. if u go blow through carb setup u can run a blow off valve, suck through setup dont run a blow off valve or u will be spraying fuel evertime the blow off valve opens.think of jets as the fuel injectors(yes i know very rough comparisson) if u run 8 psi boost u will need an electric carb fuel pump capable of 8psi plus how ever much fuel the motor requires(because the carb pressurised to 8psi with boost u have to match that with fuel pressure before fuel will flow into the carb.i dont imagine finding bigger jets for the factory honda carbs will be cheap or easy to come by.bin the factory carbs and suck up to the guy making u custom plehum and get him to make u a custom intake manifold and slap a pair of side draft dellortoes on it(then u got quads !) dellortoes dont mind boost but from memory side draft webbers dont.jets for these carbs easy to come by.also if u run a suck through carb like a su u cant run a intercooler as their is a risk petrol will pool in the bottom of the intercooler, get a back fire through the intake and boom goes th intercooler ! another option is go see your local v8 specialist and talk to them about suitable holley carbs (if u luck a good second hand one) or a weber 32/36. jets are cheap and plentiful and more likely to find someone who can help set it up. id use either a factory rx7 series 1 fuel pump or maybe a holley red/blue arse if i can remember which would be better

[JohN256]

ive made a post on d-series.org

here is the link:
http://www.d-series.org/forums//showthread.php?t=77401

you guys are more than welcome to follow it if you want.

Cheers johN

[turbozxi]

It will run like shit, seriously dump the car and get a Fuel Injected version. Did you manage to find a engine? For the price of the swapping out your old engine you could buy another fuel injected car. Trying to be different and cheap never work.

[JohN256]

haha, and you know this how? see the thing is, on the net i have not found a single dual carbed honda! not even one, by the looks of things i will firstly invest in some carbs, something like a deltro quad carb setup with custom manifold, once ive invested alot of money into carbs i can go from there and save up more and do a high quality decent turbo setup.

Cheers JohN

[turbozxi]

Originally Posted by JohN256

haha, and you know this how? see the thing is, on the net i have not found a single dual carbed honda! not even one, by the looks of things i will firstly invest in some carbs, something like a deltro quad carb setup with custom manifold, once ive invested alot of money into carbs i can go from there and save up more and do a high quality decent turbo setup.

Cheers JohN

I know what i said from experience years of it, albiet not with carbs.... You will find its right.
Did you find another engine? I actually tried to help get one for Kevin there hard to find.

[VTAKYO]

The car will run like shit. The honda dual-carbs are a bitch to tune, not even Christchurch's top carby specialist would touch them on my old EG4. Honda wouldn't touch them either. I have never got it to run right, only with intake, exhaust, and headers. With a turbo it will be a completely different story aye... :thumbsdown:. But, nothing is stopping you trying, you just may end up with another dead engine and a garage full of turbo parts. In the end I saw the light and got myself an SiR.

[JohN256]

yeah man, was going to get a single carbed twin cam zc, but power wise ther bout the same, kevin found one in the waikato and its going to be here tommrow morning! just picked up my lightened flywheel today, the guy that did it for me took off 2.5kg's so im very happy with it! as with the honda dual carbs you guys are right they are crap, i will invest some money in a proper quad carb setup that will be able to handle boost, that way those carbs are easy to tune etc etc... so first i will get quad carb setup and get that running mint then save up more money and get a turbo setup what u guys think?

[d16a7]

just leave it as quad carbed and tuned to hell should go alright..

[Coupe-R]

This will be crack up, do it!

[MarkE]

Originally Posted by JohN256

haha, and you know this how? see the thing is, on the net i have not found a single dual carbed honda! not even one

Theres probably a reason for this.. :wink:

[phonix]

Originally Posted by MarkE

Theres probably a reason for this.. :wink:

:idea:

Are you using standard internals? How much power are the rods in these able to handle?

You will be able to find a bit of carb turbo info on www.oldschool.co.nz

No Honda's though.

[doo0T!doo0T!]

If i were in your boots I'd be ditching the honda carbs and putting a plenum off a fuel injected engine on it. Weld over the injector holes and use it as-is with no TB.

Run a big single carb pre turbo and do a draw through.
Like a 2" SU off a rover 3500 or somthing.

That would be a only way i can see this being sucessful on a budget that small without having a workshop and skill sat your disposal.

With a draw through you dont need a higher pressure fuel pump, the pump you have is low pressure high volume and will be more than adequate to keep a fuel-pot full on an SU.
SU's and a lot of carbs dont like being pressurised as they leak all over the place.

There are heaps of different jets available for SU's and you can make your own by hand sanding the needles.

It's not rangi it's how most early japanese and italian carbie-turbo setups were like. Like mitsi cordias and shit. You wont be able to run a blowoff valve in the conventional sense but I'm sure with the use of an old external waste gate you could dump the air/fuel mix into your exhaust. Hello off throttle flames.

And what wasthe problem with that flywheel? What was actually made it not fit?

[Ped Rac3r]

Originally Posted by JohN256

haha, and you know this how? see the thing is, on the net i have not found a single dual carbed honda! not even one

Go onto the d-series forum, there's a 60 page thread on just carbs. It will probably convince you to go for a hardcore carb N/A project lol. Check it out, its a good read.