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Discussion Starter · #1 ·
Need your advice guys!

Can a JDM D15b be twin turboed? Bcoz i have 2 turbos from Toyota starlet GT Turbo 1.3 lying around and i was wondering if a could use it.

I was also wondering if replacing my stock injectors into injectors from a D16 would make any difference? or h22 injectors would be better?

also, can a 2inch exhaust be enough for a boost of around 8-10 psi only?

any help would be appreciated guys! thanks!
:D
 

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I would suggest keeping it single turbo because if you twin turbo a 1.5l 4 cyl. neither turbo will flow anywhere near their efficiency, not to mention the power impulses will be horrible and will cause extreme lag...
 

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short answers...

yes a D15b can be twin turboed... no it isnt worth it I believe...

replacing injectors to a D16 wont do anything since all D series (except for the Vtec E and lower model, and the D16y7) use 240cc injectors, even the B series use 240cc injectors... so not worth it again...

sure a 2 inch exhaust will support a twin turbo motor, but you are choking it out soo much again, it would be better to run 2 open down pipes on it then to run a 2 inch exhaust, if u were going to route to one exhaust u need to get something that matches exiting CFM from both turbos... GL man
 

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Single turbo should be enough, to much of a hassle to twin turbo it and not worth it unless you wanna be like some of the cars on HMT. Some of those cars are fucking sick :TU:
 

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Depends on the type of twin turbo setup you have in mind.

Unless you are planning on a sequential setup or a parallel setup(with some sort of boost control) you CANNOT use two turbos of the same size.
 

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Discussion Starter · #6 ·
Thanks guys..

So i think i'd better stick to a single turbo.

If this is the case, my stock injectors (240cc) would suffice ryt? will a 2inch exhaust be enough?

Can the turbo of an Toyota MR2 work for me?

Oh and one last thing... what's the code for the turbo of a Starlet GT turbo?

(Pardon my enthusiasm on toyota turbos... its just bcoz there are a lot of them lying around here)

Thanks guys!
 

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yes single turbo will b great.. u can use 2 turbos of the same size with custom manifolds, a turbo for every 2 cylinders... no i would go up to some 44cc injectors at the least.. something between 440 and 750cc nothing bigger or smaller... 2 inch will not work for u the way u want homie... 2.75 inch atleast for me mang.
 

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Thanks guys..

So i think i'd better stick to a single turbo.

If this is the case, my stock injectors (240cc) would suffice ryt? will a 2inch exhaust be enough?

Can the turbo of an Toyota MR2 work for me?

Oh and one last thing... what's the code for the turbo of a Starlet GT turbo?

(Pardon my enthusiasm on toyota turbos... its just bcoz there are a lot of them lying around here)

Thanks guys!
Starlet GT Turbos and Starlet Glanza V's (which share the same engine:4EFTE) normally use CT9 toyota turbos. Apparently there are two versions of CT9 though, which differ in turbine impeller shape and size. And I came across a couple of JDM 4EFTE's which had a CT12 in what looked like a factory stock installation. Rule is the CT9. Some late model 4EFTE's had the Aisin micro-turbo, which basically is considered to be an unmarked CT9.

Toyota MR2's used the ceramic, divided housing, more efficient version of the CT26. I am on a project to install a CT26 from a Supra (the less desirable CT26) on my Vtec-E. For a low boost, no-expectations project, I think it's a good turbo.

Toyota turbo's are cheap and reliable big time! Unless of course you boost them up!;)
 

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Discussion Starter · #9 ·
sorry for the stooopid/ignorant questions.. what kind of car carries a 440cc injector?

i'm asking all of these questions coz a tuner shop offered me a complete turbo set-up for 400dollars using all that they can get from a Starlet GT Turbo which they are upgrading as of the moment.

keep the advices coming guys. i wanna be as informed as possible before starting my build. thanks!
 

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sorry for the stooopid/ignorant questions.. what kind of car carries a 440cc injector?

i'm asking all of these questions coz a tuner shop offered me a complete turbo set-up for 400dollars using all that they can get from a Starlet GT Turbo which they are upgrading as of the moment.

keep the advices coming guys. i wanna be as informed as possible before starting my build. thanks!
Starlet GT turbos don't use 440's!!!!

They use Denso 300 somethings and are high resistance.

The biggest low resistance, top feed injectors you can find on toyota engines are 430's off 7MGTE's. Which go really cheap.

This table I found ages ago on an Aussie auto site could be helpful:
http://autospeed.drive.com.au/cms/A_0102/article.html
 

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Discussion Starter · #11 ·
Starlet GT turbos don't use 440's!!!!

They use Denso 300 somethings and are high resistance.

The biggest low resistance, top feed injectors you can find on toyota engines are 430's off 7MGTE's. Which go really cheap.

This table I found ages ago on an Aussie auto site could be helpful:
http://autospeed.drive.com.au/cms/A_0102/article.html
that's why i'm asking where can i find 440's man.. i know starlets don't have them.. i have an eg4door.. thanks!
 

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Depends on the type of twin turbo setup you have in mind.

Unless you are planning on a sequential setup or a parallel setup(with some sort of boost control) you CANNOT use two turbos of the same size.
what? that didnt make much sense...

there are only 2 different types of twin turbo setups, sequential and parallell

generally parallell uses the same size turbos because you are splitting the exhaust between the 2
 

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what? that didnt make much sense...

there are only 2 different types of twin turbo setups, sequential and parallell

generally parallell uses the same size turbos because you are splitting the exhaust between the 2

How you define a sequential set-up?

and

How you define a parallel set-up?
 

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How you define a sequential set-up?

and

How you define a parallel set-up?
exactly like the definition if each word

parallell, 2 turbos the same size where the exhaust mani splits and enters each one equally. compressor outlets merge together into one charge pipe.

sequential, 2 turbos of different size, smaller one helps spool the larger one. exhaust enters the smaller turbo, the DP then enters the bigger turbo's turbine inlet, then exits into the exhaust. compressor outlet of smaller turbo feeds into the compressor inlet of larger turbo, then the larger compressor outlet goes to the charge piping.

small pic, but decent example


could also be referred to as "Compound Turbocharging", but ive always known it as sequential
http://en.wikipedia.org/wiki/Twin-turbo
 

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exactly like the definition if each word

parallell, 2 turbos the same size where the exhaust mani splits and enters each one equally. compressor outlets merge together into one charge pipe.

sequential, 2 turbos of different size, smaller one helps spool the larger one. exhaust enters the smaller turbo, the DP then enters the bigger turbo's turbine inlet, then exits into the exhaust. compressor outlet of smaller turbo feeds into the compressor inlet of larger turbo, then the larger compressor outlet goes to the charge piping.

small pic, but decent example


could also be referred to as "Compound Turbocharging", but ive always known it as sequential
http://en.wikipedia.org/wiki/Twin-turbo

We are on the same wavelength.

We agree on the definition of parallel but not on sequential. But we're almost there.

Parallel is as you said. 2 turbos same size both spool together, cylinders are shared, 1 exhasut mani/turbo, boost charge carriers normally joined before IC via a Y-pipe. Biggest fuck up with this set-up on in-line engines is boost pulsing.

What you referred to as sequential and wiki calls it compound, we call it in-series over here. 2 turbos different in size, 1 exhaust manifold, exhaust enters manifold > turbine smaller turbo > turbine larger turbo > OUT. Boost built by smaller turbo enters bigger turbo compressor than is recompressed into the engine.

Sequential is 2 turbos same size, common manifold, they spool at different engine speeds as in the RX7.

this is a nice photo of a compound set-up, I found it in a gallery posted on this board.

 
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