bi-turbo or single turbo ?

[2wickedtoyz]

i have started welding my pipes for a turbo using my spare engine. but the thing is i want the power at a lower rpm i don't want max hp i want usable power to get my car off the line with little effort. i just finished building a custom turbo manifold on a saturn and it starts spooling at 2000rpms i was thinking about having mine do the same. i will be using either 2x t3 or a ct26 but i'm not sure. i also want to know how much boost can i give it without having to change injectors fuel pump ecu and all that other stuff. i was thinking about 6-8psi is what i want. i remember the trd s/c is 4psi stock so i figure a little higher will be good?!?!
i feel confident enough to do it and my compression on my motor is great.

i really need your help guys cause i don't want uncontrolable power but i want to have it on as i accellerate. cause this wagon needs the extra help.

side note: after i finished header wrapping the turbo manifold on the saturn we took it for a quick "run" and from a 40mph rolling start on i-95 it's like i wasn't even on the gas and he was gone his car is not yet tuned and is running very rich as well as the fact he as a 1 1/2 inch catback that is stock. so yeah i need the power

[zoni]

you'll want a safc in either case. you will need to tune the air/fuel no matter what.

with those 2 options ( 2x t3 or 1x ct26) i'd say twin turbo. according to what tony the tiger experienced, he didnt think the ct26 was big enough for his 1mz. AND he had a 57 trim upgraded ct26.

if i were you, wanting low end power and fast spool... i'd run the front exhaust piping through a small turbo that will spool up fast with the 3 front cylinders, and then mate that downpipe with the pipe from the rear bank, and take them both to a larger turbo that will fill out the top end. it will be tough, but it would prolly work better than two small turbos. look for a turbo that works well with 1.5 liters. use that for the small one, then use something like a bigger t3/t4 hybrid for the bigger one...

OR you could think about twin charging... supercharger + turbocharger.
check out this page http://www.geocities.com/motorcity/lane/1231/ it has a lot of good links on twin charging and it will help you to get a good grip on what you might need to do with twin turbo as well... a lot of good info here.

the oil lines and all the vac/boost lines have to be perfect though. keep that in mind in doing whatever you are going to do.

[2wickedtoyz]

bi-turbo not twin turbo. i don't need high end power i need low end i don't want to add any aftermarket controllers i would add bigger oe injectors from a supra aswell as the fuel pump. oil cooler i have to run oil lines and i have the pan tapped for a return. i want my car to be "stock"

as for the trd s/c when you buy it it doesn't come with those upgrades.

[zoni]

Originally Posted by UfoZ

Then again, what do I know...?

not much about a v6...
here is what you dont know...

I believe a twin turbo will run fine on stock internals (with reasonable boost). there is no reason to believe that it would blow a motor if run safely.
The piping combined with the proper sizing of the turbo by comparing compressor and turbine maps.

Tuning doesnt really affect when the turbo will spool. it will spool whenever it has enough exhaust flow to spool the turbine.

why would his car run like shit on a stock fuel system? and stock internals? i mean... obviously he will have to up the injectors but thats about it to run safe boost. and all he wants is safe boost.

you dont always need a boost controller to regulate boost, most internal wastegates are properly sized for the turbo that they are on. its good to have at least a MBC so you dont get spikes, but thats it.


now maybe you know some of this....

yeah the 6psi pulley guys all run safc and injectors.

you cant do a turbo without some way of controlling the air fuel ratio... changing the injectors isnt enough... the stock ECU is not fully capable of keeping up with the extra flow and determining fuel output for the air flow.


im curious to what you mean by bi-turbo...
its either a true twin turbo, where the turbos run completely seperately, or sequential twin turbo. there is no bi-turbo.

[zoni]

also, read this stuff... its about supras sequential turbo setup...
http://www.mkiv.com/manual/manualtt/...ion/index.html

[zoni]

how did you get the turbo to spool faster with just tuning the fuel?

A Mickey-mouse'd ghetto turbo system will never compare to a well thought out, well tuned turbo system with all the right parts.

thats why my car isnt done yet... i have all NEW parts and nothing shitty... all good expensive shit. i wish i could have the money for it to be done now, but i do want it done right.

[chronoti]

Originally Posted by zoni

you'll want a safc in either case. you will need to tune the air/fuel no matter what.

with those 2 options ( 2x t3 or 1x ct26) i'd say twin turbo. according to what tony the tiger experienced, he didnt think the ct26 was big enough for his 1mz. AND he had a 57 trim upgraded ct26.

if i were you, wanting low end power and fast spool... i'd run the front exhaust piping through a small turbo that will spool up fast with the 3 front cylinders, and then mate that downpipe with the pipe from the rear bank, and take them both to a larger turbo that will fill out the top end. it will be tough, but it would prolly work better than two small turbos. look for a turbo that works well with 1.5 liters. use that for the small one, then use something like a bigger t3/t4 hybrid for the bigger one...

OR you could think about twin charging... supercharger + turbocharger.
check out this page http://www.geocities.com/motorcity/lane/1231/ it has a lot of good links on twin charging and it will help you to get a good grip on what you might need to do with twin turbo as well... a lot of good info here.

the oil lines and all the vac/boost lines have to be perfect though. keep that in mind in doing whatever you are going to do.

in your idea of the small turbo off the front wount that cause the front to have a higher back pressure lowering the front performace? it would be like a VERY poorly desinged y-pipe wouldnt it? i'm not all down with the turbo this is why i ask before i bash.

that link is down.

and from what i got from the supra set up was the 1st turbo is connected to all 6 and and the exhaust from that and the waste gate runs in to the 2nd turbo. and back flow on the charger is controlled by a valve ...... or i'm stupid and i complealy misread the thing and if i saw it in person i would get it in a second.

[94CoupeV6]

Duuude, build your engine for bottom end power and have a single turbo for the top end! If you dont want massive amount of top end and more mid-range just do a custom TRD supercharger setup, thats what I am planning on doing, along with an E153 transmission.

[2wickedtoyz]

well i just got a rebuilt ct26 yesturday. so i will be going single.

as for the fuel set up i'll be using injectors from a supra aswell as the fuel pump and regulator. the thing is guys is that i want my car to use oe parts and not rely on aftermarket.

zoni ufoz i understand your concern and i have addressed it over and over but i don't want any aftermarket parts on my car.

so here is what i thought up.

7mg(t)e or 2jzg(t)e pump injectors and regulator

i figure they put out more fuel then my stock setup also is there a difference in the air flow meter off a turbo supra compared to a camry's besides the size?

thank you guys for your help i really want to join the league of FI

[BLUEMEANIE]

Originally Posted by 2wickedtoyz

bi-turbo or single turbo ?

if you go "bi" I have an old maserati*"bi-turbo" emblem that happens to look exactly like the Celica's lowercase "turbo" emblem if you want to advertise

[zoni]

which engine do you in fact have? 3vz or 1mz?
this will help to determine which injectors will be better for you.
you have to consider impedance. they are all top feed from the supras, but ge are high imp, gte are low imp.

[whocares04]

i'm nearly positive he's got a 1mzfe...

[whocares04]

^^true, get a boost guage & stick it on the A-pillar, if u have an aftermarket stereo deck, u can put an air/fuel controller (apexi) in the bottom DIN part...etc

hell, modern turbo cars have a boost guage from the factory and i'm sure u rather be safe than sorry

[2wickedtoyz]

i've been doing a hell of alot of reading.

what about "reflashing" my ecu? can it be tweaked to accept boost and act like the ecu from the supra?

also according to the pressure from the turbo it spools to about 8psi. so i guess i will need some aftermarket equipment.

my engine:
1mzfe
tranny a541e
ct26 @8psi

what "stock" injectors,fuel pump,regulator can i use is the ones from the same gen supra good?

[CamNub]

On a related note to the ECU...If this is getting too off topic, I'll make a new thread.

But how does the ECU act? I know many car's ECU does small tests everytime the car runs so it can adjust. But others run the same everytime.