My Sequential Twin Turbo Setup. (April Fools!!!)

[S14DB]

I got a T25 SR turbo and am going to use it to spool my other turbo. The compressor outlet of the T25 is going into the intake of the big turbo. The big turbo will then compound the pressure.

Here are the two turbos. I'll have the manifold test fitted on Sunday and have pics up.
http://img.photobucket.com/albums/v108/S14DB/240sx/turbo/BigBoyVsLittleMan.jpg

[Irukandji]

haha that's awesome

[Lucivar619]

We'll try to keep the drooling to a minimum. :hyper:

Can't wait to see this setup.

[SpeedMonkeyInc]

Cool! Can't wait to see pics of the manifold and charge pipes and all that stuff.

[Muzzy]

whats that other turbo??

[go240]

cool, hopefully it all goes smoothly. i'm interested in seeing the manifold

[Daniel.]

I think I am totally wrong here, and someone correct me if I am, but isn't a sequential setup where 1 turbo spools then the other follows?

Whereas, in a compound setup you have a high pressure turbo (the t25 in this case) and a low pressure turbo (the other turbo). I've read that this setup is mainly used on diesel engines and the low pressure, larger turbo is used to spool the smaller high pressure turbo. (Kinda backwards thinking but hey, that's what I've been reading.)

[!Zar!]

Show off. haha
Nice set up. I envy it.

[Daniel.]

After some poking around....

I found what i was looking for. A compound turbo setup on a diesel is totally different from a sequential setup.

A compound setup uses the larger turbo to spool the smaller one in order to multiply boost pressure. We're talking 80 - 200 psi of boost here.

Where as in sequential setup (RB26DETT, 2JZGTE, 13B-REW) the smaller turbo is used to eliminate turbo lag.. etc etc etc... :p

[Muzzy]

uummm...no those motors u listed with twin turbo set ups have i dentical twin turbos......except the 13b it really only one turbo.

[Daniel.]

http://img.photobucket.com/albums/v323/spidermansro/turbos.jpg

I wasn't ever too sure about the RB, But i'm positive the 2JZ and the REW are both sequential setups.

The above picture is an REW setup. Looks like 2 turbos to me...

[Muzzy]

u sure??? from what i have seen there is only one flange and one turbine but 2 compressors on the turbo (13B).

[Daniel.]

Sorry for all the threadjacking...

But no, im not 100% positive, which is why i was asking in the first place. I found the picture on the internet, and you can't be sure about anything 100% when it's on the internet.

S14DB, can you explain your setup a little more? It'll rectify the whole situation.

- daniel

[liv2drift045]

rew's are twin turbo... u can just look at the picture... sure there arent TWO downpipes but there there are two exhaust housing and two compressor housings... u can see right there in the picture

[spdfreek0o]

This sounds very interesting, I can't wait to read the results.

A compound setup uses the larger turbo to spool the smaller one in order to multiply boost pressure. We're talking 80 - 200 psi of boost here.

Wouldn't there be some multiplication of boost pressures when using the smaller turbo to spool the larger one? The only difference in the turbo's is how much psi it can handle in its efficiency range. So if a larger turbo spooling a smaller turbo creates more pressure, wouldn't a smaller turbo spooling a larger turbo also create more pressure just in a different range?

[alexchanman]

please explain more of this setup, i am also very confused of this.

[sr20newb]

wow, this should be awesome post pics/vids when it done

[datboibrad]

dont desil trucks run something like that? where one turbo flows the other?


edit- im starting to think this is an april fools joke

[S13 Charlie]

Where as in sequential setup (RB26DETT, 2JZGTE, 13B-REW) the smaller turbo is used to eliminate turbo lag.. etc etc etc... :p


The RB and the 2JZ are twin turbo = two identical turbos. the 13B that came in the FD RX-7 was a sequential setup with one small turbo for low rpm, and a larger turbo for higher rpm. The larger turbo kicked in at about 4500 rpm i believe. If you read about how FD's spool up, they are supposed to spool to 10 psi, then drop to 8 psi and build back to 10 psi. The drop is when the flow kicks to the larger compressor..

Back to the proper thread - sequential setup on a KA, SR? please tell us more!! I dig the idea, and it would be trick if you can pull it off smoothly!

[wootwoot]

twin turbo parallel for the 2jz and rb26dett
sequential for the 13brew( 3rd gen rx7 and 2rotor Cosmo) described well by Charlie
Compound is what is being described here.

[Team Rootbeer]

cool idea, what motor is it going on? SR? KA?

[NemeGuero]

Ka...

and you're nuts AJ.

[Id-]

The RB and the 2JZ are twin turbo = two identical turbos. the 13B that came in the FD RX-7 was a sequential setup with one small turbo for low rpm, and a larger turbo for higher rpm. The larger turbo kicked in at about 4500 rpm i believe. If you read about how FD's spool up, they are supposed to spool to 10 psi, then drop to 8 psi and build back to 10 psi. The drop is when the flow kicks to the larger compressor..

Back to the proper thread - sequential setup on a KA, SR? please tell us more!! I dig the idea, and it would be trick if you can pull it off smoothly!

twin turbo parallel for the 2jz and rb26dett
sequential for the 13brew( 3rd gen rx7 and 2rotor Cosmo) described well by Charlie
Compound is what is being described here.


Stop being idiots guys.

The 2jz is twin SEQUENTIAL... you don't have to have different sized turbos for sequential to work; get your head out of the sand! When done correctly the first turbo can spool 17-19psi and make 400ft-lbs+ of torque before 3500rpms

If you read about how 2jz's spool up stock, you'd see they hit about 11psi, then drop down to about 9, then spool up again to 11. Both the FD and JZA80 can be modified to run in true parallel mode; but the lag suffers horribly.

13B-REWs have identical turbos nearly; the only difference is the turbine.

The early 1jz is twin parallel where both turbos spool the same. The late 1jz is a single. I cant comment on the RB series of motors since I'm unsure.

We are discussing compound here, but the idea being expressed here is completely backwards of REAL compound turbocharging. The only person I know of to explore this option fully was cowboybebop on supraforums; and I'm unsure of how far he got.

[fatalfury64]

It would be crazy if you pull it off. I would like to see a ka24dett or an sr20dett. Both results would be off the charts.

[S14DB]

Basically the T25 is going to be used up to 14psi. Then a big wastegate opens up and allows exhaust gas to the big turbo to spool up. There is a Throttle body in front of the big turbo that keeps air from bypassing it before it spools up.

I am not going with the compound set up as it would be to difficult to calculate the turbines efficiency ranges.

[S14DB]

APRIL
F00LS

It is entirely possible to do. Look at the Porsche 959.

[SpeedMonkeyInc]

Cool! Can't wait to see pics of the manifold and charge pipes and all that stuff.

http://0wn3d.dk/owned/Mc-Own3d.jpg

[Daniel.]

APRIL
F00LS

It is entirely possible to do. Look at the Porsche 959.

:doh:

pwned me good.

[Irukandji]

you suck


msglengthbythewayyousuck

[Muzzy]

i think u are wrong about teh 2jz though.

[Daniel.]

http://to4r.com/faq.php

http://www.mkiv.com/publications/other/auto_speed/1999/index.htm

http://mkiv.supras.org.nz/techo.htm#TURBO_MISC

It's twin sequential

[Muzzy]

nads!

sfskjflk

[CaoBoY]

nope. he's right. first turbo spools up then the other. once the first turbine hits a certain psi a butterfly opens, and spools the second also. yes, removes lag. in the ttc (true twin control) mod, both turbines spin at equal rates. boost is a lil bit laggy(not much though!) and when it hits, it hits quick and hard would break traction very easily in an automatic 2nd gear. like butta.

[S14DB]

Nice thing about the 959 is that it opens up the WG to spool up the bigger turbo before opening the intake diverter valve. There is no lag when the second turbo kicks in. Unlike the Mazda and Toyota designs which have a dip in boost when the second turbo kicks in.

Toyota clams to do this. But the DV valve is Vac controlled not ECU. The Supra system seems to always create a dip when the second turbo kicks in.