Rb25De+Tt With A Difference...

[ARTZ]

Something like this is fine if you have access to a workshop full of tools and plenty of spare parts laying about,not to mention some major fabrication and mechanical skills needed to build something like that and make it reliable.

How reliable is it?

A worked V8 built with off the shelf parts would net you more usable torque/power and reliablitity without the need for custom bits.

Of course some prefer just to be different for differents sake..

[STATUS]

Something like this is fine if you have access to a workshop full of tools and plenty of spare parts laying about,not to mention some major fabrication and mechanical skills needed to build something like that and make it reliable.

How reliable is it?

A worked V8 built with off the shelf parts would net you more usable torque/power and reliablitity without the need for custom bits.

Of course some prefer just to be different for differents sake..

its actually very simple to rig up if you can weld. Just a y pipe from charger and turbo (one way plumber valve on charger side so boost does not push back on charger)

[ARTZ]

its actually very simple to rig up if you can weld. Just a y pipe from charger and turbo (one way plumber valve on charger side so boost does not push back on charger)

But isnt the boost feeding through the charger?

with a vortex style charger I see how that would work but the one in the picture is a roots style which would require the feed to go through it..

The intake manifold would be the easy bit but then theres pulleys custom manifolds all sorts of mounts and linkages..Even in your workshop this would take a solid week at least, in the average humble garage we are talking months of work for no great result..

Edited December 14, 2010 by Arthur T3

[Rbsongate]

geta rb25det..

[STATUS]

But isnt the boost feeding through the charger?

with a vortex style charger I see how that would work but the one in the picture is a roots style which would require the feed to go through it..

The intake manifold would be the easy bit but then theres pulleys custom manifolds all sorts of mounts and linkages..Even in your workshop this would take a solid week at least, in the average humble garage we are talking months of work for no great result..

ijm talking the rb i spoke about earlier, that v8 with the roots will be more like 800rwkw and yes flow goes exhaust-turbo-FMIC-charger-intake mounted cooler-intake- engine.

[WYTSKY]

Trent, motor in the pic looks monstrous

Just like to mention Josh that we have identical motors and with a good choice of turbo you can still get close to 10psi @ 2000rpm with good top end...

I dont have my last dyno sheet in soft copy at the moment, can upload tomorrow if your keen, but with a gt3076r with a .63 bum I have 9psi @ 2400rpm and 18psi @ 3000rpm in 4th. For added response, the turbo is assisted with a gizzmo boost controller and exhaust cam gear, thats it, on a standard manifold.

gl if you want to really try, but i would look at the new gtx3071 for even better response and all that for alot less headache

[islade]

If you wanted more response and boost sooner, why not just do an RB30DET?

[bradsm87]

I wonder how that guy deals with compressor surge on the big turbo. If the small turbo makes 20psi down really low, there's no way the big turbo could not surge at 20psi when it's not even spooled up yet. Very impressive!

Edit: I paused the vid and answered my own question lol. The big turbo is before the small turbo on the inlet side.

I wonder what the shaft speed on the smaller turbo would be with all the airflow from the bigger turbo going through it.

Edited December 15, 2010 by bradsm87

[blk94r33]

Trent, motor in the pic looks monstrous

Just like to mention Josh that we have identical motors and with a good choice of turbo you can still get close to 10psi @ 2000rpm with good top end...

I dont have my last dyno sheet in soft copy at the moment, can upload tomorrow if your keen, but with a gt3076r with a .63 bum I have 9psi @ 2400rpm and 18psi @ 3000rpm in 4th. For added response, the turbo is assisted with a gizzmo boost controller and exhaust cam gear, thats it, on a standard manifold.

gl if you want to really try, but i would look at the new gtx3071 for even better response and all that for alot less headache

Good to see gear from some people with a positive attitude! And Trent that motor does look epic! Adam, been reading through your progress in the DE+T thread and must say i'm duly impressed with your work!

This isn't so much of a should-I-do-it thing, just been browsing/searching and looking at different set-ups people have tried, and figuring that everyone wants boost from idle through redline (from a performance POV), could this be a happy medium? As Trent said, the setup he mentioned cost $1500 with the right knowledge and tools/equipment (obviously minus labour etc. etc.).

Most people are doing a DE+T for less than $1k, so surely the parts to complete this wouldn't exceed $2k, no, it's not going to make 11ty killerwasps, but to drive with such a mid-range punch? Maybe I'm thinking too much...

(And as i've said repeatedly, this is purely from a theoretical point-of-view using the aforementioned set-up as an example to express an idea.)

[blk94r33]

Something like this is fine if you have access to a workshop full of tools and plenty of spare parts laying about,not to mention some major fabrication and mechanical skills needed to build something like that and make it reliable.

How reliable is it?

A worked V8 built with off the shelf parts would net you more usable torque/power and reliablitity without the need for custom bits.

Of course some prefer just to be different for differents sake..

Check and check..

its actually very simple to rig up if you can weld. Just a y pipe from charger and turbo (one way plumber valve on charger side so boost does not push back on charger)

I think this would be the major issue with a set-up like this, physically fitting two turbos to a car has been done (duh), but getting everything to work in the correct sequence, such as stopping the smaller item to allow the big one to take over, whilst not losing exhaust flow, and also keeping the smaller item going so it doesn't have to start again on a gear shift, and also preventing any kind of loss back through the system.

geta rb25det..

+10 for originality and value of input...

[bubba]

So much easier to build an RB30DET..

RB25 turbo on my 30DET spooled from idle (had to tighten the bov right up as it was pushing open at idle), made 12psi by 2200rpm and 183rwkw at ~4600rpm (compared to the same turbo on my old 20DET which made 12psi by 3500rpm and ~180rwkw about 6500rpm).