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JBS Twin Scroll Turbo Development

JBS Sales

Guest
We are currently developing a new turbo application for the 1.8T, there are two stages available which with our hybrid turbo versions will be able to offer up to 550bhp, with full boost predicted between 3000-3500RPM depending on spec.


Key features include:

Twin Scroll Design for better response and spool
New More efficient and larger compressor preventing compressor surge
Better pump gas efficiency
Turbine Nozzle Area (cm2) = Large 10.5 hotside, single flapper.
Improved actuator design


A "twin scroll" or "divided inlet" means that there are two separate volutes within the turbine housing. The main reason for doing this is to isolate the pulses coming from each exhaust port and maintain more of the pulse energy from each cylinder all the way down to the turbine wheel. There are no differences between the turbine wheels used in open or single inlet turbines compared to those used in twin or divided inlet turbines.
Generally speaking, a divided inlet turbine setup will respond faster and produce boost quicker than single or open design of the same nozzle area, of course this is dependent upon proper execution.
While it does not cause any problems or harm to run a divided inlet turbine housing on a manifold that is an "open" design, none of the benefits of the twin inlet will be seen.


With this new turbo set up we will be using our ST316SS SC40 equal length twin scroll manifold for optimum performance.


Here is our twin scroll based equal length manifold.

TwinScrollMan1.jpg

TwinScrollMani.jpg


Again with a twin scroll based turbo.

TwinScrollMani2.jpg


We have an Audi TT 1.8T 225 booked in for this turbo conversion at the beginning of next week. We will be posting pictures as the kit is being built and of the final product with a full review and RR data.


Then after the Audi TT we have an Ibiza 1.8T booked in for the same conversion again I will post build and final product pictures and RR information.


This turbo set up will also be offered in kit form with fitting instructions and step by step photos for all the 1.8T range.


If you would like anymore information please feel free to give me a call on 01246 455005


Regards
Mike
 

JBS Sales

Guest
Latest update on the JBS twin scroll 1.8T turbo applications:

Latest developments show the twin scroll design to be the perfect solution for low spool, high power and factory look turbo applications, as you can see from the pictures below design and production of this highly complex manifold and components are nearly complete.

The pictures show our fabrication department, manifolds on jigs to ensure perfect fitment and location every time.

The final kits will use split downpipe, 3” outlet, 2” dump pipe, 3” inlet pipe

For 225 applications you can use the factory boost outlet pipe, factory engine cover and location.

Further testing has shown 1 bar boost at 2250RPM, 2 bar boost by 3000RPM :D

Manifold, jig and fabrication area.
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JBS Sales

Guest
Further to the update, more pictures:

Turbo and manifold
P1011674Small.jpg

P1011673Small.jpg

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Me holding the downpipe
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Pictures with this kit on the car and in kit format to follow very soon.

Mike
 
May 2, 2006
2,758
0
are the 2 sets of pics the same turbos?
1st lot of pics the turbo is top mounted
2nd lot of pics its not?:confused:

looks feckin awesome though :thumbup:
 

Feel

Veedubya 'velle
Jun 12, 2003
4,918
2
Midlands
are the 2 sets of pics the same turbos?
1st lot of pics the turbo is top mounted
2nd lot of pics its not?:confused:

looks feckin awesome though :thumbup:

I think you're supposed to be looking at the manifold on the bench. The one on the engine in the workshop pics is one of their IHI Hybrid Turbos, I think.

Edit: I think we should start a caption competition on the "Me holding the downpipe" picture :D
 
Last edited:
May 2, 2006
2,758
0
I think you're supposed to be looking at the manifold on the bench. The one on the engine in the workshop pics is one of their IHI Hybrid Turbos, I think.

yeah i seen that, looks awesome! (the whole lot does tbh)
was just wondering which turbo was the twinscroll one from the latest pics and i presumed its the bottom mounted one, i was just checking :)
 

ran_s

Guest
Hi Mike

do you planning on makeing those kits for A4/passat engine ?

i think i know that welding guy:) (G.S ? )
 
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