JTD-Performance: het adres voor Performance upgrades aan JTD motoren. Ook bieden wij softwaretuning aan om de werking van de performance onderdelen te versterken en het maximale motorpotentieel te benutten.
Wij bieden performance parts aan voor veel verschillende motortypes. Alles van de 1.3 MultiJet tot bijvoorbeeld de 2.4 JTD, daarnaast bieden wij ook dieverse tuningdelen aan voor TBi en MultiAir motoren.
Bij wat meer gecompliceerde delen leveren wij handleidingen, u kunt er voor kiezen om deze op papier te ontvangen, of om ze digitaal te ontvangen via een door ons speciaal ontworpen platform.
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JTD-Performance
Engine performance parts for JTD and TBi engines
Giulia 2.2 JTDm turbo upgrade part 11: project overview and results![]()
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In late 2022 we decided to build a true upgrade turbo conversion specifically for the Giulia 2.2 JTDm. The reason, typical hybrid turbos are not delivering the results we are after, which is 350 engine horsepower with a broad powerband and zero smoke output. Especially driveability and torque at low rpm cannot be sacrificed as this takes a lot of the fun away of a street vehicle.![]()
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With the previous post #10 roughly one year ago let’s describe the mods that were done in the meantime:![]()
- Several turbo specs were tested![]()
- Modification of the CAC cooling system![]()
- CP4.1 high pressure fuel pump upgrade![]()
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Let’s start with the turbo, before we tested the 1756, 2060 and 2262. To investigate how to further optimize the turbo system we added a turbo rpm sensor. Actually the Giulia 2.2 Veloce has one on the stock turbo, but this being a Ghibli turbo doesn’t have it. So we used a Banks Power sensor that we can monitor and log with the Idash. This sensor was placed into a new compressor intake that we had custom CNC milled with anti surge slots for our housing.![]()
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First we prepared a 2365 turbo, that was far from a success. The 2365 had so much reduction in boost threshold that it resulted in low boost faults, strange vnt actuator behaviour with extreme turbo rpm spikes of up to 300k rpm, very scary. Once running at the correct boost pressure (we are talking > 3500 rpm) there was hardly any reduction in EMP compared to the 2262. ![]()
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As this turbo clearly wasn’t working efficiently and potentially dangerous we took it off and prepared a 2265. So same hotside as the 2262, only the compressor increased to a 65mm exducer 6+6 wheel. That was working better than the 2365 in terms of spool, but still much worse than the 2262. Also after a gearshift the boost dropped too much, something that was before never an issue. Somehow these turbos were not working, whatever we tried with the VNT adjustment. We decided to move back to the 2262 combination, but with a different compressor aero (from 9 full blades to 7+7 blades) and another custom made anti surge housing. That brought back the turbo response completely. Now equipped with the turbo rpm sensor we stepped up the manifold pressure to 3650 mbar absolute and with <170k turbo rpm this is still reliable.![]()
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The next mod was the CAC cooling system, or “LT” circuit as Alfa names it. It is the coolant system that cools the charge air cooler, but also the turbocharger and high pressure EGR cooler. We bypassed the EGR cooler, disconnected the turbo coolant hoses and attached those to the HT cooling system, similar to the 2.2 LIGHT engine version (that has only one cooling circuit). That led to a drop in water temp, further cooling down the intake air and increasing air density. Together with the turbo mod this resulted in higher manifold air density, so it was time to increase the fueling as well to keep the AFR at the same level.![]()
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With the stock HP fuel pump we were getting close to the limits, so we got an upgraded CP4.1 pump from Tecnodiesel. Normally when the injection amount is increased with mapping the injector opening duration is extended. As this will have its drawbacks (egt and smoke increase more) we increased the rail pressure to 2350 bar (stock 2000) with the same injector duration, resulting in more fuel flow. The upgraded pump coped very well with the higher pressure and ofcourse this led to more power, but still without any smoke. With the Performance Logger we got to 345 hp / 680 Nm, very close to the initial goal of 350 hp.![]()
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To reach the 350 mark we further increased the boost to 3750 mbar absolute, with turbo rpm still under 180k and turbine pressure (emp) max 0.5 bar above manifold pressure (map). With that we got to a 349.6 HP, which is close enough to state the goal is achieved!![]()
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See below the evolution of power and torque with the major modifications done.![]()
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Here the project ends... The Giulia JTD is being built back to stock and will make place for a new project car, which is a Giulia Veloce 2.0T ! ![]()
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Yes, you read it correct, petrol not diesel! Ofcourse we will continue developing parts for the JTDm engines, but we want to do a similar upgrading project for the 2.0T engine. Why? Basically for the same reason we did the diesel. There are upgrade turbos available (we sell these in the webshop as well) , but these seem to hit a flow limit around 370-380 hp. And yes, there are companies claiming more with their turbos (also same story with the diesel hybrid turbos) but we know there is actually very little difference across these hybrid turbos power potential. Increasing the size of the wheels simply maxes out at a certain point and going bigger does not offer more power, only reduced efficiency. So we will really dive deep into this and present it in a new series of posts. Let's see and find out what we can squeeze out of this engine!![]()
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/Edit: added a datalog for the datanerds and tuners to check out. Don't try to run these numbers with a GTD17/18 hybrid... 😉
Testing day at Circuit Zolder for Ruud Middel Rally Team with their Abarth Punto JTD. Overall big gains with the engine, with more torque out of tight corners and much more power for the straights. Still a little fine tuning needed but this will be sorted asap. We look forward to see the results of the 2026 season! 💪
Another new video from MechaNick, he has fitted our catch tank set together with a CCV separator replacement at a Giulia 2.2 JTDm. Also he mounted a prototype of the revised catch tank kit with a different placement into a slightly cooler position in the engine bay. ![]()
Check it out for a full fitting tutorial and valuable tips and tricks!![]()
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Giulia 2.2 oil soaked intake and filter - Catch can + Centrifugal filter install mod
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In this video, I’m showing you how to replace the Centrifugal Oil Filter (Crankcase Ventilation) on the Alfa Romeo Giulia 2.2 JTD and how to install the JTD-...Onze bestverkochte producten
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