Thread: 4BD1T Turbo Sizing and Performance Prediction.

Well my VVT has turned up all the way from tassie so i pulled it to bits so i could have a measure up and here tis my findings

Comp 41mm IN 56mm ex Wheel is 22mm tall

Turbine 44.3mm IN 50mm ex wheel is 22.5mm tall

My calcs if im right say its 53.6 trim comp 78 trim turbine

Turbine housing has 44.5mm inlet 47mm outlet

Comp housing has 42mm inlet and outlets

I think it will be a good unit to fit up to my 2.6L TDI300

Originally Posted by flagg

How accurate do you think the intake cfm figures are?



My filter service indicator is tripping and I've only done 2000 road km since new....

Your filter indicator will show the vacuum that results from your whole intake tract. Filter, piping, snorkle, actual intake etc.
Tell me what your peak boost is at ~3200rpm and I'll give you a decent indication of CFM.

Originally Posted by lokka

Well my VVT has turned up all the way from tassie so i pulled it to bits so i could have a measure up and here tis my findings

Comp 41mm IN 56mm ex Wheel is 22mm tall

Turbine 44.3mm IN 50mm ex wheel is 22.5mm tall

My calcs if im right say its 53.6 trim comp 78 trim turbine

Turbine housing has 44.5mm inlet 47mm outlet

Comp housing has 42mm inlet and outlets

I think it will be a good unit to fit up to my 2.6L TDI300

Same wheel specs as my GT2256V from a Merc Sprinter 270CDI. It will also do what most people want on a 4BD1T. 23psi (enough to burn full fuel) to 3200rpm. 20psi to 3,500pm.

Originally Posted by Dougal

Same wheel specs as my GT2256V from a Merc Sprinter 270CDI. It will also do what most people want on a 4BD1T. 23psi (enough to burn full fuel) to 3200rpm. 20psi to 3,500pm.

Ok i thought it was a bit small for the suzi and i planed to fit it to my TDI300 as it should give it a bit more low end poke

Originally Posted by lokka

Ok i thought it was a bit small for the suzi and i planed to fit it to my TDI300 as it should give it a bit more low end poke

40mm compressor intake is good for about 28 lb/min of airflow. That's over 170kw on a diesel if you get everything sorted.

Originally Posted by Dougal

40mm compressor intake is good for about 28 lb/min of airflow. That's over 170kw on a diesel if you get everything sorted.

Well i plan to have the pump checked out and recalibrated soonish then fit this VVT and i have a large FMIC and pipe work to plumb it in .

With the motor now at 25K since full reco screwed out to 60 thou over size and new turner head its run in but i rekon the the pump timing is holding it back as it is now

Im happy with it tho i would like more poke so this turbo the bigger cooler and having the pump set up right should make it more fun to drive

Originally Posted by lokka

Well i plan to have the pump checked out and recalibrated soonish then fit this VVT and i have a large FMIC and pipe work to plumb it in .

With the motor now at 25K since full reco screwed out to 60 thou over size and new turner head its run in but i rekon the the pump timing is holding it back as it is now

Im happy with it tho i would like more poke so this turbo the bigger cooler and having the pump set up right should make it more fun to drive

With Alfin pistons?

Originally Posted by Dougal

With Alfin pistons?

No the good german ones that turners in the UK suplyed i cant remember the name koblen or something like that

These ones http://www.turnerengineering.co.uk/a.../info_264.html

I didnt cut corners with the reco and i uesd all good quality parts from turners and DLS in the UK and fitted new bosch injectors only things that were reused or not recoed were the turbo and its high pressure oil line the injector pump and the vac pump every thing else is new