Thread: 4BD1T Turbo Sizing and Performance Prediction.

Thanks dougal so far what i can tell it is a RHF5V tho finding sizes and specs for it is not easy .

I wont have it here till mid to late next week so untill then im only working off 2 pics to gain info but from what i can tell is that it has a mechanical actuator on the backing plate for the vanes and it has a 7 blade compressor wheel and the compressor housing has slots cut on the inside of the inlet around its circumfrence

Originally Posted by lokka

Thanks dougal so far what i can tell it is a RHF5V tho finding sizes and specs for it is not easy .

I wont have it here till mid to late next week so untill then im only working off 2 pics to gain info but from what i can tell is that it has a mechanical actuator on the backing plate for the vanes and it has a 7 blade compressor wheel and the compressor housing has slots cut on the inside of the inlet around its circumfrence

The slots are to increase the map width. This is common some larger compressors, but not small.

VNT and enhanced map width, you probably have made a good score there.

The slots are there to aid in the prevention of surge.

Hi Dougal, all,
I was given a Saab TE05-12B off a mate's car. Part number is 911930_ (_=6 according to research but not stamped on the data plate). Made by Mistubishi Heavy Industries, and also fitted to some Volvos.
Specs are on this page:
90-97 Saab 900 EL TE05-12B-6 Turbo 49184-02200
I expect it'll be too small, off a 2 litre 4 pot, and the Saab forums say this turbo gives quick spool up, but that's petrol engine stuff and I know nuffink!
Currently I am climbing steep hills one gear lower than friends with tdi Defenders, i'd like to match tdi road performance on road, mid range I suppose, off road I have no power/torque complaints at all
I think its water cooled, whether that matters or not.
Also got the intercooler off the same car.

Originally Posted by isuzutoo-eh

Hi Dougal, all,
I was given a Saab TE05-12B off a mate's car. Part number is 911930_ (_=6 according to research but not stamped on the data plate). Made by Mistubishi Heavy Industries, and also fitted to some Volvos.
Specs are on this page:
90-97 Saab 900 EL TE05-12B-6 Turbo 49184-02200
I expect it'll be too small, off a 2 litre 4 pot, and the Saab forums say this turbo gives quick spool up, but that's petrol engine stuff and I know nuffink!
Currently I am climbing steep hills one gear lower than friends with tdi Defenders, i'd like to match tdi road performance on road, mid range I suppose, off road I have no power/torque complaints at all
I think its water cooled, whether that matters or not.
Also got the intercooler off the same car.

The specs show that is a TE05, which is a size range I haven't looked at yet. The best MHI turbos are the TD04HL's. The HL is the turbine and you can either see what compressors they come with or buy a compressor upgrade kit (wheel and cover) off Ebay or the like.

I have also found mistakes in some of the graphs and figures I have posted up here. I'll correct them as soon as I can find the time.

Pretty sure it is the Saab turbo that Offender90 reckons is the equal of his, albeit water cooled rather than oil cooled:
http://www.aulro.com/afvb/isuzu-land...ml#post1627509
Hope it is, seems he is happy with that turbo.
From much googlism, seems the TE05-12B has:
.48A/R turbine, .42A/R compressor, 45 trim, inducer is 40mm dia, and has a T3 exhaust flange.

Better alternative to the borg warner at ALOT better value would be a Holset HX35 7 Blade T3 twinscroll 12cm rear.

Bloody tuff unit & would kick in sooner with a twin scroll housing in the smaller size compared to the non twin housing on the BW in the same rear housing size.

For around the same price as the BW delivered you could have a Holset & most likely a custom T3 twin scroll manifold...........alot better value

As for a TDI, im currently running a TD04-15T from a saab aero. No complaints, ALOT of torque & holds speed pretty good. Not near as laggy i thought it would be, not to far off the stock unit. My injector pump is maxed on the boost compensator & there is definately room for more power but that would mean fiddling with the full power adjustment which i dont want to do at this point. EGT's struggle to reach dangerous levels due to the turbo size which is another bonus. takes a very long hill, 4th gear flat out to even touch 600 degrees

Originally Posted by isuzutoo-eh

Pretty sure it is the Saab turbo that Offender90 reckons is the equal of his, albeit water cooled rather than oil cooled:
http://www.aulro.com/afvb/isuzu-land...ml#post1627509
Hope it is, seems he is happy with that turbo.
From much googlism, seems the TE05-12B has:
.48A/R turbine, .42A/R compressor, 45 trim, inducer is 40mm dia, and has a T3 exhaust flange.

The 40mm inducer is the first clue that it's a suitable size. If you have it already, I'd fit it and try.

Originally Posted by chang

Better alternative to the borg warner at ALOT better value would be a Holset HX35 7 Blade T3 twinscroll 12cm rear.

No, a thousand times no.
The HX35 on a 4BD1T isn't even out of surge until about 2,500rpm. Even when it crosses the surge line, it's so far left on the map that efficiency will be terrible.
Any altitude or filter restriction will push it even further into surge.

The HX35 is on this map, it's the yellow line. The red with blue dots is the 4BD1T demand line. They are a terrible match.