Thread: 4BD1T Turbo Sizing and Performance Prediction.

Ben, which turbo has your Saab got?

Dougal Thanks for the sugestion I will most likely go with the EFR7064 I have tried to make
sense of the all the info provided but afraid it was all wasted I did read somewhere that that the twin scroll version was nearly as good as a variable unit without the complications About $170 extra and the need to fabricate a new manifold.Worth it?
Any Comments or sugestions gratefully received either pos or neg

Originally Posted by Ancient Mariner

Dougal Thanks for the sugestion I will most likely go with the EFR7064 I have tried to make
sense of the all the info provided but afraid it was all wasted I did read somewhere that that the twin scroll version was nearly as good as a variable unit without the complications About $170 extra and the need to fabricate a new manifold.Worth it?
Any Comments or sugestions gratefully received either pos or neg

For a divided manifold to help on a 4 cyl, you need to pair 1-4 and 2-3 runners together.
I think even with a single port, you won't struggle for spoolup. You've got a short rev range compared to passenger car diesels which need a VNT.

Depends how much free time you've got to build a manifold I suppose.

Free time over next 12 months [ none going sailing] I am just trying to get a
heap of gear together for the next Defender episode I have put the D back together with the 3.0 diffs so it is at least mobile .The 300 tdi s get up and go seems to have got up and gone As regards the twin versus single do you think the rewards of the twin would justify the effort ?


Many thanks Noel

Originally Posted by Ancient Mariner

Free time over next 12 months [ none going sailing] I am just trying to get a
heap of gear together for the next Defender episode I have put the D back together with the 3.0 diffs so it is at least mobile .The 300 tdi s get up and go seems to have got up and gone As regards the twin versus single do you think the rewards of the twin would justify the effort ?


Many thanks Noel

I would just fit the single entry housing. If it were a 6 cyl I would definitely use the double entry.

I emailed the 2 of the borgwarner Aus agents 1 replied after a week saying BW made a EFR but they didnot have a listing the other didnot reply.Why would you bother? OK off to ebay $586 freight Emailed them and asked if the freight whas a ebay thing or could he do something a bit more realistic ? so bought it on the 16 th arrived yesterday .A bit more complicated than what I am used to CRV recirculation valve and boost control solernoid valve ?

AM

Hey AM, I had the same problem - ended up going to Treadstone Performance in the US.

You can get a blanking plate for the CRV, but it doesn't do any harm as long as it sees boost so just plum it to the inlet manifold and you should be OK. As you don't have an ECU the BCSV can be removed.. I used the nipple for a mechanical boost gauge.

Thanks for the reply much the same as I figured just wondering about the BSV IF you switched that with a switch you could control your waste gate (good or bad right or wrong)

AM