Thread: 4BD1T Turbo Sizing and Performance Prediction.

Originally Posted by Bush65

Just in case you haven't noticed, the engine that AM is intending to use that turbo on is somewhat larger displacement than a 4BD1. You would be advised to use a smaller turbo for a 4BD1 - see the one that Flagg has used.

Yeah, the 6258 was the only one i was able to get a satisfactory map on. With a bit of work i'm sure the 6758 would work too, but the 6258 was a better fit for driving style.

When I emailed about the freight he said if not required in a hurry he would send by Fedex inter economy package $217 Five days later its here with no stops along the way The ebay user name was fst951 worth having a look at as there is 83 pages of all sorts of interesting stuff and he seems very obligeing The turbo was a EFR7064 T3 at $1709 us .Now just need the time to set it up

AM

Originally Posted by flagg

Yeah, the 6258 was the only one i was able to get a satisfactory map on. With a bit of work i'm sure the 6758 would work too, but the 6258 was a better fit for driving style.

I can't see a single bigger than the 6258 being good on the 4BD1T. The next size up (6758) is right on the surge line which means worse compressor efficiency, higher intake temps, higher drive pressures and lower power for the same boost.

If you need more than the 6258, you're well into compound territory. Our engines go out the top of the map (pressure ratio) before they go out the right hand side (compressor flow) of these turbos along with many others. At the max PR of the 6259 (~3.8) we are at 40psi boost but even at 3600rpm we're only needing ~40 lb/min and the 6258 can provide 44 lb/min. At this point you're talking ~240kW of power.

Here is the 6258 mapped out again for a convetional tune on a 4BD1T: BorgWarner MatchBot

This is what we could get with the EFR6258 and a pump set to deliver the 140cc throughout the rpm range.


Matchbot here: http://www.turbodriven.com//performa...6_wrsin=92044&

Originally Posted by Ancient Mariner

When I emailed about the freight he said if not required in a hurry he would send by Fedex inter economy package $217 Five days later its here with no stops along the way The ebay user name was fst951 worth having a look at as there is 83 pages of all sorts of interesting stuff and he seems very obligeing The turbo was a EFR7064 T3 at $1709 us .Now just need the time to set it up

AM

You did get the 0.83 A/R turbine?

Originally Posted by Dougal

You did get the 0.83 A/R turbine?

EFR 7064 Ball Bearing Turbo 300-500 HP t3 stainless.83AR 3" Even if it does nufin looks good

Originally Posted by Ancient Mariner

EFR 7064 Ball Bearing Turbo 300-500 HP t3 stainless.83AR 3" Even if it does nufin looks good

Brilliant. It should work as well as it looks.

I've been offered a Garrett? T-04E marked A/R .50 on the compressor end and .63 on the turbine end. It is new, in the box, and FREE!
Is it going to be useable on a 4BD1, and not having any wastegate on it, do I need any other means of controlling boost levels, or should I just buy the proper turbo off Fleabay?

Originally Posted by jackz

I've been offered a Garrett? T-04E marked A/R .50 on the compressor end and .63 on the turbine end. It is new, in the box, and FREE!
Is it going to be useable on a 4BD1, and not having any wastegate on it, do I need any other means of controlling boost levels, or should I just buy the proper turbo off Fleabay?

You will need compressor wheel measurements to know.