TD04 turbo.... useful?
Turbo Mini Forums

Hi there, went down to a local engine dealer today. One of those places specialising in jap imports. Told them I was looking for a T25 or equivalent.

They said they had a few second hand TD04's around, had a look at them, didn’t seem to have any shaft play. Anyone know anything about this turbo and whether its worth using?

Also are there any tips for when looking at buying a used turbo? Should I stay away from anything with even minute shaft play?

Appreciate it
Greg

http://www.stealth316.com/2-3s-compflowmaps.htm

http://www.kickflop.net/wp/index.php?p=19


Just a couple of maps easily found from googling for TD04 turbo map.

There are plenty of others.

All you have to do now is work out what engine spec / power / revs your after and compare that with the maps ....

Several posts on here on how to read compressor maps if you don't already know how.

Every day is a school day ...........

How fast and how expensive ...... the same question...

you shoul find a part number on this tdo4, which one? 13t 9g etc ??? if it does have the good compressor, I highly recommend it

Thanks for the replies... I wont lie though.. those graphs are quite daunting

So fab, you recon it should be fine running on a 1330? How will I be able to tell if it's the 13t 9g?

CR# with all due respect mate I think you would really benefit from learning a little more about turbo selection.

There are loads of posts on here about it (remember to make sure the "search post body" box is ticked).

http://www.turbobygarrett.com/turbobygarre...bo_tech101.html

The above is another good resource about turbochargers in general, obviously they use their own products as examples but it's a good generic read for the first time turbo selector!!!

Every day is a school day ...........

How fast and how expensive ...... the same question...

depend on the boost/power you can put thru your a series, I would choose a tdoa4h11t for power figs up to 170 then upgrade for a 12tor 13t one (11t and 12t ar mainkly founds on volvos, 13t is found in some scoobies

Anyway had a look calculating what turbo would suit my 1330. I will say that you were right RogerM, there’s a bit more to it than I originally thought.

I'm planning at first to run it at +-8.5psi boost to produce around 120bhp at the flywheel, well that’s what the maths said, and it does seem about right for a intercooled system.

Some time in the future thou with many gearbox upgrades, I'd like to get some 160 bananas (which came out at being +- 15psi boost) out of the system for short periods of fun , so will need a turbo to be able to cope with that as well.

I know that I can get the TD04 13g and GT1548 turbo locally, but it seems the TD04 would be a little close to "choking" trying to produce the 160bhp. Would this be fine? Or would I need something bigger? The GT1548 would produce its power more near the top of the engines rev range.

Just for interest sake I also plotted my engine on the T3 40-trim(Correct me if I’m wrong, but I think that was the std metro turbo unit). I was quite surprised how similar it performs to the other "much smaller turbo's", and its A/R doesn’t seem much different either.

Did add the three compressor maps to show where the engine lies. I guestamated a few areas thou, one being where the engine produces max power and peak torque.

Would like your guys opinions on what you think, and maybe if I went wrong anywhere.

/Greg

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ahh, got pics attached!

Edited by CR# on 3rd Jun, 2007.

Can anyone help?

I would recommend the TD04 based on your requirements.

OK, so it's close to the choke line at 6500rpm, but how often are you going to get there? It's great at 4500rpm where you will want peak torque.

The other thing to consider is the compressor efficiency. The TD04 is at 78% peak and the others are only 72%. That means that you will get more into your engine at a given boost, assuming the same intercooler efficiency for all.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Thanks for the help Axel.

td04 is best one , though your points are on the high side, so you are comfortable with it at 160bhp .

What do you mean by that? I wouldnt be running it at 160bhp, but would like it to be able to cope with it if I did upgrade the gearbox with high spec stuff at some point.

And thanks for the reply... I think people dont reply due to the graphs, lol.

Edited by CR# on 3rd Jun, 2007.

We love graphs here ... shows people are thinking about things.

This is more of a discussion forum than a Q&A site ..... that what makes it so cool. Don't be frightened of putting your thoughts or calculations up on here ... nobody will shout you down but if your mistaken they will tell you in a polite and considered way ....... welcome aboard!!!

Every day is a school day ...........

How fast and how expensive ...... the same question...

well an aseries is around 0.42 bsfc at peak torque and grow to around 0.50 at peak bhp.that's give around 16,5 lb/m
you've plotted them at 17.5
replot your 13g map, you'll see that your ok at 160bhp,
cheers
fab

So folks, what do we know about the turbine side?

Every day is a school day ...........

How fast and how expensive ...... the same question...

Not enough.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

I think guessed and used quite a high bfsc when calculating. Think I used .60

found this aswell.

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Punching a 2.2PR and 6500 rpm into my calculator, I get 17.2 lb if I use my 'A-Series' correction factor.
If i assume a 16v head (like the K1100), then I'm up at around 18lb.

My figures are clearly higher than Fabs; but I've never yet had a problem with surging or choking.

yes Dave your right,at 2.2 pr it will certainly sort more than 160bhp
I didn't used classic method for airflow(rpm ve cc etc) just calculated 160 bhp airflow

ah - I get you...
You were working to the POWER requirement. :)