http://not2fast.wryday.com/turbo/maps/all.html

Not sure if that's been posted before, but it's the largest listing of compressor maps I've found. Even has Eaton and vortech supercharger maps.

 

Nice find. I just saved a copy on my server.

 

GRAPHS*

 

does any body know how to read the gas turbine flow maps

 

Yeah, I also have this info saved. It's very useful if I knew how to read it. I think the compressor map experts on this forum should do a FAQ on this.. If you are very knowlegable reading it, then you can know what application best fit your needs.

 

yeah can you share the how to read info

 

I know how and could try to explain it but it probably wouldn't make as much sense as some of the writeups do. I found these two articles helpful. Personally I like doing the calculations and stuff so I find playing with compressor maps fun,

http://www.turbosaturns.net/articles...sor%20maps.htm

http://www.turbosaturns.net/articles...20part%202.htm

 

well i followed what turbosaturns.net said, and figured i would add the airflow charts for the VQ30de, Vq35de, and AEBS VQ43de for ***** and giggles, since most people won't want to sit down and do it themselves...

Neal if you see any discrepancies based on your calculations let me know...

 

Are you using 4241cc for the AEBS 4.2 liter?

Or 4369cc for the AEBS 4.4 liter?

 

sorry matt, i forgot about those discrepancies you figured out...guess i should redo that chart. I just used a straight 4.3l, it falls basically between the two though...

Not that it really matters, but which is turbo motor displacement?

 

I have a question about t04e compressors. I have seen 57 trim with .60 A/R and I've seen 57 trim with .50 A/R. When you look at those compressor maps, the 57 trim doesn't show the compressor size. Does anybody know if the 57 trim compressor map is partaining to .50 or .60 A/R? I'm sure it will effect the flow rate.

Ebay sells the 57 trim .50 A/R for cheap! This is a link:

http://cgi.ebay.com/ebaymotors/ws/eB...category=33742

And www.cheapturbos.com has the 57 with .60 A/R. Here is the link:

http://store.yahoo.com/cheapturbo/gart3to450tr.html

I am hoping someone can clear this up for me. I used 57 trim as an example and on both of those links, it clearly shows the compressor size. I am actually leaning towards the 50 trim, but I don't know if I'll go with .50 or .60 A/R compressor size. Any thoughts on this would be greatly appreciated.

 

Anybody? 12345

 

All this turbo talk recently makes me want to bump this thread. Can anybody answer this? I might post on www.homemadeturbo.com to see if they can answer it.

 

I wish I could say I know, but I don't. I've often wondered the same thing myself. There must be another part of the turbo selection process, but I don't know what it is other than a higher AR means higher flow volume but less velocity.

 

the best way to answer this would really be to graph the compressor map and see how well your engine matches up with it. basically, you want to make sure that the compressor isn't so big that its bordering on the surge line but not so small that it can't push enough boost for some high power.

here's a real good site on figuring up the compressor maps and such (i can't remember if i've already given you this or not... so i'll just give it to you again :lol ) http://www.turbomustangs.com/turbotech/main.htm

 

the problem is that the compressor maps dont take into account the A/R. they focus on the trim

if you run 10psi a .50 .54 and .57 trim will all be fine but a .60 trim will surge if you make full boost before 4k rpms but will be the most efficient at red line

you can use a .50A/R or .60A/R with any trim TO4E compressor wheel

from my understanding is that a smaller compressor A/R will spool the turbo faster but choke the top end just like on the exhaust turbine side A/R

 

Yes, I know how to read compressor maps just fine. But my question was, how do you tell what A/R the 57 trim is? The compressor map doesn't specify. And A/R will make a huge difference in where your plot points are.

 

accually the A/R has nothing to do with the compressor maps

 

Really? So you're saying a 57 trim with a .50 A/R will plot exactly the same as a 57 trim on an .83 A/R? I'm not even sure if it's possible to do a 57 trim on an .83. If you know anything about turbos, hit me up on AIM sometime.

 

Well think about it, the points you plot on a compressor map are made by YOU. They aren't dictated by the compressor map. You plot the points by saying "I want the turbo to make xxx boost at yyy rpm" and then you have a point. Then you say "i also want it to make aaa boost at bbb rpm" And there you have another point, and so on. That says nothing about the ABILITY of the turbo to spool to that level, and that's where the A/R comes in. You can plot any point on any compressor map you want... say you want your 1.5L civic to make 40lbs of boost at 1000rpm on a T88 turbo. You can plot that point without a problem (actually it would likely be off the scale but really compressor maps are just a snippet, a portion of the ENTIRE map for the compressor). But just because you can plot that point, doesn't mean those parameters can be met in reality...

Basically with compressor maps what you are doing is saying "ok i'd like to make this boost at this RPM, and this boost at this RPM, and this boost at this RPM" and then you start plotting them, and see how well they match up to the various maps. That way if you want to be able to see 5lbs of boost on a 3.0L engine at 2000rpm and 10lbs of boost at 3000rpm and hold 10lbs to 6500rpm, you can plot those points on various maps and figure out what trim wheel works best for those desired parameters and keeps your turbo in the most efficient range possible, throughout the desired part of the RPM band (whether you want midrange power, or extreme high end power, etc).

 

yup thats exactly what im saying

and for reference the avalible compressor A/Rs avalible for the TO4E are .50 .60 .70

the avalible T3 turbine housing A/Rs are .48 .63 .82/.83

the avalible T4 turbine housing A/Rs are .58 .69/.70 .81/.82/.84 and bigger but you wouldnt want to go any bigger

and like stated before for your aplication being an auto id proboly go with the T3 .63A/R since mardi has the T4 .58 and it still takes pretty long to spool

 

this would probobly be the most ideal turbo for an auto wanting decent spool but yet still decent top end

http://store.yahoo.com/cheapturbo/gart3to457tr1.html

you could still make over 300whp with it to

 

Thanks Neal and Subs.

Subs, that is one of the turbos I am thinking about getting. I am definitely getting a t3 turbine with a .63 A/R. And the compressor will either be a .50 or .60 A/R. The trim will be anywhere from 50 to 60. I have not completely made up my mind about this. I see the t3/t04e go for CHEAP on ebay. But it's a 57 trim with .50 A/R for compressor and .63 A/R for turbine. Do you have any input on a .50 A/R? I would definitely like to still make some awesome power from 5K to 7K rpm. But since I love the drag strip SO much and slicks aren't a problem, I would love to see some nice boost when I launch out of the hole at 2500-2600 rpm. But I don't want to lose boost above 6K rpm. Any ideas? Don't say nitrous, that will come much later.

I wonder about the new line of GT turbos from Garrett. If I get a nice BB turbo, it might be possible to make power from 2500 to 7K rpm. Comment?

 

if your on a buget just get the .50A/R ebay turbo thats a good deal and get the thing working on the car. then go to the dyno and if your top end looks good your fine if your not satisfied upgrade to a .60A/R housing like this one and your good to go

http://cgi.ebay.com/ebaymotors/ws/eB...936409476&rd=1


the garret GT30R like this

http://store.yahoo.com/cheapturbo/gagt56tr.html

would be even better because its alot more efficient. you get the top end efficientcy of a 60trim to4e without the low rpm surging and of course better spoolup with the ball bearing cartridge

 

Yeah, you're right. It's best to just get this thing working in my car first. After that, it will be easy to change turbos if I feel the need.