Walter

what do you think about this turbo? and can somebody to explain to me how to read a boost map¿?..



Ty

Walter

oh, Ok. haha. Thank you

BTW, what do you think about this turbo? for a B16?

cll77gen2teg

read this link it will tell you how to read the compressor map. youll have to do some calculations for when (rpm) you want the boost to start and hit full boost, hp goal, etc. once you have that calculated you should be able to plot those points on the compressor map and youll have your answer. i suggest reading maximum boost by corky bell

cll77gen2teg

but i think youll be ok

rsmith2786

If you want to save some time i made a program for this about a year ago. If you go to --------------------------- and look in the tech articles you will find a full writeup about it.

Obscene_CNN

This has to be the biggest load of crap boost map I have ever seen. It definitly is targeting the gullible so called "tunner". A propper boostmap has pressure ratio between compressor inlet and compressor outlet on the verticle scale. The horizontal scale should be in some unit of mass flow rate.

Horsepower output is not a linear relationship to intake charge mass flow and boost pressure is not a fixed point on the map.

There are plenty of good articles on how to read a compressor map on the internet.

go plug in some values for your engine in this link http://www.not2fast.com/turbo/glossary/turbo_calc.shtml

you'll have to guess for some values.

Play with different rpm and boost pressures and see where they fall on the maps. You want your boost to remain in the highest efficiency areas of the map. If possible find someone who has done a dyno run a turbo that charts boost pressure and use that for data as a base line. Choose the best compressor for the altitude you will be driving at the most. Check different altitudes where you might dirve the car to make sure you don't go into the surge and choke areas of the map. You don't want to find yourself driving over a mountain pass and having your compressor wheel frag or your turbine shaft breaking.

Walter

thank guys, i did think too about horsepower output is not linear relationship... im continue thinking about T3/T04B on my B16a2 runing with 5-6 PSi... several guys did say to me that i will run very good with that turbo.. btw, i will have troubles if i runing in some mountains? ago a long time, some friends of me and me mades some meets about japanese cars and when we did go some sites and did go through sime mountain , i did see some cars like Supra, 300ZX that those are turbocars, with a lot of problems like not start or so, i will have the same problems?

Obscene_CNN

Your car won't have a problem starting if you get a mismatched turbo. However a marginal match operating at extreem altitudes can lead to compressor surge or choke. Operating in the surge and choke regions of a turbo is hard on your bearings and can cause the compressor wheel to frag or melt as well as cause the turbine wheel's shaft to snap. Operating in these regions also causes the air your turbo is compressing to get very hot which can lead to engine knock.

Even though I live at about 300ft above sea level there are idiots in the area that buy the most aggressive turbo they can afford and you can hear their turbos going in and out of surge as they drive around town. A fool and his money are soon parted.