I have read the stickied threads and looked at the compressor maps for some turbos. I tried to follow what they were saying, but still got lost.

When you look at a map and you see the oval shapes is the innermost oval the turbos maximum efficiency, and the surrounding ovals are the turbos efficiency dropping as you go outwards?

Another question: If a turbo makes 300ish HP on a B16 would it be capable of making the same power on a a D16? How about on a F22 or H22.

The question I am asking is that I am about to upgrade my turbo setup and I am helping two friends put together turbo setups.

I have a DSM TD04 14G that I bought without doing actual turbo research. I did tons of research on boosting, but I didn't put anythought into what turbo to get, and since it came as a kit I didn't worry about it.

I am looking to be able to make 250-300HP on a D16Z6 and my other friend is looking at 300-350HP on a F22.

I know you guys are tired of seeing the "What turbo should I get?" threads, that's why I'm asking for help on reading the maps so I can work on making my own educated decision.

Thanks guys,
Nick

edit: following is the post I read, plus the one below it in the FAQ.
https://honda-tech.com/zerothread?id=142398

 

I did a little math to see how much boost my friend would have to push in order to achieve his goals.

for 300HP he would theroetically need 13PSI.

160/14.7=300/x

160 is the stock HP number for his car and 14.7 represents atmospheric pressure. 300 is his goal and x is the unknown, which is the amount of boost necessary to reach 300HP.

Answer 27.5. 27.5-14.7 = roughly 13psi

For 350HP he would need 17.5psi.

I don't know how to convert 13 or 17.5psi into Lbs/Minute so I can compare those numbers to the compressor maps of turbos.

Am I making any sense at all or am I completely lost?

 

Bump for the morning crew.

 

to properly read the map, you need to do many calculations that take turbo efficiency numbers, intercooler efficiency numbers, numbers from your motor at many different rpm points, air temp etc...to plot points on the map to see how the turbo would work for you at those different rpm points.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike1114 &raquo;</TD></TR><TR><TD CLASS="quote">to properly read the map, you need to do many calculations that take turbo efficiency numbers, intercooler efficiency numbers, numbers from your motor at many different rpm points, air temp etc...to plot points on the map to see how the turbo would work for you at those different rpm points.</TD></TR></TABLE>

Would the only way to find what turbo I need be to ask? Or are those numbers I could get before buying/installing the turbo?

 

easiest way would be to ask...im The Shodan, he's really good at this.

You can derive the numbers but you first have to find out what calculations you need and then what numbers to plot into them.

Intercooler efficiency is hard to find out unless you buy a baller cooler like precision
turbo eff is hard unless garrett provides them somewhere

even to find some of the numbers for your motor is very hard.

I found the calculations in an old super street or something like that back in 2003, even when I did it I had to guess on some of the numbers. Sometimes you can find a program someone put together to just plot in the numbers and they usually have a guide to guess on some of the numbers.

Like for example @ 7500 rpms, my motor came up with the numbers 1.9 and 30. If you plot those numbers on that map, thats where my motor is at, at 7500rpm. But like I said, this is only one rpm point, you need many to make sure you land in the good areas of the map throughout your motors rpm range.

 

Thanks a lot man. I really appreciate the help.

I was just hoping to learn to do the math on my own so I didn't have to bug you guys with another "What turbo should I get" question.

Like the saying goes: Give a man a fish and he'll have food for a day, teach a man to fish and he'll have food forever.

 

true, I feel ya.

If I were you I would search out some threads of people who have the same motor setup as you (or close) and see what they run and what their spool times are and kinda guess from there.

This is what I did and I picked a good one. After I did the calculations later on this turbo it suited my needs pretty well.

Again, The Shodan can give you lots of help on this if you send him a message.

 

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

go here...read...learn young padawan.

This site will tell yow to read the maps and plot your stuff.

PS...this was in the forced induction FAQ

 

thats the site i used a long time ago i think... this was all that i got from it tho

didnt really know what the information was giving me

 

Ok. I'm not a genius at reading these easier but from you plots on that map, it looks like that turbo is pretty ok for your setup.

i guess ideally you'd want the line a little closer to the right side of the map than you have but that doesn't mean this turbo will not support what you want it to do.

 

yea, it was pretty close to the middle of the graph so i was like... looks ok to me...

its a garrett t3 60-1 going on a 2.0 gsr motor, so i should be straight