BoOsTeD_eK

Hey..almost done putting my setup together...and I am on the final stages..I am doing a custom kit...and I am need to pick a turbocharger. I dont understand what I am suppose to get and what all the numbers, trims, stages all mean. I have a built b16a...fully built everythign but sleeving...Upgraded fuel...big Greddy Intercooler...and oh yeah c/r of 8.5:1 I know I want t3/t4 because I know that most honda kits come with that turbo. Does anyone know any sites where I can read up on actual turbine stuff. Also what do you guys think of this turbo?
http://www.mjmturbos.com/Super60.htm


[Modified by BoOsTeD_eK, 8:02 PM 6/7/2002]

int3gra

BoOsTeD_eK

lol...that was funny.

BoOsTeD_eK

NOBODY can help me? I thought this was a turbo forum.

vtecvoodoo

uhhhhhh maybe it`s the thread title?!? um yah.

93LSivic

Do a search on flow maps, compressor map charts, or the like. That is the only way to determine what turbo is best for you. You need to understand how to read a compressor map.

ion_four

Look in the newest issue of SCC they have an article on picking a turbo, without math...it totally depends on what kind of boost your gonna run. I've got a stock bottom end and it's going to be 95% on the street, so I'm just using a T25 for 5-7psi and little lag. If I had your engine I'd probably go with the T3/T4, though I'm not sure about the different trim levels or whatever...just call up some speedshop and let em know you're gonna drop the big-bucks, they'll help ya out.

intekragsr

HOW-TO-READ A COMPRESSOR MAP

using a map of a T04E 60 trim I will explain all the numbers on the map

1-left side, PRESSURE RATIO
(14.7 + amount of boost) / 14.7 = PR
so to figure out the PR for 8 PSI
(14.7 + 8) / 14.7 = 1.54 PR


2-bottom side, AIRFLOW RATE UNDER BOOST (LB/MIN on this map)
Most methods of calculation your engine's airflow rate will give you the answer in cubic feet per minute (CFM). However most compressor maps measure airflow rate in pounds per minute (LB/MIN). As some of you may know the weight of air varies with the temperature. To convert CFM to LB/MIN use the following numbers.
@ 48 degrees F : (CFM * 0.078125) = LB/MIN
@112 degrees F : (CFM * 0.070318) = LB/MIN
@175 degrees F : (CFM * 0.06251) = LB/MIN

Say for example our airflow rate is 500 CFM , and the temperature is 112 degrees F.
(500 * 0.070318) = 35.16 LB/MIN


3-dotted line on far left side of "ovals", SURGE LIMIT
It is important to try and keep yourself on the right side of this dotted line whenever possible. If you fall to the left of this dotted line you will experience compressor surge. This type of compressor surge will occur when there is too much boost, but not enough airflow through the system, usually this is between idle and the point at which full boost is reached. The chirping sound that can be heard is a result of the oscillating air. This sound is often described as a "Snakelike" sound or a che-che-che sound.


4-numbers on far right, 46,020, 69,640, 83,972 etc, COMPRESSOR RPM
This is RPM at which the compressor fans will be turning. an average RPM is between 90,000 and 130,000. The line that branches out from each of these numbers that goes towards the surge limit line shows you the RPM range across the entire compressor map.


5-78%,75%, 74%, COMPRESSOR EFFICIENCY
This is related to the temp of air and how much it is being heated up as it is being compressed by the compressor. A low number (60%) means that the compressor is heating the air more a high number (78%) means the air is not heated as much when it is compressed. If there was such a thing as a compressor with 100% efficiency then the air would not be heated up at all.


6-"Ovals"
I you look closely you will see that the compressor efficiency numbers usually sit right on top of one of these Oval lines. These Ovals show you the boundaries of the compressor efficiency at the different percentiles. Think of it as a topography map that shows you different elevations or changes in elevations. The innermost Oval on the sample T04 E 60" is not labeleb but it is probably 79% or 80%, so any where inside that Oval and you would be operating in the 80% range of that compressor.



--changed # 1 (pressure ratios) 29 Mar
--changed # 2 (airflow rate) 29 Mar


COURTESY OF BLUESHADOW

BoOsTeD_eK

intekragsr

Thanks for taking out 3 minutes of your time to provide me with this info...so I am figuring once i figure out air flow for my engine then i will be able to match it to turbo using the compressor map....sounds good to me...still have faith in this forum.