R@mon

i recently came upon a k26 and i was wondering if it was too small for a h series motor. the turbo is like brand new, no play in the shaft whatsoever.
i researched it abit and found this map:sorry bout the bad pic

the probelm is that i dont know how to read them can some one tell me if it is efficient for 8 pounds of boost?


[Modified by 93h22a4, 6:47 PM 11/1/2002]

gtfourmn

Have u consider a different turbo... just get a t3 or something... the spool very qucik.

SiRkid

ack, according to that map it looks too small

R@mon

the thing is i already have this turbo and i didnt pay for it
someone owed me some money and gave it to me. my question is this. the blitz kit they sell for the b16 uses this same turbo and i also saw some other people who would upgrade this turbo with a k27 or bigger compressor side. i was thinking about just doing that if anything. i think the turb would work "ok" for now at least.i just dont want to get rid of it so quick because it like brand new....

Charles B.

i also have a k26. just like your average t3, there are different variations of the k26 so the one you have probably won't have the same sepecifications as the k26 on the blitz b16 kit. other than the blitz kit, i have yet to see anyone use a k26 on their honda. not only that, but you will probably need a custom mani. to fit the turbo. ill probably end up using mine for a later project....like a dual-ZC or some SOHC engine, but i would have to say its too small for your h22. hth.

Rembrant Q. Einstein

Assuming the y axis is pressure ratio and the x axis is cubic meters per second, you have to put it in numbers you are familiar with to understand it.

Pressure ratio is another way of saying how much boost you are running.
Pressure ratio is [14.7+(your boost)] divided by 14.7. In your case, 14.7+8=22.7, divide by 14.7=1.54. Pressure ratio=1.54.

Next is going from cubic meters per second to cubic feet per minute. One meter is 3.28 feet, so 3.28 x 3.28 x 3.28=35.3 cubic feet, per second. Per minute is what we are familiar with, so x60 gives cubic feet per minute. 35.3 x 60=2118. That means 2118 cubic feet per minute with the cubic meters per second at one, instead of the decimals like the graph.

Those ovalish shapes are ranges of efficiency. The further toward the "center" they are, the more efficient the compressor is, which means it heats the air less, which means more air density and power in that optimum boost range.

We already know you want to run a 1.54 pressure ratio, so now we need the cfm of your engine. This is a less precise calculation, because you have to estimate volumetric efficiency in a certain range.
Airflow rate= [cubic inches x rpm x 0.5 x volumetric efficiency] divided by 1728.

H series, lets assume H22a. ~2.2 liters = 134 ci. Revs to 8000. 0.5 does not change unless you have a 2 stroke. Let's pretend volumetric efficiency is 92%, so you put it as a decimal of 0.92. If it were 100%, it would be a 1.00. 1728 is 12 x 12 x 12, which represents the cubic inches in one cubic foot.

So [134 x 8000 x 0.5 x 0.92] / 1728 = 285 cfm.

Where the cubic meters per second and pressure ratio intersect on that graph represents the efficiency range the turbo will operate in on that engine.

I recommend using a conventional, proven turbo like the T3/T4 types. The K type turbos are cool, but you will never find yourself saying "yeah I really feel that 2% compressor efficiency difference over those Garrett turbos at my same pressure ratio and airflow rate for my particular setup, I am so glad."

Those who have done these calculations more than me feel free to check my math as it came from my sleep deprived mind and may have holes in it as it got punched in the keyboard.

R@mon

damn i really gota learn how to do that..

i have been searching for info and i found a couple site that run these turbos on audis and porsche and old school bmw's and some of the motors are bigger than mine.
for instance the audi is a 5 cylinder 2.something liter and the bmw was a 2.5 liter...

if i decided to go with the trubo finally what kind of hp could i expect from it? i dont have 300hp+ at the wheels but would be happy with something like 230-260

Rembrant Q. Einstein

I hate estimating horsepower, but I need to know your whole setup. All I know is 8 lbs in a H22 with a K26.

Look at point where the 1.54 pressure ratio (y axis) and 0.13 cubic meters/second (x axis) intersect. It will be right in the maximum efficiency of the turbo, 76%.

This turbo should be fine for your power goals. But I need to know the whole setup.

R@mon

it would be a h22a4 runnign a stock block except for maybe a lower compresion headgasket and a full three inch exhaust. fuel managment would be a afc hack and a intank fuel pump. it would have a deltagate and a hks bov. with homemade piping and a log style exhaust manifold....

DevilSolSi

i believe porsche used a k26 turbo on their 944 turbo line....those were 2.5 liter 4cylinder engines....and stock puttin out about 250hp...granted these are completely different cars and motors but u get the idea that taht turbo should be able to make the power..i guess teh trim of the rubo would make a differance as well tho

R@mon

thats exactly what i was just thinking. there are alot of audi/porsche/bmw site that use this turbo and i could always upgrade it to a k27 compressor side to make it flow better....check this out...
http://www.034efi.com/Hybrid_turbos.html
and this
http://www.tt-forum.co.uk/product/page17.html
and this
http://www.elektro.com/~audi/s6q95/

DevilSolSi

that audi s6 is a ****** sleeper if ive ever seen one.....

by the way....wat manifold are u planning on using? does anyone make one that will fit that turbo?


[Modified by DevilSolSi, 1:30 PM 11/3/2002]

R@mon

my dad is a welding instructor at a technical school so he i going to make me my manifold. and he might have to have a freind make the turbo flang.

Rembrant Q. Einstein

yes, that should be enough for the power you want.

R@mon

on more question. up to what psi would this turbo still be efficient? again thanx alot..