Thread: Turbo Charts And Best Turbos For Your Needs

Hmmm,

I know the GTiR uses a 79 trim hotside... does anyone know the large diameter of the turbine? I could go measure it, but I don't have a micrometer.

Would anyone see anything wrong with using the gtir 0.86 housing and getting it bored out to fit the bigger wheel, and just buying the turbo minus the housing. Has anyone ever done that before? Sorry if its a stupid question.

This is pretty interesting.

edit: In short, use the 3071 assembly and compressor housing w/ the 0.86 T28 housing..

^That might be an interesting combo.

forced performance mods turbine housings for dif wheels, but I do not know the extent of what they offer.
Garrett sells a t2 flanged internal gate hotside for the 84 and 90 trim 56.5mm major'd for the 3071r.

Oh, and I wish you could tell me the major of the gtir t-wheel, I have 3 trbos in my garage and am thinking of building a frankenstein, have all the specs less the gtir, and no Micrometer handy.

I guess I can go to the shop and mike it.

That sounds like the perfect upgrade for 2009/10...

As for the GTIR wheel, I'll measure it tonight, it will be rough, but I'll take the pics... I have the housing off getting ported anyway... Maybe I can get a string and find the circumference and we can calculate the radius with that. I'll post up in the morning...

...I might be getting my dranky drank on tonight

sounds like the 30r could make those power goals that you are looking to meet

im thinkin about doin a 35r and runnin 30 pounds of boost on my first passs at the track,, it might blow up but f it. its only monety..................................... drunk post^^^ dammit 3076 sounds so good but idk!!!! i guess like miko said bigger is not always better. i bought curt dragons lovefab sidewinder so i figured what the hell..... idk. itll be a month or 2 before i order a turbo so i got time to think about it.
matt

Here we go... I dont know if the way i did it is the best... but there leaves a tiny room for error, but nontheless. This is for a GTIR T28 Turbine Wheel... since I couldn't find diameter specs anywhere...

I used a zip tie and a ruler to measure instead of the string... because the string didn't exactly make a circular patter around the turbine blade... I marked where the circumference stopped, and found the radius that way. This is what I found...

http://www.sr20forum.com/forced-induction-performance-parts/164299-gtir-t28-turbo-kit.html#post1609555

But I went ahead and still posted my calculations to check it... it was a little off from what he posted, but I'd just assume what he posted since his numbers were probably from the factory or a remanufacturer or something.

Here's what I calculated...

[b]Circumference Calculated = 170.5(+/- 0.5mm)[/b]



Circumference = 2*Pi*r or Pi*d



D = 170.5mm/(3.14159265)



[COLOR="DarkRed"]D = 54.27mm = Turbine Inducer[/COLOR]







[b]T28 Turbine Trim = 79[/b]



Turbine Trim = [(Exducer^2)/(Inducer^2)]*100



0.79 = (Exducer^2)/(54.27^2)



(Exducer^2) = (2,945.23)*(0.79)



Exducer = SQRT[2326.73]



[COLOR="DarkRed"]Turbine Exducer = 48.24mm[/COLOR]





[b]Double Check Trim (Because sometimes I don't remember PEMDAS [/b]



Turbine Trim = [(48.24^2)/(54.27^2)]*100



Turbine Trim = 79.01.... yep

Thank God for Google Calculator!!!! Pictures are worth 1000 words... enjoy!

1. Measured my oh so ghetto fabulous way


2. Another Angle...


3. Marked w/ a Sharpie... which leaves for about a 0.5mm error... I marked it right in the middle of where the zip tie intersected.

lolz!

so on gt3071r .86ar is the rule of thumb? From what I've read no one has a .64ar.

just recently bought a 92 G20 any suggestions for low boost quick power?