I have ordered T4B S 50 Trim Compressor / T3 .48 A/R Stage 3 Wheel.
A mistake was made and I got a larger turbine, T4B S 50 Trim Compressor / T3 .63 A/R Stage 3 Wheel

I'm about to send it back, but can I use .63 A/R - would that be too much? I only plan to run 4.5-5psi on b18c5 motor...


**Based on formulas, ideal size should be .48... but then, in real life, it could be different. Please help

 

i have a diff turbo , but i have the garret t3/04e 60 trim , stage 3 wheel and .63 hot side, its on the laggy side kinda , but not bad, but still breates great on the top end. . . . og yea i have an ITR too

 

where did you order it from..?? tell them to send you the correct one.!! that shouldnt be hard. the .63 should be good with a hi comp turbo set.what are you using it for..?

 

I'm using a T3/To4b with .63 trim compressor and .48 turbine. It should be ok for what you are going to need! 5-6 psi

 

as far as sending it back, it has been resolved - they will fix it, i'm about to send it back, i just wanted to know if i could use that turbo.

from my previous post"

this A/R formula I used suggest .48 A/R https://honda-tech.com/zerothread?id=153810

below is my post:

"example:
http://64.225.76.178/catalog/comp_wheels.html - compressor sides
http://64.225.76.178/catalog/twheel.html - turbine side
http://64.225.76.178/catalog/thousing.html - turbine side


heres my turbocharger - T3/T04B S:

Specs for compressor: 1.904" - inducer, 2.750" - exducer - it says major but i guess its the same thing

(1.904 x 1.904) / (2.750 x 2.750) / 100 = 47.93 for turbine size"


I just want to have the best turbo trim for 4.5-5psi i'm going to run. Stock motor. I'd rather upgrade later than suffer with larger turbine.

 

the flaw i might see with that calculation, is that it might not consider if its T4 or T3 turbo, so if it calculates .48 turbine based on T4 compressor,


for turbine housing, would .48 A/R turbine for T4 be larger than .48 A/R T3?

 

o.k.... based on wheel sizes, it must not be the same http://64.225.76.178/catalog/twheel.html

 

what should i do? keep it or replace with .48 stage 2

 

ttt

 

If you're running stock compression, I'd keep the .63 a/r housing with the stage 3 wheel. The .63 a/r housing will shift your powerband up (in power and in the RPM range).

The B18C5 can really breathe and rev high, too.

Sonny

 

thanks

any other opions? unfortunatelly, i don't have much time to decide

 

ehmm.. nevermind.. turns out i got completely wrong trim.. its t04E... i'm sending it back... thanks for everyone help

 

This is what they sent you:

.63 a/r exhaust turbine
Stage III turbine wheel
?? a/r T04E compressor housing
50 trim T04E compressor wheel

?

Man, that doesn't sound like a bad fit for your engine. The 50 trim T04E compressor wheel flows quite a bit more than the S trim T04B wheel.

Do you not want the T04E because of space requirements?

Sonny

 

i wanted to go with t04B S based on compression maps, and .48 a/r stage 2 seems more fit for T04B S and low psi level boost i'm going to run. 4.5-5 psi

and yes, altough the sticker say T04B 50, i was told its T04E 50

space would be the least concern.. mostly i'm concerned about efficiency, it seems i would get better results with smaller turbo, on compression maps, i wasn't hitting much lower % with anything other than T04B S or nearby compressors. but i guess its different in real life..

i understand that type r engine/high compression is a plus, but will i still get best result with low boost?


[Modified by vtec.dc2, 8:26 PM 1/30/2003]

 

a to4s is pretty big...

 

Man, be careful with your terminology there...you're talking about the T04B S trim compressor wheel, right? In a couple of places, you typed T04S wheel which is the monster known as the 60-1 compressor.

.48 a/r turbines are usually "reserved" for people running a stock bore B16A or a D series engine. Almost all of the B series VTEC engines are running .63 a/r housings. Since you're running stock compression, you could spool that turbo pretty fast.

Sonny

 

sorry.. i edited the mistakes...

what you're saying makes sence.. one thing is theory and calculations, another thing is in real life, and many people use .63 with lower compression engines.. now it got me thinking again on what to do...