LshatchTurbo

I understand that the E trim is a bigger turbo. My question is that if I decided to run the B trim on my LS hatch, would this reduce lag? I am considering the B trim cause I doubt I would ever max its potential. Also, what are the Pros and cons for each? Thanks




[Modified by Zynentech, 3:14 AM 3/18/2002]

HXMan

^^^^

I would like to know too!

The Mick

First off, let me state the fact that I'm no guru.
I believe to reduce lag, you'd wanna concentrate more on the T3 (exhaust) side of the turbo. For quicker spooling characteristics, you'd choose an A/R .48 housing instead of a A/R .63 one. That would probably be better suited for an LS motor anyway (unless you changed the valvetrain so that you could rev higher than stock). The GS-R crowd seem to like the A/R .63 housings because they don't seem to "lose steam" in the higher rpm range like the .48 do.

Actually, it looks like the inducer/major diameters on many of the T04B are larger than the T04E ones. I think you should actually see which one is better suited to your engine by graphing them out on the compressor flow maps.
Check out this page for compressor wheel sizes:
http://www.turboneticsinc.com/catalog/comp_wheels.html

Check out this page for turbine wheels/housings:
http://www.turboneticsinc.com/catalog/twheel.html
and
http://www.turboneticsinc.com/catalog/thousing.html

Go here to compare several compressor maps:
http://www.turbocharged.com/catalog/compmaps/fig14.html

Take care,

LshatchTurbo

Yeah I am pretty new alot of the turbo tech. I notice that the Drag kits that importparts.com sell for a b18b1 hybrid civic come with the t3/t4e turbo. still learning!

The Mick

Same here... always learning!

Type-ARR

The t3/t04e is a bit bigger then the b so yes there is going to be a bit less turbo lag spooling up but its not a "big" difference. This is from comparing the B that come in a Drag kit to my E from a rev-hard kit. But the the E spools up it hits a bit harder then the B. so there are two things to think about when comparing the two.

LshatchTurbo

Around when does boost kick in with either turbo?

dbman96

Another thing to think about is that the E-series compressors are generally a few points more efficient than the B-series, so you will have slightly lower charge temp and therefore higher density using the 04E.

BlueShadow

Yes just like dbman96 said, the T04 E 60 can be 75% efficient up to 25-27 PSI (MAX), but thats in a very samll window probably about 500-1500 RPM close to redline.

while the T04B is only 74% efficient at about 16 PSI (MAX). also within a window of about 1000-1500 RPM's.

Zynentech,

when full boost hits is usually dependent on the size of the TURBINE A/R not the compressor size. The compressor size might determine lag but only to a very small extent. Also when "full boost hits" depends on how much "full boost" is.

to give you a general idea, an H22 VTEC will hit the following boost pressure at the following RPM's.

this is from Turbo Lude SH's setup
T3 (.63 a/r) T04E 60, and a ceramic BB

8 psi = 2900-3100 RPM's
10 psi = 3400 RPM's
12 psi = 3600 RPM's (He never ran 12psi specifically)
15 psi = 3900-4100 RPM's.
18 psi = Havent tried yet

for a standard BB I would just add about 700-800 RPM's to the Ceramics' RPM #'s

a bigger turbine a/r means you will hit that the same boost pressure will be hit at a higher RPM due to more lag. too big of an a/r and you might not even hit your desired boost pressure!




[Modified by BlueShadow, 9:14 AM 3/19/2002]