Q45 TB

Aspec

Supra uber alles
Dec 22, 2005
261
0
0
Surprise, AZ
What your Supra brothers are trying to say is that there are 50-100 things your car needs, wants and desires before it is even close to time for a Q45 tb.

If your current modification level is not what we assume please enlighten us.
 

7M-fanatic

Banned
Apr 21, 2006
95
0
0
San Antonio, TX
BBK 70mm on modified NA manifold works well.
The Q45 job looks cool.
But unless you have 80mm piping, an intercooler with 80mm inlet & outlet, and a T88 or larger turbo, it is a waste.
Any one item on the whole system that isn't 80mm, becomes the throttle.
What good is an 80mm throttle if you only have 70mm or smaller piping.
Not much !
There are many high HP 7Ms out there just using the stock throttle.
 

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QWIKSTRIKE

475rwhp459torq an climbin
Apr 3, 2005
1,172
0
36
63
Some where out there
www.cardomain.com
7M-fanatic said:
BBK 70mm on modified NA manifold works well.
The Q45 job looks cool.
But unless you have 80mm piping, an intercooler with 80mm inlet & outlet, and a T88 or larger turbo, it is a waste.
Any one item on the whole system that isn't 80mm, becomes the throttle.
What good is an 80mm throttle if you only have 70mm or smaller piping.
Not much !
There are many high HP 7Ms out there just using the stock throttle.


Thats a litlle inaccurate I don't have a t88 and it runs fine with my GT4067R
 

dbsupra90

toonar
Apr 1, 2005
2,374
0
0
indiucky
just thought id add-

almost all the aftermarket t'bodies will whistle. its air rushing past the throttle shaft. some do it more than others. a stock tb like a q45 is whisper quiet.
 

starscream5000

Senior VIP Member
Aug 23, 2006
6,359
0
36
Hot and Humid, KY
7M-fanatic said:
What good is an 80mm throttle if you only have 70mm or smaller piping.
Not much !


Wrong. The throttle body should be around (or at least) 1/2" larger in diameter than the smallest piping in your intake tract (and try to keep all of that the same diameter). A TB doesn't flow like a straight through pipe due to the TB plate. 70mm piping with a 80mm is almost optimum, but I'd go with 85mm to be close to the 1/2" larger.
 

arz

Arizona Performance
Nov 14, 2005
955
0
0
Mesa, AZ
www.ArizonaPerformance.com
After the exit immediately out of the turbo every ounce of my plumbing is 3 inches in diameter. EXCEPT the thottle body, and Im not ready for a throttle body yet. Its just not that much of a bottle neck.

starscream5000 said:
Wrong. The throttle body should be around (or at least) 1/2" larger in diameter than the smallest piping in your intake tract
That might be the case with NA plumbing, but a lot of little things can be overcome by just one more psi.