Times/HP numbers on a 2g throttle body

[19BLACKGST98]

I was curious what the limit of a stock 2g throttle body is? I know that most people at least upgrade to a 1g throttle body but who out there is still pushing their 2g throttle body?

Please post track times or dyno numbers if you have them.

 

[19BLACKGST98]

The 1g TB is an almost direct bolt on upgrade for 2g's. Almost in this case means it will bolt right on, but the opening on the IM needs to be ported.

I am aware of the upgrade/benefit of the 1g throttle body. I actually have a 75mm TB on my GST. I am just curious how far people have gone with a 2G TB since I have a stock 97 GSX. If a 2G TB will meet my goal then their is no reason for me to spend money on a 1g TB and port work. Thanks for the reply though.

 

[Imback]

i made 501 on a stock 2g tb

 

[19BLACKGST98]

i made 501 on a stock 2g tb

Those are good numbers. Was that attached to a 1g intake manifold on a 1g head or were those 2g components on that dyno run?

Thanks for the reply.

 

[99gst_racer]

I did 403/348 on the stock 2G TB. That was also with the stock 2G intake manifold and cams.

 

[jpmxrider489]

I did 403/348 on the stock 2G TB. That was also with the stock 2G intake manifold and cams.

What turbo was that on?

 

[99gst_racer]

Turbonetics 50-trim with a .63 A/R T3 housing.

 

[19BLACKGST98]

I guess I can add to my own thread since the info may help other.
I have made 402whp on an FP3052 on FP's dyno back when they had one. I was using the stock 2g TB, stock intake manifold and FP2 cams. That wasn't really pushing it but that will add to the info.

 

[Imback]

That was on a 1g manifold.

 

[mattasi]

On a dynojet, I am 400awhp-323tq on stock 2g TB. Check my profile for more info on my set-up.

 

[jpmxrider489]

Seems like people haven't made past 450.

 

[jjrock5]

Seems like people haven't made past 450.

Didn't Imback say he made 501?

 

[19BLACKGST98]

i made 501 on a stock 2g tb

Yes he did. I wonder if the throttle body was the limiting factor or something else.

 

[99gst_racer]

I don't think 450 or 500 is any limiting number for that throttle body. I'm sure it's some sort of restriction at that point, but it can be overcome.

Had I had a SMIM and some cams, I'm pretty sure I would have been around 470-480 no problem. And a bigger turbo would have been even more power yet.

 

[Boosted98gsx]

There really is no "limit" to the HP you can make through an airflow impedance, it's just going to take more boost to make more power since it's a compressible fluid (that is, until you hit the speed of sound).

 

[19BLACKGST98]

There really is no "limit" to the HP you can make through an airflow impedance, it's just going to take more boost to make more power since it's a compressible fluid (that is, until you hit the speed of sound).

Then the question is when will the 2g throttle body be the cause of the air flow reaching above mach .4?

 

[Boosted98gsx]

Then the question is when will the 2g throttle body be the cause of the air flow reaching above mach .4?

If you can afford a turbo that can make airflow that fast at that high of boost levels, you aren't going to still be using the 2g TB

 

[19BLACKGST98]

If you can afford a turbo that can make airflow that fast at that high of boost levels, you aren't going to still be using the 2g TB

The smaller the diameter the faster the air will move. Does anyone know the internal diameter of the 2g throttle body off the top of their head?
Edit: its ID is 52mm or 2.05"

So it forces the velocity above .4 mach at around 585 cfm worth of flow. Obviously you can make power after that but I read that anything above that becomes turbulent.

 

[kidtsi]

547.3AWHP stock manifold too.

 

[estoyaqui30]

52 mm for a stock 2G TB.