throttle boby mods
#11
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Originally Posted by BlownChevy
I question the ported tb gains. I do not see how something that you are not increasing the ID size of can show any gains. "Smoothing" or "Polishing" of a factory TB is useless until proven other wise (in a controlled enviornment).
In back to back magazine dyno tests, they were proven to make power without any other changes. I know magazine dyno tests can't be compared to your own local dyno, but in back to back to back tests, with documented changes, the gains are measureable.
#14
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Originally Posted by BlownChevy
I challange any of the well known TB porting companies to send me a Ported TB, I will test it back to back in a controlled enviornment. If I see claimed gains, I will personally purchase the TB and report the findings.
#16
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BTW, here's the "math" of just the throttle bar removal...
70mm TB = Pi*R squared = 3846.5 mm - the throttle bar of say 10mm by 70mm = 700mm blocked (Our throttle shaft is a few mm larger than 10 too). You end up with approx 3146.5mm of cross sectional flow area. Remove half of the bar (again, using 5mm to make the math easy) you end up with 3496.5 of cross sectional flow area, a gain of almost 10% in flow area.
Add in the smoothing of the bore entrance, the filling and smoothing of the valve cover vent tube hole (in DBW throttle bodies anyway), and the smoothing of the EGR/part throttle tumble lip, and you will notice the difference on a flow bench or dyno (or in my case, by getting repeated 1-2 MPG increase on the same highway trips. I even took it off for several weeks to verify...).
70mm TB = Pi*R squared = 3846.5 mm - the throttle bar of say 10mm by 70mm = 700mm blocked (Our throttle shaft is a few mm larger than 10 too). You end up with approx 3146.5mm of cross sectional flow area. Remove half of the bar (again, using 5mm to make the math easy) you end up with 3496.5 of cross sectional flow area, a gain of almost 10% in flow area.
Add in the smoothing of the bore entrance, the filling and smoothing of the valve cover vent tube hole (in DBW throttle bodies anyway), and the smoothing of the EGR/part throttle tumble lip, and you will notice the difference on a flow bench or dyno (or in my case, by getting repeated 1-2 MPG increase on the same highway trips. I even took it off for several weeks to verify...).
#18
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PM sent. Stock vehicle may not see as much as modded, but if we see anything it will put this in a positive light. I've been doing this for 7 years (10 years prior to that doing the same thing to carbs) and I've yet to see one vehicle not gain anything...
BTW, I can't use the early style DBW throttle bodies as cores yet as I don't have one to modify. If you have that kind, I'll need your TB before hand to modify...
BTW, I can't use the early style DBW throttle bodies as cores yet as I don't have one to modify. If you have that kind, I'll need your TB before hand to modify...
#20
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Originally Posted by SS_bnoon_SS
PM sent. Stock vehicle may not see as much as modded, but if we see anything it will put this in a positive light. I've been doing this for 7 years (10 years prior to that doing the same thing to carbs) and I've yet to see one vehicle not gain anything...
So a stock vehicle will gain less than 1-2 RWHP?