Well, since jackmehoff hasnt posted, im assuming your talking to me

if your talking about the volumetric efficientcy equation posted on the faq of another neon site, realize that equation is several SEVERAL years old and is based for carburated cars that do not have the ability to change a fuel map. my dad was using that equation when he built his 11 second chevy vega back in the late 70s

my 1/4 mile times dropped, my acceleration improved from idle on up, all with just a change from 52mm to 60mm. I'm sorry that im not gonna dyno the 2 side by side because i dont feel its worth $100 to prove something thats already been proven with my 1/4 mile times. If any other people want to settle this once and for all, ill be more then willing to have it dyno'd with all 3 throttle bodys, but im not gonna cover the whole cost just to prove something

this happens in motocross all the time

a rider will come in and complain that a pipe gave them a lot more top end but no more low or that they last low end

then there shown a dyno graph that shows that yes, the biggest gain was up top, but that there was still a low RPM gain

its funny how the human body will notice the big improvements so much that it ignores the smaller ones

the 60mm compared to the 52mm throttle body comes on real hard at 3500 RPM, but even off idle till 3500 its much more responsive and torque-y

 

There is absolutely no need for a 60mm TB, dont listen to that guy. Def. not worth $230. There is a point will you will be doing nothing for your engine, for some reason, people believe that more air, more spark, and more fuel= more power. Thats only true if you do all of those together, not one by one.

 

only dyno sheets could tell for sure. it is possible to go over 100% vol effieicntcy

 

100% agreed.

There is no point of the 60mm TB on a stock plastic manifold. The $230 could be better spent somewhere else.

 

not to disrespect you das, because i know your very knowledgeable, and i dont mean to disrespect anything else, but your giving information on a part that i have used and can, if need be, be dyno tested and prove 100% that it does add power over the alternative part your suggesting

just a question, have any of you actually gone from a 49 to a 52 to a 60 on the car hes talking about, with the mods in that price range, or are you answering based on what people have "said" or theorys

all theorys and hearsay aside, i did each part of my engine part by part so that i knew whether each part could stand on there own, that is the best way to do bolt on modifications that way if something starts malfunctioning after a part was installed, you only had to look at one part and not 10

here are my mods in the order i put them on

1 - removed ac/ps and put on unorthodox racing udp - mild differance in power, more willing to rev than before

2 - pacesetter header and glasspack - put the header on one night, noticed a slight diff, but was being held up by the stock muffler, got my downpipe welded and a glasspack added exiting on the drivers side, big difference, allowed the header to be used to its potential

3 - CAI and 52mm ATX throttle body, i changed the spring and throttle cable cam over from the MTX throttle body to keep the same pedal feel, very nice difference, breathes a lot better and really changed the tone of the exhaust

4 - 60mm MPx throttle body - bought this one because of a lack of MTX throttle bodys at local junkyards, i wanted the cam to put on my other cars ATX throttle body because that car is being changed to a MTX, and the car i put the 60mm throttle body on is going DOHC and turbo soon, i bought this throttle body expecting to not gain much or anything - BIG SURPRISE, from the 52mm throttle body to this one is as big a differance as the 52mm and cai were from the stock throttle body and intake, from 2000 rpm up it had more snap and from 3500 rpm up it really came on hard, i did port out the plastic intake mani to match

 

it doesnt have to do with the amount of air coming through as much as it does velocity, a smaller throttle body has a faster jet of air coming through then a larger throttle body for the same engine