Yes, a larger throttle butterfly will give you a more sensitive accelerator pedal. In extreme cases this could make the car pretty hard to drive!
as the title states. i have a 90mm throttle body here that i was going to use on my GZE. but i have been thinking that maybe its going to be too big.
with the size that it is, when opening the throttle a little, it would be the same as opening it a lot if i were using the factory body. if you get what i mean.
by having one really big the amount of air going in on partial throttle woiuld be alot. would this cause a harsh on/off throttle down low?
ideas and inputs please?
Originally Posted by The Witzl
Yes, a larger throttle butterfly will give you a more sensitive accelerator pedal. In extreme cases this could make the car pretty hard to drive!
Norbie!
www.norbie.net
thats pretty much what i thought. i think this one is a bit big for a GZE.
i still have a holden 304 and v6 throttle body to choose from
Originally Posted by The Witzl
WTF is the 90mm throttle from?
Teh UZA80 - Project Century - Remotely p00'd by association
nissan infiniti.
i can fit my fist into it. NO BULLSHIT.
ill probably sell it now anyways.
Originally Posted by The Witzl
for a 4a-gze?!
maybe just a little overkill
from memory, upgraded JZA80s use 90-100mm throttle bodies
Like has been said, 90mm is extreme overkill for your 4A. I use a 50mm throttle in the KE20. I believe that smaller throttles offer better airspeed.
One calc that I have seen regarding throttle size is not to exceed 300ft/sec.
YelloRolla's KE20 1/4mi = 11.32 @ 119mph @ 22psi on slicks
12.44 @ 113 mph on 165 wide street tyres
210rwkw - not bad for a smelly 3TGTE running pump fuel.
You want your airflow at desired conditions to be around Mach 0.6.
Quite an interesting air speed that you've mentioned there.Originally Posted by pilot
Given that airspeed (approx 660 ft/sec) then the 4A GE will require a single T/B of around 27mm diameter (assuming 110% VE and 7000RPM). Now that's a small throttle plate.
Have I missed something?
YelloRolla's KE20 1/4mi = 11.32 @ 119mph @ 22psi on slicks
12.44 @ 113 mph on 165 wide street tyres
210rwkw - not bad for a smelly 3TGTE running pump fuel.
one way to avoid the sensitivity of a big TB is to use a guide that is in the shape of and involute.
so at idle, the distance from the pivot is high and so TB rotates slow relative to accelerator depression. then as you depress the throttle poedal more, the distance to pivot decreases
hello
...but there's only so much air that an engine can consume. I'd hazard a guess that even at full noise, you'd make the same power on 50% throttle as full throttle with something that big....
RM.
a bigger throttle body (which usually means bigger piping) will decrease air velocity at high rpm.
high air velocity means you will get a pressure drop through the piping.
pressure drop = less air entering engine = less power
hello
when i put my big t/b on my gte i had to change the way i drive as such, id have to only touch the throttle a little to vary the revs(once spinning).
a big throttle body opend a small amount is like a small t/b opend half way.
if i were to make one it would be a duel stage like the mechanical secondarys in a carby, but if for dragging bigger is better.
pressure drop = less power
more pressure = more power
more pressure more flow = more more power
i dont have a funny or cool signature.
find a TB with one of these
hello
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