70mm Big Bore Throttle Body...Major Gain Y/N?
#1
Z20 H8R
Thread Starter
Join Date: Sep 2002
Location: norman oklahoma
Posts: 325
Likes: 0
Received 0 Likes
on
0 Posts
70mm Big Bore Throttle Body...Major Gain Y/N?
Is a 70mm throttle body really all that big of a gain in performance. I have an intake manifold and exhaust so i'm sure it will give something, but how much? anyone know what i could expect? Is it worth the $400?
#5
Z20 H8R
Thread Starter
Join Date: Sep 2002
Location: norman oklahoma
Posts: 325
Likes: 0
Received 0 Likes
on
0 Posts
so 70 is more for a turbo eh? hmm where could i find a 6xmm throttle body. inline four is where i usually buy most of my stuff. also modacar but i think all they have is a 70 also. it would definately be nice to gain another 7-10 hp.
#6
Senior Member
Join Date: Jun 2002
Location: San Diego, CA
Posts: 499
Likes: 0
Received 0 Likes
on
0 Posts
You have an intake manifold? Do you mean a cold air intake? If you already have a different intake manifold on there, don't put a bigger throttle body on it. If you're going to go with a bigger throttle body, put a stock intake manifold on it. Otherwise, like people have already said, you'll reduce air velocity by too much, and lose power.
But, if you do mean you have a cold air intake already, don't go with a 70mm if you're staying naturally aspirated. By the way, how big is a stock 88-91 Si throttlebody? Anyone know? My Helm manual doesn't say.
But, if you do mean you have a cold air intake already, don't go with a 70mm if you're staying naturally aspirated. By the way, how big is a stock 88-91 Si throttlebody? Anyone know? My Helm manual doesn't say.
#7
Z20 H8R
Thread Starter
Join Date: Sep 2002
Location: norman oklahoma
Posts: 325
Likes: 0
Received 0 Likes
on
0 Posts
yeah i got a skunk2 intake manifold. actual manifold nto just ram aim intake. do you think a 62mm or something would be alright? or would that still be too much air? anyone know the stock size on a b16's throttle body?
#8
Senior Member
Join Date: Jun 2002
Location: San Diego, CA
Posts: 499
Likes: 0
Received 0 Likes
on
0 Posts
Since you already have an aftermarket intake manifold on the car, you don't wanna go more than maybe 2 or 3mm oversize with the throttlebody. Honestly, if you're staying naturally aspirated, your best bet is to get rid of that SkunkJunk manifold, put on a D16Y8 (96+ SOHC VTEC) intake manifold, and then use an oversize throttlebody. The Y8 manifold is said to be the best-flowing SOHC manifold that Honda's made yet. You'll get much better gains off of that combination. With that Skunk piece, the engine is already losing a lot of air velocity. Enlarging the throttlebody will make it lose more.
#10
Senior Member
Join Date: Mar 2002
Location: Atlanta, GA
Posts: 185
Likes: 0
Received 0 Likes
on
0 Posts
An aftermarket TB is completely useless on a honda engine, unless you're running F/I or a high compression N/A engine, wherein the extra air is needed. The same applies to aftermarket intake manifolds. The reason being is that Honda develops there engines extremely well from factory. Thats why an aftermarket exhaust will only give most honda's a couple horsepower, where an aftermarket exhaust can give a mustang 20 hp. (most domestic cars are really just slapped together, thats why performance parts give them so much HP.)
On most B series engines, an aftermarket 62mm TB freed approx. 1 hp. And most aftermarket intake manifolds lost HP. Now keep in mind that these where on stock engines with just the basic mods. (CAI, exhaust). These parts were not designed to be more efficient on a stock engine, these parts were created for built engines, engines with F/I or a High compression N/A motor.
So there you go. Keep your stock TB and save up for a turbo or something more usefull.
On most B series engines, an aftermarket 62mm TB freed approx. 1 hp. And most aftermarket intake manifolds lost HP. Now keep in mind that these where on stock engines with just the basic mods. (CAI, exhaust). These parts were not designed to be more efficient on a stock engine, these parts were created for built engines, engines with F/I or a High compression N/A motor.
So there you go. Keep your stock TB and save up for a turbo or something more usefull.