malfuncion

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?

ISP James

i think i heard 7-12 hp is average for most t-body's but 70mm is pretty big so hard to say.... id say its worth it, more airflow = good :thumbup:

FourthGenHatch

70 is a little big unless you have a Turbo. I think like 62mm would be better.

ZiviCase10287

yes 70 is too big, i've also heard of people actually gaining 1 hp and losing like 8 ft/tq vice versa. i wouldn't do it

malfuncion

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.

AwwsChwA

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.

malfuncion

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?

AwwsChwA

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.

malfuncion

i have a b16a1....

`;o)

cwhiteboy

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.