miata2fast

iTrader: (2)

Wanna race?

If you have all that, you will go faster if you developed the induction. My personal opinion.

I never would have run what I do currently with a stock manny and throttle body.

Braineack

iTrader: (62)

you meant this:

y8s

iTrader: (8)

individual throttle bodies plus a plenum > one throttle body in front of the plenum.

imagine having big *** ports at high rpm and teenie high velocity ports at low rpm? mmm sweeeeet.

WonTon

iTrader: (17)

Lets see if I can redeem myself! If your cruising at 3500 RPM, Thats about 58 Rotations per second, and about 116 strokes per second right? 2 strokes per rotation right? (Im rounding my numbers)

If you ask me, saying that one stroke pulling air through a 60mm TB is wrong givin the amount of air that can be pulled in the engine in ONE second depending on RPMs.

nitrodann

Your cute.

Dann

WonTon

iTrader: (17)

miata2fast

iTrader: (2)

You bring up a very good point. The throttle body in front of the plenum is what will always cause a lower pressure inside a naturally aspirated intake tract than the air outside of the intake tract.

What do Indy Car, Prostock, and Moto GP all have in common? They are all unlimmited naturally aspirated racers, and they all have one throttle body per cylinder.

The only time I have seen a single throttle body in an unlimmited application, is turbo or supercharged drag cars. I think it is because the plenum has a pressure high enough to keep one runner from robbing another, and quick throttle response in not really important.......And I spend a lot of time at the drag strip.

thirdgen

iTrader: (26)

How much time do you spend driving your car down the street? I want to know about the daily driven characteristics of a setup like this. I under stand WOT performance, but what about cruising?

miata2fast

iTrader: (2)

I have found that cruising along on the street is great. I have had no drivability problems at all. When you crack the throttle it is way more responsive than stock. If you tune it correctly, you will be amazed at how hard it accelerates with part throttle. It make the experience quite nice.

It took a while to get rid of the dead spot when I floored it, but after fiddling with it, I got it to go away.

y8s

iTrader: (8)

but still

if you could

wouldn't you?

g_reichow

iTrader: (2)

y8s, whose manifold is that? more specifically, the plenum?

-Greer

y8s

iTrader: (8)

it's a k series setup from hayward.

for a couple grand, you could have one too.

http://www.haywardperformance.com/intake_systems.php

g_reichow

iTrader: (2)

Not that much love, was hoping for a solid plenum supplier besides ross machine

-Greer

90R

iTrader: (4)

don't forget the lawyers and bean counters



MS2 should have alpha N capability TPS/crank angle tuning and the "special" ITB stetting of blended speed density / alpha N

use a vacuum block to combine the 4 shitty signals into a somewhat useable single signal.

Savington

iTrader: (31)

If you spend a LOT of time tuning runner lengths (intake and exhaust), port sizing/velocity, valve size/angle, and plenum size/design, you can get a motor with such good scavenging that it will produce positive manifold pressure. One of the S2000 motors (or both?) runs at more than 100% VE due to good tuning.

[/quoteI think that it helps alleviate the symptom tremendously, but does it truely completely eliminate it? [/quote]

Uh, yes. When the valve opens, you pull air from the plenum, which pulls from the throttle body (and now we're back to the 60mm vs. 40mm argument). The rest of the runners get the bouncing effect that Scooteroo was talking about.

Savington

iTrader: (31)

What the **** are you saying?

curly

iTrader: (25)

We're going to add to our warning system. Not only will we have a grammar warning, but now WonTon will have a math warning.

nitrodann

I really dont think you do understand WOT performance.

I agree with everything that miata2fast just said, the only thing i would like to add to this is that due to the huge intake flow area you now have, a dyno plot would show that 3/4 throttle made equal or damn near close to WOT power, and also due to this huge intake flow area it might feel like only part throttle under your foot but I bet the vacuum is like 70 kpa when you think your only at 1/4 throttle, even more-so at lower rpm.

When 90R refers to alpha-n above hes refering to tuning with just tps and map as i explained earlier just to clarify to you. This is the setting you need to set MS (or any other ECU) to to run no map sensor input.

Dann

WonTon

iTrader: (17)

I dont even know anymore.

I think what I was trying to get across is that one stroke is irrelevant to the grand picture. In one second an engine can take in more air than I can breath in a minute. Its like breathing through a straw. If you open up the airway it gets easier to pull in air.

okay, okay....no more math for me.

Atleast I think my math was right on the second try!

pusha

iTrader: (5)

I was warned for this post by curly, I believe this to be unjust. I stand by my original post and would like to add that the OP's reasons for starting this topic are retarded. You can't thread crap in a beshitted thread.

In case you missed his reasoning behind wanting ITBs:

" mean think about it. If you have a LS-1 camaro and you get beat by a turbo Miata...you'll be like, "that thing weighs 1/2 my car, and I don't have boost...let me boost my car, then we'll see who wins". However, if you beat me, but I still can hang with you, you might say, "that thing is pretty fast, but I didn't hear it blow off. What? It's Not Boosted??? That's pretty mean!"
ITB's change the whole power band. I have read that it's full throttle power from 3000-9000 RPM."