Is there any proven aftermarket plenums out there?

 

Mw9 shin beats has an Interesting thread on kinetix v+ I think. I bet with that tb and cams you would see huge gains to over 7k plus

 

Its the Velocity manifold not the V+. Big difference between the two!!

 

Placed an order. Will see how it does with a Vortech, built motor, and a tune.

 

My guess is you'll lose both HP and TQ. Engine won't be able to handle the extra air flow.

 

Big Update:
















































I traded my car and cash for a built 2JZ swapped IS300 550whp@19psi pump gas

 

Sad news...

 

Awesome. Thx for helping out the Z community before you left. ........

 

I don't ever foresee anyone doing an independent dyno with just this TB as the only change. People are going to tack on other mods and/or tune then claim gains.

 

I don't care about gains before a tune. For all we know the larger throttle body is just leaning out a previously rich tune, making it look like the part is superior instead of it just altering your A/F ratio.

 

Three5 im going to have a independent dyno however wont b 4 like 2 months

 

^ Sweet. Looking forward to it.

Exactly. Who's to say that your previous tune was spot on or that your new tune won't be done better?

I'd rather have 1 variable than 2.

 

If everyone is waiting for a back to back definitive dyno, its not worth waiting for. The dyno I posted has AFR for both throttle bodies and the timing was untouched. Different days, hot/cold, this is not the silver bullet.

 

I wouldn't say I'm waiting for a back to back dyno. I was just saying I'd like to see one pop up sometime. I'm not interested in getting this so the existence of said dyno doesn't really affect me.

 

Exactly, butt dynos lie as is obvious with all the so called "reviews"

 

I'm wondering about the fact, that AFR is changing extremly lean and the gain after the tune is that less. In theorie changing a pipe diameter from 70mm to 75mm gains 30% more flow. When now the engine run lean that goes with the theorie, but the gains after tuning will not.

Interesting, what else is going wrong there.

However, even the 75mm throttle with a 3" single piping in front of is too small for that kind of engine. When you compare the cross sectional areas from the lower plenum runners to the area, what is left through the single pipe section (throttle body & intake system) even a 4" piping equals not the surfaces from the runners. Shows how restrictive the intake of the Z really is and that every opening of this pipe section should show hp gains especially with cams and higher rpm limits.

Patty

 

The intake pipe is flowing continuously, the intake runners are flowing air one at a time.

 

you're right, but under high rpm take care of the pulse frequence @ each runner surging for air. Should be near to a continuous flow.

 

Be careful not to directly correlate flow and cross-sectional area. One pipe with 10sq-in will have more mass flow per pressure drop than ten 1sq-in pipes, assuming equal lengths.

The severe leaning out of the AFR after the change is from people tuning fuel incorrectly. Basically, people are actually flowing more air, which is putting them on a new section of the MAF table. Everyone should be tuning on the fuel compensation table and not the MAF table. Tuning on the MAF table is basically turning the ECU into a giant S-AFC. Welcome back to the 90's, guys. A properly calibrated mass-flow system should have already added the appropriate amount of additional fuel to match the additional air.

 

Ding Ding Ding we have a winner!!!!


Soo as results of my tuning was from a starting point of the day 249whp with one pull. Was unsafe to do another. After a lot of fuel added it came to 262whp with the first dyno session of the day. After letting it cool and trying again. We got it up to 264whp. Let it cool again for a longer period. And tried again. Final PEAK number 267.8whp.

The tuner and shop kinda laughed at the 15whp alone. And I had to agree but a bigger carb is a bigger carb. If you know what I mean. Best $300 I ever spent... I'm talking about the tune not the Throttle Body.