Topic: question regardin TB spacer

[andpgud]

What would you say if I would get a stock 4L TB and a 55mm, 1" wide spacer and bore the Intake manifold to 55mm?
How would that work out for the 2.5?

[chardrc]

I Run a custom TB spacer which is 60mm top side and tapers to 55mm bottom side. Helps keep air pressurized coming in which maintains torque through out the power band. Works for me.

that would be a nozzle which would increase velocity and decrease pressure according to Bernoulli equation (simplification)

take a look at the picture on right side of the wiki link.
http://en.wikipedia.org/wiki/Bernoulli%27s_principle

you have to have the same flow rate through the entire system so when you go to a smaller diameter the velocity has to go up to maintain the flow rate.  Bernoulli equation has velocity, pressure, and gravitational potential terms, in this case (1 inch drop) gravitational potential change is quite small, so for the increase in velocity you lose pressure. 

[andpgud]

So 55mm all the way should do the job?

[FourbangerYJ]

So 55mm all the way should do the job?

It's more than the stock one so it does gain a bit of performance. The 62-64mm ones even more so.

[sharpxmen]

these are 64mm




comparison 2.5 vs. 4.0 vs. 64mm

[quicksand]

Nice 64s, do you also bore the manifold that big on a 2.5L?

[FourbangerYJ]

these are 64mm

There are rules against posting PORN PICS here.  Might have to give you a timeout! 

[sharpxmen]

Nice 64s, do you also bore the manifold that big on a 2.5L?

yep, and round the edges under the bore

There are rules against posting PORN PICS here.   Might have to give you a timeout!  

fixed, should be gone in a bit

[andpgud]

I would like to get those photos bakc :(

[FourbangerYJ]

fixed, should be gone in a bit

You know I was teasing about the Porn bit, right?    Bring em back. 

[sharpxmen]

I would like to get those photos bakc :(

You know I was teasing about the Porn bit, right?    Bring em back. 

they're back

[FourbangerYJ]

they're back

Thanks for bringing back the eye candy!     

[andpgud]

With doing the TB thing and with the spacer, do you get better MPG?

[sharpxmen]

With doing the TB thing and with the spacer, do you get better MPG?

unlikely, as you get better response and probably drive faster it might get worse. It's more about the way you drive than anything and based on how this would fit your style of driving could go either way.