My tuner has an extra intake manifold and is polishing the ports for me...anybody else have this done?

I am also looking into getting a chip from Japan...

 

someone had it done with unfavorable results.
BTW, i'm glad you found the Car Talk section.

 

hmm....do you know who had it?

 

I did it last fall. The results were not unfavorable; just indifferent.

Part 1

Part 2

Part 3

 

scalbert...did you geta chance to dyno your car before and after?

 

I was the 1st one to do it on this board. :P gains were pretty minimal unless you're going the FI route.

 

First off, yes, Mike was the first although he sent his off to be extrude honed. Read, Lazy... :P

As for before and after dyno, yes and no. I also had added the Mugen T-Stat and Fan switch. Other dynos showed that by dropping the engine temps from 200+ to the 180 F range gave about 5 - 7 lb/ft more torque. So the below really shows those gains and nothing from the polishing.

However, I should note, on the second dyno I was running a different intake which didn't amount to much over stock without the resonator. On the first dyno I was running an AEM intake.

 

As a side note on my above dyno; notice how the dips and rises don't follow at the same RPM. Both the IMRC opening and VTEC change over has to occur at the same RPM but they are offset. So I wonder if the dyno was a bit off on its mag pick up.

Anyway, I did a quick correction and shifted the blue line to have the transition points match in RPM; plus 200 RPM. I then recalculated the WHP measurement based on the new RPM and it came out to 254.4 WHP.

So maybe there was more benefit than originally thought.

 

 

dont do it i lost 15hp 17# of torque
pre dyno dynoed after same dyno

 

not from just the intake. you did your heads and everything, right john?

 

There are still some questions regarding how the shop did John's head. They say they didn't take that much off but his dyno numbers went down.
Be careful.

 

I have a ported and extrude-honed manifold... seemed to help.. .no dyno yet though!

 

Oh you brute!

I just wanted it done right...not by some hack from some where in georgia!

 

yea umm Mike takes his polishing quite seriously.

 

shaddup bean pole!

 

This is the one I was talking about Scalbert.
not you

 

It is actually southern ingenuity, or maybe it is stupidity, I can't remember which...

 

Yea

Just a bunch of InBREEDS Down Here....

So....don't come down Mess with Our "Branchless Tree"

 

there is no chip from japan, don't do it, you will be getting ripped off

 

and they did a great job the first few times around :P

 

SO, does anyone know the truth - does p/p do anthing for our engines? Has anyone tried it with s/c yet?

 

If you are not going with a 6-speed and S/C, you might want to spend you money some where else... (my $0.02)

Count-up the positive vs. negative responses above.

There is always going to be a possibility that it would "help" with a particular configuration (3.5Liter with some other upper end mods [cams, valves, porting, higher rev limit via new ECU]) or S/C combo mentioned above.


The problem with the "truth" is: the "tested" configurations are all different.

Sometimes a little roughness can actually help keep the air velocity up in the intake runners and allow for better cylinder filling.

YMMV

 

I did heads intake and vavle',s what a mistake that was .

 

If its done properlyly, it will give you gains. However, that mod has to be accompanied by other mods. Take a situation where head can flow at say.. rate X cfm, but the TB only allows 1.1X cfm. Well, if you port the heads to flow 1.3X cfm, it won't do you any good!

Also... the amount, angle(s), countours etc. of the port make a big difference on how air fills up the combustion chamber and how exhaust leaves it. Sometimes you have to alter intake cam timing to accomodate the difference in flow.