Polished intake manifold...
#1
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Polished intake manifold...
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...
I am also looking into getting a chip from Japan...
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Originally posted by Hobes
scalbert...did you geta chance to dyno your car before and after?
scalbert...did you geta chance to dyno your car before and after?
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.
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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.
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.
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#11
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not from just the intake. you did your heads and everything, right john?
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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.
Be careful.
#14
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Originally posted by scalbert
First off, yes, Mike was the first although he sent his off to be extrude honed. Read, Lazy... :P
First off, yes, Mike was the first although he sent his off to be extrude honed. Read, Lazy... :P
I just wanted it done right...not by some hack from some where in georgia!
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Originally posted by johntypes
dont do it i lost 15hp 17# of torque
pre dyno dynoed after same dyno
dont do it i lost 15hp 17# of torque
pre dyno dynoed after same dyno
not you
#18
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Originally posted by Mike
Oh you brute!
I just wanted it done right...not by some hack from some where in georgia!
Oh you brute!
I just wanted it done right...not by some hack from some where in georgia!
It is actually southern ingenuity, or maybe it is stupidity, I can't remember which...
#20
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Re: Polished intake manifold...
Originally posted by Hobes
I am also looking into getting a chip from Japan...
I am also looking into getting a chip from Japan...
there is no chip from japan, don't do it, you will be getting ripped off
#21
teh Senior Instigator
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Originally posted by Mike
Oh you brute!
I just wanted it done right...not by some hack from some where in georgia!
Oh you brute!
I just wanted it done right...not by some hack from some where in georgia!
and they did a great job the first few times around :P
#23
Suzuka Master
Re: Port n polish
Originally posted by Daniel M CL/TL
SO, does anyone know the truth - does p/p do anthing for our engines? Has anyone tried it with s/c yet?
SO, does anyone know the truth - does p/p do anthing for our engines? Has anyone tried it with s/c yet?
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
#25
Safety Car
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.
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.
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