Porting the stock 3V intake?

[RED09GT]

I found one thread referencing this that didn't have much info.
Anyone else tried it? My manifold is shifted almost 1/4" between where the lower runners are attached to the upper part of the intake, (a big restriction on the roof of one bank and the floor on the opposite bank). So far, I've smoothed the shift out and I've done some work on the throttle body opening as well. Anyone else try this? There are several areas where I think there is definite room for improvement-and I figure that if I screw it up, I'll just buy an aftermarket intake to replace it.
Thoughts?

 

[whoapony]

Hmm, I'll be watching this one! I just ordered a used intake to make my own CMDP, maybe I'll see how that one is lined up and try it as well. I would think anything to prevent turbulent air would help!

 

[JeremyH]

I know one of the all out na guys on here ported a stock 3v intake awhile back. Well not so much as porting, as it is sanding/smoothing lol. He even removed the vertical split in the manifold where the tb attaches. Its an old thread I i will see if I can dig it up.

 

[95ragtop]

Contact jdm III, I am pretty sure he did this on his yellow n/a build.

 

[06gtmustang]

i just did this to my intake and i did some work on the tb opening to fit a gt500 tb without the spacer. The bad thing is that i cant compare 1/4 mile times since i already have more mods since my last run and will have even more when april comes "firebird raceway opens then". I def think it will help but it was a pain and time consuming.

 

[RED09GT]

I've got nothing better to do so I'm grinding away at mine. My car will have too many other changes as well by the time the track opens to get a good comparison. The one 2V plenum i did picked up a solid MPH in back to back passes and my GT-40 iron heads on my fox made 290 rwhp with an E303 cam, performer RPM intake, shortys, and a stock shortblock.

 

[Matt D]

I got my stock intake ported back like 2 years ago with no gain.....

 

[06gtmustang]

Yup i remember reading that thread and it kinda sucks doing something others have had no gains with but i guess results can be a little different from car to car.

 

[Matt D]

Yup i remember reading that thread and it kinda sucks doing something others have had no gains with but i guess results can be a little different from car to car.

Your right on that man Im the same way. If it gained nothing on someone elses car I try it anyway.

I was just giving you guys the heads up on what I got out of it, But it can't hurt to do it that's for sure

 

[RED09GT]

I got my stock intake ported back like 2 years ago with no gain.....

I wonder how it would do with the stage 3 heads...
From C&L's #'s it seems that the stock intake can outflow the stock heads. Anyways, I'm out 3 cartridge rolls and the time it took got me out into the garage and away from the inlaws...

 

[06gtmustang]

Im about 1100 miles away from mine so i dont have that problem hahaha

 

[BruceH]

Bringing this one back. I'm thinking of porting a stock intake to use a GT500 throttle body and cleaning up the glued together transitions. They stick out about .2" all the way around.

Also wondering if the 09 intake is molded with one piece?

Has anyone else done this since this thread was last posted in? Any data to share?

 

[JeremyH]

No point it seems Bruce. But yes the 09-10 style that uses delete plugs is one piece iirc not 100% sure been awhile since I have had one in my hands. Why not throw on a frpp manifold to compliment your heads and cams? Proven gains and they show up for great deals in the classifieds from time to time. Take some of that money after you sell the blower kit and get a nice 62mm tb as well if your trying to squeeze everything out staying na from that motor.

 

[BruceH]

No point it seems Bruce. But yes the 09-10 style that uses delete plugs is one piece iirc not 100% sure been awhile since I have had one in my hands. Why not throw on a frpp manifold to compliment your heads and cams? Proven gains and they show up for great deals in the classifieds from time to time. Take some of that money after you sell the blower kit and get a nice 62mm tb as well if your trying to squeeze everything out staying na from that motor.

When it was na last time I had the frpp intake and frpp 62mm tb. Made 437rwhp na.

I was wondering if the main difference was the intake or tb. Previous na motors of mine only lost torque when the frpp intake was used but they were all based on stock bore. With the 3.7" Big Bore a number of things are helping. I think the biggest is unshrouding the valves which allows more air to flow freely.

I ran the BB with the stock intake and frpp. Datalogs showed a significant airflow increase in the higher rpms. However, I'm not sure if it was because of the 62mm tb, frpp intake, or a combination of both.

Currently doing some research that is showing my biggest restriction was the stock 55mm tb. At 875cfm it's choking the airflow to the motor. This is why I'm taking a second look at the stock intake and seeing if there are any restrictions there.

 

[JeremyH]

SO hard to keep track of your setups! lol Cant speak for a na car, but I had a 62mm tb with stock intake and swapped to frpp manifold with same 62mm tb and picked up 35rwhp at 12psi with a turbo no other changes and manifold was swapped same day on the dyno. Cant tell you what that would equate to na. But when a larger tb swap alone only make 1-3rwhp na, I would assume the mainfold is definetly part of that equation.

Pull up MattD's old testing he was the first one to get a frpp manifold and he previously has a ported stock manifold that netted zero gains. I know he posted his results a logn time ago.

 

[BruceH]

SO hard to keep track of your setups! lol Cant speak for a na car, but I had a 62mm tb with stock intake and swapped to frpp manifold with same 62mm tb and picked up 35rwhp at 12psi with a turbo no other changes and manifold was swapped same day on the dyno. Cant tell you what that would equate to na. But when a larger tb swap alone only make 1-3rwhp na, I would assume the mainfold is definetly part of that equation.

Pull up MattD's old testing he was the first one to get a frpp manifold and he previously has a ported stock manifold that netted zero gains. I know he posted his results a logn time ago.

I'd imagine that force feeding the air like you are would push the limits of the stock manifold. The same goes for a larger tb. Since you are force feeding the air there is very little to be gained when compared to a na or pd blower. IIRC I gained over 20/20 going from stock tb to 62mm when I had the whipple. No other changes except tuning for the larger tb. It was fairly impressive.

When I sold the whipple the 62mm tb was sold to Marc S who put it on his Procharged 4.6 with a c&l intake. He gained about 3rhwp also. The c&l gained 6 iirc.

 

[JeremyH]

I remember that thread where marc posted the dyno. He had 10-15hp gains under the curve though iirc which I pointed out. That was back when everyone swore up and down bigger tb was a paper weight and a waste of money. Mentality has shifted finally to most seeing it as a max effort or good supporting mod.

 

[wht67]

Just wondering... how different is the Coyote from the 3V intake? Could a Cobra Jet intake be adapted to a 3V?

 

[BruceH]

It would mostly depend on the intake ports and bolt patterns.

Just wondering... how different is the Coyote from the 3V intake? Could a Cobra Jet intake be adapted to a 3V?