Low 12 high 11 sec intakes
 

Back again,
I am asking this and hope I get the same feedback I got with the "NA Street Combos".
First let me explain to you what I have,and tell me what needs to be replaced:
I have a Cobra intake with 60mm throttle body,ported stock MAF sensor,Mac 1 5/8 shorty headers,into a Mac h-pipe with converters,E303 cam,1.6 bolt down roller rockers,underdrive pulleys,PS-91 coil,9mm Motorsport wires,adj regulator.
The parts I have in are TFW Twisted Wedge heads with a Fox Lake Stage 1 port 280/210,Custom cam .555/.557,cold air induction,75mm calibrated maf sensor,24 pound injectors.
Do you all think the Cobra intake is stout enough,or should I replace it with a Holley Systemaxx or TFS intake? Like the subject line says looking for low 12's high 11's.
I hate to keep bugging you all but I am real curious about this one because once again in NMRA the "Factory Stock" cars are running low 12's high 11's with out of the box intakes and most of those are Cobra/GT40 intakes.
Thanks guys and gals for any feedback you can offer.

the cobra is a good intake, but with thoose heads and cam, the Holley with a 75 mm throttle body will make a lot more power.

Oops
 

by the way those are TFS Twisted Wedge heads,not TFW maybe I better start using that preview button.

Those factory intakes are ussually ported, but it is possible to run 11's with the stock intake. BUT, you will be that much faster with the holley or TFS.

You CAN you a Cobra intake, but the Holley is gonna make more power. If you've go the dough, I'd go with the Holley intake.

RPM427: I would think a 75mm throttle body would be too big for his aplication.

a 75 mm for an 11 sec car is not too big.

The Edelbrock performer RPM is another option. Just check out all the combo's on Anderson Ford's website, theres a bunch of guys in the 11's NA with the RPM intake.

By the way, a 70mm TB would be best unless you plan on getting really serious with it and possibly going with a supercharger sometime down the line

Big throttle Bodies
 

I guess with throttle bodies the good thing about them is,they only flow air.
Not like the good old carburetor where you can definitely go too big there.
I was thinking somewhere between a 65-70,well there is no where between,you either get a 65 or 70mm throttle body.
Lot of good suggestions here,Holley looks like a big intake,that needs a ton of rpm to really take advantage of.
Not saying it is not a good intake,but I definitely want to stay away from the bigger is better theme that get's a lot of people in trouble.
I was reading the rules on NMRA Factory Stock cars,(not that I am running that class) and they have to run an out of the box intake un-ported,if that is the case then those GT40/Cobra/Explorer intakes are pretty stout,and at the same time they are purpose built cars for a specific reason.
I believe in aftermarket equipment,but the FRPP stuff is pretty stout,but I am looking at all avenues here and keeping my options open.
Thanks again for all the suggestions,I got my work cut out for me,but it sure is going to be fun getting there.

The stock intake flows like crap. The Holley outflows almost everything, and completely destroys the stock intake, cobra, GT40, etc...great low end power, mid, and top end. As far as throttle body's go, a 70mm throttle is good up to 650hp, take that as you may. You've spent the money on a good set of heads, don't choke it down with a lesser intake. Holley is the way to go, yeah you might make "decent" power with another intake, but you'll make the MOST/OPTIMAL horsepower with the Holley. It's up to you if you want the best of the best.

Yes it is.

I would go with the tfs track heat intake and for the trottle body unless you plan on supercharging I would go with the 70mm and get a better mas like one from c&l or pro m and if you have a cai of any kind that is metal I would heat wrap it they seen to heat up to fast and to much mine seem to get hotter then my intake so its defeating the reason of having it cause your just heating the air up as it goes through ......... the holloy is a GREAT intake but it needs to much rpm and with the cam you have I would stick to the tfs manifold...........but that just what I would do

Lot of good suggestions
 

Appreciate all the good suggestions they are definitely welcomed,I know in all the rags(magazines) they think pretty highly of the Holley Systemaxx,and you see that intake on a lot of high-powered supercharger cars.

Next to cylinder heads,this has been a pretty hard decision also,it took me 4 months to decide which cylinder head I wanted now I got them,and they look stout as does the cam,if you all have the resources I strongly recommend either Fox Lake or FlowTech Induction,you cannot go wrong either way.

Well back to the drawing board(LOL) and frying more brain cells,good thing I decided to ask this I was going to put a TFS R intake on it and choke it down with a 65mm throttle body to hopefully pick up torque down low,but that idea was scratched quickly.

Anyway thanks for all the help but I was just wondering can you even buy a 65mm throttle body anymore? Because if a 70mm throttle body is good for 650hp,and I know I am not making that much or close to it,then what is a 65mm good for? Lot of good ideas out there that is for sure.

how dose the TFS street intake compare t othe holley?? like on a 302 and also on a 331?

he Holley will outflow a Street and Track heat all day long and it will outflow a R up to 6600rpm. Flow numbers don't mean more power.

As for the 75mm being too big I say no it isn't, I picked up 2mph with just a swap from a 65mm Accufab to my 75mm Accufab with no loss in low end torque although my combo is based on making more power up top where I can take advantage of it. Rick @ AFM told me buy it big and buy it once on numerous dyno's down there they have seen no damage by having a large 75mm-80mm TB on a NA car with healthy combo's. They say a 75mm MAF is good for 650HP as well but how many 600HP cars have that small of a MAF..none. You will need to port match your heads to the Holley though it has a 1262 gasket port. It really depends on your combo.

Whats the duration on your cam? How much overlap does it have?

all I know is that when I put my Systemax upper and lower on my car it did wonders for the ENTIRE RPM range!! That's definately what I'd go for in your situation.

(thanks again for the help Rick)

Dave

I had the edelbrock, and it was great. TONS of lowend. I went 12.5 on the smog cam and unported parts with no tuneing.


I am selling my edelbrock, and I have a holley now. If my car gets running right I'll letcha know how I like it.


Skyler

Thanks Rick, I agree with you on the Throttle body.

The Holley is a great intake. I had it on my car before I re-did the engine. I made 242 RWHP with this combo:

Holley systemax intake
full length headers
mac cat back
electric fan

So my engine was making 280-285 flywheel hp with just those mods. I was making 197 rwhp stock, so I picked up 45 hp with those mods. I also gained it throughout the whole rpm range.

Well I got my car going, I suggest you read the post of my impressions of the holley intake.


Skyler

If you are referring to the Factory Stock cars, those intakes are NOT ported in any way. I know a guy running F/S and bought a Cobra intake off him because he couldn't use it, somone had ported the TB for a 70mm tb. He's running consistently in the 11's. Most of that is suspension and driving.

That is true, but if you don't have any class restrictions, bolting up the holley will give you extra power.

Thanks again
 

Gents and Ladies,
thanks again for the positive feedback,those "Factory Stock" cars are simply amazing,not only do they run close to factory equipment,they must weighbetween 3200-3400 pounds depending on which heads they run.

I still am un-decided about about what intake to run,I always knew that the Holley intake is a little big,for a mild street application,and I consider my car pretty mild,hell it still get's 23 mpg with a Cobra intake,E303,and 3.73 gears,and a lot of other bolt-on goodies.

Once again thanks for the replies,and the positive feedback,we all stayed focussed on the subject at hand.

RPM427 - did you have to do anything with your pistons for the stage 2 cam to work? how is the sound of it? what kinda time are you running?

I tested the difference between a 65mm and 70mm throttle bodies at the track.

I saw no difference at all on my car. It ran exactly the same.

I had a pretty mild combo before the blower,

302
mild 1262'd TFS heads
E-303/1.72's
Holley intake
equal shorties
H/full cat back
65 and 70 mm t.b's
30 lb injectors
Pro-m 75
pulleys
3.73's
T-5
28" ET Streets

I would trap around 110 with my GT-40 with a ported lower, and switching to the Holley gave me 112-113 mph trap speeds.

I agree with 1bad89, i see no reason to use a 75mm tb, unless your sc'd, turbo'd, or a big stroker, the 70mm is enough for any street car, even sc'd on the street especially.

many car in the 11's with a 65-70mm.

The stage 2 BARELY fit my stock pistons, It sounds great, idles half way decent. Now setting of car alarms is a sport to me. I havn't gotten a chance to take it to the trrack yet:( , but it made 326 RWHP on the dyno.

Stangrrr runs in the 10's with a stock ported throttle body. He made somewhere around 520 rwhp.

so the stage two cam works with stock pistons with the TFS heads? huh

while we're on the subject...
 

RPM427:

You made 326 rwhp with the stage 2 tfs cam and the systemax II? I assume you are running stock pistons... so I have a tick more compression, and am using the stage I and the TFS intake. What kind of power would you wager I am making?

Also, on a slightly less related subject, My EGR stuff isn't fitting to well up to my intake because I have a kirbain billet fuel pressure regulator. The EGR plate comes about 1/8th of an inch from being flush to the intake. How can I remedy this problem? Can I just leave off the EGR plate altogether? Will I lose driveability, gas mileage? Once again this is on a TFS street intake.