question on porting

[93GTDIN]

given the combo in my signature, would porting the heads really yeild me any power? If so, what kind do I need, a stage I, II, or what?

thanks

[ChunkFunky]

Sorry, this isnt an answer to your question.. but I'm got a vert and I have comming a set of twisted wedges and matching intake.. just wondering what your times are... wanted to know what I was to look forward to
-as

[jimmyjamed]

If done right it can, but you don't want them hogged out. The main objective is velocity. And after a point, when port size goes up, velocity can go down.

[93GTDIN]

chunkyfunky - Car is pretty quick but lacks the low end i'd like. I'm getting 4.10's which should fix that. The TFS cam creates poor vacuum and therefore does not work well with an automatic. Sometimes when warm, car stalls when put into gear. It's not as bad as it sounds, though. All in all, the car pulls obscenely above 3000, but not much below. I would recomend against the TFS stage I cam for a daily driver.

And now back to the topic

-so how much power would I have to gain from a mild port job? 15- 20 horses?

[Nixon1]

93GT: Your car sounds just like mine...all of the mods are from an idiot prev. owner though that doesnt know what he put in it, so I'm just doing all guesswork..but 0-3000 rpms it isn't much faster than my V6 Camaro..but past, it's disgusting...pulls hard all the way through the top end...why do you think yours is like that, cam or heads? Just curious..I'd really like some more low end power for the street and I'm trying to figure what I can do to fix this....

[ChunkFunky]

I havent put in the TFS stuff yet, I was going to go with the TFS stage one as everyone suggested it was best... though it seems that alot of the low end can be gained from the intake... I guess that's why people like the cobra intake... in anycase... since we seem to be in the same boat as far as having CONVERTIBLE AOD cars, I think we all will be lacking low end for a number of reasons... power loss through the AOD, less gears and therefore higher gearing in the AOD, Heaviest foxbody, and the least amount of weight in the rear (bad traction). So we're allready playing with a handicap. I have some 3.73 gears waiting to be put in, as well as the Twisted wedges heads and intake. I was hoping for some nice power increase... wich I'm sure I'll find.. I wonder if a different cam would be in order... though as long as the car MOVES on the street I'm ok with that... since once you're out of first gear you spend the rest of the time in 3000 and above... as it is.. my engine is stock and it doesn start pulling till about 2500 but it feel like it dies off around 5000...
ok.. enough from me... just thinking out loud here
-as

Originally posted by ChunkFunky
I wonder if a different cam would be in order... though as long as the car MOVES on the street I'm ok with that... since once you're out of first gear you spend the rest of the time in 3000 and above... as it is.. my engine is stock and it doesn start pulling till about 2500 but it feel like it dies off around 5000...
ok.. enough from me... just thinking out loud here
-as

Yes, definitely get a bigger cam put in there to get the most out of your new heads & intake. With a cam, heads, intake...it will pull up to 6000rpms...instead of dieing off at 5000 like you mentioned. Just shop around and do your research to hopefully find a cam that has "some" low end, as well as more top end than the stock cam. I run the B-303 w/ 1.72 roller rockers. It doesn't have a whole lot of torque under 3000rpms...but you can't notice it much with all of the extra horsepower from the heads, intake, cam. It's still a very streetable set up...but I'm sure there are some better cams out there. I rebuilt my motor about 4-5 years ago...so I didn't have the selection of aftermarket cams that are available for the 5.0 now.

[Nixon1]

Just found out that the previous owner lied and my car has the stock cam...so it's actually lightly modified..but it doesn't have much low end at all, doesnt pull good until 3000 or so but it pulls HARD all the way up to AND THROUGH redline..never loses a drop of power...and I've had it up to 6500, I know!

[dragstang86]

my car is the opposite, i have a ton of low end and not as much top end as i would like. I have a c-4 with a 3500 stall convertor and 373's. I wonder if my stock maf sensor could be holding my top end down a noticable amount? I also plan on taking off the cobra intake and putting on either the new rpm2 of the systemax intake in hopes of getting more high rpm power. I can only put all that torque to use at the track on slicks since all i do is fry the tires on the street. Before i just put the AFR 165's and roller rockers on it, it went a 13.03 with a 1.76 60ft but only at 103mph. Dont know what it runs with the newheads. It could just be my imagination though because im used to driving the race car going 9.0's @ 150+.

[ChunkFunky]

I wont pretend to know alot about intakes.. but from all I've read.. teh cobra is good for low end...though also from what I've read the holley and TFS stuff has big runners and therefor good for highend power... so it makes sense that your cobra would give it to you down low... though I certainly cant tell you what the best route would be... post a thread about it.. I'm sure you'll get a million responsed.. everyone loves the INTAKE questions
-as

[BilLster]

change the gears first and then think about porting or changing the cam. maybe even bigger than 410's ?

you might not be concerned once the power is where it should be what gears are you running now ? rear tire size ?

porting will increase upper hp but if you have low end problems right now i wouldnt do it.

increase also depends on how well the heads were finished ive seen people not get any gains and seen as much as 90hp on a full blown race engine.

but its all the overall combo that counts

[93GTDIN]

Car has 3.27's with about a 25.1 inch tire

I drive the car on the highway quite a bit, so I dont think i'll go higher than 4.10's. I'm also gonna get some 275/40 nittos on the back which should put me up to about a 26 inch tire, or i may go 275/45's which is good for a 27 inch tire.

[BilLster]

with a 27 inch tire and 4:30 65 is about 3500 rpm with a aod
not to bad.
but i think the biggest factor right now is gearing and your whole
setup will act diffrent with a gear change.

[AJSTANG]

93GTDin: My motor combo includes twisted wedge heads, cobra intake and lunati cam (equal to TFS stage I). This engine in my 93 GT conv yielded 12.8/108 mph. In avg weather I ran low 13's @107. You could port the heads for a few extra ponies, but I recommend that you rebuild the AOD with a higher stall converter and 3.73 gears or swap to a T-5 if you want to run quicker.

My car too did not run well after parts were initally put on and often stalled. It also felt very sluggish on the low end. The initial reason I got from the tuner was the old excuse of "the computer needs time to learn the new parameters." I took the car back a couple more times. Turns out that the TPS sensor was reading > 1 volt. I got this readjusted to less than 1 volt and I no longer had the idling problem. The low end sluggishness was cured by adjusting the timing to 18 degrees initial and fuel pressure to 45 @ zero vacuum. At the track, the mph went from 103 to 107 in the heavy vert. I now trap 109 with this engine in a lighter coupe.


Chunkfunky: The TFS street intake is worth an additional 10-20 hp over the stock Cobra intake; good power up to about 5500. The TFS track heat makes power up to 6500. I think the TFS intake, stage I cam and twisted wedge heads is a good package. Based on info from people who have this combo, the power figures are 290-300 rwhp/315-325 rwtrq.

[93GTDIN]

AJStang: THanks for your post, I have a few questions:

What fuel pressure do you run now, I run about 30 - 33 psi
What timing do you run now?
I was thinking of getting 4.10's, do you think I should get the 3.73's instead?
Where did you get your car "tuned"?

[AJSTANG]

18 degrees and 45 psi @ zero vacuum. I would recommend a 3500 rpm stall converter and 3.73 gears. The stock AOD is a "slush box" resulting in a 1/2 sec loss in 1/4 mile ET.

[93GTDIN]

isn't 3500 way to high for the street? i dont want to be powerbraking at stoplights.

[ChunkFunky]

You shouldnt have to powerbrake at a stoplights... with a 3500 stall it would grab at 3500 solidly but it'll grab before that... even if it were an all or nothing thing... then you would hit the gas and wouldnt get going till 3500... it shouldnt make you STALL or anything like that.
-as