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Unread 12-25-2010   #1 (permalink)
5.0mustangaod is offline Apprentice


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Exclamation 5.0 Mustang Edelbrock HCI, feels underpowered

Just finished a Edelbrock 5.0 HCI swap, car feels really underpowered, theres no low down grunt, not alot of torque in the lower RPM's. It picks up around 4000RPM. Honestly and I hate to say it, it felt like it had a much stronger power band stock. WTF is wrong with this thing? Stock I was able to break the tires loose around corners. Now wide open, it just drives around, doesnt break the tires loose what so ever unless im above 4000RPM. Seems like its running kind of rich, strong fuel smell, I do have the fuel canister vacuum line disconnected could that be the fuel smell issue?

Edelbrock 60379 heads, port and polish
Edelbrock Performer RPM II Intake port and polish
3/4' intake spacer
FRPP E303 Cam
Scorpion Roller Rockers 1.6
FRPP 24LBS injectors
Kirban fuel pressure regulator
Walbro 255 LPH pump
Pro-M 73mm MAF sensor paired to 24LBS injectors
70mm Accufab throttle body
FRPP Lifters
Comp Pushrods
Ford Racing Valve covers
BBK Equal Length headers
BBK Off road H-Pipe
Flowmaster tails
Fuel pressure set at 40PSI vacuum line off.
Timing at 14 degrees.
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Unread 12-25-2010   #2 (permalink)
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You added bigger heads and a larger duration cam. Thats what happens! You would have been happier had you left the Stock HO cam in there.

What are the rear gears? How did you set the Rockers up?
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Unread 12-26-2010   #3 (permalink)
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is it tuned? A good tuner could solve that
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Unread 12-26-2010   #4 (permalink)
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Quote:
Originally Posted by 89coupe View Post
You added bigger heads and a larger duration cam. Thats what happens! You would have been happier had you left the Stock HO cam in there.

What are the rear gears? How did you set the Rockers up?
A stock stang can break the tires loose there must be something wrong
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Unread 12-26-2010   #5 (permalink)
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Your EGR needs to run or be removed. Turn your fuel pressure down to 38# run the codes and get a mail order chip for your setup. Ditch that spacer if you can.

DIY KOEO/KOER/Cylinder Balance Self-Test Procedure

Ford Fuel Injection Two Digit Codes 75-99
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Unread 12-27-2010   #6 (permalink)
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Yeah have 373 gears, and rockers are straight pedal mount they fit perfectly, still able to turn pushrod. I do get code 91, which is apparently either my O2 sensors or fuel pressure
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Unread 12-27-2010   #7 (permalink)
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Quote:
Originally Posted by spdjnky_42 View Post
get a mail order chip for your setup.
You be better off getting a mail order bride......

Lose the the junk cam get one the is compatible with the rest of the combo.....

Preferably a custom grind.......

Have the car dyno tuned.....

Have a chip burned if needed T

The end.....
 
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Unread 12-27-2010   #8 (permalink)
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Quote:
Originally Posted by Tim@5150 View Post
A stock stang can break the tires loose there must be something wrong
I realize that, but when you add larger heads and a cam with larger duration, you move the power to the right, same power plus more can be made, just at a higher rpm. When a cam is used with a IVC point later after BDC, its takes more compression to make up for the lower RPM loss in power. As well as steeper gears. If the cam was shorter in duration, with the IVC closer to BDC, the cylinder pressure goes up as well as the power in the lower RPM's.

Even with the stock heads, the F303 cam likes to be around 3000rpms. Now add a larger CSA head and the power is shifted even higher. You have to cam accordingly, which does not mean a larger duration cam all the time. Unless you want a high reving power band you have to keep the duration lower when the heads get larger, not the other way around. So to compromise, you add more gear to get in the power band quicker, but that just makes a peaky engine with short power band in most cases.

I'd rather see 4.10's with the F303. But even with 3.73's an assuming a T-5 trans that's still. 12.50 drive ration in first gear. Should blow the tires off there. 266hr or 258hr cam would do a lot better as far as an OTS cam.

So he hasn't lost power, he just has it in a a different spot.
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Unread 12-27-2010   #9 (permalink)
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So he hasn't lost power, he just has it in a a different spot.
Sort of like a fat chick that says she has lost 10lbs.....

And the response is "its not lost just look behind you"....

Same with a powerband....

The power is still there just in a different location.......
 
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Unread 12-27-2010   #10 (permalink)
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Haha, nice Reggie, oh well cars going up forsale in Febuary, selling for a newer Benz.
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Unread 12-27-2010   #11 (permalink)
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Quote:
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Haha, nice Reggie, oh well cars going up forsale in Febuary, selling for a newer Benz.
Yuck, why?

Youre going to give up so easily?
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Unread 12-28-2010   #12 (permalink)
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Ha I work for Mercedes also childhood dream car was a 99 C43 which is what I have the Opportunity to buy.
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Unread 12-28-2010   #13 (permalink)
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must have had a troubled childhood...:kooky:
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Unread 12-28-2010   #14 (permalink)
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Ha I work for Mercedes also childhood dream car was a 99 C43 which is what I have the Opportunity to buy.
Kraut Wagens.... yuck....
 
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Unread 12-28-2010   #15 (permalink)
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try checking your tps volts to see if they are ok and see if your maf sensor is dirty because mine was and i had a bit loss of power.
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