My Son's 347 at the Dyno sucked big time...

[Wickd GT]

Here is the combination:
347 stroker from CHP/probe, I bought this from a friend which had the cam in it listed below.
9.30:1 compression
TW Heads out of the Box
1.6 TFS roller rockers
Elgin cam
Duration @ .050 ..... 222 232
SAE Duration ......... 300 309
Lobe Spreed ..... ..... 112
Hydraulic Roller
Valve Lift ............ .509 .532
Cobra upper and lower port work
70mm throttle body
73mm mass air
24lbs injectors
190ltr fuel pump
adjustable Fuel regulator
BBK 1 5/8 shorties and BBK 2.5 x pipe with Dynomax Ultra flow mufflers exhaust
3.73 gears
10" PTC converter 3k stall and AOD with kevlar bands etc..

I made pulls to 5800-6000rpms.
No matter what I did to it it will not put more than 303hp and 349.98 ft lbs???? I will raise the fuel pressure and nothing, I will add timing, improved to 300hp and 339ft lbs. Add fuel and timing it went to to 297 and 292, put the fuel at 38psi and 16* and that was the sweet spot, but only 303hp and 349.98 ft lbs.

Either the stock computer, which is a factory one for automatic, is fighting what I do or the cam is wrong for the combination. Or the damn dyno is not accurate. The car feels strong on the street, but that don't mean anything. I guess the track will tell. Any ideas here, is it the computer fighting this tune or the cam is not enough for the heads. What you guys think. A/F ratio was alway 13.5 no matter if I raised it or lower it???? I'm so ****ing piss that I can't even see straight:

Edgar

[QWKSNKE]

What did the graph look like? When did the curve start nosing over?

If it started losing power early (5000 rpm or so), then I still say the intake is not enough to handle the heads and cubic displacement. Also, in my opinion the MAF and intake piping are to small. Definitly will be if you ever swap the intake.

[QWKSNKE]

Forgot to ask when we were on the phone today, what kind of power were you expecting? The torque is there. The auto could have something to do with what the dyno says to. That auto is probably robbing a good 25 rwhp or more compared to the same combo with a 5 speed.

[Wickd GT]

Here is the graph:

[QWKSNKE]

I suspect with a EEC tune you could find another 10rwhp (Typically this is what we found on all of my n/a combos when we changed the tune in the computer). I still say you can find another 10-15 throughout the upper rpm range with a intake swap.

But like you said, the track will be the true test. From a dyno perspective my last combo with the Anderson cam dyno'd less than the same combo with a 'B' cam but the Anderson cam combo ran nearly a full second quicker at the track. Probably would have been a over a second quicker if I could have got the damn thing to hook off the line without breaking tranny's

[coupe]

I'm sure the Cobra isn't helping at 6000 RPM, but that combo should make huge midrange and torque... which IIRC, was actually down from the previous 302. The air has been bad lately (humid, warm, etc) so consider that too.

I think a tune is in order, to let the CPU know that it is a larger motor and to "tweak" some things... I think the next steps will be a larger cam (for the money, an X303, Z303, or Trick Flow stage 2 would be really nice) and ...yes... a different intake possibly like a RPMII or Systemax. I would also consider a DOWNS-Ford breadbox intake... it would sit right on that cobra lower and really wake up the power peak.

See what she does at trackday first tho. Might be surprised...lets hope it's cool and dry air!

[nxcoupe]

Is the cobra box stock or ported?

[Dale McPeters]

Edgar,

Lee & Matt are correct. You need a tune for the EEC. It still thinks it is running a stock 302 if you have not had a chip burned for it yet. The car should be putting down around 350ish.

The little baby 306 that I rebuilt that was in the '93 cobra made more than that...:jester:

[coupe]

I believe Edgar found someone locally who could access the computer and flash him a chip (maybe SCT?)...

I'm anxious to hear the results! :nice:

[Dale McPeters]

I believe Edgar found someone locally who could access the computer and flash him a chip (maybe SCT?)...

I'm anxious to hear the results! :nice:

That is good as that car is leaving a lot on the table.

Yep it is probably SCT.

[Wickd GT]

Well we got it tune with an SCT chip tune. Motor was real fat since the get go from the moment it hit the pedal until it let off, A/F ratio was 12.1 and 11.9. So the guy Wayne, work on some parameters of the computer and lean it out to 13.1 and he said left it that way to be in the safe side just in case bad fuel or if the weather gets in the cool side. Motor lay down 320hp and 358ft lbs. It was on a Dynomometer and has the Eddie brake which puts load on the motor. Fuel economy is better don't burn as much fuels as before and motor feels more responsive with better driving manners. He said if it had a manual tranny it will be 340 hp 370ft lbs. The tranny is sucking most of it. Not bad for 9.20:1 compression. Here is a video, now we will see what the track will show us.

Edgar

http://s118.photobucket.com/albums/o108/wickdgt/?action=view&current=Cheospulwithchip.flv

[qkjuicedpony]

Was it a Dynojet or a Mustang Dyno Edgar?

[Wickd GT]

Was it a Dynojet or a Mustang Dyno Edgar?


Mustang Dynamometer with the Eddie brake. Does this make any differrence.

Edgar

[TheJeanyus]

Mustang Dynamometer with the Eddie brake. Does this make any differrence.

Edgar
A dynojet will read higher than a Mustang dyno. :yup:

[qkjuicedpony]

Mustang Dynamometer with the Eddie brake. Does this make any differrence.

Edgar


Those number will read at or near 350rwhp on a dynojet.Maybe upwards of 360......370-380 with a 5 speed.


Congrats