Disappointing Dyno Numbers 93 Cobra

[mikebrewer1]

Here is the dyno sheet.

 

[mikebrewer1]

Still need to determine the current timing.

This may be a stupid question......but it was crazy hot and humid today....could that play a big enough factor in performance?

 

[HardmanGT]

Can't read the A/F but it looks nice and steady. They cleaned up the tune quite a bit from what it was.

 

[HardmanGT]

Still need to determine the current timing.

This may be a stupid question......but it was crazy hot and humid today....could that play a big enough factor in performance?

Very big factor

 

[mikebrewer1]

Yeah....there is no numbers attached to the A/F

 

[rsw007]

somethings a miss i put down 225 with stock h,c,i, and even stock rockers through an aod.it was 45 degrees that day.

 

[Rick 91GT]

We made 275RWHP with our near stock 93 Cobra, Crane 2031 cam, mildly cleaned up stock cast iron GT40's Extrude honed Cobra intake, stock TB, 83mm MAF, full exhaust and full emissions, cats, etc...

 

[18mustangs]

243 at the wheels sounds pretty good considering you have the B cam and a Cobra intake.

He didn't have the b cam, he had the stock cobra cam with the 1.7s, there is a difference as the b cam has a lot more duration even if the cobra cam's lift with 1.7s is .479 vs the bcam's .480.
Tim

 

[nosmatt]

BAAAAAAAAAAAAAAAAAA!



excessive motorsports, thats why...... you prolly got a set of gt40y heads on it, and got charged for afr.......


if it is a mustang dynom your still way low. go run it at the track, and weigh it. see if those numbers look better......


fwiw, i dynod a stock w catback only 95 cobra, and it makes your numbers look poor..... 245/290 with only 10* of timing, and a stock airfilter.......eventually did 266/303 with ALL the bolt ons without removing the valve covers.

 

[blackstangt]

better tune, try again, my friend went to one of those on truck dyno's and got 35 less hp to the wheels than what he got at an in house dyno, just bring it somewhere else. was your ac on...

 

[just4bob50]

what kind of dyno did you get tuned on. a mustang dyno will give way lower #s than a dynojet. My stock longblock made 248hp & 290tq.(SAE) on the dynjet. On the mustang dyno it would have been more like 220hp and 260tq. If you had your car tuned on a mustang dyno find a dynojet and pay for a couple of pulls and compare.

 

[thinker]

why is there such a big difference with a mustang dyno and a dynojet?

 

[mikebrewer1]

I put the AFR heads on myself. Not sure what type of dyno they are using and still need to check the timing. Hopefully, I can find something this weekend

 

[QDRHRSE]

So....am I reading right? Stock Cobra cam? If so, that's the problem. The Cobra cam is a lazy piece of crap. A stock cam would make more power....really.

 

[just4bob50]

the reason the difference is so large is because on the mustang dyno you enter the vehicle weight with driver and a drag coefficient at 50 mph. In other words, a real world load on the motor. On a dynojet there is a brake applied to the drum to put resistance on it, but it is the same resistance the entire way through the rpm range.

 

[Rick 91GT]

Are you still using the stock Cobra computer? It pulls a lot of timing out up top, not the best for making good power.

We ran the 2031 and it was made for the 1.7, very smooth and we made 425/465 with an A-trim on the combo.

 

[silverstripes]

This may not be the case BUT.......
I worked on a dyno-jet dyno for two years and if all the info isn't entered into the computer correctly the numbers will be out of whack.
We would play with the numbers when a ricer would come in we would make the reading high like 400rwhp and then let him down when we set it up correctly. 85rwhp

With a dyno it is just as accurate as its opperator.

The best dyno is good traction at the track. Nothing is more real than an actual run.

Use this formula Vehicle Weight x speed squared divided by 10,000 x e.t. equals rwhp.

This is as real as it gets. Every factor is accounted for and this is the actual hp being put to the ground. This is actually more scientificly correct than the best dyno. This even includes wind drag on the car. The figure will be the exact hp it takes to move a car of its shape and weight a certain distance in a certain amount of time at a certain speed.

 

[mikebrewer1]

Yeah, still using the stock computer, any suggestions or info for upgrading it? I'm going to install the 2031 cam, see where that puts me.

 

[The Fox]

can you use that example in a formula for us all? I tried it with some made up numbers and got like 45,158.4

 

[MattZ281LE]

Saw the car Friday,
Its the same dyno I pulled 306/330 with the AFR 165's. Dynojet 248c inground.

- Matt