This is topic GT-40 iron heads rwhp question? in forum Tech Talk at Northern California Ford Owners  .


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Posted by shade-tree (Member # 298) on :
 
There's a post on the corral about this:
does this sound like mustang dyno fluff?
makes me want to verify my combo at the track!

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Dynoed my 93 Cobra at NMRA'S!
The combo is in my sig. It made 278 h/p and 311 tq. I was happy to say the least especially considering my A/F was in the 12.5-1 - 12.8-1 range and the car was full operating temp! I figure I could gain some more with a leaner A/F at least the dyno operator thought so he said it was to rich. Longblock is untouched sans the E-303, and all the bolt ons!

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93 Cobra> Vibrant Red/Black Cloth, 17,000 miles, Stock Longblock/E-Cam with Motorsport Valve Springs, Longtubes/Full Exhaust, A9L Computer, C&L 76, ASP Pulleys, AFPR, 255intank, and 3.55's. All else is stock down to the sparkplugs! Best time to date>12.85@108.9 on drag Radials. www.southrides.com
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Posted by 93PONY (Member # 60) on :
 
Sounds right to me.
Was it on a mustang-dyno?

Trey runs pretty strong, but considering the mods, it's no mystery.
93 Cobra cams are CRAP! You can gain 20RWHP from a swap to a stock GT cam! The 'E' probably gave him 4-5MPH in the quarter. Add a good exhaust combo, 1.7's, & a computer that doesn't pull timing....
GT40 Irons flow ~180/130 from the factory.
 

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Posted by HungryHippo (Member # 537) on :
 
sounds good with that kind of mph
 

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Posted by TM88GT (Member # 105) on :
 
That sounds about right - stock GT40 irons, E303 cam, Cobra intake = 270'ish rwhp

That mph is rather impressive

[ October 02, 2002, 01:25 PM: Message edited by: TM88GT ]
 

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Posted by st5150 (Member # 51) on :
 
They make 240 rwhp from the factory, figure 15 rwhp from the exhaust and 15 from the cam?
 

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Posted by shade-tree (Member # 298) on :
 
I thought it was 240 fly-wheel HP from the factory,( a little underrated, maybe 250-255) + 5-10 HP from the A9L, + 5-10 from pulleys, + 5-10 from the cam, still doesn't add up to near 280rwhp?
 

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Posted by 67stang (Member # 549) on :
 
Well considering i just bought a Teal 93 Cobra, bone stock down to the original plug wires (see pic below for proof

I DEFINATELY would say that it makes (seat of the pants) noticably more power than a stock 5.0HO. To me the power is in the form of low-mid range torque. This car, with stock 3.08 gears, really feels as if it pulls stronger to 3000 then my 88LX did with 3.55's before the motor was modded.

The were rated by Ford marketing at 235HP@4600 and 280lb.ft.@4000 net. I am taking this directly from the 1993 marketing brochure I got with the car.

Interestingly i have some other magazine clippings the Previous owner gave me, which say the car was under rated, and was more on the tune of 250hp and 300lb.ft. This would be roughly 220 at the wheels.
Add exhaust and you're at 235 or so.
Add the C&L, remove silencer, and perhaps 245
Do the A9L and perhaps 250

Now add the E cam, and yes, 270 at the wheels is plausible, ESPECIALLY when it corroborated with a 109mph.

Anyway, I dont think a stock 5.0HO mustang cam is going to gain "20 HP at the rear wheels"... let's not get too optimistic.

I have seen several people report about those numbers (20-25 rwhp) with an E,B, or 2040 cam and no other changes.

This owner changed to an A9L which is supposed to offer more aggressive timing. I'd give it 10HP at the most IF the mass air sensor is changed, mass air meter is changed, and an AFPR is added and set accordingly.

just my 2 cents




 

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Posted by shade-tree (Member # 298) on :
 
nice buy Chirag
actual gtech numbers from my car:
stock HO motor + bolt-ons --> 108 mph, 12.9s at 104 actual
'94 cobra motor +minor bolt ons --> 111 mph, who knows actual
 

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Posted by 93PONY (Member # 60) on :
 

quote:

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Originally posted by 67stang:
[QB]Anyway, I dont think a stock 5.0HO mustang cam is going to gain "20 HP at the rear wheels"... let's not get too optimistic.

/QB]

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From the mouth of Ed Curtis....as seen on a dynojet by one of his customers who was unhappy with the performance of his 'Cobra' cam.

I too have a Teal 93 & recenently swaped from the cobra to a stock GT cam.
 

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Posted by shade-tree (Member # 298) on :
 
and...... what was it worth?
 

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Posted by 93PONY (Member # 60) on :
 
On my car???? Don't know. I did a few other things when doing the rebuild so....
Wouldn't be a valid test anyway, I'm not N/A.

Had a dyno appointment on Saturday, but it got canceled... Byron's out of town. D'oh!
 

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Posted by st5150 (Member # 51) on :
 
shade-tree - 3 years ago I saw a 93 cobra dyno at 244 rwhp with only 3 chamber flows and no air silencer.

67stang - Congrats on the purchase. You have quite a stable now... drag duty 67, heads/intake LX and a stocker 93 Cobra. What are the plans for the Cobra? As for the Cobra feeling stronger down low, I'm sure some of it has to do with the stock 5.O exhaust that is choking up the motor. Cobra's are suppose to respond nicely with exhaust.
 

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Posted by FasterDamnit (Member # 442) on :
 
The '88 was sold to make room for the Cobra.
 

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Posted by 67stang (Member # 549) on :
 

quote:

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Originally posted by st5150:
shade-tree - 3 years ago I saw a 93 cobra dyno at 244 rwhp with only 3 chamber flows and no air silencer.

67stang - Congrats on the purchase. You have quite a stable now... drag duty 67, heads/intake LX and a stocker 93 Cobra. What are the plans for the Cobra? As for the Cobra feeling stronger down low, I'm sure some of it has to do with the stock 5.O exhaust that is choking up the motor. Cobra's are suppose to respond nicely with exhaust.

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thanks sawson. As Jim pointed out, the 88 was sold (Jim, keep an eye out for it, kid was from Fairfield

Not sure what the plans for the 93 are, other than to enjoy and maintain it, maybe show it a little, and definatley some autox.

Dont have any plans to turn it into a sac raceway special. The 67 will serve that purpose.
 

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Posted by st5150 (Member # 51) on :
 
Sweet, I'm sure you'll take it to Sac raceway for a base line or two.... maybe a few more trips after you see what 3.90's, full exhaust and the "15 minute" 5.O tune up nets you

If you don't want to hassle with all the A9L/MAF swap stuff, just get a chip from racesystems.com, they can copy all the A9L tables onto a chip for your Z3M. I think the biggest Cobra EEC hurdle is the delay the EEC has before going into WOT mode after the pedal is mashed.
 

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Posted by TheBrain (Member # 35) on :
 

quote:

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Originally posted by 67stang:
This car, with stock 3.08 gears,

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