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Author
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Topic: MY GIRLFRIEND'S DYNO RESULTS 97 Cobra S Trim
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85GT
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Member # 1695
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posted
 
 
My girlfriend got her cobra rebuilt at HCI. We took the car to get dyno'd today. On a Dynojet with A/F at 11.5:1 and i believe 20 or 22 degrees total timing she put down 402hp at the wheels! And 358 lb ft torque! Not bad for a daily driver huh???
Posts: 414 | From: Antioch | Registered: Aug 2002
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DV92Camaro
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Member # 2739
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posted
really good numbers
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1992 Camaro Z28 - SOLD
1989 Honda Civic
Posts: 290 | From: San Jose, CA | Registered: Apr 2003
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FoX GT
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Member # 4587
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posted
looks like you got what your were lookin for!
![[Whoo Whooooo!]](graemlins/woowoo.gif)
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- AED -
03 Cobra 10th anni 3.4 Whipple 9.47@141
2012 Mustang GT 10.98@125
2015 Mustang GT
Bring what you got and hope its enough!
Posts: 1955 | From: East bay | Registered: Jun 2004
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Blue Oval
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Member # 2548
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posted
HCI!
Nice #'s
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65 Coupe 306, AFR's
89 Cali. Ed. Saleen "sold"
BAB 89 GT
08 Yamaha R6
Posts: 2345 | From: Sacramento | Registered: Mar 2003
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JohnB
Tech Moderator
Member # 969
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posted
What sort of psi is it pushing?
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
quote:
Originally posted by JohnB:
What sort of psi is it pushing?
yeah, and is this with an aftercooler?....What kinda rebuild was it?....Isn't that what a stock 4V with a few bolt ons would hit?...What her combo??...
[ October 20, 2004, 07:43 AM: Message edited by: BlackNGold ]
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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1Sicgt
CAFords OG
Member # 714
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posted
Is it me, but isn't the torque number low???? ![[Confused]](confused.gif)
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14 Focus TS ST3 full Stg3, ready for bigger Turbo
2003 Cobra Track Car
Posts: 8145 | From: Hitting the Apex | Registered: Jan 2002
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
quote:
Originally posted by 1Sicgt:
Is it me, but isn't the torque number low????
It's not you....
For a built motor (not knowing what combo is being run) those numbers seem low.... ![[Frown]](frown.gif)
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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NO MANRZ
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Member # 566
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posted
That is horrible for a s-trim and a built motor unless it huffing 6-7 pounds. Let me guess 8.5 compression... big mistake.
Posts: 1938 | Registered: Nov 2001
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1fast281
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Member # 4670
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posted
Even for 6-7 pounds that is not good. A 100% stock engine 4V engine should be making over 400rwhp with an S-Trim.
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1998 Mark VIII LSC Black/Graphite
2005 Pontiac GTO Silver/Black
Posts: 578 | From: north bay | Registered: Jul 2004
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Hungry Hippo
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Member # 537
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posted
building a stout bottom end does not add power
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05 S4 Avant(wagon)
09 C6 H/C/I
Posts: 2959 | From: east bay | Registered: Nov 2001
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166 Merlo
FELONY
MOTORSPORTS
Member # 1549
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posted
So your girlfriend smokes you? ![[Big Grin]](biggrin.gif)
quote:
Originally posted by NO MANRZ:
That is horrible for a s-trim and a built motor unless it huffing 6-7 pounds. Let me guess 8.5 compression... big mistake.
why is low compression a big mistake?
[ October 21, 2004, 11:55 AM: Message edited by: Mr JoCo ]
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'89 - Boss Coupe
'70 - Drop Cutthang
'68 - Cougnut
'87 - 0166, Its real
Posts: 3953 | From: Thebay | Registered: Jul 2002
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gt40
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Member # 3587
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posted
Is the motor smog legal?
Posts: 357 | From: n/a | Registered: Oct 2003
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66 AC COBRA
Nitrous King
Member # 904
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posted
quote:
Originally posted by Mr JoCo:
So your girlfriend smokes you?
quote:
Originally posted by NO MANRZ:
That is horrible for a s-trim and a built motor unless it huffing 6-7 pounds. Let me guess 8.5 compression... big mistake.
why is low compression a big mistake?
if only running 6-7 psi you dont need that low of compression, you could run 10:1 and run 6-7 psi and be fine on pump gas
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FFR AC Cobra
72 Vega - WCHRA Extreme 10.5
Posts: 6280 | From: Winters | Registered: Feb 2002
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NO MANRZ
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Member # 566
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posted
quote:
Originally posted by Mr JoCo:
So your girlfriend smokes you?
quote:
Originally posted by NO MANRZ:
That is horrible for a s-trim and a built motor unless it huffing 6-7 pounds. Let me guess 8.5 compression... big mistake.
why is low compression a big mistake?
You want to keep the compression on these dinky motors as close as you can to stock. So around 9.6-10:1 is great. The main reason for this is to keep the very little torque these motors make. Why would you make a motor with no torque even worse.
From only the fastest supercharged 4 valve drag racer, not bench racer--
Reducing compression a full point means a significant loss in torque.
Example:
Vobra with 12 psi nets 500 rwhp and 440 pounds of torque
8.7:1 compression with the same combo now means the car makes 450 rwhp and 390 pounds of torque.
If our same cars had 5.4's I would say lowering the compression wouldn't be a big deal because there would still be more torque than horsepower. It wouldnt have as drastic affects as it does with a 283 CI 4V Mod Motor. It's the combination of small cubic inch displacement, and cylinder head design that require the higher compression to optimize the efficiency of the motor.
If you can live with less power and slower numbers at the track and added insurance is more important than optimizing the overall performance I would then say lower compression would be the way to go. I would recommend an 11cc dish maximum though no larger.
PRO's
1. More protection against detonation (Pre-ignition). This means you may run about 2-3 degrees more timing per giving octane than stock compression. If your tuner does not put the proper fuel curve into the tuneup you will still blow up. If you run out of fuel you can damage the entire engine regardless of compression ratio. Running an intercooler that can reduce air inlet temps about 75 degrees colder will have about the same amount of detonation protection.
2. Running a dish piston allows you to sometimes run a higher lift camshaft and not worry about piston to valve clearance. However with a 4V Cobra engine, you never have to worry about that anyway because you don't run a ton of lift.
Cons
1. 40 to 55 pounds of torque loss can mean as much as 5 tenths and 5 mph in the quarter mile. Or if your racing your buddy it could mean you are at a 5 to 6 car length disadvantage.
2. Less Torque means the car simply will not accelerate as quickly.
3. 40 to 55 pounds of torque is hard to make up. Think about some of the mods it takes to get 40 to 55 pounds of torque back. Some examples are.
a. Adding 5 to 8 pounds of boost (depending upon the efficiency of your power adder)
b. Removing about 500 pounds from your car.
c. Adding an air to water intercooler and adding more timing to your tuneup.
d. Getting extensive head porting and matching billet camshafts.
e. Adding a 30 shot of nitrous.
f. Adding about 30-35 cubic inches.
[ October 21, 2004, 02:55 PM: Message edited by: NO MANRZ ]
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Bring It . . .
Posts: 1938 | Registered: Nov 2001
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166 Merlo
FELONY
MOTORSPORTS
Member # 1549
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posted
so if he was boostin about 20lbs then it's a good idea?
Thanks for the info, cleared a lot of stuff up. Still got some questions but for the sake of this thread I'll save them for next time ![[patriot]](graemlins/patriot.gif)
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'89 - Boss Coupe
'70 - Drop Cutthang
'68 - Cougnut
'87 - 0166, Its real
Posts: 3953 | From: Thebay | Registered: Jul 2002
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