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CC Advertisers
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01-05-2009, 06:05 PM
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CC Member
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Join Date: Dec 2006
Cobra Make, Engine: CSX 4000; Shelby aluminum FE with 58mm IDAs
Posts: 1,116
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Not Ranked
Quote:
Originally Posted by diegokid
I hate eating crow but sometimes you just have to take a bite and swallow then remember the lesson. I made a comment a few posts back about a Dodge Demon my brother drives. It has 116,000 miles on it with a HP 340 running a set of 3:23 gears with a four speed its a stock motor. On my way to town the other morning I was running about 60 when he pulled up beside me. I downshifted to 4th and he actually pulled away from me, slowly but he pulled away, he stayed in fourth also and admitted he was suprised. I'm using the FE406 with a tremec five speed with 3:42 gears. Don't know what the weight difference is but I'm pretty sure my car is lighter.
If the crow is slow roasted and your brother is providing the beer to chase it with it isn't that bad.
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Something doesn't sound right with this scenario.... 
A Dodge Demon with a stock 340 is probably a mid-14-second quarter-mile car (engine rated at 275 hp from factory; and weight of 3,300 lbs).
Either your brother isn't running a stock 340, you need to get your engine tuned, or you should have dropped down to third gear... 
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01-05-2009, 06:12 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by Stentor
Something doesn't sound right with this scenario.... |
He could be on the level. Remember, there were a lot of mediocre truck FEs and stump pullers out there. You don't generally see them stuffed in to a Cobra though....  |
01-06-2009, 12:06 AM
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CC Member
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Join Date: Jun 2000
Location: Cape Town, South Africa/Mainz, Germany,
Posts: 1,601
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Not Ranked
Sorry to say, but that sounds like 250Hp in the Cobra...
Dom
__________________
If I don't respond anymore, that's because I can't log in
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01-09-2009, 07:15 AM
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CC Member
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Join Date: Jan 2008
Cobra Make, Engine: Unique
Posts: 153
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Not Ranked
not far off
It was advertised a 425 HP at crank. Dyno runs gave 270RWHP and after a carb change and some other changes only went up to 290 RWHP and 345RWTQ. I'll move this to a new thread later after I check some other things.
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01-09-2009, 07:24 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by diegokid
It was advertised a 425 HP at crank. Dyno runs ...290 RWHP and 345RWTQ.
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425HP at the crank with no mufflers, water pump, or any other accessories. Knock off 55 or 60 HP for the pipes, etc., and whack another 20% for the drive train and you're down to 290....  |
01-09-2009, 07:46 AM
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CC Member
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Join Date: Jun 2000
Location: Cape Town, South Africa/Mainz, Germany,
Posts: 1,601
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Not Ranked
Quote:
Originally Posted by patrickt
425HP at the crank with no mufflers, water pump, or any other accessories. Knock off 55 or 60 HP for the pipes, etc., and whack another 20% for the drive train and you're down to 290.... |
Please correct me, if I am wrong:
According to the above: 500Hp (80%) at the wheels result in 625Hp before the 20% drivetrain losses. Add losses for mufflers and accessories (55 to 60Hp) and the output at the flywheel is 680 to 685Hp.
Dom
__________________
If I don't respond anymore, that's because I can't log in
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01-09-2009, 07:52 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by Dominik
Please correct me, if I am wrong:
According to the above: 500Hp (80%) at the wheels result in 625Hp before the 20% drivetrain losses. Add losses for mufflers and accessories (55 to 60Hp) and the output at the flywheel is 680 to 685Hp.
Dom
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Yes, I think to get 500 at the wheel you'll need to be putting out in the hi 600's when the engine is out of the car and sitting on the dyno running free... maybe more. |
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