Not bad at all for a car that will have great driveability and plenty of power as soon as you roll into the throttle!
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By posted figures I'm refering to the GM's 400hp/400lb/ft of torque. Like I said I'm sure they're "biased" more towards the 400 mark, but I wouldn't expect such low stock dyno figures.
I would say 356rwhp is pretty darn good for a stock 05. But still, if both runs were on the same equipment, I would think that that's more important to know, rather than what type of dyno was used. Just my 2 cents.
Something is definitely wrong with the base numbers. But first remember "base" does not mean "stock". Base is just the first run that is being compared to all others runs after. If 356.2 rwhp was stock that's showing just an 11% drivetrain loss. 11% is kinda low! And 317.5 on the rwtq is just over 21% drivetrain loss. 21% is definitely high! 11% and 21% drivetrain loss on the same run :confused Something is truly wrong with this info.
GM rates hp at the flywheel. There is usually about a 15% loss for 6 speed cars so that would put the rear wheel hp at about 340. Most stock dyno numbers that I've heard of have been in the 345-355 range so 356 is pretty much on par. Some stock cars will make more horsepower than others so a 10hp difference is no big deal. The LS1 cars were underrated. They were rated at 320hp at the flywheel but the 6 speed cars would dyno in the 290-300 range at the rear wheels.
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GM rates hp at the flywheel. There is usually about a 15% loss for 6 speed cars so that would put the rear wheel hp at about 340. Most stock dyno numbers that I've heard of have been in the 345-355 range so 356 is pretty much on par. Some stock cars will make more horsepower than others so a 10hp difference is no big deal. The LS1 cars were underrated. They were rated at 320hp at the flywheel but the 6 speed cars would dyno in the 290-300 range at the rear wheels.
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This is definetly a flawed test, 4 months apart, 500 miles on the car for the first run (base line).
Max power is taken at 500 rpm higher in 2nd test.
Mustang Dyno W/O vehicle weight programed in and who knows what other parimeters were left out?
Looks like Dyno Jet numbers to me, but then all GM numbers are at the flywheel on a Dyno Jet.
An intercooled Magnuson should make around 450rwhp with a 6.0 and 3.55 axle ratio on a Mustang Dyno, and will be very impressive on the street.
What I'd like to see is a good comparison with a centrifugal supercharger on a Mustang dyno with the proper programing. :cheers
hey guys, there's some metal like sludge in the engine of my 400!!its in a 1970 GTO . the reason i opened up the oil is that i saw oil mixed with water and stuff under car after a day of driving.opened up the pan and saw this!!!
any input guys?
Thank you
I have a non matching numbers 1970 400 gto and I’m wondering if anyone has fitted a shaker scoop off of a 1970 trans am to one before and does the hood cut out take out the ram air scoops at all? Ok I guess that no one on here wants to answer a legit question from Australia
I have lost my key to my 2004 GTO, I have a new blank key & fob, but every locksmith I have talked to “can’t find the code”. I purchased it used so I never had the card with all the codes, who can I go to to get them or where can I find them? Thanks in advance.
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