major power loss
01-07-2006, 04:34 AM
#1
Thread Starter
Join Date: Oct 2005
Location:
Posts: 37
major power loss
I've had my 99 cobra for about 4 months now. after having some ****ty runs at the track I changed the bosch platinum 2's that came in the car to platinum 4's (ngk tr55's weren't available in town), and changed the fuel filter and added a CAI. times improved, but were still pretty bad for a cobra.
2 weeks ago I noticed that above 6000rpm the car falls on it's face and barely climbs after that. this week the car still has the same problem... but now the power seems to go up and down throughout the power band. My co-worker beat me pretty bad in his Porsche Cayenne Turbo SUV... and then tonight I was getting beaten by a MAZDA 6 from about 45 - 90mph, which clued me in that something is definately wrong and it's not just in my head.
Any suggestions on what the cause could be? I did a compression test before these problems began occuring and it was around 160 across all cylinders. I will be doing another test tomorrow, as well as getting new plugs.
2 weeks ago I noticed that above 6000rpm the car falls on it's face and barely climbs after that. this week the car still has the same problem... but now the power seems to go up and down throughout the power band. My co-worker beat me pretty bad in his Porsche Cayenne Turbo SUV... and then tonight I was getting beaten by a MAZDA 6 from about 45 - 90mph, which clued me in that something is definately wrong and it's not just in my head.
Any suggestions on what the cause could be? I did a compression test before these problems began occuring and it was around 160 across all cylinders. I will be doing another test tomorrow, as well as getting new plugs.
01-07-2006, 04:36 AM
#2
6th Gear Member
Join Date: Nov 2005
Location: Clarksville TN
Posts: 6,828
RE: major power loss
What kind of times were you getting at the track? I believe the 99 Cobra's had alot of problems, and yours is a vert, so your probably lookin at high 13's in the 1/4.
And the new Mazda 6's have a 2.3L Turbo pushin about 273 at the crank. Might have been one of those.
And the new Mazda 6's have a 2.3L Turbo pushin about 273 at the crank. Might have been one of those.
01-07-2006, 04:50 AM
#4
6th Gear Member
Join Date: Nov 2005
Location: Clarksville TN
Posts: 6,828
RE: major power loss
14.6 does seem kinda slow, and your trap speed is way down from what it should be. I think it should be over 100. Not sure though. Are you sure your not runnin on only 7 cylinders or maybe you just have a lemon. Not tryin to bring your hopes down and make you upset, but seems like something serious is going on.
01-07-2006, 05:07 AM
#5
3rd Gear Member
Join Date: Sep 2005
Location: Washington State
Posts: 938
RE: major power loss
How good at drag racing are you? It's not uncommon to lose a 1/2 sec or more from poor launches etc. How many miles are on the car and do you have any mods?
Those Mazda 6's are supported well by the aftermarket. Just lick your wounds and choose your battles a little more wisely next time. The porshe cayenne turbo has 450hp. There is probably nothing wrong with your car.
Those Mazda 6's are supported well by the aftermarket. Just lick your wounds and choose your battles a little more wisely next time. The porshe cayenne turbo has 450hp. There is probably nothing wrong with your car.
01-07-2006, 08:08 AM
#6
4th Gear Member
Join Date: Nov 2005
Location: FLORIDA
Posts: 1,536
RE: major power loss
I think there has to be something wrong with the car. W/ street tires on my 2004 GT I ran a 14.5, dont remember the speed. This was my VERY FIRST time out with this car, first time at the track with a 5speed ever. So, there's something wrong somewhere. Now a 99 is the bad year for the Cobra and the vert does add a few lbs.
01-07-2006, 12:24 PM
#8
4th Gear Member
Join Date: Aug 2003
Location: United States
Posts: 1,974
RE: major power loss
99 cobra's suffered from performance issues. Ford/SVT released a fix for it. One was the replacment of the intake do to casting slag left in the back corner of one of the rear runners and the other was a exhaust set-up change. There is a rason they didn't make Cobras for a year or two because of the lack in performance.
i woul hit up a ford dealer to see if that fix had been done to the car.
LOSE the Plus 4's There are some of the WOREST plugs for our cars. I would look into a set of Iridums from NGK or Denso. They don't shield the spark like a +4 plug does.
i woul hit up a ford dealer to see if that fix had been done to the car.
LOSE the Plus 4's There are some of the WOREST plugs for our cars. I would look into a set of Iridums from NGK or Denso. They don't shield the spark like a +4 plug does.
01-07-2006, 01:40 PM
#9
5th Gear Member
Join Date: Feb 2004
Location:
Posts: 2,028
RE: major power loss
ORIGINAL: ourformerselves
I've had my 99 cobra for about 4 months now. after having some ****ty runs at the track I changed the bosch platinum 2's that came in the car to platinum 4's (ngk tr55's weren't available in town), and changed the fuel filter and added a CAI. times improved, but were still pretty bad for a cobra.
2 weeks ago I noticed that above 6000rpm the car falls on it's face and barely climbs after that. this week the car still has the same problem... but now the power seems to go up and down throughout the power band. My co-worker beat me pretty bad in his Porsche Cayenne Turbo SUV... and then tonight I was getting beaten by a MAZDA 6 from about 45 - 90mph, which clued me in that something is definately wrong and it's not just in my head.
Any suggestions on what the cause could be? I did a compression test before these problems began occuring and it was around 160 across all cylinders. I will be doing another test tomorrow, as well as getting new plugs.
I've had my 99 cobra for about 4 months now. after having some ****ty runs at the track I changed the bosch platinum 2's that came in the car to platinum 4's (ngk tr55's weren't available in town), and changed the fuel filter and added a CAI. times improved, but were still pretty bad for a cobra.
2 weeks ago I noticed that above 6000rpm the car falls on it's face and barely climbs after that. this week the car still has the same problem... but now the power seems to go up and down throughout the power band. My co-worker beat me pretty bad in his Porsche Cayenne Turbo SUV... and then tonight I was getting beaten by a MAZDA 6 from about 45 - 90mph, which clued me in that something is definately wrong and it's not just in my head.
Any suggestions on what the cause could be? I did a compression test before these problems began occuring and it was around 160 across all cylinders. I will be doing another test tomorrow, as well as getting new plugs.
01-07-2006, 01:52 PM
#10
5th Gear Member
Join Date: Dec 2005
Location: Okla.
Posts: 2,060
RE: major power loss
Are you getting anything besides lower power? Any shuddering at all? Plugs, wires, fuel filter, air filter... if none of that fixes it, do you still have stock exhaust? Coulda got some bad gas and have some clogged cats.. it doesnt take very much crud to clog up the waffle cone crap in there.