Variable geometry on 1998 Cobra

98SVTSnake · 03-17-2009

I'm feeling a surge in my car

. Is this normal to feel the variable runners open and close? It seems to happen at the right rpm about 3200. I just cleaned the MAF and the throttle body. I stalled new spark plugs. everything seems to be in good shape. Just like to know if that is what it is or something else I need to look at.
thanks for any help

1S1K · 03-17-2009

i have noticed the same around 3k RPMs where she hangs then lets go. i just got my wires and plugs in and will check it out over the weekend. i was explined my issue could be the stock wires at 115k.

98SVTSnake · 03-17-2009

Quote:

Originally Posted by 1S1K

i have noticed the same around 3k RPMs where she hangs then lets go. i just got my wires and plugs in and will check it out over the weekend. i was explined my issue could be the stock wires at 115k.

Will mine has only 83k on it and my wires look good.

Just seems a little strange that it happens at the rpm that the runners open

and that its happening on your car to

It's not a big deal but I want to make sure that it's not something that could be come bad. thanks for your input

let us know if went away or not and again thanks

2Manystangs · 03-17-2009

Yeah it's normal, I've felt that for years on my 1996 cobra, kinda feels like an old 4 barrel carb hitting the secondaries? Same principle, Ford staged the intake on these cars

98SVTSnake · 03-17-2009

Quote:

Originally Posted by 2Manystangs

Yeah it's normal, I've felt that for years on my 1996 cobra, kinda feels like an old 4 barrel carb hitting the secondaries? Same principle, Ford staged the intake on these cars

thanks thats what I thought to but just wanted to be sure

thanks for the help

2oo5GT · 03-18-2009

My friend's 96 cobra, during his dyno tune, they said they were opening/closing at the wrong times, after they fixed the issue, his car responded alot better.

1S1K · 03-21-2009

svt, I am sorry i guess i spoke outside my lane....

my neighbor and I did the tune up yesterday. OMG night and day diffrence. There is no hang time and she goes all the way to cut off without delay. I am so happy with the new plugs and wires. I understand about the runers opening at those rpms.

Thanks for your support and great information.