01 Drag

[Wild Bill]

My 01 svs drag runs great except when it is wide open. When I'm running down the lake 70-80 mph then floor it it changes pitch, kinda sounds ragged and feels like it is laboring. Needless to say i back out immediately. It runs sharp and sounds great if i stay just under wide open. I don't nail it very often because the xr02 is my lake cruiser and i don't go much over 100-115 and all you have to do is crack it open a little to get there.
Any ideas as to what to check out?
Thanks

[Capt.Insane-o]

Clean the MAP sensor fitting on the horn.

[tcrabtree]

Check air temp sensors with a ddt also.

[patchesII]

Check to make sure you have at 56 lbs of fuel pressure. Filters all good, vents clean and clear

[Wild Bill]

Thanks , Will check the map and air temp sensors. Thought i had a fuel problem last year so i ran around with a gauge zip tied to the boat but never saw it act up. But i will check again

[patchesII]

What fuel pump are you running

[Steve Pope]

Flooding injector?

[Wild Bill]

Running the stock pump, Think its a Walborough I haven't had time to dig up the paperwork. The pump motor Is on top of a 3x3 black aluminum block with a
Kinsler screen filter on the inlet. I have pinched the return line and it will make way more than 56 lbs . I have noticed sometimes when I turn the key on it will run longer than the normal 5-10 seconds before it stops , that made me think of the regulator but I haven't caught it acting up with a gauge.
Thanks again for all the ideas it will keep me busy when I get a day off sometime.
I guess it could be a bad injector, every time I have them cleaned it seams one needs replaced.

[Wild Bill]

Weldon pump?

[patchesII]

If you decide to get the injectors cleaned and checked out send them to Trae Appling here
http://www.injector911.com/

Checking the air temp sensor is a good idea too as was posted earlier. A DDT can tell you what it’s reading

[Capt.Insane-o]

....and a good fresh hot battery.

[texasvector]

if you dont have a ddt