Finally got my XE262AHs installed in my 02 GT at a very reputable shop. The car idles well and gained right around 20HP in the process, seems to run really well otherwise and so on but...
One thing I noticed while poking around was that the engine has attained a sound characteristic that I can only describe as a "diesel" at idle. It's not really a "nasty" sound per se: no specific knocking or anything. Just a general "timbre" that reminds me very much of a diesel at idle. I can't really localize any one noisy area of the engine. It almost sounds loudest coming from the valley/intake manifold of all things.
As mentioned these are Comp XE262AHs and they were degreed. Although I also purchased the Comp springs, I was assured that the 262s do not need a spring upgrade and so decided to sit on the springs for now, leaving the factory parts in place. The sprockets, chains, guides, tensioner arms and just about everything else is brand new. I also had FRPP 24# injectors installed at the same time.
I also learned that what I thought was my previous best dyno of 268/313 was, apparently, hopelessly optimistic. Upon delivering the car to the shop, a dyno test showed only 250HP at the wheels in its "before" configuration. I had just come off the highway so I thought it might have been heatsoaked some but it appears that the dyno I've got showing those numbers was far from right. Perhaps in the spring (when it comes out of storage) I'll take it back to that optimistic dyno and see what it does. Anyway, after the cams and dyno tune it went to about 270HP with absolutely no loss down low.
I'm not too concerned about the diesel-like sound characteristic of the thing if it's making good power and otherwise not making any untoward noises but I'm curious if anyone else has any like stories to relate?
One thing I noticed while poking around was that the engine has attained a sound characteristic that I can only describe as a "diesel" at idle. It's not really a "nasty" sound per se: no specific knocking or anything. Just a general "timbre" that reminds me very much of a diesel at idle. I can't really localize any one noisy area of the engine. It almost sounds loudest coming from the valley/intake manifold of all things.
As mentioned these are Comp XE262AHs and they were degreed. Although I also purchased the Comp springs, I was assured that the 262s do not need a spring upgrade and so decided to sit on the springs for now, leaving the factory parts in place. The sprockets, chains, guides, tensioner arms and just about everything else is brand new. I also had FRPP 24# injectors installed at the same time.
I also learned that what I thought was my previous best dyno of 268/313 was, apparently, hopelessly optimistic. Upon delivering the car to the shop, a dyno test showed only 250HP at the wheels in its "before" configuration. I had just come off the highway so I thought it might have been heatsoaked some but it appears that the dyno I've got showing those numbers was far from right. Perhaps in the spring (when it comes out of storage) I'll take it back to that optimistic dyno and see what it does. Anyway, after the cams and dyno tune it went to about 270HP with absolutely no loss down low.
I'm not too concerned about the diesel-like sound characteristic of the thing if it's making good power and otherwise not making any untoward noises but I'm curious if anyone else has any like stories to relate?