Bosch Fusion Spark Plugs

[DavidPIL]

Hey all...I had commented a year ago in this thread http://forums.genvibe.com/zerothread?id=27424, about my experience with the Denso plug upgrade from the original SK20R11's to the IK20's. Mentioned that I didn't notice much other than a slight improvement in the idle and a possibe slight decrease in mpg.Last week, since I was just about at the 30,000 mile mark for the last plugs, I decided to try the Bosch Fusion plugs (Bosch #4501). I must say that these were a major improvement over the IK20's. Almost to the point where I have to believe that I had a bad plug before. Very smooth idle, very smooth acceleration. The engine even sounds different... quieter... quiet to the point that I notice the valves clicking much more. I also seem to have more torque when starting off in 1st or doing a "pepsi-pause" stop 'n go in 2nd. The engine doesn't bog down nearly as much.Definitely worth considering if you're about to change the plugs. Dave

[BlueCrush]

They are iridium so it sounds like they might be worth trying out. Where did you get them? How much were they? Thanks

[DavidPIL]

Hi BlueCrush...I should have mentioned that. I got mine at Advance Auto for $43.01 for the set. I was going to try these then fall back to the NGK's if these didn't help. In the thread mentioned above, since changing the plugs to the Denso's IK20's I had a decrease of about 2mpg average. I also got new tires at the time, wider 245/45 so that could have helped loser the mpg. I still have those tires so now I can see if it was the plugs or the tires that caused the decrease.Dave

[joatmon]

those have an interesting tip

Attached files

[JesseWHHS]

I also upgraded to these exact plugs. My dad got them for free from a contest at his job. They didnt make them for his car or my moms. But they sure did make them for the 03 Vibe. haha.Anyways I took the old ones out, they were Denso's. My dad said they were also how high output plugs. I didnt notice any change really. I still get **** gas mileage though. 20 MPGs cause I drive like im 18.... which I am. lol.But yeah, no difference that I can tell so far. and ive had them for a few months now.

[DavidPIL]

Hi Jesse,Do you have a GT, Base or AWD?Dave

[Sublimewind]

I have a friend that is a mechanic, said he wouldn't put Bosch anything in a car, even if it was GW Bush's car...