Coyote + JMS = Sweet!

[Davidbr_48]

I am happy to report that my Coyote is now running well. I tried each of the three tunes that JMS provided and - surprise! - liked the "Max Power" the best. The engine runs smooth and even, and beyond 3,500 rpm really starts pumping out the power. Until about 3,200 rpm the exhaust note is a deep rumble, and beyond that it gradually changes to a louder "blaaat" -- enough to let people know this isn't a Buick, but not painful or sharp.

Note - I ran my exhaust under the car and am using a customer muffler and pipe setup from Stainless Headers. I also installed baffles from Car Chemistry downstream from the muffler. These probably eat up a few hp but I've got more than enough as it is. I'm beginning to feel more comfortable in the car - now have about 150 miles. Not quite ready to take guests out for a ride yet, but at least I'm not scared of the car anymore. Yes - I respect it, but no, I'm not terrified (like I was the first time I drove it....)

Davidbr / Tucson

[ClemsonS197]

Is the stalling and stumbling gone? What do you idle at? Glad to hear of the progress.

[DaleG]

David, is this with or without the Speed Dial?

[Davidbr_48]

No speed dial. Stalling problem gone. Idle is low - will check. On acceleration is smooth. Had a stumble around 3800 rpm early on, but may have been because engine was cold. After 15-20 min, engine responded at virtually any speed without stumbles. A few backfires on deceleration. Big, big improvement vs performance with factory tune. It tickles me that a "tune-up" means a software update....

[DaleG]

Could you explain to me how the JMS tune works? Contact #, who to talk to, info they require, what they send and how to install the tune(s); is it something I can easily do?, cost.

Cheers, Dale