Think CAM Grind too Lumpy for Idle ?

[teamzr1]

Ignore the crappy video camera output and also exhaust was too loud for the camera mic

Think too much lope at idle ?

Let's Go a Racing, Boys !

 

[Roscobbc]

Sounds like its idling at about 1200 rpm?

 

[teamzr1]

I program tune for 850 RPMs to maintain Idle as that helps make up for loss of vacuum due to the narrow 112 LSA of CAM

 

[teamzr1]

Sounds like its idling at about 1200 rpm?

See if this is better
I did this custom exhaust in 2008 so seeing how much the small bullet mufflers are functioning of sound changed
I used a better video camera, moved the exhaust tips outward 2 inches so sound no bouncing under the car
and get the fuel injectors via a tune to run the AFR bit richer for warmer weather
Testrun is 30 minutes at mostly legal speeds as to see what the Dba is at low speeds and how the hearing is after this time

See what you all think ?

 

[Roscobbc]

I guess a 'lumpy' cam used with a programmed MPI system helps take the edge of any roughness......drive-out certainly seemed acceptable in terms of cabin noise although most camera don't really pick-up the whole frequency range and higher and lower pitched noises are often missed (as is resonance) you'll still hear irritating banging and crahing from the body though! - what speed we you doing there Jon? - 50/55mph? - not using 6th much?

 

[teamzr1]

Yes that is correct
Due to loss of low to mid-RPM end vacuum due to narrow LSA a positive of having a PCM is can overcome some of that low vacuum commanding idle RPMs, timing and commanding length of time injectors are commanded on

Testrun was recorded with OBD-II scanner and this chart shows the average of RPM and MPH for all each of the 22 engine cells

Yes, I kept speeds down to record normal driving as to exhaust Dba, so almost no 5th and 6th gears