measured my redline

Streetglow · Post by **Streetglow** » Tue Jun 21, 2005 2:10 pm

Using an acoustic tachometer.

1st test: my car (aka beater #1)
Acoustic Tach: 1474RPM
OBDII Onboard computer: 1485RPM

so, it's somewhat accurate.

2nd test: '86 Honda Spree
Based on the acoustic test only: 5937RPM
So, the redline is probably 6000 and mine just can't make it there any more since it's ancient.

87 Octane btw

Post by **noiseguy** » Tue Jun 21, 2005 4:03 pm

How fast is it going at that RPM?

Streetglow · Post by **Streetglow** » Tue Jun 21, 2005 4:24 pm

I had it up on the kickstand to do the test. but I can only hit that rpm going down hill

usually it hits at about 40mph.

Post by **noiseguy** » Wed Jun 22, 2005 9:33 am

? Honestly, that sounds slow. Is that "acoustic tach" tuned for a single cylinder 2 stroke? The reason that I ask is that a single cylinder 2 stroke "pops" at every revolution, whereas a single cylinder 4-stroke "pops" at every two.

I think the redline on the stand is probably more like 12,000 at 40 MPH. On level ground, at about 30 MPH, the Spree should be turning around 8000 RPM.

burnt_toast · Post by **burnt_toast** » Wed Jun 22, 2005 11:09 am

yeh, 2strokes are supposed to rev a lot more than that at top-end.

vette76 · Post by **vette76** » Wed Jun 22, 2005 11:49 am

thats how i understood it.i should just go out and buy a 2 stroke tach.