I was reading a thread about chirping, but the focus was a manual. Im curious does the same hold true with an automatic. It was basically saying that, shifting lower in the RPM band cause more chirp because of higher torque and it its bad when racing to shift there.

I generally shift at about 5100 RPMS at the strip and it still get good chirp, should I hold out longer, Ive never got the car dyno tested where I actually peak at but Im sure it before 5500 RPM cause the intake stops breathing then.

Any and all opinions would be appreciated, thanks.

 

Maybe you should consider stickier tyres.

 

You can generally feel where your peak horsepower is because it feels like the car stops getting faster and it'll feel about the same or lag back a little further. Shift 200 rpms or so above where you think your peak power is. Chirping on an automatic...well, it can be bad. It kind of depends. When you force shift it...are you JUST moving the stick and thats it? Or are you changing the amount of throttle to force it? Throttle modulation = bad. That'll wear the tranny down quicker. But if the car just wants to chirp on its own...it's really not bad. Hell, that's what they do with shift kits. But like Vader said, stickier tires will eliminate that. If it's shifting hard enough to chirp the tires, and there's nothing wrong with the transmission, that's pretty good then! The chirpier, the harder. The harder, the quicker. The quicker, the faster.

 

i think the idea about chirping the tires is that if in a manual you shift slowly and let the rpms come down too much it will chirp when you shift gears. This is because down low you have a lot of torque but not much horsepower. I believe the chirp your reffering too is just it breaking the tires loose for a second when you shift. How low do the rpms drop to when it shifts?

 

What I do to chirp the tires:
If im at 30-40mph, powershift down to first.
60-70, powershift down to second. I get more of a chirp goin at 30mph

 

pretty much regardless of where you shift with a quick shifting auto itll probably chirp the tires since the engine is being forced to suddenly change angular velocity. Softer tires will eliminate that since theyll be less prone to loosing traction. I have tires with a wear rating of 150 and they dont squeel at all, ever. Theyre too soft. That still doesnt stop them from breaking loose and smoking real hard on a quick 2->1 downshift, even with the highway gears. But they sure are sticky non the less.

 

150?? Whewee buddy, what tires are ya running? I've got some Cooper Cobra ZHP-01's with an AA for traction, A for temp, and W-rated, and they've got a treadwear of like 275! You must have some hardcore rubber....

 

a set of yokahama avs intermidiates. Theyre oldies but i got them for 175 for 4 of them. They have that really low wear rating of 150 (or is it 160?). Anyway, they are very soft and they damage easy. Things like rocks and what not will gauge them if im not careful about how hard i take corners. And they also smoke like hell when they spin. Did i mention they damage easy?

 

Lol yeah...I find small pebbles and things embedded in mine if I'm handling hard...they normally arent very sticky, but they are fairly soft. But if you take just a few sharp corners on them and they heat up, they get very sticky and grippy. It's great. They're only sticky when they need to be. The tread pattern is good too...clears water out nicely. Theyre very barky, noisy tires until you get 1/2 down on tread, then they go silent.