hey guy, my friend has a v6 firebird and yesterday he was messing around with it doin burn outs and basicaly see what she has, him and i notce that sometimes it would shoot black smoke out the exhaust. another friend of mine has a pickup and his would do the same thing, even my old v6 firebird did it>but only if u were beating on the car seeing what she has. anyway i was just wondering y it does that??

 

if its black smoke, its just running a little rich, no biggie.

 

What he said. Also a lot of older cars have weak ignition systems and when they're beaten around up in the higher rpms, they can drop spark, which gives an incomplete burn, so I imagine it lets off a little black smoke from that too. Well that's my THEORY anyways.

 

also the car may not have been dirinvin that hard in a while and the carben bildup what blown out when the motor was at high rpm.

 

kool thanks for the replys.
hey another question its a good thing to get on your car sometime right?

 

lets put it this way...if i'm not 'on it', i must not be driving it!

 

Just don't be pushing those colors on the tach too often and you'll be fine.

 

what colors??...there's a needle in the way!

 

Whats the highest youve taken yours anyways, out of curiosity?

 

the tach will show me 6,000 easily.....when i had it on the dyno, their computer was showing fewer.

 

Yeah, factory tachs suck. But I'd rather the tach be over than under. Most I got my tach to read EVER was 6500 on the old motor. The new motor I pegged at 6200 once when I burned through a gear real bad.

 

yea, i want to hook an aftermarket tach up sometime. i wanna take some video of a full blown street run sometime. i don't want to hear about 'it has 4.10s though...' trust me, it spun about the same after i put the posi and 4.10s in as it did before with the open 3.23...now but tires are spinning though.

 

This can also happen when there is too much oil in the engine. I've had it happen in my dad's Chev pickup when shifting.

 

normally when I'm off street racing, I shift at about 5000RPMs. Normal driving, I usually shift at about 3800RPMs

 

kool thank guy. since we r on the rpm topic, what would be to high of a rpm to shift at? i am always afraid to bring the rpms up to high i dont wanna blow nuthin lol....at what point do u guys recomend shifting at when raceing?

 

If I remember right, these V6's, stock, make their peak hp around 4600 or 4800 rpms or so. So I'd recommend shifting at maybe 5200. There's not much of a point in revving these motors up high.....they're not imports, they don't make power up there. So when you're racing you never need to come anywhere close to anything that could damage your motor...unless you're doing a top speed race.

 

Depends on the motor... 2.8's powerband seems to be 3,000-5,000; 3.1's seems to be 2500-4500 (stroker).

Highest I've taken mine intentionally has been 5600... I try never to go higher. Did it about a year ago- I thought i was in second, and shifted up twice to get into overdrive. Yeah, well I was really in 3rd, and wound up shifting into neutral! All I heard was a hell of a scream from my motor, and some backfiring, so I let off the gas. I'm pretty sure my MSD box's rev limiter (6AL, using 6000 chip) kicked in, thank gawd.

 

i run 6000 all the time with a stock bottom end. haven't had any problems with that.