Mob inspired me

[88 Fox GT]

As with the induction tract, if you go TOO large then you'll get lazy air within the exhaust plumbing. What's most desirable is having an exhaust system where the spent gasses from one cylinder are assisting to help "suck" the gasses from the next firing cylinder, out of the exhaust system. Tuning the exhaust perfectly to keep those exhaust gasses at high speed keeps the venturi effect of the expended exhaust moving quickly out of the tail pipe.

That's what I've read is that if your exhaust is too large or too free flowing, then it will have a backwards vacuum effect and doesn't help to get the gases out as much.

I just think of it as the engine being an air pump, which, essentially, it is. So, it's all about pressure. For instance, a very mild 5.0 is going to have more pressure to help get exhaust gases out with 2.5" exhaust pipe vs 3" exhaust pipe. Now, if you have a heavily modified 408 stroker or something, it's going to be making a ton more exhaust gas and will have enough pressure to be able to use 3" exhaust efficiently.

 

[Daggar]

That's what I've read is that if your exhaust is too large or too free flowing, then it will have a backwards vacuum effect and doesn't help to get the gases out as much.

I just think of it as the engine being an air pump, which, essentially, it is. So, it's all about pressure. For instance, a very mild 5.0 is going to have more pressure to help get exhaust gases out with 2.5" exhaust pipe vs 3" exhaust pipe. Now, if you have a heavily modified 408 stroker or something, it's going to be making a ton more exhaust gas and will have enough pressure to be able to use 3" exhaust efficiently.

I understand what you're saying and agree. I think where this topic gets boogered up is in the term "pressure". The term we SHOULD be using is "volume" where your description of the effect is concerned.

 

[dragnazz5.0]

bullets sound good, i had them for about 6 months and than changed to one chamber flows, and now i have spintech pro streets and couldnt be happier. but for the price you cant beat the bullets

 

[88 Fox GT]

I understand what you're saying and agree. I think where this topic gets boogered up is in the term "pressure". The term we SHOULD be using is "volume" where your description of the effect is concerned.

Yes, volume is probably the proper description of what I'm trying to say.

 

[Daggar]

Good! Now that we have that settled. Beer me!

 

[88 Fox GT]

Good! Now that we have that settled. Beer me!

 

[manny]

hey mob and Daggar sorry for the shots I toke just had a bad day I cant figure out this boost this so sorry

 

[Daggar]

hey mob and Daggar sorry for the shots I toke just had a bad day I cant figure out this boost this so sorry

No prob bro... I have bad days too.

Hope things come together for you on your car.

 

[manny]

I'll keep trying I just put it in and drove it saw no boost just vac

 

[Daggar]

Hmmmm... take a little time to gather your thoughts and get it all into a tech thread.

What it is.
What it's doing.
What you done and tried so far.
Your combo (of course).
What size pulley and the amount of expected boost from that pulley on that unit.

If you have a regular sized blower pulley but are running an under drive crank pulley, you can actually end up trying to "suck" air through the blower at idle and part power because the blower is not moving enough air. I've seen that once or twice on some smaller units.

 

[Daggar]

Hey Manny... I moved your posts over to a new thread in the TECh section Labeled "V1-SC Install but no boost!"

Hope to get more attention to your problem there and a solution.

 

[Blk91stang]

Hey Manny... I moved your posts over to a new thread in the TECh section Labeled "V1-SC Install but no boost!"

Hope to get more attention to your problem there and a solution.

I addressed his problem which hopefully is a solution. Get R' Done!!!

 

[Daggar]

I addressed his problem which hopefully is a solution. Get R' Done!!!

Great! Glad we could help.

 

[manny]

yup thanks for the help