Is a 3" S Steel exhaust on a Rangie V8 a good idea?

[Peterc5561]

Can someone please tell me if a 3" stainless steel exhaust on stroked 4.7lt V8 with headers is a good thing or not?

It mounts from where the two front pipes join the main single pipe, which was a 2.25".

Would there be any performance gain? Apart from the sound:p!

Or would it be a total waste of time and money?

If its not good, then from other peoples experience, whats the best setup to have for a stroked V8 4.7lt?

Thanks Pete

[stirlsilver]

if it was a waste of time for a stroked 4.7L V8, what was it for my friend who has a 2L 4 cylinder!!! I would say it is adequate, since I am running 3.5 standard engine on two 2" systems. I'm sure someone who has done it will be able to tell you if they found an increase in performance... Just my two cents :p

[PhilipA]

I reckon it would only give extra performance at the very top end say over 5000RPM, and it would be noisier and dronier than say a 2.25-2.5 at all lower revs.
Regards Philip A

[HAK]

You could do 3 but boy would it be noisy (I cant believe I just said that) and as stated top end performance mainly i wouldn’t go more then a 2.5 and perhaps straight through mufflers that will give you noise and better back pressure

[Peterc5561]

Thanks Guys, I take it that it's a waste, the 4.7lt dosen't like to rev much over 3000 revs. I think it is because the motor is stroked.:( It has heaps fo low end torque:twisted:

I need to make a decision by 10am tomorrow, its 2nd hand and will cost about $500. I had thought it was good value, but not if i dont gain anything except an exhaust that wont rust!:p and a deep noise:cool:

Unless anybody has anything else to add?

[PhilipA]

Remember the ports are geared for 3.5 litres. To get top end in a big motor you need to open them out , strangely enough particularly the exhaust ports.
Regards Philip A

[Grimace]

3" will be fine for a 4.7L
But i would still only run a 2.5"

Def looking into the ports as these motors love to rev and if you think its struggling over 3000rpm something isnt right.

Its should be ball tearing all the way to atleast 5000rpm

Cheers
Anthony

p.s. How did you go about stroking the motor originally?

[Peterc5561]

Grimace, Anthony,
I bought the Rangie about two years ago. The previous owner had the engine overhauled and stroked by Ritter’s in Melbourne, at the same time the heads where overhauled and set up for unleaded fuel.

Is it true that a stroked motor likes to rev high? Because mine defiantly doesn’t! :o

I dont mind as the low end torque is just the best.:D

Thanks Pete

[p38arover]

My old '86 RR with a 4.6 (and heads with bigger Chev valves) had a 3" stainless steel exhaust - it was all done by John Davis Motorworks for the previous owner.

It had a nice note but I wouldn't say it droned or was uncomfortable as far as noise goes - and I'm one who like s a quiet car. I did a number of long trips in it and drove it daily to work (60km each way) for 5 years.

Ron

[Peterc5561]

Thanks Ron, did your 4.6, with the 3" rev high, or strugle?

[p38arover]

It never struggled! It gave a lot of GTi drivers a bit of a surprise. It also had bigger injectors and a Haltech EFI computer.

Ron

[tombraider]

Thanks Ron, did your 4.6, with the 3" rev high, or strugle?

Mate, either the heads are choking the thing...

The inlets restricted way to much

The throttle cables not adjusted enough...

Your mufflers baffles have collapsed...

Or they indexed the camshaft wrongly....