Hi guys

I,ve just fitted a second hand Prodrive backbox and it's making a strange wooshing sound above 3k revs.I got my mate to do a fly-by and to be honest it sounds terrible.
It does make the normal,fairly muted bassy burble which we all know and love but there is also a noise which sounds like high pressure air being released.

Has anybody else experienced this or know whats causing it?

Also is it normal for the tailpipe to sit very close to the rear bumper(less than 1/2 an inch away)?.The bumper is getting quite warm after a run.

Thanks

Andy

 

I think that particular phenomenon is caused by a restrictive silencer.

/J

 

Andy

I must agree with the whooshing sound you have heard being not as nice as some exhaust sounds. I drove a PPP car a while back and I thought there was something wrong at first when I heard the noise on boost. I made a post about it but no one replied with agreement so I thought it was just me.

It was almost the same noise as opening a window a lttle at 100mph! I have heard most scooby exhausts as a passenger and driver and IMHO this was the only one I didn't like.

The oval Prodrive back box for the MY01's is a much better sound, I would go as far to say that it is the best I have heard so far. Pity they have changed the middle mounting point because I would have bought it for my car, just for the sound alone!

F
MY00.

 

I absolutely adore the sound of the PPP exhaust. It sounds very hi-tech which I quite like. Someone said it sounds like an F15 which may be stretching it a bit. Anyway, it works!!!!! VERY well. Although that might be the PPP. It is an absolutely insane bark above 4000rpm and I deliberately open the back left window to hear it. Fits in and takes over from the induction noise from K&N. Wonder what it will be like with DP?

 

This is what the P1 Prodrive backbox sounds like (nothing else changed)

 

Thanks guys

So how free flowing is the PPP backbox considered to be compared with the Scoobysport etc?
The main reason I went for it was to get a bit more bass without it being too loud on the motorway and around town, especially as I intend to change the downpipe when the warranty runs out next month.If it flows well then that would be a bonus.

I've also been wondering if using the PPP backbox on a uk car with the standard mid section may be altering its sound.Does anybody know if the center section fitted as part of the PPP has much effect on the sound?.

Looking at the backbox I can't work out why it makes the wooshing noise,as it is a straight through design unlike the standard backbox.Strange.None of the straight through exhausts I've had on previous cars have sounded like this.

Andy

 

Charlie

Please tell me your P1 engine had already been warmed up when you did that mp3
Nathan..

 

Prodrive have had a couple of different sounds.

On the old shape Scooby (excluding the P1) the sound was indeed a wooshing sound. Mike W at Prodrive probably heard the words "I prefer the SS sound".

Both the P1 and the MY01 do not woosh at all. They sound the same as a SS box, but with a little less db.

Jonathan

 

I've got the PPP conversion on a '98 car and love the exhaust note. Nice and burbly at low revs, Le Man prototype loud at + 4000 revs, perfect compromise. Other boxes I have heard are lovely and vocal at tickover then get louder and louder until they resemble, 'Nova-Boy', (OK with a touch more class). God knows what they must sound like in the car over a long journey, (thats a trip further than the high street and back).

 

AndyMc

Maybe you need the extra boost that comes with the PPP to liven it up

Regards
Richard

 

Andy,

I think the sound of the PPP at full howl is marvellous, you need to here it coming out of the mist on a twisty mountain road, it sounds like nothing else.

I have worked up from an SS backbox, to a straight through center and now have an SS downpipe and am now thinking of a different (quieter) backbox, I don't want to lose too much (any) of the performance and am thinking that a PPP backbox may be the answer.

Andrew...

 

They all do that sir....

Matt

 

have to agree with Jerry,

the whoosh sound is typical of a restrictive exhaust.

My BPM twister does exactly the same thing, but only with the bung in place to reduce the volume, and hence increaser the restriction.

 

See...even Adam has some knowledge.

/J