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Removing centre silencer on Rover V8
Might be a question for JC this one.....
Been toying with the idea of removing the centre silencer from my Range Rover V8 and replacing it with a straight through pipe in order to let it flow better and give a richer sound. The car would then just have the rear silencer (and it's a non-Cat model).
So, is it worth the expense/hassle and will it really give any extra performance? I would like the exhaust note to be a bit louder, but wouldn't want it to be overbearing.
Any ideas appreciated.
Been toying with the idea of removing the centre silencer from my Range Rover V8 and replacing it with a straight through pipe in order to let it flow better and give a richer sound. The car would then just have the rear silencer (and it's a non-Cat model).
So, is it worth the expense/hassle and will it really give any extra performance? I would like the exhaust note to be a bit louder, but wouldn't want it to be overbearing.
Any ideas appreciated.
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Range Rovers like yours are typically very well silenced. Infact, at idle they are virtually silent.
The biggest limitation on your engine are the crappy cast RR manifolds. The flow rates must be awful. just look at the shape!
There would be a slight improvment in performance but to be honest you arnt going to notice it. What will be noticeable is that it will be significantly louder throughout the rev range and will have a little bit more of a "crack" to the exhaust note.
If its a bigger sound you want, then by all means go for it.
If you want to boost your performance then you'll need to spend a couple of hundred quid on a new set of manifolds. What compression ratio is the engine? It'll be stamped on a little plate next to the dipstick CRXX.X:1 @@@@@@ with "@" being the engine number.
If you cant find it there then it might be on the little ear up by the bellhousing near the left bank.
Getting good performance out of these old rovers is all down to the heads.
I'll be spending around a grand on heads for my 4.6
What I would do is take the middle box off and then take it to a place with a mandrel machine and get them to make up a pipe based on the dimensions of the silencer. It'll cost you about a tenner for the pipe and maybe another fiver in exhaust clamps.
The biggest limitation on your engine are the crappy cast RR manifolds. The flow rates must be awful. just look at the shape!
There would be a slight improvment in performance but to be honest you arnt going to notice it. What will be noticeable is that it will be significantly louder throughout the rev range and will have a little bit more of a "crack" to the exhaust note.
If its a bigger sound you want, then by all means go for it.
If you want to boost your performance then you'll need to spend a couple of hundred quid on a new set of manifolds. What compression ratio is the engine? It'll be stamped on a little plate next to the dipstick CRXX.X:1 @@@@@@ with "@" being the engine number.
If you cant find it there then it might be on the little ear up by the bellhousing near the left bank.
Getting good performance out of these old rovers is all down to the heads.
I'll be spending around a grand on heads for my 4.6
What I would do is take the middle box off and then take it to a place with a mandrel machine and get them to make up a pipe based on the dimensions of the silencer. It'll cost you about a tenner for the pipe and maybe another fiver in exhaust clamps.
Dac_10
why would you want performance on a RR anyways?
Giving it the berries off-road. Why else?
The best heads you can get for a Rover V8 come off a 4x4.
Ever heard of a Bowler Wildcat? Wildcat heads are mental.
The valves are massive and the ports wafer thin!
The only heads that might come close are the brand new Real Steal Merlin heads just gone into production after 5 years R+D.
Cool, thanks for the advice JC. To be honest, for what will amount to around £20, I might give it a shot - can change it back easy enough if I don't like it.
Compression ratio is 9:35:1 according to handbook. There's quite a few mods that I'd like to do (full stainless steel freeflow exhaust would be nice...) and as you say, heads as well. Not sure I can justify the expense at the moment though with university approaching; especially since the RR's only worth £1500ish! Might also get a less restricting air filter on it - the standard one is horrid and very restricting (just look at this picture!)
Compression ratio is 9:35:1 according to handbook. There's quite a few mods that I'd like to do (full stainless steel freeflow exhaust would be nice...) and as you say, heads as well. Not sure I can justify the expense at the moment though with university approaching; especially since the RR's only worth £1500ish! Might also get a less restricting air filter on it - the standard one is horrid and very restricting (just look at this picture!)
What induction are your running again? EFi wasnt it?
if it is EFi, have you considered fitting the optimax chip from RS? Think its about a hundred notes now?
Its a pity you dont have the low CR engine, i was going to suggest some nitrous. You cant run nitrous on a 9.35:1 block unless you space the heads away from the block with composite gaskets to bring the CR down... you get detonation otherwise and end up with melted plugs or worse, a melted piston!
if it is EFi, have you considered fitting the optimax chip from RS? Think its about a hundred notes now?
Its a pity you dont have the low CR engine, i was going to suggest some nitrous. You cant run nitrous on a 9.35:1 block unless you space the heads away from the block with composite gaskets to bring the CR down... you get detonation otherwise and end up with melted plugs or worse, a melted piston!
Yep, EFI on a 3.9L. As it happens I was looking at the Optimax and Tornado chips on RPI's website today, but they're closer to 300 notes. Who are RS and is it the same chip?
Nitrous would be interesting - know a few people who've put it on their 3.5L and it's really quite funny to watch them fly around offroad. Would love to see the reaction from my insurance company if I say I've fitted NOS to a Range Rover!
Nitrous would be interesting - know a few people who've put it on their 3.5L and it's really quite funny to watch them fly around offroad. Would love to see the reaction from my insurance company if I say I've fitted NOS to a Range Rover!
Sorry, it is RPI that do the chips isnt it?
Real Steel (RS) are a company based in bucks. They specialise mostly in mopar stuff for big boys. infact the Rover V8 only gets 4 pages in their whole catalogue!
http://www.real-steel.demon.co.uk/
i use them for ARP fittings and so on they do good race spec bearings for the old rover too. They arnt cheap but their stuff is good and its always here when i want it.
The problem with nitrous is that the CR needed to run it means a drop in power for general use. IF you had the CR8.5:1 block then it wouldnt matter... it already runs round with not much power anyway. The Stiff block 9.35 3.9 litre is a very good engine. Its a small journal block for starters so it will actually rev (as much as V8's rev anyway)
What do you use your Rangie for anyway? You into offroading in a big way i guess?
Real Steel (RS) are a company based in bucks. They specialise mostly in mopar stuff for big boys. infact the Rover V8 only gets 4 pages in their whole catalogue!
http://www.real-steel.demon.co.uk/
i use them for ARP fittings and so on they do good race spec bearings for the old rover too. They arnt cheap but their stuff is good and its always here when i want it.
The problem with nitrous is that the CR needed to run it means a drop in power for general use. IF you had the CR8.5:1 block then it wouldnt matter... it already runs round with not much power anyway. The Stiff block 9.35 3.9 litre is a very good engine. Its a small journal block for starters so it will actually rev (as much as V8's rev anyway)
What do you use your Rangie for anyway? You into offroading in a big way i guess?
Excellent, thanks for the link. The RPI chips are a bit much for me at the moment unfortunately.
Use the Rangie for everything - love off-roading, but don't get to do it as often as I'd like (go up to Salisbury now and again and might go to Ireland with a few mates at Christmas). There's a few nice greenlanes which act as shortcuts around here though, so I can take it down them!
At the moment it's pretty stock (front spoiler removed, numberplate remounted out the way and All-Terrains fitted) as it has to be my daily transport and do motorway cruising as well as all the off-road stuff. It's a good compromise at the moment, and can deal with pretty much anything thrown at it.
Use the Rangie for everything - love off-roading, but don't get to do it as often as I'd like (go up to Salisbury now and again and might go to Ireland with a few mates at Christmas). There's a few nice greenlanes which act as shortcuts around here though, so I can take it down them!
At the moment it's pretty stock (front spoiler removed, numberplate remounted out the way and All-Terrains fitted) as it has to be my daily transport and do motorway cruising as well as all the off-road stuff. It's a good compromise at the moment, and can deal with pretty much anything thrown at it.
hehe!
Have a look at this one... this is my friends BGT V8 running open headers at north weald.
http://youtube.com/watch?v=ZuXScBuYHGY
Ive driven this car in anger @ the pod and gotten 12 second runs in.
Wouldnt drive it on the road like that mind. Ive got 4 cherry bombs on my V8 at the moment and its rediculously loud. Ive bought some chevvy big bore silencers to shut it up a bit!
Funny that we are trying to do different things isnt it? Yours isnt loud enough and I can't shut mine up!!!
Have a look at this one... this is my friends BGT V8 running open headers at north weald.
http://youtube.com/watch?v=ZuXScBuYHGY
Ive driven this car in anger @ the pod and gotten 12 second runs in.
Wouldnt drive it on the road like that mind. Ive got 4 cherry bombs on my V8 at the moment and its rediculously loud. Ive bought some chevvy big bore silencers to shut it up a bit!
Funny that we are trying to do different things isnt it? Yours isnt loud enough and I can't shut mine up!!!
If you can collect you're welcome to my old ones! It'll be a few months before they can come off mind... I mangled my block huggers on a gate stop Its bent back so far there is only a quater inch between the right hand bank and the starter motor! 
Once ive bought myself a new set of block huggers i'll fit my big bore chevvy system and you're welcome to the cherry bombs.
They are 2 1/4 inch inlet and 2 1/2 inch outlet.
Theres some pics on page 8 of the cherry bombs in this thread
http://thestudentroom.co.uk/showthread.php?t=376671&page=8
You can have a listen here... at the end of the clip i stick the camera by the left hand tailpipe.
http://video.tinypic.com/player.php?v=4uwb8ds
i'll only stick em on ebay for a fiver each if you dont want them. They'll be in north birmingham when they come off.. proberbly towards the end of august.
Once ive bought myself a new set of block huggers i'll fit my big bore chevvy system and you're welcome to the cherry bombs.
They are 2 1/4 inch inlet and 2 1/2 inch outlet.
Theres some pics on page 8 of the cherry bombs in this thread
http://thestudentroom.co.uk/showthread.php?t=376671&page=8
You can have a listen here... at the end of the clip i stick the camera by the left hand tailpipe.
http://video.tinypic.com/player.php?v=4uwb8ds
i'll only stick em on ebay for a fiver each if you dont want them. They'll be in north birmingham when they come off.. proberbly towards the end of august.
JC: Thanks for the very generous offer, but I don't think I'll be able to get down to Birmingham any time soon.
Still, things might have changed by August. From the pics they look like the original 70's style ones...nice!
Fordie: Yeah, suppose insurance ought to know about it, hopefully won't affect premium.
Still, things might have changed by August. From the pics they look like the original 70's style ones...nice! Fordie: Yeah, suppose insurance ought to know about it, hopefully won't affect premium.
oh i bet it will!! when i put a performance exhaust on my old car (1.2 fiesta, me aged 20) it was an extra £100 a year. that was with norwich union. i'm with admiral now and i pay an extra £30 per mod (2.0 Fiesta, me aged 22). and depending who your with, they may not insuree you at all.
oh and i forgot to add, neither companies will replace the moddified parts. the rule is, the car goes back to standard only in the event of a theft or an accident. if someone nicks my led rear lights, they will only give me standard ones. funny thing is, with the price of ford stuff these days, it would probabily be cheaper them buying the modifyed item as oppsoed to the standard one!
I'm only insured third party, fire and theft. So if anything gets damaged and it's my fault, the expense comes out of my pocket anyway. I would assume that as long as I told my insurance company about any mods, if somebody crashes into me and it's their fault, their insurance company must have to pay for all the stated mods on my car? If not, that seems a touch unfair!
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