Plemun and trumpets
Discussion
Has anyone had any experiance of increasing the volume of the plenum by means of a spacer from TVR Power and/or SC Power. Apparently the 'ideal' is to have the plenum volume equal to the engine capacity. Because TVR used all the same 4 ltr Range Rover plenums - making my 500 a bit short of breath! The kit also comes with an insulating gasket to stop heat soak from the engine which keeps the air passing through it cooler and thus more dense. Also looking at fitting bellmouth trumpets to improve airflow into the engine. It all makes sense in theory - any experiences?
No experience of these bits but its on my list to do along with the Act smooth bore induction kit . From what i gather from reading up on the forums the power gains are not large but throttle response is improved every little helps i suppose. Saving up to buy these at the Growl plus its near my birthday so ill have to start dropping hints to her indoors .
Tom .
Tom . 
Didn't do the spacer BUT i did fit the SC Power bellmouths.
The bellmouths transformed the car. In simple terms it revs like a 4-litre car i.e. much faster and is therefore quicker. You can actually hear the air rushing in as you plant the throttle. Wouldn't go for a blended base as they have a tendancy to lose the all valuable torque......
I also have the usual Mark Adams tornado chip which made a bit (tiny) of a difference when initially fitted (5 odd years ago) but will see what extra difference I get once it is remapped - if I can get hold of him!
The bellmouths transformed the car. In simple terms it revs like a 4-litre car i.e. much faster and is therefore quicker. You can actually hear the air rushing in as you plant the throttle. Wouldn't go for a blended base as they have a tendancy to lose the all valuable torque......
I also have the usual Mark Adams tornado chip which made a bit (tiny) of a difference when initially fitted (5 odd years ago) but will see what extra difference I get once it is remapped - if I can get hold of him!
Veg said:
Didn't do the spacer BUT i did fit the SC Power bellmouths.
The bellmouths transformed the car. In simple terms it revs like a 4-litre car i.e. much faster and is therefore quicker. You can actually hear the air rushing in as you plant the throttle. Wouldn't go for a blended base as they have a tendancy to lose the all valuable torque.
do you have a dyno graph to prove this, would be interesting to seeThe bellmouths transformed the car. In simple terms it revs like a 4-litre car i.e. much faster and is therefore quicker. You can actually hear the air rushing in as you plant the throttle. Wouldn't go for a blended base as they have a tendancy to lose the all valuable torque.
No dyno figures yet, I'm using seat of the pants. I have a 4 ltr Chimp as well as a Griff 500 and the Chimp revs so freely that I could easily see the difference. Don't forget I have a Tornado chip in the Griff so it is "optimised" as it where.
They both rev freely now and the Griff feels right. I am going to take it to TVR power and see exactly what happened but regardless the bellmouths seem very good
If you chat to a few people you will get opinions on blended bases. I am sure they are good depending on whta state of tune the engine is in but I do know a certain RV8 guru has done a lot of work and in general sees torque loss.........
They both rev freely now and the Griff feels right. I am going to take it to TVR power and see exactly what happened but regardless the bellmouths seem very good
If you chat to a few people you will get opinions on blended bases. I am sure they are good depending on whta state of tune the engine is in but I do know a certain RV8 guru has done a lot of work and in general sees torque loss.........
Edited by Veg on Friday 18th April 13:40
Veg said:
Didn't do the spacer BUT i did fit the SC Power bellmouths.
The bellmouths transformed the car. In simple terms it revs like a 4-litre car i.e. much faster and is therefore quicker. You can actually hear the air rushing in as you plant the throttle. Wouldn't go for a blended base as they have a tendancy to lose the all valuable torque......
I also have the usual Mark Adams tornado chip which made a bit (tiny) of a difference when initially fitted (5 odd years ago) but will see what extra difference I get once it is remapped - if I can get hold of him!
Veg, can you please tell me more about the SC Power bellmouths ? I tried to email you but that doesn't work via PH.The bellmouths transformed the car. In simple terms it revs like a 4-litre car i.e. much faster and is therefore quicker. You can actually hear the air rushing in as you plant the throttle. Wouldn't go for a blended base as they have a tendancy to lose the all valuable torque......
I also have the usual Mark Adams tornado chip which made a bit (tiny) of a difference when initially fitted (5 odd years ago) but will see what extra difference I get once it is remapped - if I can get hold of him!
Meatball said:
clive f said:
simple, you no longer have any trumpets, just put a nice big chamfer into the holes in the base where the trumpets used to sit, and blend it all in nice and smooth.
Sorry i meant whats the benefit of blending the base?the blended base is offered by tvr power as part of their taraka upgrade, and I assume the new bellmouths are simply a mouth to fit over the opening in the base, but I may be wrong.
as for benefits, trackcar, will possibly be along shortly to give an expert opinion, I`ll just make an arse of it
but I have seen it give improvements on peoples cars on the rollers.
clive f said:
Veg said:
Didn't do the spacer BUT i did fit the SC Power bellmouths.
The bellmouths transformed the car. In simple terms it revs like a 4-litre car i.e. much faster and is therefore quicker. You can actually hear the air rushing in as you plant the throttle. Wouldn't go for a blended base as they have a tendancy to lose the all valuable torque.
do you have a dyno graph to prove this, would be interesting to seeThe bellmouths transformed the car. In simple terms it revs like a 4-litre car i.e. much faster and is therefore quicker. You can actually hear the air rushing in as you plant the throttle. Wouldn't go for a blended base as they have a tendancy to lose the all valuable torque.
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