TVR Cerbera 12 second quarter mile kit? modified air box?

[brakedust300]

Been looking at this kit and was thinking of having most of this done at some point anyway, also my drivers side air box is damaged where the intake pipes fit onto it, looks like someone has over tightened the jubile clips on them and slightly crushed box.

It mentions in the description that there is a modified air box... any ideas what that entails?

[JensenA]

ACT do one, it has 'pulse' plates fitted inside, rather than just a big empty void.

[trackcar]

brakedust300 said:

Been looking at this kit and was thinking of having most of this done at some point anyway, also my drivers side air box is damaged where the intake pipes fit onto it, looks like someone has over tightened the jubile clips on them and slightly crushed box.

It mentions in the description that there is a modified air box... any ideas what that entails?

Is it my kit youre talking about? I'm not aware of any other quarter mile kits on the market so I think it must be. My induction kit doesn't have airbox parts in it, there's no point having a different trumpet to the one already there as it already flows as much air as you would ever need and I've mapped factory 5 litre AJP8s and never found any gains over the OE trumpets. If yours are collapsed just sleeve them with steel tubing, shouldn't take more than an hour to do all 8 inlets. Once they're steel sleeved you will never crush them ever again, it's the most reliable long term solution.

Pulse plates are worthwhile to claw back any hp at parts of the rev range you think are underperforming, but they can't be fixed in a design of airbox as their position from the trumpet is what you need to alter to vary the point in the rev range at which they have their greatest effect. Didn't know ACT did pulse plate now aswell as me, I can't find them on their website either ..

[FUBAR]

Joo, I think my ACT kit has the pulse plates...and theyve been on, what? 3 years now?

But you know me and my technical expertise, I may be wrong

[trackcar]

Well no-one had ever mentioned them until I started with them on NickCC's car but it's possible they had been used before on Cerberas and kept secret for some reason (though why anyone would keep secret something of benefit I have no idea ) There are no pulse plates in the ACT kit on their website so either the pic is 3 years out of date or they aren't part fo that kit. You don't need them to get the top end figures of course, and not every car would benefit from having them (ie any low bits in the hp curve are minimal) and it's hours and hours on the dyno making them work properly but if you want the smoothest hp curve you can get then they can be quite useful. NickCC's 440hp curve is RV8 smooth, almost a straight line

Edited by trackcar on Tuesday 19th February 13:01

[rev-erend]

FUBAR said:

Joo, I think my ACT kit has the pulse plates...and theyve been on, what? 3 years now?

But you know me and my technical expertise, I may be wrong

Fubes - are yours under your seat

[Steve_T]

Have to say it's a bit strong accusing the standard blackplate of having trumpets, more a spigot than a trumpet. Also the heads are going to be the limiting factor in the intake path, so unless you put on an absolutely tiny intake pipe on somehow, there's going to be enough flow. This is proven by HarryW's car which makes 435 on standard 4.2 intakes with conservative mapping.

Edited by Steve_T on Tuesday 19th February 15:20

[brakedust300]

trackcar said:

Is it my kit youre talking about? I'm not aware of any other quarter mile kits on the market so I think it must be. My induction kit doesn't have airbox parts in it, there's no point having a different trumpet to the one already there as it already flows as much air as you would ever need and I've mapped factory 5 litre AJP8s and never found any gains over the OE trumpets. If yours are collapsed just sleeve them with steel tubing, shouldn't take more than an hour to do all 8 inlets. Once they're steel sleeved you will never crush them ever again, it's the most reliable long term solution.

Pulse plates are worthwhile to claw back any hp at parts of the rev range you think are underperforming, but they can't be fixed in a design of airbox as their position from the trumpet is what you need to alter to vary the point in the rev range at which they have their greatest effect. Didn't know ACT did pulse plate now aswell as me, I can't find them on their website either ..

Yep it was your kit that i had seen.
Good idea about the steel sleeve, do you do them? or are they simple enough to source/make myself?

[trackcar]

I just use exhaust tubing, a local motor factors will be able to supply you with some, can't remember teh size though so you'll have to measure the inside of your trumpets. I use anything from sikaflex to body filler to hold them in place. I call them trmpets because they have a trumpet shape to them inside the airbox, they're definitely radiussed and flow oodles of air The 4.2 inlets have what you would traditionally think of as a trumpet, they are very nicely shaped

[brakedust300]

trackcar said:

I just use exhaust tubing, a local motor factors will be able to supply you with some, can't remember teh size though so you'll have to measure the inside of your trumpets. I use anything from sikaflex to body filler to hold them in place. I call them trmpets because they have a trumpet shape to them inside the airbox, they're definitely radiussed and flow oodles of air The 4.2 inlets have what you would traditionally think of as a trumpet, they are very nicely shaped

Awesome

Cheers for that, ill be in touch reff the kit when im back from Abu-dabi sometime april.

[Steve_T]

trackcar said:

I just use exhaust tubing, a local motor factors will be able to supply you with some, can't remember teh size though so you'll have to measure the inside of your trumpets. I use anything from sikaflex to body filler to hold them in place. I call them trmpets because they have a trumpet shape to them inside the airbox, they're definitely radiussed and flow oodles of air The 4.2 inlets have what you would traditionally think of as a trumpet, they are very nicely shaped

I dunno Jules you spend hours on a dyno fitting pulse plates and then you stick in steel exhaust tubes into the back plates with anything you've got to hand.

[FUBAR]

[trackcar]

Steve_T said:

trackcar said:

I just use exhaust tubing, a local motor factors will be able to supply you with some, can't remember teh size though so you'll have to measure the inside of your trumpets. I use anything from sikaflex to body filler to hold them in place. I call them trmpets because they have a trumpet shape to them inside the airbox, they're definitely radiussed and flow oodles of air The 4.2 inlets have what you would traditionally think of as a trumpet, they are very nicely shaped

I dunno Jules you spend hours on a dyno fitting pulse plates and then you stick in steel exhaust tubes into the back plates with anything you've got to hand.

It works, it's cheap, it won't crack and is far better for the job than fibreglass or carbon fibre on it's own. They should have been sleeved from TVR in the first place then there'd be no need to repair them.

[rev-erend]

Just think of all the weight..

Fubar needs all the saving he can get

[FUBAR]

I am pastor redemption rev-erend (see wot I did there? )

[rev-erend]

FUBAR said:

I am pastor redemption rev-erend (see wot I did there? )

You pennance my child is :

10 bloody marys
and
be found in the bed of a young virgin..

Enjoy yourself in Amsterdam..

[Steve_T]

trackcar said:

Steve_T said:

trackcar said:

I just use exhaust tubing, a local motor factors will be able to supply you with some, can't remember teh size though so you'll have to measure the inside of your trumpets. I use anything from sikaflex to body filler to hold them in place. I call them trmpets because they have a trumpet shape to them inside the airbox, they're definitely radiussed and flow oodles of air The 4.2 inlets have what you would traditionally think of as a trumpet, they are very nicely shaped

I dunno Jules you spend hours on a dyno fitting pulse plates and then you stick in steel exhaust tubes into the back plates with anything you've got to hand.

It works, it's cheap, it won't crack and is far better for the job than fibreglass or carbon fibre on it's own. They should have been sleeved from TVR in the first place then there'd be no need to repair them.

oooh a pithy remark about carbon, now there's a shocker!

[Cyclone1]

ACT Pulse Plates, did they or didn't they have them years ago.....but they kept it really quiet......would be interested to know, can one of the southern belles please answer?

Good choice on the 1/4 mile kit, it was based on the mods that Joolz did on my old Cerb where we saw excellent gains from the Whirlwind Induction more so than any other type of induction, and along with the other mods saw it perform easily the best at the Austec Santa Pod Day (yes that old chestnut!).

Like Joolz said you can either sleeve your backplates, or have try and find a replacement, or you can go down the ACT route but then you have to have their smaller pipes fitted 50mm v 70mm.

Jules.

[ACT]

3 years ago Paul Austin and I tested many variations, we've tried pulse plates but never went into production.
Our induction kit does flare out from 50mm to 70mm but this happens within the airbox by using a large carbon trumpet.
Here's a thing, due to demand I'm just about to produce a batch of alloy trumpets to fit into the standard 4.5 backplate, these will stengthen the spigot and offer a stand alone trumpet within the airbox, they will only protrude around 20mm or so into the airbox so we don't change the tract length too much. our testing has also proved that bonding in trumpets are better than using the backplates alone, these will be inexpensive to.

Tim ACT

[Steve_T]

Yeah that old chestnut eh Jules Would this be the time when I raise your superior startline technique (no disputing it) versus terminal speeds achieved by other Cerbs again?