ACT carbon trumpets how good are they???

[V8FROG]

hi guys was wondering on a pretty standard engine,can u feel a difference with the ACT carbon trumpets and maybe the spacer from scPower??i am ready to order those items.tks for ur comments.
cheers

[dogbucket]

The trumpets are worth up to 10bhp on a 450, but doubt that could be felt? Although I fitted them on mine I drive it infrequently so difficult to tell as it always feels quick! A 400 will have standard length Rover trumpets so that may see more of an improvement in peak power percentage wise (Only me guessing on that)

I was in two minds about the spacer having read things about the way the top of the plenum interacts with the Trumpets and that gap being quite important, so I didnt bother. Others on here have reported improved driveability tho.

I will dyno mine again at some point and get a definitive answer.

If you have not fitted the ACT smooth bore induction, that is seen as the best value upgrade first.

[Alexdaredevilz]

dogbucket said:

The trumpets are worth up to 10bhp on a 450,

Only if the inlet is ported to match surly?

[900T-R]

Er, what? If you have got a 38 mm intake as per all non-500s, you get a set of 38 mm flared trumpets. Add a few tenners for a thermal insulating gasket between intake manifold and trumpet base, and a smooth bore 90 degree bend between plenum and air mass meter (silicone or otherwise), and it's as good as it's going to get for pocket money/install at home at a leisurely pace on a Saturday afternoon sort of things. Anything after this will be far more expensive and/or involved for smaller or similar gains on top of the ca. 10-15 lbs.ft/bhp (max) that little lot should bring...

[smudge660]

ill let you know......i installed the smooth bore kit on my 4.0HC and noticed a smoother run , I have just installed the ACT carbon flared trumpets not started him up yet but am hopeful of a noticeable change.
I also changed the gaskets on my exhaust to find one of the pre cats had perished , so i have removed the other ..............all the above plus the pre cats i am hoping for that little extra grunt!!

the main reason for the above work is mainly to do with low end shunting , so after a lot of reading from input on here the above seemed the best option.

ill keep updated when the chim is back on the road around end of march

[Al 450]

They are massively larger than the standard 450 trumpets and interlock cleverly together to really maximise the space in the plenum, I fitted mine at the same time as the smooth bore pipe and it does feel more torquey, the induction noise has changed slightly as well. Tried to get it rolling roaded but had an HT breakdown so had to abort but I'll post a copy of the run when I get it.

Realistically as said it's the best of the 'cheaper' upgrades. To go one better you need a 45mm trumpet base, manifold etc.

[SILICONE KID]

Yes those carbon trumpets are very long ,give better Torque.I have the short flared Aluminium trumpets supplied by V8D, less torque more more power.They are cheaper than the carbon trumpets and come fitted with the trumpet base..Do we need more torque or BHP ?Its not a Range Rover !

Edited by SILICONE KID on Tuesday 1st February 22:02

Edited by SILICONE KID on Tuesday 1st February 22:22

[dbv8]

SILICONE KID said:

Yes those carbon trunpets are very long ,give better Torque.I have the short flared aliminuim trumpets supplied by V8D less torque more more power.They are cheaper than the carbon trumpets and come fitted with the trumpet base..Do we need more torque or BHP ?Its not a Range Rover !

I will put up my nitrous torque curve against your peak bhp anytime Daz. I will only use a 60 shot and lets see who wins.
Get yourself to santa pod this July

[SILICONE KID]

I don`t need gas bottles scattered all over my car,I keep them in the back of my van! Do people ask you if your in to scuba diving

Dont need nitrous i have grunt !

I wonder what the results would be when fitted to the 4l 4.5l with a 72mm plenum,45mm trumpet base and ported inlet manifold.?

[dbv8]

I will take that as a no then

[V8FROG]

tks guys for ur comments ,i am waiting for TIM invoice.they look way better than the original so hopefully will feel a bit more power.funny question but do u need the insulating plate???cause carbon can take the heat pretty well right??

[dogbucket]

SILICONE KID said:

Yes those carbon trumpets are very long ,give better Torque.I have the short flared Aluminium trumpets supplied by V8D, less torque more more power.They are cheaper than the carbon trumpets and come fitted with the trumpet base..Do we need more torque or BHP ?Its not a Range Rover !

They are the same length as the standard 450 ones which come shortened from the factory, compared to the 400s completely standard rover ones. A fair balance between torques and bhp I thought.

V8FROG said:

tks guys for ur comments ,i am waiting for TIM invoice.they look way better than the original so hopefully will feel a bit more power.funny question but do u need the insulating plate???cause carbon can take the heat pretty well right??

I discussed this with Tim when I ordered my trumpets and he offered to get me an insulator base from TVR Power which had just come out. In the end it pushed the budget too much and was an untested combination so I didnt. The thickness of the plate is lengthening the intake tract so would also affect the power curve slightly. Worth asking him what the latest is.

[SILICONE KID]

Magna Parva sell a 38mm thermal insulator which do not need longer bolts.A chap called 350MATT sells them he as a Griffith but only in 38mm .TVR power sell a thin insultor which i have fitted for £17.50 not sure if there any good !

http://www.sc-power.co.uk/pages/SC-Power-engine-mo...

Edited by SILICONE KID on Wednesday 2nd February 10:17

[jenkotvr]

Mates installation for your perusal:

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

[900T-R]

SILICONE KID said:

Magna Parva sell a 38mm thermal insulator which do not need longer bolts.A chap called 350MATT sells them he as a Griffith but only in 38mm .TVR power sell a thin insultor which i have fitted for £17.50 not sure if there any good !

http://www.sc-power.co.uk/pages/SC-Power-engine-mo...

Yes, Matthew Feasy developed them from Magna Parva and now sells them himself as in fairness, RV8 engine bits are hardly MP's core business and they sold precious few of them. Matt is very responsive and easy to deal with and the fit & finish of his insulator gaskets is spot on every time.

[SILICONE KID]

Think you can even advance the engine when fitted for more power