Induction trumpets

[kevd]

Hi All
Time to treat myself to some new Xmas goodies, and as usual it revolves around shiny bits for the Griff.
As always there is a considerable list, and limited funds. One of the parts I am considering is replacing the horrible scaffold tube induction pipes with some nice ACT or V8D trumpets, and a K&N filter. What I really want to find out is there any real world improvement in power/driveability over the standard effort.
The car is decatted with smoothbore induction pipe and Pipercross filter, she drives lovely without any shunting, and last time she went on the rollers produced 297 BHP. Part of me says if all is running well leave well alone, but on the other hand can't help but fiddle, and it would be very nice to break the 300 mark.
So any experience of fitting trumpets will be greatly received.
Kev

[phazed]

I take it you must have the 72mm plenum already?

As well as the trumpets, it would be an opportune time to fit a ported inlet manifold.

You would defo break the 300 barrier then!

[bluezeeland]

phazed said:

I take it you must have the 72mm plenum already?

As well as the trumpets, it would be an opportune time to fit a ported inlet manifold.

You would defo break the 300 barrier then!

Yeah, go on.....no turkey, no prezzies, cava iso champers....nice one !

Would love a set of ACT trumpets and a 72 mm throttle/b myself, maybe next year (January 2nd iwo....)

[kevd]

Was 72mm standard on the 500? I was under the impression that the inlet manifold was ported as the trumpet dia was increased on the 500 I think to 45mm but Iam unsure of this as I haven't measured them.

[phazed]

kevd said:

Was 72mm standard on the 500? I was under the impression that the inlet manifold was ported as the trumpet dia was increased on the 500 I think to 45mm but Iam unsure of this as I haven't measured them.

Don't think so.

[phazed]

Just a taster.

Edited by phazed on Wednesday 9th December 10:33

[MPoxon]

Inlet manifold was increased to 44mm on the 500s, probably not much point swapping for the sake of 1mm.

You will need this kit trumpet for your 500.
http://www.actproducts.co.uk/product/ti021-trumpet...

Would probably be worth going for the thermal gasket at the same time and the smooth bore induction hoses. Tim at ACT is worth speaking to, very nice chap, honest about what his products can do and no hard sell.

This is well worth a read if you are looking to going down the tuning road:
https://matthewpoxon.files.wordpress.com/2013/05/s...

[kevd]

The Induction as standard seems really weedy, now that triple plenum looks like it will suck up small animals of the roadside when you hit the throttle.
Do you still use the standard airbox/filter? as this always looks too small in volume and filter area to my eyes.

[phazed]

kevd said:

The Induction as standard seems really weedy, now that triple plenum looks like it will suck up small animals of the roadside when you hit the throttle.
Do you still use the standard airbox/filter? as this always looks too small in volume and filter area to my eyes.

The bore size of the induction tube is larger in diameter and therefor I've a larger Pipercross filter.

[carsy]

Jools`s blended base is a work of art and another alternative to the ACT trumpets. Its a 45mm base so you would need to open the inlet just a tad where they meet.

Jools recons they give a good extra 10bhp. You are not going to really notice it but if you are chasing numbers it will get you over the 300 mark.

[450Nick]

carsy said:

Jools`s blended base is a work of art and another alternative to the ACT trumpets. Its a 45mm base so you would need to open the inlet just a tad where they meet.

Jools recons they give a good extra 10bhp. You are not going to really notice it but if you are chasing numbers it will get you over the 300 mark.

Trumpets are a much better solution than blended base. A blended base will gain you a couple of bhp at the very top end with a big loss of torque everywhere else, trumpets will do the opposite. If you want to actually go faster and feel faster, get trumpets. Google Helmholtz pulse wave induction tuning if you want to know why...

[macdeb]

450Nick said:

Trumpets are a much better solution than blended base. A blended base will gain you a couple of bhp at the very top end with a big loss of torque everywhere else, trumpets will do the opposite. If you want to actually go faster and feel faster, get trumpets.

airspeed.

[macdeb]

phazed said:

kevd said:

I was under the impression that the inlet manifold was ported as the trumpet dia was increased on the 500 I think to 45mm but Iam unsure of this as I haven't measured them.

Don't think so.

500 do have larger inlet manifold throats [not ported throughout], larger 45mm trumpets [though st ones] and the two I've stripped have had the manifolds matched to the heads with 'blue' and scribe marks visible.

[phazed]

Do the 500s have the 72mm plenum as standard?

[carsy]

Don't think so Peter.

[rigga]

phazed said:

Do the 500s have the 72mm plenum as standard?

No, normal Plenum size.

[phazed]

rigga said:

phazed said:

Do the 500s have the 72mm plenum as standard?

No, normal Plenum size.

63mm iirc.

[hillclimbmanic]

Would 45mm trumpets, and larger throttle body be effective on a 4.0..? Or would it be overkill?


Manic

[kevd]

[quote=bluezeeland]

Yeah, go on.....no turkey, no prezzies, cava iso champers....nice one !

Advice heeded thanks, I think I can save a few more quid cider instead of Cava. Just got to find enough for a new exhaust next.
Some interesting reading posted above thanks, it looks like a call to ACT will be imminent.
Joolz's blended base does look good, but I would prefer to have the trumpets sticking up, at least if a bit of debris or something got in there it stands a decent chance of not going down the holes, with the blende bases it would have no choice.

[Sardonicus]

hillclimbmanic said:

Would 45mm trumpets, and larger throttle body be effective on a 4.0..? Or would it be overkill?


Manic

On a stocker no the heads are a bigger restriction