TB'S trumpet size :)

[pie]

hay again :)

what size trumpets (air horns)?

will fit on a c20xe engine in a nova

the throttle bodies are direct off the head

stuck on what size trumpets to get for them

thanks

[craig green]

The longer you can use, the better it will be for engine torque.

Just bear in mind the lump will move back towards the firewall.

[Stuart]

has anyone actually done a set of back to back (same day) dyno runs with 10mm trumpets and 100mm trumpets?

Would be interested to see a REAL difference.

[MK999]

Seen it done at hertfordshire uni, but I'm sure you know the effects of it, just shifts the torque curve around. Believe they were doing it for a BTCC team at the time, find out what length trumpets to run to get the curve peaking a little before the rev limit. On a trackday nova, whatever fits imo, gains are gonna be pretty small and I think they were up to around 250mm trumpets in herts, certainly had some bloody big ones on the dyno when we were showed round

[pie]

cheers guys

so bigger the better ya ?

[mk1nova_rich]

cheers guys

so bigger the better ya ?

as big as you can fit without restricting air flow to the actual trumpets by having them too close to the bulkhead/firewall

[Big_Chap]

I run direct to head QED bodies with 90mm trumpets, getting a sausage filter on is tight and my drivers mount has been shortened slightly to allow more space at the bulkhead where it curves out at the battery area. 45's & filter fit no probs as will 90's if you don't run a filter, possibly even 120's without filter, your call though!

[Gareth_C]

i have QED direct to head throttle bodies with 120mm trumpets the biggest QED sell. I had to cut the bulkhead to fit them in withou a filter. but I have got 187 ft lb of torque from the engine not sure if the extra helped :thumb: