Patsy450

iTrader: (2)

My eventual goal is like 450bhp and with the 2.5l and a 321t, the torque should be 450 ft/lbs and over hopefully. I was avised to keep my 2.5" exhaust system, as it makes for a much torquery and responsive car.

Steve Whitehorn

iTrader: (13)

Personaly I dont think that is good advice. Swapping to a 3in exhaust is a very good idea. Because at the 400plus level you are aiming for the 2.5in becomes constrictive. You can hear it in actual fact.

321t should be 450hp, max torque - now this is a guestimate on my part 470-480ish. Certainly you wont see such a big percentage gap between the power and torque at that power level as you do lower down.

Cheers
steve

Patsy450

iTrader: (2)

The advice I was given was from a very reliable source. Also, I know of someones car running around 480bhp on a 2.5" system. I'm well aware that many peolple and tuning companies say 3" for above a certain level, but I'm going with my giving advice.

harvey

iTrader: (48)

On a turbo car the last thing you need is back pressure. I know 2.5 inch exhausts can run at 500 bhp or getting close to that but this business about needing back pressure for more torque from a smaller diameter exhaust is a complete and total misconception on a turbo charged car.

ginger321

Not sure on the protocol regards quoting myself

the above is the mods an power etc for my car as it stands.

What torque is a VF28 capable of putting out?
Im thinking about a Hybrid gt FMIC or an Sti 8 TMIC conversion then a remap an was wondering if I left the spec as is only changing the intercooler would the torque gain be worthwhile? I realise the turbo and injectors are probably producing as much reliable power as the can at 334bhp. its torque im after.

Or do i need to consider a full decat, ported headers an up pipe to get the turbo spooling quicker to raise torque? I have a set of magnex headers in the garage an was going to sell them........

sorry if ive hi jacked the original post

Turbovin

iTrader: (2)

Well my tuner said that he got over 500 Nm (about 370 ft/lbs I think?) from my car on E85 but restricted it to 460 Nm to spare the gearbox and rods. 460 Nm on Vpower.