Ive had a vintage speed system on my 2056 type 4 for some time. I had to remove the silencer recently and stuck a standard box on just to keep me mobile. Apart from the fact its quieter, weirdly, the van seems more responsive??? I thought it would be the other way round?
At a guess, more torque is being produced with the smaller pipe, probably less top end power, but how often do you rag it until it screams?
As you say its much more responsive on initial acceleration and seemed to get me through the gears to 60 really well and fairly quietly. Ive got the vintage speed j tubes into a borrowed standard type 4 back box. I don't really rag it, its a lardy westy so its never going to win any drag races. The reason i got the exhaust in the first place was to stop spending out on rusty exhausts.
On a T4 you are reducing the head cooling using J tubes instead of heat exchangers. Fit CHT gauges to check as your quest to minimise rusty tinware might lead to needing new heads sooner. The stock heat exchangers arent just for cabin hot air.
I'm finding the same. I drove my 2.4l with a stock exhaust for a few years, but thinking it would/could be better at the higher end of it's rev range fitted a bigger box and seem to have killed the bottom end. It has two tailpipes side by side, I'm going to block one off and see what happens.
I'm still experimenting with timing and jetting TBH. I've made a big change to jetting from 32 to 30 vents, 55 to 45 idles, 145 to 140 mains amd 180 to 200 airs. Now the AFRs are great but it runs really poorly under any load - gutless and noisy. All the changes are from too rich so I probably need to take out some advance...apparently.
Not massively modified, but not stock. The previous owner had the engine built with a 73 grind webcam and twin 40 webbers. As nice as the VS supersport box is, i am quite liking the quieter life. I must be getting old.
Me too, mine now sounds like a tractor and goes worse. I also had a VS exhaust of my t1 2020 and that sounded great but it was an engine built for high revs. To be fair once the revs are up this one is ok but the engine isn't built to rev. Doh!
Still like the sound of the quiet and stock type exhausts. I think they sound more characterful and you can hear more of the engine compared to exhaust note and I want to hear that boxer note. 2litre stock engine by the way Now I’m hearing that VS may change your power delivery in not the way you expected. I’m sticking with my Empi quiet pack, twin tail pipe. You can hear a fruity tone and loads of low down power. Just wish they did one of these ‘crap’ exhausts in stainless
Yes, I think I'm going to have to consider my options. Its a heavy bus, always full of camping gear. Perhaps i should look at a near stock stainless box if such a thing exists or a ceramic coated mild steel one???