v6 and v8 exhaust box the same?

[magpies]

Is the exhaust box on the S3C and the V8S identical?

[v8s4me]

Don't think so. This is my old system...


The V8S one is oval. I thought the V6 one was rectangular.

[GreenV8S]

v8s4me said:

The V8S one is oval. I thought the V6 one was rectangular.

Same. The center box on my S2 was rectangular. I doubt the two systems have anything in common.

[MisterTee]

Yeah my V6 has a rectangular box too

[v8s4me]

And of course the V8 one sound sooooo much better

[magpies]

v8s4me said:

Don't think so. This is my old system...


The V8S one is oval. I thought the V6 one was rectangular.

Reason I'm asking is:
Within the actual box - is the V6 more restrictive and would kill the power if fitted to the V8?
Two 2" pipes will pass 300bhp so the V6 pipes are ok.

[v8s4me]

Hi Mick - what are you trying to do? Fit a V8 system to your car or a V6 system? given your power output I'd guess you'd be better off with a V8 system. Why don't you make a bespoke one?

[magpies]

v8s4me said:

Hi Mick - what are you trying to do? Fit a V8 system to your car or a V6 system? given your power output I'd guess you'd be better off with a V8 system. Why don't you make a bespoke one?

I made a bespoke system and it passes 265bhp easily.

I'm asking for a friend whose system is only managing 220.

[v8s4me]

magpies said:

I made a bespoke system and it passes 265bhp easily.

I'm asking for a friend whose system is only managing 220.

Only 220bhp The V8 one will be fine

[magpies]

a friend has put the Jag into his S and used the original V6 box and rear pipes, on the rolling road it only managed 220bhp and not the expected 265 ish that others including me have. I was wondering, as the V8S has about 240bhp but the V6 has about 170bhp,what the differences were. It is obviously a different, higher capacity exhaust box as the pipes are the same (certainly the rears are both 2 x 2")

[v8s4me]

Was that 220bhp at the rear wheels? You would expect more than that as you say. Why not make him one like yours?

[GreenV8S]

magpies said:

the V8S has about 240bhp

No.

TVR figures from the 390 onwards are wildly inflated. Realistically you're doing well to get an honest 225 at the flywheel from a stock V8S. I think mine ended up at around 265 after a cam change and a lot of induction work. The 4.6 with the same induction was around 285 iirc. The numbers may be a bit off - it was 20 years ago - but if you're taking 240 as the baseline you're probably off by a good 20 bhp at least.

[magpies]

GreenV8S said:

No.

TVR figures from the 390 onwards are wildly inflated. Realistically you're doing well to get an honest 225 at the flywheel from a stock V8S. I think mine ended up at around 265 after a cam change and a lot of induction work. The 4.6 with the same induction was around 285 iirc. The numbers may be a bit off - it was 20 years ago - but if you're taking 240 as the baseline you're probably off by a good 20 bhp at least.

TBH we are talking fitting the Jag AJ30, mine showed 265 on Joolz rolling road. At 7000 rpm and will go a bit more.