Hayward & Scott exhaust ....
Discussion
Firstly thanks to Ian and the lads from H&S ,collected the car back from them yesterday after only 4 days !!! they have done a very very nice job , quality is awsome and i am very pleased with the look and sound .
The noise levels are 94db at 4000 rpm and 96db at 4500 ,it is much quiter at tickover and cruising at 60mph 70mph 80 mph a vast improvement ,over the std system .
Have not given it any welly yet as after advice from this forum ,im going to wait until mike has had chance to check it on sunday at the Dyno meet ,all i will say is its a much deeper sound very aggressive !!!
Price will be £700 + vat and about £100 fitting ,delivery is 5 weeks !!
[pic]
[/pic]
[pic]
[/pic]
[pic]
[/pic]
[pic]
[/pic]
The noise levels are 94db at 4000 rpm and 96db at 4500 ,it is much quiter at tickover and cruising at 60mph 70mph 80 mph a vast improvement ,over the std system .
Have not given it any welly yet as after advice from this forum ,im going to wait until mike has had chance to check it on sunday at the Dyno meet ,all i will say is its a much deeper sound very aggressive !!!
Price will be £700 + vat and about £100 fitting ,delivery is 5 weeks !!
[pic]
[/pic][pic]
[/pic][pic]
[/pic][pic]
[/pic]Edited by TuxMan on Saturday 18th April 11:08
TuxMan said:
Don,t know about remapp , will no better tomorrow but we are hoping not . Never asked about warranty !!! but there was a 3/4 of a million pound Bently next to my Noble so something tells me i,m not going to have a problem !!!
You will definitiely need a remap after changing to a true dual exhaust. It will run too lean at upper rpms without one. That's how restrictive the stock exhaust is. You have changed the AFR by allowing the engine to breath better. These engines are very sensitive to any improvements to intake and exhaust flow and the stock ECU cannot adapt to it on its own.
TuxMan said:
Don,t know about remapp , will no better tomorrow but we are hoping not . Never asked about warranty !!! but there was a 3/4 of a million pound Bently next to my Noble so something tells me i,m not going to have a problem !!!
Maybe, maybe not.Only when pushing on will it make any actual difference, and if the AFR was on the rich side, (which is common on standard cars) it will only make a small difference and probably still be within a workable range. Always best to get checked though.
Mike.
sjc said:
Tuxman, didn't they quote you 500-600 quid originally ? £7090 + vat is quite a jump, has the spec changed from the original back-box only?
changed spec a bit + that is a one-off price !! if you get a order for 5 there is a discount available !! still think at £700 +vat it is a good buy !!JLSELAN said:
Not sure how much you'll learn about AFRs from a standard rolling road test, actually, since they likely won't take the time/effort to hook up the dedicated wide-band lambda sensor that's needed to get accurate results.
Actually we had a very successfull day and learnt a lot about what the exhaust does and how it effects the car and i'm quite sure that the people involved did take the time/effort to make sure we understood the results !!! Edited by JLSELAN on Sunday 19th April 17:48
No , no need for a remapp but would be a good idea to get the best out of the mod although the gains in std form were there to see !!! and with some mapping tweeks a big step in power is a pretty easy option ,the general opinion is its a good improvement over the std box for similar money !!!
Edited by TuxMan on Sunday 19th April 22:02
The dyno basically showed a dual box system gives approx 20bhp and allows quicker spool up and increased power at high revs. From what I remember from the results the exhaust also leans the engine as it breathes better so a remap (or RR run) is a must really to ensure correct fuelling.
Another thing the day showed is all the standard cars had maps that could be improved on and quite a few showed dramatic boost loss at higher revs which seems to be caused by fault actuators.
Dave
Another thing the day showed is all the standard cars had maps that could be improved on and quite a few showed dramatic boost loss at higher revs which seems to be caused by fault actuators.
Dave
TuxMan said:
No , no need for a remapp but would be a good idea to get the best out of the mod although the gains in std form were there to see !!! and with some mapping tweeks a big step in power is a pretty easy option ,the general opinion is its a good improvement over the std box for similar money !!!
You are getting some bad advice, IMHO. You need a remap. Keep it below 6,000 rpm in the meantime.Edited by TuxMan on Sunday 19th April 22:02
Edited by caccobra on Sunday 19th April 22:28
D_G said:
The dyno basically showed a dual box system gives approx 20bhp and allows quicker spool up and increased power at high revs. From what I remember from the results the exhaust also leans the engine as it breathes better so a remap (or RR run) is a must really to ensure correct fuelling.
Another thing the day showed is all the standard cars had maps that could be improved on and quite a few showed dramatic boost loss at higher revs which seems to be caused by fault actuators.
Dave
Yes, the true dual exhaust leans the AFR out, sometimes dangerously at high rpms.Another thing the day showed is all the standard cars had maps that could be improved on and quite a few showed dramatic boost loss at higher revs which seems to be caused by fault actuators.
Dave
Fault actuators? The loss in power at high revs is caused by the stock exhaust.
Fuel trim by the ECU only comes into play if the charge air temp is too high.
Edited by caccobra on Sunday 19th April 22:34
I'm not going to get sucked into yet another tuning row but I'll give you the facts from my car.
Peak boost of 0.54bar @ 4750rpm, dropping off to 0.45 bar from 5500 RPM onwards. It also shows poor spool up compared to others on the day that had consistant boost.
The exhaust definately showed gains especially at high revs and improved spool, the results from my car (and others) show a definate problem with the boost pressure.
Dave
Peak boost of 0.54bar @ 4750rpm, dropping off to 0.45 bar from 5500 RPM onwards. It also shows poor spool up compared to others on the day that had consistant boost.
The exhaust definately showed gains especially at high revs and improved spool, the results from my car (and others) show a definate problem with the boost pressure.
Dave
D_G said:
The dyno basically showed a dual box system gives approx 20bhp and allows quicker spool up and increased power at high revs. From what I remember from the results the exhaust also leans the engine as it breathes better so a remap (or RR run) is a must really to ensure correct fuelling.
Another thing the day showed is all the standard cars had maps that could be improved on and quite a few showed dramatic boost loss at higher revs which seems to be caused by fault actuators.
Dave
Did you mean to say "faulty" actuators? If so, that would likely contribute to low boost issues, and it may not be a surprising issue considering the age and service history of typical UK cars.Another thing the day showed is all the standard cars had maps that could be improved on and quite a few showed dramatic boost loss at higher revs which seems to be caused by fault actuators.
Dave
Edited by JLSELAN on Monday 20th April 00:12
Gassing Station | Noble | Top of Page | What's New | My Stuff