pumpkinboy1991
Member
Hi all... going to go into a bit of a spiel here so that anyone with any technical knowledge can have an overview of all the facts - I apologise in advance!
I purchased the above car back in July, a 56 plate (MY07) with 94k on the clock. I knew it had a slightly different rear section on the exhaust, as it sounded a bit "fruitier" than the OEM system - and also, given the tiny stainless rear backbox and different shaped oval tips, it was quite obvious it wasn't stock. I didn't realise until I had driven it from Devon back to Glasgow however, that it had clearly been remapped aswell... got a rather surprising shock downshifting close to home when it crackled and banged like a supercar, after such a peaceful and quiet cruise up the motorway from England. The next day was a surprisingly nice day in Scotland, so I thought I'd take my new car out for a spin and rather than "waste all that fuel" running the aircon pump, I got the windows down and the sunroof open... at which point I nearly passed out from exhaust fumes. It seems that opening the windows draws an overpowering stench of fumes into the cabin like a venturi!
The car has a BRC gas system, with donut in the boot floor - so I inspected this to see if there were any holes that might be letting exhaust fumes in. There were a couple, so I siliconed them up but this had no noticeable effect. I also checked the exhaust over myself and had my usual workshop check it too - his comments were that he could find no leaks, but that he liked the "decat" system (he said this rather sarcastically...) To be honest, the car appears to have cats in the place I would assume them to be, but perhaps they are dummies or something, I'm not sure. Maybe he was judging this by the strong fumes smell.
The next chapter of the story is that I took it to Ecotune in Hillington, a highly respected tuning shop with 4wd dyno. I thought that by getting it dyno'd I would at least have a basepoint to start from to get the car running less rich/fumey. The dyno result is that the car is only producing 330hp at the engine, and 380lbft of torque. The manufacturer figures are in the 390hp region, and 420lbft of torque, confirmed by a fellow 56 plate S/C owner there at the dyno day, who said his was stock and dyno'd at 401hp.
So basically, where should I start? The issues I want to address are specifically the fumes in the cabin/trying to attach a trailer, it is genuinely so fumey that you can't stand behind it without wanting to hold your breath or turn it off. It's clearly running far too rich but has no warning lights on and generally runs very smoothly. Note that running on petrol is worse than on LPG, but still fumey on LPG just not to the same extent.
Where could the fumes be entering the cabin, and could the revised position of the exhaust have an effect, as they are now located more centrally than the OEM peashooters would be?
Secondly, what should I do about finding where this 60hp has got to...do I need to do some mechanical investigation, such as find out if I'm getting a slight misfire or something that I can't detect due to the other 7 cylinders working fine? Or should I get it remapped by someone first to stop it being so rich.
Any advice appreciated as I would really like to be able to put my windows down by the end of the year!
I purchased the above car back in July, a 56 plate (MY07) with 94k on the clock. I knew it had a slightly different rear section on the exhaust, as it sounded a bit "fruitier" than the OEM system - and also, given the tiny stainless rear backbox and different shaped oval tips, it was quite obvious it wasn't stock. I didn't realise until I had driven it from Devon back to Glasgow however, that it had clearly been remapped aswell... got a rather surprising shock downshifting close to home when it crackled and banged like a supercar, after such a peaceful and quiet cruise up the motorway from England. The next day was a surprisingly nice day in Scotland, so I thought I'd take my new car out for a spin and rather than "waste all that fuel" running the aircon pump, I got the windows down and the sunroof open... at which point I nearly passed out from exhaust fumes. It seems that opening the windows draws an overpowering stench of fumes into the cabin like a venturi!
The car has a BRC gas system, with donut in the boot floor - so I inspected this to see if there were any holes that might be letting exhaust fumes in. There were a couple, so I siliconed them up but this had no noticeable effect. I also checked the exhaust over myself and had my usual workshop check it too - his comments were that he could find no leaks, but that he liked the "decat" system (he said this rather sarcastically...) To be honest, the car appears to have cats in the place I would assume them to be, but perhaps they are dummies or something, I'm not sure. Maybe he was judging this by the strong fumes smell.
The next chapter of the story is that I took it to Ecotune in Hillington, a highly respected tuning shop with 4wd dyno. I thought that by getting it dyno'd I would at least have a basepoint to start from to get the car running less rich/fumey. The dyno result is that the car is only producing 330hp at the engine, and 380lbft of torque. The manufacturer figures are in the 390hp region, and 420lbft of torque, confirmed by a fellow 56 plate S/C owner there at the dyno day, who said his was stock and dyno'd at 401hp.
So basically, where should I start? The issues I want to address are specifically the fumes in the cabin/trying to attach a trailer, it is genuinely so fumey that you can't stand behind it without wanting to hold your breath or turn it off. It's clearly running far too rich but has no warning lights on and generally runs very smoothly. Note that running on petrol is worse than on LPG, but still fumey on LPG just not to the same extent.
Where could the fumes be entering the cabin, and could the revised position of the exhaust have an effect, as they are now located more centrally than the OEM peashooters would be?
Secondly, what should I do about finding where this 60hp has got to...do I need to do some mechanical investigation, such as find out if I'm getting a slight misfire or something that I can't detect due to the other 7 cylinders working fine? Or should I get it remapped by someone first to stop it being so rich.
Any advice appreciated as I would really like to be able to put my windows down by the end of the year!
