I’ve said this before, but if you do track days, the standard ehaust gives 96/97DB on my ‘S’. It may sound anaemic outside the car but sure is noisy inside at 8000 rpm. There are lots of track days with a 98DB limit so beware of fitting a noisy exhaust.
Chris
There are lots of track days with a 98DB limit so beware of fitting a noisy exhaust.
Chris
Exactly
my s came with a stage2 from a NA, complete with undertray cut. Within 1000 miles the welds had bust - that’s when they discovered the exhaust wasn’t supported!!!
my cars about to go in for first service - is the stage 2 for the s out yet?
did you get them to correct the mistake / replace undertray??
I’ve said this before, but if you do track days, the standard ehaust gives 96/97DB on my ‘S’. It may sound anaemic outside the car but sure is noisy inside at 8000 rpm. There are lots of track days with a 98DB limit so beware of fitting a noisy exhaust.
Chris
That figure seems a bit high for the std exhaust. I’ve had a new, larger silencer (straight-thru design) on test on an S and it read 89dbs on the drive-by at Bedford.
I’ve said this before, but if you do track days, the standard ehaust gives 96/97DB on my ‘S’. It may sound anaemic outside the car but sure is noisy inside at 8000 rpm. There are lots of track days with a 98DB limit so beware of fitting a noisy exhaust.
Chris
That figure seems a bit high for the std exhaust. I’ve had a new, larger silencer (straight-thru design) on test on an S and it read 89dbs on the drive-by at Bedford.
Maybe the figure was for at max revs reasonably close to the exhaust? I once messured by NA Exige S2 with Stage 1 exhaust and the max messured was around 97dB. Now it’s 97dB at half revs.
got the same “blah blah batch of stage 2’s had to go back to Lotus” bollocks from B&C today
Hello from a new member, I have just bought a Exige S and also wanted a sports exhaust fitted, I have a friend who works for Proton cars in there main distribution site in Bristol, he has told me that on the 4th of May all 67 sports exhausts were recalled by Janspeed as they have had a problem with the item on a car in Australia, from what he he’s said Janspeed are re-manufacturing and Proton expect them back by the end of the month.
hi,from yet another new member . just had my fitment of sports exhaust postponed by dealer due to availability! was due to be fitted friday.
Wow, all 67 recalled. What sort of BS manufacturing standards are being adhered and why is it first being sent to Australia? I’m glad I made the choice to go Arqray instead of waiting for this substandard vaporware to come true.
10 days is the latest ETA from B&C (as of today)
Don’t hold your breath!!! Just spoke to Jim @ 2bular & my zaust will be with me in 3 weeks, quality item that doesn’t cost much more.
voids warranty
only a problem if it relates to the changed item, what problems will happen from a change of box? (fingers crossed)
The warranty issue is not that cut and dried, how likely is an exhaust to cause a problem? ‘really’ not urban legend, its a relatively straight forward swop, if anyone is that worried about minor mods i would advise them to keep their car 100% standard.
“engine pop, back pressure” would be the most likely scenario to prevent a warranty claim, IMO
I got tired of waiting, and bought a 2bular for my S. Lotus is really screwing this up.
Unless confirmed in writing from Lotus to state that aftermarket exhaust systems void warranty. The “popping” noises are attributed from the resonators and muffler of the exhaust system, NOT the engine.
Backpressure is also attributed to engine flow exhausted from the exhaust manifold aka header. The cycle of flow cannot be reversed and is impossible to reverse under any type of conditions even extreme use/severe racing.
So whoever that is constantly supporting this BS that changing your exhaust system will void your warranty because of the above lame reasons should ought to learn abit about simple engine dynamics and operation.
You’d be more than likely to so call “blown” an engine, bend/drop a valve fro mis-shifting at RPM in the wrong gear than an attributed exhaust system upgrade. Sorry, the 2ZZ-GE may be planted in the rear of this car. But it isn’t some exotic engine that even a Lamborghini Murcielargo needs specific BS marketing to live with.
Even exotics and supercars upgrade their exhaust systems with no issues. Have a search on Tubi for Ferrari, that’d be a good place to start and Ferrari owners sure don’t live and breathe the same BS found here either endlessly propagated by Lotus and/or actually from some ignorant owner who believes some smoke blown in their face by some Lotus dealership rep.
Noel
Whilst you may be technically correct, the potential problem would be in making a warranty claim , which is then disputed. Enforcing one’s rights may involve legal fees etc, plus the undoubteded delay in getting the car back on the road.
Must admit, I don’t know what I’d do if I had an S2 with loads of warranty left, & wanted to change the exhaust - Jim’s 2ubular stuff is definately fantastic
Sorry Noel I’m going to have to disagree with you. Backpressure seen at the exhaust valve is dependent on flow and pulsations. The manifold, catalyst and silencer are all responsible for the total. The cat and silencer are responsible for most of it. The steady state (i.e. stick a tapping in and meausure on a low resultion channel on the dyno would give a value of 0.3-0.5Bar for a typical sporty car, maybe up to 1.5Bar for a limo.
On top of the steady state average you’ve got to account for the pressure waves which are generated when the valves open. When the high pressure wave hits the collector it bounces back along the primary runner towards the exhaust valve as a low pressure wave which if designed correctly will be just as the valve is closing and gives an extra slurp to draw more exhaust gas out and therefore wmore inlet charge in. The happens at high engine speed. At lower speeds the wave gets to bounce up and down the runner twice, this time it hits the valve as a high pressure pulse and stuffs the exhaust gas back into the cylinder and you see a torque dip. Finally at low speed you get three bounces which again boosts cylinder charging and therefore torque. This sequence of events is for a 4-1 manifold, 4-2-1 manifolds have a more complaxe interaction which gets rid of the second bounce dip but due to the extra junctions the other peaks are less prominent.
If you change the exhaust back pressure due to cat, system or manifold the mixture and quantity of gases will change and the ignition timing and fuel flow may not be correct any longer. This could in theory cause damage to the engine due to detonation or running over lean (Exige Ss run too lean at the top end when modded according to Craig7Ls dyno runs).
Now I’m not saying that changing to any particular system will casue damage, I’m pretty sure it wont but the fact remains that it could.
I’ll see if I can get some grpahs from work to show these effects if anyone is interested.
Noel,
Replace the exhaust system with a 5mm steel pipe and witness the effect. Then try removing the entire system completey. Okay, dramatic example, but proves the point nicely.
Also, before throwing about accusations of ignorance, go experience some warranty claims first hand - then you’ll see exactly where the “BS” comes from.