Best sounding exhaust upgrade
Discussion
AD77 said:
jamienshelly said:
Removing the pre-cats only gives a little bit of noise increase, but it removes 2 very big restrictions in the exhaust that are very close the engine, by removing them you can get rid of the gasses which in turn lowers the engine bay temps and allows the engine to rev a little smoother/faster and they do nothing positive when the engine is warm!. If you are unsure I would, remove the pre-cats, Clives 'y' piece and see how you get on honing around and long journeys. Then if you still think its not enough then sleeve or buy a sleeved system, so if it is too loud for you, you can swap it back fairly easily.
Hope this has helped
So i could end up with pre cats out, clive F AND sleeved.... would that sound ok?!!!Hope this has helped
jamienshelly said:
Ours does, some say its far too loud and some say its very nice, as I said in a previous post, its personal choice. we like so that is all that really matters but I have had far more positive comments than negative. Ask anyone who attended the last TiTT in September.
Do you have a vid/sound clip anywhere? Where are you based?StarmistBlue400 said:
AD77 said:
So i could end up with pre cats out, clive F AND sleeved.... would that sound ok?!!!
That would be bloody loud We are in Eastbourne so we are a fair way from you, so I will try to get a vid and attempt to get it on here. I also get flames!!
jamienshelly said:
It is, we are not allowed on any track (unless no limit), it idles at 94db and and 4500ish it was 123.8db.
We are in Eastbourne so we are a fair way from you, so I will try to get a vid and attempt to get it on here. I also get flames!!
With ACT Decat, no precats, ACT Supersport mine idled at 105db.We are in Eastbourne so we are a fair way from you, so I will try to get a vid and attempt to get it on here. I also get flames!!
Three weeks ago the ACT Cherrybomb system was put on to reduce sound levels but I feel that performance has been compromised considerably.
Just done 2000 miles around Spain and Portugal so it's had plenty of time to run in (if it needed it).
I will soon be putting the car on a Dyno to see what it's producing now, and then refitting the Straight-through for a back to back comparision.
To me the Cherrybomb system seems to have suffocated the engine, it certainly doesn't rev as freely or cleanly.
I guess it's entirely possible there is either something wrong with it or the engine needs remapping ???
I wasn't expecting to need a remap though ...........
Mine did not lose any power with the ACT Cherry bomb system. I have mine dyno'd every year at the Griff Growl.
I did however find the cherry bomb quieter than the standard system especially at idle and cruising which I found very useful when I went de-cat. I really like the sound of mine as it is relatively quiet on idle and cursing but loud on acceleration.
I am tempted to have another play around with the exhaust this year. Funnily enough the sound of mine changed when I upgraded the injectors and I have not been 100% convinced yet. I might try the standard system and then perhaps sleeved with wadding left in.
I did however find the cherry bomb quieter than the standard system especially at idle and cruising which I found very useful when I went de-cat. I really like the sound of mine as it is relatively quiet on idle and cursing but loud on acceleration.
I am tempted to have another play around with the exhaust this year. Funnily enough the sound of mine changed when I upgraded the injectors and I have not been 100% convinced yet. I might try the standard system and then perhaps sleeved with wadding left in.
jamienshelly said:
Hi mate, when talking about anything TVR, you will NEVER get a total agreement, this is what makes them so special as they are all different, But even worse is the exhaust mods, cats in or out, sleeved or not, cherry bombs or not, half sleeved and the list goes on with any combination of them all!. my advice is listen to as many of the combinations and make up your own mind and let SWMBO listen also as she may not want to travel x amount of miles with no cats and sleeved system (I count myself lucky that Shelly doesn't mind). Its your decision and only know what is the best soundtrack for you, but if you want pops and bangs its best to loose the cats. Sorry I have sat on the fence, but it has to be your decision and its your hard earned cash that's going to pay for the changes.
This is probably the best advice exhaust, is very much down to personal taste.I wrote a post on my blog when I was deciding on exhaust, it might be worth a quick look...
http://matthewpoxon.wordpress.com/2010/05/04/exhau...
MPoxon said:
Mine did not lose any power with the ACT Cherry bomb system. I have mine dyno'd every year at the Griff Growl.
I'll know more once I get it dyno'd.It's certainly quieter and I like the sound, but something's not right.
I'll be putting the Supersport back on for a direct comparision on the same day.
sgrimshaw said:
I'll know more once I get it dyno'd.
It's certainly quieter and I like the sound, but something's not right.
I'll be putting the Supersport back on for a direct comparision on the same day.
Hopefully it will just be the sound resulting in it feeling slower. I know when I de-catted mine it felt like it had unleashed 30+BHP, in reality it was about 6BHP gain on the dyno. I would be very interested to see what a back to back test shows up on the dyno, supersport vs cherry bomb.It's certainly quieter and I like the sound, but something's not right.
I'll be putting the Supersport back on for a direct comparision on the same day.
MPoxon said:
Hopefully it will just be the sound resulting in it feeling slower. I know when I de-catted mine it felt like it had unleashed 30+BHP, in reality it was about 6BHP gain on the dyno. I would be very interested to see what a back to back test shows up on the dyno, supersport vs cherry bomb.
It won't be for a couple of weeks, but I will post the results when I do it.In general, a badly designed exhaust can reduce power output. Anyone who has visited the scenery in a race car and bent the exhaust will confirm that. However, the cherry bomb system if properly designed should not affect power.
In case it isn't clear, measuring decibels is only relevant if you are thinking of doing any event with noise limits, in which case you need to know how to measure it.
Noise meter 50 cm from each tail pipe in turn, at an angle of 45 degrees up and out from the bumper. Rev engine to 3/4 of your rev limit, say 4500 rpm.
The iPhone app decibel 10th was accurate on my iPhone 4, surprisingly.
The limits differ from track to track, and from day to evening. Generally 98, 101, or 105 dB.
For reference, my 5 litre RV8, fully decatted, Clive Y, standard exhaust is around 104-105. I can get down to 101 by using ACT bolt on tail pipe silencers.
In case it isn't clear, measuring decibels is only relevant if you are thinking of doing any event with noise limits, in which case you need to know how to measure it.
Noise meter 50 cm from each tail pipe in turn, at an angle of 45 degrees up and out from the bumper. Rev engine to 3/4 of your rev limit, say 4500 rpm.
The iPhone app decibel 10th was accurate on my iPhone 4, surprisingly.
The limits differ from track to track, and from day to evening. Generally 98, 101, or 105 dB.
For reference, my 5 litre RV8, fully decatted, Clive Y, standard exhaust is around 104-105. I can get down to 101 by using ACT bolt on tail pipe silencers.
Just to put a curve ball on this one. I consider this mod each year for the past 10 years i've owned my 500.
Just as i think i'm ready I hear someone else driving my car when any service work is done & sounds gorgeous as standard you just don't appreciate it fully when inside. If i'm honest i don't want it any louder inside as it would get tiring on long journeys (which is most), so i always end up backing off.
Typically if i'm out with my like minded friends for a run I tend to only hear their cars which makes mine seem diluted, but then i realise its not & consider that you can't always reverese the mod if its not what you wanted.
Just as i think i'm ready I hear someone else driving my car when any service work is done & sounds gorgeous as standard you just don't appreciate it fully when inside. If i'm honest i don't want it any louder inside as it would get tiring on long journeys (which is most), so i always end up backing off.
Typically if i'm out with my like minded friends for a run I tend to only hear their cars which makes mine seem diluted, but then i realise its not & consider that you can't always reverese the mod if its not what you wanted.
QBee said:
For reference, my 5 litre RV8, fully decatted, Clive Y, standard exhaust is around 104-105. I can get down to 101 by using ACT bolt on tail pipe silencers.
Also for reference, my 4 litre RV8, fully decatted, ACT Y, ACT Supersport was 119 at 4k.The same test with ACT Cherry Bomb is 109.
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