[buddy]

Hi Dazz,
          I know it was a long time ago, but do you still have that custom exhaust?
                                                                                             Pat
                                                                                             New Norfolk.
             

[Dazzler]

I've still got it on my Diesel. I am thinking of putting the original back on when I get new tyres in the next couple of months .. you could have it for $100 bucks if you want it and ever get up this way 

[Dazzler]

Sold...When I get around to switching back to the original (Cheers Buddy AKA Pat  )

[G14Classified101]

Hey guys, just read the topic, well not really just skimmed through it. I never read the Diesel coz i have a petrol model. Its funny you say that you have new found torque, because the engine is actually limited to 86kw and 256nm.

Fast fours or hot fours did a test on it and could only get one extra kw and nm torque out of the engine. They tried various exhaust configs, intakes, everything bolt on possible. Until they found out that the cpu will not let it breach 86/256. It took their techs about 20 mins to hack the hyundai system and remove the restriction where they were able to get it to about 91odd kw and 280nm torque.

[Dazzler]

I have never claimed any performance gain for mine (just a more sporty sound under certain conditions)..although I'm hoping it doesn't seem sluggish when I swap back

[G14Classified101]

Yeah, I was enjoying the newfound 'extra' torque that comes from a freer flowing exhaust and turbos!  

Will see what I can do for a video.

When I had the exhaust made, I made sure that the old one can easily be bolted back on. (Nothing on the factory exhaust was cut) 10min job, tops, to change back to the stock exhaust.

EDIT: Modder of the month, LOVE IT!  <img src="{SMILIES_PATH}/icon_lol.gif" alt="" title="Laughing" />

Yeah dazz i know you didnt but thumper did...

[Dazzler]

Yeah dazz i know you didnt but thumper did...

 

I think Thumper's performance gain was actually a combination of things (it was almost like he had a blueprinted motor some of the results he was getting)

[Lakes]

i have not got the sport muff on my car now as did not want issues ( insurance & warranty ). the dyno test they did confirmed not much of a power gain, but they did not test spool up time, like the time it takes to make power and tq. but i got into too much trouble  talking about that b4.
i,m happy with how my CRDi runs stock as i'm useing it for  economy and the distance i can travel on one tank. so i'll leave it as it came.

[G14Classified101]

Oh okay didnt realise he had other mods too.

however the only realy gain they would get would be as lakes said increase spool up, however you guys would be at full boost before like 1800 rpm yeah? dont need much quicker than that!

[Lakes]

Oh okay didnt realise he had other mods too.

however the only realy gain they would get would be as lakes said increase spool up, however you guys would be at full boost before like 1800 rpm yeah? dont need much quicker than that!

hi m8, love talking about tuning and so on, but i've always done it to use at a race track.

i got the chance to use a friends dyno a lot with my bike, then go to the lacal track and test, i found if i just tuned for max power not timing how quick it made the power & torque, i might not see an improvement in times but could see a gain in trap speed after a quarter mile. then i started to test the effect timing each full throtle run on the dyno, i would have a load on the dyno wheel the dyno i used has a adjustable magnetic load. i would put it in top gear bring rev up to a rev that would not damage the motor giving it wide open throtle with a load on. then i would use the tune that made the most HP & Torque the quickest, i was only keeping throtle wide open for 5 seconds or less, then went to the track and tested and would see a gain like a quicker time and faster speed. but thats at a drag strip, land speed trials i might do it differently. i'm no expert just hands on self taught.
i felt there was a gain, but i must admit, i have seen other people with different cars or truck or bikes do things to them and get very excited about how they go, then they go put it on a dyno and they are a broken man, no gain, also they can be broken going to the track and not doing a very quick time. so i could have been mistaken . now its been so long since i had it on i've forgot, maybe when Dazz removed his we might know.
cheers

[penak]

Generally most of the rules of tuning non-supercharged petrol engines don't apply to turbo diesels at all.

In a petrol engine you can do a lot by removing restrictions from the induction and exhaust sides of the system. But more importantly, if you can understand the hairy and growling mathematics behind acoustic resonators, you can achieve effects closing to supercharging with variable length intake manifolds and carefully calculated exhaust manifolds.

But most of that just don't apply to diesels that are even in principle VERY different from otto-cycle engines.

In otto-cycle engine (ie. petrol engine) you try to keep the fuel/air mixture at constant optimized percentage through the whole power range. The power adjustment in otto-cycle engine happens by adjusting the amount of the fuel/air mixture delivered to the engine. Supercharging increases power up to the point where the mixture starts to ignite and detonate prematurely by the compression alone, where you get the "pinging" and power starts to drop. Contrary to a common belief, normally the fuel/air mixture does not detonate in a petrol engine, it burns in a controlled manner, and same is true for a diesel too.

In a diesel-cycle engine the throttle flap is not even needed for controlling the engine. The power adjustment is done by adjusting the amount of fuel injected to the cylinder for each work cycle, and the power increases up to the point where the burning of fuel has used all the oxygen from the induction air. By supercharging the amount of air in cylinder can be increased, and unlike otto engines, pinging is not the limit, as you WANT compression ignition,limit is the mechanical sturdiness of the engine to take the high pressures, which however never are like the huge explosion pressure spikes you will see in a pinging otto engine.

In a turbo diesel, what you do to the exhaust system AFTER the turbo has very little if any effect on the engine power or turbo spool up time if we keep some sensible values. Contrary to a common belief, the turbo does not run much on the pressure differential between it's intake and exhaust, but on the energy contained in the temperature of the exhaust gas.
Even putting a well dimensioned megaphone just on the exhaust of the turbo would not change the spool up or power of the turbine much.

Face it, these sport exhausts only give sportier (and slightly louder) exhaust note. Any other effects are firmly on the placebo department. The famous "seat of the pants" is so easily deceived...

[eyecon]

Well said penak. I agree with everything you said.

[IMCRZY]

^^^^ What he said

[Dazzler]

I am swapping back to my standard exhaust at the 60,000 service later this month after about 18 months with a sports exhaust on my CRDi. I will probably miss the sportier note but unlike Thumper and one or two others didn't ever notice any significant improvement in performance which I was initially lead to believe would occur (although warned by others this was not likely)

[andrejs]

well, after every modification you should measure your hp and NM to see real improvements

only changing your exhaust wont help much if at all...

change intake, change intercooler, change turbo and change exhaust... that will do the trick

[stuart b]

HI I also live in ACT can you tell me were you got mods done
cheers

[Dazzler]

HI I also live in ACT can you tell me were you got mods done
cheers

Hi Stuart (A big welcome to the club if I haven't done it previously)

Just go to midas or your other local exhaust fabricator and ask themto duplicate you existing cat back exhaust section with a straight through sports exhaust say 2' or larger.. will improve the exhaust note without making it too noisy....(don't expect any noticeable increase in performance)

[rustynutz]

When the rear muffler rotted out on my old Barina I had a hotdog muffler custom made and this worked a treat. Only a little noisier than stock and it lasted forever. When the middle muffler died I simply replaced it with a hotdog muffler as well and was surprised at how quiet it was considering the exhaust was basically now straight through from the catalytic converter back...(it also sounded good too...bonus!)

It's amazing what you'll do when you haven't got the dollars for original mufflers... 

I reckon I might even give a hotdog muffler a try on my i30 when it eventually rots out....

[agentr31]

the catalytic converter is a really good muffler, till they crumble... then they just block everything up!

on the diesel you can run no muffler... its not noisy at all, i deleted mine a few weeks after getting it, and its  very quiet still! (well for what im used to)

[eyecon]

Hey have you noticed any performance increase with the muffler off?