Anyone using a HM Headers Exhaust? or Walkinshaw?

The problem, as I see it is. The law states that changing to a non standard exhaust, of any kind, is not allowed, If your factoy exhaust is worn out, you are also supposed to replace it with an identical spec factory equivallent. Doesn't matter if the exhaust you change to is capable of passing an EPA test. Unless you have it engineered wihen you put it on the vehicle, it's an illegal mod. Not just the catback, but the overall combination of exhaust system from engine to tail pipe has to match factory noise and emissions.

I'm still trying to find one place where this is written in plain english, but it's all interweaved in several diferent ADR rules and sections.

I found this on another V8 forum...

...found out some interesting news, It actually effects all vehicles built past ADR27A
design rule (6/76 built)...you might be interested. I spoke to NSW RTA engineer today and licencing manger for AUVIS (blue slip examninations)
IT is a fact, any exhaust...I repeat....ANY[U] exhaust modification other that that of 100% standard fitment or Standard replacement componants for any exhaust (excluding extractors..they are allowed) is deemed to be a modification and requires an engineers certificate. falls under rule 312. (emmission ruling, covers noise, pollution etc...) 96 db for 76 and under....86 Db for 76 year bult up. Pipe ID, muffler allocation/style/amount of needs to be std, go up in 1/2 inch pipe ID and you need an engineer to pass it, given CO reading printout, noise DB test and structuall report...

Luis, I'm not knocking the work you've done, or disagreeing with the principal, but what do you get in terms of official document, to say that one of these exhausts is ADR approved and legal? just the manfactureres word?

Only solution is, fit a system, such as yours, which you know is compliant, then pay your extra $1,000 or whatever to have an engineer pass it. The car as a whole has to pass an enineers certificate with the exhaust in place.

Quote:

---

Originally Posted by APS Luis

I just cut-paste as I CBF doing links etc..but here is the email header ;)



Hello Luis,

Undertook the noise test earlier this arvo and all seems well to me.

I forgot the instruction on how to close the butterfly valves to test on the single outlet however with the duel outlets open the vehicle comfortably complies with respect to stationary noise of a modified vehicle as far as EPA Victoria would be concerned.

EPA Victoria Quote 90dB(A) maximum

The National code of practice for light vehicle conbstruction & modification document attached is also rather vague with respcet to stating a maximum figure for stationary noise, however the Australian Vehicle Standards (1999) also states a limit of 90dB(A)

We are measuring with all outlets open a maximum figure of 85dB(A)

All seems good to me.

Vehicle shall be ready for pick up anytime tomorrow - I shall not be in but get the tow truck drive to ask for Gavin Mabbutt and he shall assist.

Thanks again

Rob Davies

Project Engineer - Automotive

Vipac Engineers & Scientists
279 Normanby Road Port Melbourne VIC 3207 Australia
t. +61 3 9647 9764 | f. +61 3 9646 4370 | m. +61 (0)403 989 567

www.vipac.com.au


I guess the point is that if you fit an approved, legal & ADR'd system to your car your insurance company has no argument.

---

Hi all.

Ok, so im getting The walki 3" exhaust and hi-flo headers with the bimodal option on my e3 gts.
Just wandering if anyone knows of the bimodal option changed to be fully open as opposed to the factory set rpm restrictions.
Currently, i think it is active up to 2000Rpm, off from 2000-3300rpm, then on again after that.
I hate to lose the sound at the 2-3k mark, so does anyone know of it being done?

cheers.

Kotso, is your Walky system bimodal I assume and is it a definite done deal? :confused: If not I suggest going down to see Luis at APS to check out their HM bimodal. See http://www.ls1.com.au/forum/showthread.php?150552

My guess from other things I know is that the Walky system is possibly just the HM system anyway with a premium price for the Walky name and possibly not even having the variable controller APS have. I've heard a couple of HM bimodals on some friends' E3s and whilst they're not quite in the class of my KPM (not that I'm biased :lol:) they do sound bloody good for a technically legal system. :goodjob:

Doco - NP :)

We have a certificate which shows that the exhaust system & setup we developed with HM Headers for our emissions approved car passes all necessary ADR requirements.

For the record , this system is not the same as the other HM bimodal system we sell

I hope more workshops follow your lead.

This is great, but I'm assuming it still doesn't indemnify you against defects, or insurance assessors, as an engineers certificate has to has to be registered with the vehicle and lodged with the RTA (may be different in Vic?)

Quote:

---

Originally Posted by APS Luis

Doco - NP :)

We have a certificate which shows that the exhaust system & setup we developed with HM Headers for our emissions approved car passes all necessary ADR requirements.

For the record , this system is not the same as the other HM bimodal system we sell

---

evryshop say their system is drone free but it depends on the whole system. i mean size of the catback, header style and tuning. so its just a matter of having right combination. there is big difference between auto and manual.

Ok, so i have kinda answered my own question here regarding the factory bimodal on e3 gts being fully open all the time.

Walkinshaw used to be able to have the EDI reprogrammed to have it open all the time (if ive understood what they said correctly. I believe HSV put a stop to them doing so, so i called Walki and we had a chat.
Whilst the aftermarket APS allows for variable control the Walki EDI fix didnt, but it retains the origal aspect of the car.

What they are going to try and do is a simple bypass switch in the glove box which sends a signal down to the valves to stay open regardless of what the edi is doing.This will allow me to switch it on (i.e. have it fully open) or switch it off (i.e. let the EDI program decided what to do based on which setting you have selected).

I have just dropped it off to them today, so ill let you all know how it goes.

Hi I run a 3 inch Walky exhaust no drone at all and sounds great definatly recommend it

Quote:

---

Originally Posted by Kotso

Ok, so i have kinda answered my own question here regarding the factory bimodal on e3 gts being fully open all the time.

Walkinshaw used to be able to have the EDI reprogrammed to have it open all the time (if ive understood what they said correctly. I believe HSV put a stop to them doing so, so i called Walki and we had a chat.
Whilst the aftermarket APS allows for variable control the Walki EDI fix didnt, but it retains the origal aspect of the car.

What they are going to try and do is a simple bypass switch in the glove box which sends a signal down to the valves to stay open regardless of what the edi is doing.This will allow me to switch it on (i.e. have it fully open) or switch it off (i.e. let the EDI program decided what to do based on which setting you have selected).

I have just dropped it off to them today, so ill let you all know how it goes.

---

Sweet...Got the car back and im happy with the results. Whilst it has a slight drone now (with stock exhaust but EDI fully opened) it has that beautiful V8 rumble throughout the full rev range under any acceleration, as well as that rumble and slight spitting sound in the 2-4K RPM range.

Awesome job, Thanks to Walkinshaw Clayton for the fix.

Love It

Can you provide more details on what was done please...

Quote:

---

Originally Posted by jkgmh

Can you provide more details on what was done please...

---

Ok, so a simple toggle switch was put in the glove box.

Length of wire run under the carpet all the way to the rear muffler (so as to not have exposed wiring)

Essentially thats it. Sends a small current to the soleniod controlling the valve to keep it open.

Since the EDI is programe based, Walki just put in a hard switch with two options....Fully open (on all the time) or Fully closed (let EDI work it out based on the mode selected)

Anything more detailed you will have to call them (03 9265 9700) .