Building an exhaust

[Behold81]

So I'm about to build a H-pipe for the Holden. It's part one of building my 3inch system.

Should the H be 3 inch too or thinner?

Also as I have no cats and don't need cats. Should I move the H Pipe nearer the headers? Is there a calculation for that?

Thanks

[Behold81]

j666eds said:

http://www.superchevy.com/how-to/exhaust/1504-x-an...

Perfect! Thanks.

[Behold81]

OverSteery said:

Can't help much, but please keep us updated.
I assume this is for the GTS? I don't know the history of my system, but its seems a quality job and sounds wonderful, say of you want me to take photos of the routing etc for you to consider.

Why no Cats?
Are you going to fit a cut-out

Yes for the GTS. There is nothing wrong with my Wortec 2 1/2 inch system other than I want to have a H Pipe for sound reasons and my headers are 3 1/2 inch exit. If I'm going to build a new section I might as well go 3 inch. much larger is not needed and clearance becomes an issue. at the moment I have it in quite mode (centre boxes in) buy I have an idea for a varex bimodal system.

Using these http://parts.parts.s3.amazonaws.com/106304/VMK16-3...

This will allow a single pipe to be straight through or silenced with out being dual sided like the newer monaro's and VXR8's are. once built I can sell my Wortec system and probably break even at least. I will likely still have a rear box (although we will see how the centre boxes perform) for now its just the H-Pipe. Baby steps.

You don't need cats legally on the GTS unlike the monaro as it was never sold in the UK so was not EU Approved. this means it is not tested as an EU regulated car with CATs but as an import. as it was imported in such small numbers it is not on the MOT DB and has no emission to be tested to. this means it will be tested as a PRE cat car. Some centres stick it under monaro tests and they need to be educated! I have a good tester that I use so its not an issue.

on a side note I have also had a copper stop me saying that if he got under my car he could impound it for not being a BS stamped exhaust. I told him he is right it is not BS Stamped but it does not need to be. the conversation when on for a bit before he realised its an import and he should just move on before I report him for time wasting. To be honest he also didn't question his ANPR that though my car was a Renault 5.

[Behold81]

OverSteery said:

Hmm this thread is full of goodness....

VAREX is new to me, and I am thinking a rather more pleasing solution than a Cut-out.

I have yet to MOT my car. I know a 'good man' who often can help me through emissions tests and I was wondering if I would need his help, but clearly not.

you say "it was never sold in the UK so was not EU Approved". How did LSV manage the process foe the 60 odd GTS(R)s that they sold? was it through SVA or something? Obviously its too good for the rest of Europe.

What was your copper talking about? Did he actually mean BS as in British standard? Whilst regretful, the world doesn't now show such respect of our institutions.....

My car appears to have a couple of cats thanks to H5V VE (he's a bit sensitive if I don't show appreciation of his excellent period of ownership and generosity of letting me own it ) and a rear box. Whilst not overly loud, I think its sounds great. Interestingly enough it conforms some of the words of the link posted, having a X cross-over its a more refined and less US V8 sound than I'm used to.

I'm not a fan of cutouts. I know a lot have them and yes there a great way for the great sound. I just like my fumes to all come out where the exhaust exits.

the varex box normally is single in twin out. one is silences the other open. when the second pipe is open the exhaust comes out the path of least resistance. but for us single sided blokes its no use. I found they do these so want to try them. about 500 for a pair.

my HSV sounds racy not burbly enough. hoping the H will solve that.

You might find you have a Wortec. it was the main system most of these were fitted with. you might have the centre boxes in and need the loud mode pipes (just no boxes)

and yes British standard mark! his partner was giggling behind him each time I called him out!

[Behold81]

Yeah exactly it still has to pass it never struggles with it. Passes fine on that basis.

[Behold81]

2woody said:

I built an entire 3" system - and was surprised how easy it was.

I put two sets of flanges in at approximately where the cats would have been, so that I can have a separate piece with a cross-pipe.

Any pics?

[Behold81]

MyM8V8 said:

Why did he stop you? Because it was a funny shaped Renault 5?

Becaus the Renault 5 was untaxed , no mot and uninsured

I proved tax as this was when we still had them on the screen. I had the mot in the car as it was done earlier that week. I explains the tax was only 2 days old and I would have needed insurance. He was adamant I was lying and his DB was accurate.

Then he told me this is a blue Renault 5 and I burst out laughing.
He did not like that! Only just mot'd I knew he would find nothing in the car so I mildly mocked his car knowledge. His partner found that funny!

[Behold81]

MyM8V8 said:

That's more to do with the firing order which is not old school V8.

Old 1-8-4-3-6-5-7-2

LS's 1-8-7-2-6-5-4-3.

That is true but a h-pipe does give some of it back. And helps the more oldschool some. But so does a cam.

[Behold81]

Behold81 said:

That is true but a h-pipe does give some of it back. And helps the more oldschool some. But so does a cam.

Interesting point on the wrap. That's tempting to do.

But do you not risk cracking them?

[Behold81]

stevieturbo said:

TBH that sort of thing should be reported as harassment. And there should be zero tolerance to incompetence from the police like that

It did get close to that. but being a arse back to him with out being over the line is fun too! but I have reported officers in the past for just this kind of pointless time wasting.

My favourite play is asking them to hold on, go to the car and grab a pen and paper and walk round their car inspecting it. they get quite arsy over it and start telling me that I have no right. I tell them that they are pulling me over for no reason and trying to pin something on me. So I'm in my right to make sure they are fully road legal to fine/prosecute.

Most of the time they finish up quickly just move on and say I think we are done here.

I do hate time wasters.

[Behold81]

mfp4073 said:

I think you have to understand that the police have to deal with total lying Pri*ks every shift. Like it or not sometimes it gets the better of them.Giving the police a hard time is not a good plan.
Don't forget most tossers they deal with really are up to something.

John

I disagree I should accept that I can be treated like that. He told me I was lying about having insurance and having an mot and that my tax disk being a few days old proved very little. Had he used just a small level of knowledge he would have known his ANPR was wrong. Even if he was that bad with cars (for a traffic controller seeing cars all day) he has eyes to check the ANPR vs my actual number plate.

He ran a check 3 times one via radio and still failed because he trusted the ANPR. Had he not mentioned the make model he thought it was he would have impounded my car for no reason and wasted a lot of taxpayers money and police time.

It's not the first time I have been pulled for no reason or because a officer wants to boost his ego or numbers.

I have been either pulled myself or in the car for so many dumb reasons.

Fog lights being on on a foggy night
Accused for walking away when we parked up and no lights or siren to say he was pulling us
Not wearing a seatbelt and being told we put it in. (Beige belt on beige suit)
Pulled when not even driving and accused for being a white cavalier driving at speed with lights off (we were in a gold Carlton!)
Overtaking a officer at 60 on a overtaking lane
Being nearly hit by a copper in the wrong lane on the roundabout. (Him not me had to take him to the roundabout to show markings!)
Full strip down and drug search for not having a wallet on you.


The list could go on

So no most do not earn any respect.

But if they have a reasonable purpose to stop and keep to the point I will not take the piss.

[Behold81]

mfp4073 said:

Well guy's we have to agree to disagree, I think it all depends on which side of the fence you experience the world.

regards John

That's fair enough. I respect that is your view. Even if it's wrong!

[Behold81]

MyM8V8 said:

Have to agree with this. I always find it best to just be courteous and move on.

From your previous comments I wonder if you are on some kind of list for giving them a hard time?

Unlikely as some have either been in a car not registered to me or still registered under the previous owner at the time of being pulled. Or as a passenger. Not all are me being pulled.

Most are really late at night when they are bored I swear.

[Behold81]

Wolfracer said:

If you know the law inside out, you know how to bend the law just the right amount. You also know how to use technicalities to your own advantage. You can also find easy targets to fill your day and get your weekly brownie points.
I once accelerated away from a cross roads in the early hours of the morning. A cop on the opposite set of lights stuck his blues on and came tearing down the road after me.
He said "I've had to do nearly 80 mile an hour to catch up with you. You were speeding"
I wasn't as there are cameras on that stretch. After I agreed with him that yes, if he had set off later than me then obviously he would have to travel faster than me in order to catch up, he did a check on the car, then asked to see my licence.
I was in factory overalls at the time. I said yes, no problem, I'll get it out my briefcase... "briefcase?" He said puzzled
yes, briefcase, I'm a recruitment manager...

"Well that all seems fine sir, sorry to have troiubled you... you understand we have to do these checks and it did look like you were going some, anyway good day..."

WTF?
Talk about judging a book eh?

Yes full details of my stories are for a camp fire?

I have lots more stories, but more for around a camp fire with close friends than on an open forum.

[Behold81]

Looks good. I'm mig welding mine with stainless wire. Got other issues to sort first!

[Behold81]

stevieturbo said:

Lambda sensor is looking in a rather precarious position ?

Both sensors should be 45 degrees above horizontals to minimise moisture or fuel getting on them.

But the right one is open to being torn off on the first hump.

[Behold81]

fred bloggs said:

Thanks for all the positive comments internet experts.

Yea one lambda points down slightly,but the bottom of the cat is lower,as is the gearbox mount.

You really do want to move them. They will fail prematurely at that angle.

Otherwise lovely job.