View Full Version : Show us your exhaust!
Allora#2
30-08-2017, 16:25
i start with mine. ;)
Stratie.fr
30-08-2017, 16:45
Ciao Enzo
I think I have already told you that I like yours very much with these gp 4 exhaust and also with the two pipes!
Looks like genuine ones...do you made these ones yourself or do you have a provider in Germany?
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tomsredstratos
30-08-2017, 19:55
Heres mine
Nice tone at low RPM,not loud. And a good bark with a squirt of throttle. Few pops on the overrun :D
Stainless steel cans 12in x 5in. Cones from Ebay Australia.
STR_Strat
30-08-2017, 20:23
Listerbell Grp 4 offering
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Just in the process of fitting a TMAP sensor in the inlet plenum, which is why the Supercharger is off at the moment. Will post some video of it running shortly:)
Stratie.fr
31-08-2017, 09:31
Mk I & Mk II cars
Gp 4 & Transverse exhausts :o
Allora#2
31-08-2017, 10:14
http://www.ebay.de/itm/Universal-Schalldampfer-rund-Edelstahl-63-5mm-100x250-Stutzen-FOX-UNI-31425063s-/400843400589?epid=1682472839&hash=item5d5420e58d:g:Y1EAAOSw7ZlZn93f
http://www.tzr-motorsport.de/Powersprint-Edelstahl-Konus-101-60-/-100mm-symetrisch
i use this parts to build them!
Stop that! You know I haven't got one :p
Strat Fan
31-08-2017, 12:15
A couple of variations on the theme....
1187111872
The single exit system on the 2.5 24v Busso is the nicest sounding car we have built & arguably the closest to sounding anything like a real Stratos with the single note howl. Carbs or throttle bodies could seal the deal!
A couple of variations on the theme....
The single exit system on the 2.5 24v Busso is the nicest sounding car we have built & arguably the closest to sounding anything like a real Stratos with the single note howl. Carbs or throttle bodies could seal the deal!
Can you do something similar for a Corse I ??
ProtoTipo
31-08-2017, 18:48
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That one's winning so far for me.
A couple of variations on the theme....
1187111872
The single exit system on the 2.5 24v Busso is the nicest sounding car we have built & arguably the closest to sounding anything like a real Stratos with the single note howl. Carbs or throttle bodies could seal the deal!
So, I am guessing the single exit system on a 3.2 GTA engine on throttle bodies should sound sort of ok as well :D
Presumably this is too loud for IVA?
STR_Strat
31-08-2017, 21:55
That one's winning so far for me.
Yep gets my vote as well:)
Strat Fan
31-08-2017, 22:07
Presumably this is too loud for IVA?
The Gp4 version would be too loud for IVA for sure, the single exit version no problem.
This one passed IVA yesterday at 97.9dB at a genuine 4500rpm running with a 3.2Gta motor on a stock ECU. Exactly the same silencers as the Gp4 exhaust shown earlier, the difference being that this one is fitted with the phase 3 catalysed exhaust manifolds which go a long way to suppressing the noise.
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Stratos Fear
01-09-2017, 11:05
Nice reg. Craig.
I saw V600 STR a few months back on the DVLC web-site and was going to buy it but unfortunately didnt - I understand it was then bought by someone else on the forum (not sure who )
Love the colour too - cant wait for my body panels !!
Peter
Finally got to fit the stainless steel system I've been working on yesterday. Planning started months ago, the bits have been gathering dust for a couple of months.
It is still a very quiet (neighbour friendly) system, just a little more base tone, and a smidgen louder. Feels like it pulls a little better too.
Lancialulu
17-09-2017, 08:37
Nice!
Strange its still "quiet". Maybe the manifolding contributes some muffling. Is it possible to play with the box stuffing?
Tim, no I don't think the manifolds are a factor, plenty of others use them in systems that are more audible than mine, as far as the box is concerned 'take it or leave it' are the options, no packing or repacking of the box is possible.
The quieter Stratos systems that I have seen/heard on cars regardless of chassis manufacturer tend to be transverse, and none straight through.
Mine being transverse, and one in, two out ticks all those boxes. The box itself is the biggest I could get with clearance between the chassis legs, on the basis that I'm maximising the possible silencing.
Funnily in its (silencer) original four cylinder turbo application the noise is both crisp and fruity, traits which are still evident in my application but not to the same degree.
I think the manifolds merging before passing through a common silencer may also be a factor, with the exhaust pulses from one bank being damped by the pulses from the other bank?
So in effect I'm trading ultimate efficiency for noise suppression. That said the old system was quite restrictive with very small pipe diameters, so the new system is still an improvement.
If my supposition is correct straight through single banked exhaust systems will ultimately always be more efficient, and in consequence (possibly) noisier, but I'm surmising.
Paul Eustace
17-09-2017, 19:56
Here is a slightly different design, Lance from OJZ Engineering built it, Zircotec coated it and Guy Croft Racing specified the tube sizes and lengths. The headers are all the same length and the tube diameter increases after the collector and at the entry to the silencers. The two 120mm diameter silencers enable me to have the longest possible pipe and meet track day noise limits.
It does sound really nice with twin DCOE45's although it is obviously not a V6.....
I must try to fit my GoPro to the rear clam to capture the sound.
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Stratie.fr
26-11-2017, 14:52
Seems like there is a garage day recently in Germany !!
STR_Strat
29-04-2018, 07:32
Just fitted the exhaust system after having it ceramic coated by Zircotec.
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ProtoTipo
07-06-2018, 17:24
Some more plumbing:
https://twitter.com/search?q=%23amigosrally&src=hash (https://goo.gl/images/4N5QiV)
http://192.168.1.252:9000/disk/DLNA-PNJPEG_SM-OP01-FLAGS00d00000/O0$2$20I314370.jpg
Normb666
27-09-2018, 20:15
Ste! It's you! - but you'll have to type up a bit, cos I can't see/hear what you're saying ;)
Is it some sort of image? Won't display on my computer for some reason....
Very nice. Probably should've done mine black. The white on mine already looks dirty and it's not made it out of the garage yet!
Guy Mayers
27-09-2018, 23:56
Photo courtesy of Rhona!
Lancialulu
28-09-2018, 09:55
Very nice. Probably should've done mine black. The white on mine already looks dirty and it's not made it out of the garage yet! I zircotec'd mine black for the manifolds and white for the tail box. Should have gone grey or black but wanted a contrast out of the rear. White does not seem to be able to be cleaned - any ideas other than oven cleaner???
Not really. They say to use water and a mild detergent but doesn't really seem to do much good. I have the white on my Lotus and a good run out get rid of some dirt as it seems to burn it off. Don't ever bleed on it though, got a spot of blood on mine and nothing will remove it! Maybe it's the iron in it.......
Here's mine, standard Lister Bell, but a good photo by a friend at work. No Abarth sticker there anymore, I put it on as it's been on all my cars, but it didn't seem to belong on the Stratos.
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Same question to the one I asked on the other thread.. is there a heat issue in the engine bay that needs something like zircotec on the exhaust to resolve it or is it mainly cosmetic? I’m assuming there’s more cars out there without the coating than with it and engine bay heat temperatures issues don’t seem to be mentioned often? Looks good tho!!
AndyGuyton
28-09-2018, 12:08
Great news for me!! ;)
A couple of variations on the theme....
1187111872
The single exit system on the 2.5 24v Busso is the nicest sounding car we have built & arguably the closest to sounding anything like a real Stratos with the single note howl. Carbs or throttle bodies could seal the deal!
Normb666
28-09-2018, 13:39
Leigh - when you mention blood on yours and iron - this wasn't Herself attacking you with said smoothing implement cos you spend too much time in the garage??
Nope - self inflicted Norm.
It was following a trip into the gravel at Donington. Whilst cleaning gravel out of the car I managed to cut my hand. I then somehow bled onto the exhaust manifold in the engine bay.....
ChrisCar6
28-09-2018, 23:31
It's not proper DIY unless there's blood.
or is it just me?
It's not proper DIY unless there's blood.
or is it just me?
Are you Reg Prescott?
Not sure how old you need to be to get that reference!
AndyGuyton
29-09-2018, 17:28
I remember him well....horrendous!! (but very funny)
ChrisCar6
29-09-2018, 23:39
Are you Reg Prescott?
Not sure how old you need to be to get that reference!
I'd forgotten about him! That's not me...
Martin Crikey
19-03-2019, 22:41
New exhaust now made up and on the car. Its been one of the jobs i have looked forward to. I have bought a tig welder for doing stainless at work. i am not the best but as its wrapped it will be good enough. I have done it in 52mm pipe which i can get left over bends from work and Craig's silencers . The best bit now is its so easy to take on and off. the old system was a right pain. The down side is that its quite loud. I have some small cats that might fit in the silencers ( Not Kittens), so not sure if this will help.
I shall wait till next month when the car is taxed and a full road test can be done.
No animals harmed in this rely
Two-Eight-Six
20-03-2019, 11:08
That looks great, and I like the silencers!
Re exhaust wrap, I was always warned - and found in practice - it can harbour moisture/cause rust on the manifolds?
Two-Eight-Six
09-06-2019, 10:55
Silenced @ Sledmere:
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As some of you may have noticed my car was Bicester Heritage over the weekend, when they held the last Sunday Scramble of the year.
I had left it with Ryan Edwards (Wizard of Oz), for him to work some magic
As a semi-retired gentleman, I went down today, and we finished the manifolds off, all fitted, and I was on my way home just after 4:00pm.
Interestingly, the oil temp took longer to rise, and at light loads/cruising it seems to run 10/15 degrees cooler, I can only think the new arrangement doesn't transfer as much heat to the gearbox casing?
A couple of variations on the theme....
1187111872
The single exit system on the 2.5 24v Busso is the nicest sounding car we have built & arguably the closest to sounding anything like a real Stratos with the single note howl. Carbs or throttle bodies could seal the deal!
With single exit system, are you referring to the lower one? Reason for asking is you mention this sound most like the real. But don't they usually have the setup of the upper picture?
I've recently built a new stainless system for my -84 Alfa GTV6. I haven't started the car yet, so haven't been able to compare the sound. But instead of collecting the two parallel pipes exiting the first muffler with dual in- and outlets, the system is parallel all the way. But, I did add a X-pipe just before the dual muffler after being recommended to do so. To get the "Brrrap" instead of a "Boap".
(I also did a set of two parallel pipes with fittings at each end to simply replace the dual muffler) ;-)
I see some have a T-arrangement (from LB?). Split at the center and running paralell to the transversal bar of the frame. Which would in some sense be something like a X-pipe. How are they collected? Maybe these cars all run turbo?
But to me, listening to real Stratos having the arrangement in the upper, it has quite a crisp sound if you ask me. You wouldn't have sound/videos to compare these two...?
:D
Maybe this is a good comparison of sound between single and dual exhaust from otherwise the same engine?
;-)
https://youtu.be/WXQVfOmSzwc
Strat Fan
13-02-2021, 23:10
Maybe this is a good comparison of sound between single and dual exhaust from otherwise the same engine?
;-)
The issue Patriq is that the Alfa has a completely different bore to stroke ratio when compared to the Dino engine. The Alfa's have a longer stroke and probably milder cams.
Even the 2.5 Alfa whilst having roughly the same capacity compared to the Dino has a much longer stroke and a smaller bore. The Dino has a 60mm stroke mated to a 92.5mm bore (2419cc, 1.54 ratio) whereas the 2.5 Alfa has a 68.3mm stoke to an 88mm bore (2492cc, 1.29 ratio)
This gives the Alfa a deeper sound on the short exhaust and therefore a different exhaust note. You could bolt a Dino exhaust to an Alfa engine but it would still not sound like a Dino engine.
The "X" pipe is fitted to the LB exhaust to try to sweeten the sound and/or raise the tone but I find the single exit exhaust is the best way to achieve this.
Clearly most people want the classic twin tail pipe look that the Maglioli's cars had but the University Motors cars went down the single exit route and merged the banks by the right rear wheel.
That is the beauty of building your own car, you get to choose, unless emission or noise regulations take over....
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Thanks Stan!
Thanks for that image above!
Yes, I'm quite aware that these two engines (Ferrari/Alfa) are different - and hence also sounds different. Might not be apparent, but theses things you mention naturally makes a difference. But my angel was more, did the exhaust that had the pulses either merged with an X, or merged in another fashion and then split with a T later to dual exhaust (but hence still merged), a sound for the Alfa engine that was more like the dual exhaust of the originals?
Hearing the differences in the clip I posted, the single exhaust on the Ferrari engine, had more of the "Formula One/Wasp" sound. But the merged exhaust on an Alfa makes it sound more like the dual exhaust sounds of the originals?
And how does an X-pipe exhaust on an Alfa sound, compared to a dual exhaust on an Alfa?
How/where are the two banks merged on the LB exhaust which has a T-later on to split into two exhaust? Is this just to effect the sound, or is this for cars that runs a (singular) turbo, but still wants dual exhausts...?
These three images I've found previously, would for me be the three principal routes I see to go. And I would really like to hear a comparison before finally deciding.:)
I like the bottom one :cool:
https://i.imgur.com/yQnHSCG.jpg
Guy Mayers
16-02-2021, 10:56
Ah, the noisiest one!
That airbox looked nice!
Is it your car? Where does the airbox come from? LB?
The car is an LB? Would the rear inner sills/mud guards for the tires fit on a Hawk frame as well...?
Maybe it is the same car in your post and the one in mine?
Ah, the noisiest one!
Haha, I'd be happy with that :o
That airbox looked nice!
Is it your car? Where does the airbox come from? LB?
The car is an LB? Would the rear inner sills/mud guards for the tires fit on a Hawk frame as well...?
Maybe it is the same car in your post and the one in mine?
Yes, it's my LB STR in both photos.
The airbox does look great and is an LB creation.
Unfortunately I've no idea about the sills/mud guards, sorry.
Haha, I'd be happy with that :o
Yes, it's my LB STR in both photos.
The airbox does look great and is an LB creation.
Unfortunately I've no idea about the sills/mud guards, sorry.
Thanks!
You wouldn't have a sound clip of that exhaust somewhere?
That airbox works with the ITB´s they have a setup for with the BMW parts?
Thanks!
You wouldn't have a sound clip of that exhaust somewhere?
Unfortunately I don't. The car's still down with Craig. If he gets a chance he might record a sound clip but if not I'll do so when I get the opportunity.
That airbox works with the ITB´s they have a setup for with the BMW parts?
Yes, it's the LB ITB setup that the airbox is mated to.
Unfortunately I don't. The car's still down with Craig. If he gets a chance he might record a sound clip but if not I'll do so when I get the opportunity.
Yes, it's the LB ITB setup that the airbox is mated to.
Thanks, will be looking forward to it!
Best with the volume up
https://www.youtube.com/watch?v=SbV038BtMoo
Very nice!!!
Love the "snap, crackle, pop"!
AndyGuyton
23-03-2021, 20:23
Phwooooaar!
I have one like that to go on after IVA until then it's quite a bit tamer........:rolleyes:
https://www.youtube.com/watch?v=RW_XDr4-Zhk
Iowstratos
23-03-2021, 23:05
The mufflers are under the heat shield.
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In action...
https://i.imgur.com/5kW2N28.jpg
Think of the baby polar bears you brute!
Think of the baby polar bears you brute!
Bear BBQ... as opposed to bare BBQ which could of course be ouchy.
Stratos Fear
27-03-2021, 19:39
Back in the day wasnt it the Alpine Renaults that had a butterfly valve system that diverted the exhaust through the silencer for when they passed through towns and villages in the middle of the night?
Longtimefan
27-03-2021, 23:37
Back in the day wasnt it the Alpine Renaults that had a butterfly valve system that diverted the exhaust through the silencer for when they passed through towns and villages in the middle of the night?
Works Alpines, yes.
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