ThePog Posted July 15, 2022 Share Posted July 15, 2022 You should, the things he does with graph paper makes me diamonds. Edit; Probably my weirdest totp fail comment. 1 7 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted July 17, 2022 Author Popular Post Share Posted July 17, 2022 Exhaust investigation. I think this really is one of those scenarios where, if you want a big exhaust that flows good and doesnt make your ears bleed. There's just no way around it. You have to spend the money. I've been tempted to bitch out and just put a 2.5" exhaust on it, or smaller. As smaller pipe is a bit cheaper and it will help keep it quieter. But I think this would be a real disservice to the amazing work KPR has done on the manifold, and others who've contributed to see this project progress! I'd also always be wondering "what if" and I'd hate to save a tiny bit of money and then potentially leave some power on the table. Even if it's not much. Also, this car has an absolutely gigantic amount of room and a super easy exhaust path. So if any of my cars will ever be capable of it, this is it. haha. So, first things first I had a Toyota flexible flange ball joint thingy welded to the 2.5" part of the end of the manifold. All fits up great. (Thanks Rhys) The other half of the flange that I need to weld to the remaining section of the manifold. This was still on the exhaust on the Carina. So I yanked that out, and figured I may as well jam the whole thing on and see how loud it is with a long pipe and a single resonator on it. Answer: still way too loud, haha. I wont be getting invited to any Christmas parties at this rate. This is a fairly flogged out Chase muffler that I've repacked once because all of the innards flew out. So not exactly the pinnacle of muffler performance. However it's also worth noting that it basically sounds the same, but quieter. If it can end up quieter but still sound like this, it's gonna be cool as! So I think the only way I'll manage to get away with anything decent will be to use good mufflers. Adrenalin R seems the option of choice for everyone that ever has trouble keeping the noise down. They are expensive, but so is buying cheaper stuff then having to redo it. So my current plan is to buy the longest straight through muffler, and mount it not far after the extractors. Then see how obnoxious it is. If it's awful, then I can still put another muffler on the back. Even if it's a cheap/shitty/restrictive twin loop one or something. However this leaves the option of being able to easily fit a side pipe for drags and so on, if I put a second flange in a good place. I measured how much space I've got after the extractors, and thankfully I'll easily fit a 550mm long muffler in there. I'll double check that a 7" diameter barrel will fit though, once I've got the taller engine block back in. 8" or 6" diameter barrels are also optional sizes . It would be good if I could fit 8", I'm guessing it would keep the noise down a bit better. The next steps are to get the second half of the flange mounted to the expansion cone, then weld some amount of 3" pipe onto the back of that. Then order a muffler, and get that welded in place. Then work on the next section. Might take a while this way, but will get there. I'm not quite sure what radius the 3" bends will be, but it looks like there's still plenty of allowance anyway. I quickly sketched up the dimensions of everything. Should be sweet. I might actually be able to sneak a second short muffler in that intermediate bend part too, depending on radius of the bends. 26 2 Quote Link to comment Share on other sites More sharing options...
deankdx Posted July 17, 2022 Share Posted July 17, 2022 2 hours ago, Roman said: However it's also worth noting that it basically sounds the same, but quieter. If it can end up quieter but still sound like this, it's gonna be cool as! video not loading how about the switchable mufflers that have a straight through or bypass in them. VAREX a mate of mine has one on his 408ci V8, (after being scalded by the cops in a drive through breath test who couldn't hear themselves think with the prior mufflers, it's now mild V8 sounding at idle/low speeds for coming or going from home etc) https://xforce.com.au/varex-mufflers/ 2 Quote Link to comment Share on other sites More sharing options...
cletus Posted July 17, 2022 Share Posted July 17, 2022 In the time I was doing exhaust certs, I only ever had 2 ported rotaries pass with a fully legit exhaust (ie no silencer bung things or restrictor plates) and one of them was all adrenalin r mufflers , 4 resonators and a big one at the back I've got one on my green car and it seems to work really well for a single 3.5" 8 Quote Link to comment Share on other sites More sharing options...
Roman Posted July 18, 2022 Author Share Posted July 18, 2022 Oddly any variable/adjustable exhaust like the varex ones are illegal in NZ. Unless factory fitted. At least thats my interpretation of it. It would be a nice solution, you can buy cheaper exhaust throttle type things that just close a butterfly. 1 Quote Link to comment Share on other sites More sharing options...
GARDRB Posted July 18, 2022 Share Posted July 18, 2022 16 minutes ago, Roman said: Oddly any variable/adjustable exhaust like the varex ones are illegal in NZ. Unless factory fitted. At least thats my interpretation of it. It would be a nice solution, you can buy cheaper exhaust throttle type things that just close a butterfly. Don't both routings just need to be of legal volume? If only we had a certifier in this thread somewhere.... 1 Quote Link to comment Share on other sites More sharing options...
Early jap nuter Posted July 18, 2022 Share Posted July 18, 2022 Those bypass/cut out mufflers are heavy as 1 Quote Link to comment Share on other sites More sharing options...
Spencer Posted July 18, 2022 Share Posted July 18, 2022 Good to see we are on the 3" or bust train. It was settled many moons ago that small engines need 3" pipes minimum. Yeah use a tailpipe bung thing maybe then whip it out to run 12's 5 1 Quote Link to comment Share on other sites More sharing options...
cletus Posted July 18, 2022 Share Posted July 18, 2022 I've got a rear variable muffler/s off a clubsport or something if you want one to cut up or otherwise muck around with @Roman They have a vacuum operated flap in one of the tailpipes, my interpretation of the rules is as long as it's not controllable from inside the car its OK, I was going to make a muffler that was straight thru under boost but went through a quiet bit under vacuum but I cbf and bought a normal muffler instead 3 Quote Link to comment Share on other sites More sharing options...
Roman Posted July 18, 2022 Author Share Posted July 18, 2022 The factory vitz rs rear muffler has a spring loaded flap inside it. So its a triple pass muffler until the pressure gets high enough, then the flap opens making it straight through. Pretty cool. A lot of toyota mufflers do this on later stuff (like altezza, celica etc) You can buy mufflers like this from Chase. But not sure if in 3". Also the available space at the back really needs a circular muffler not an oval one. But yeah, also it might not be even necessary. The carina ended up way quieter than expected with straight through mufflers. EDIT: These are the type I was thinking of, not to spendy or heavy. Looks like this one might even have a position sensor on it? EDIT2: Oh nah, it's just got a 3 wire plug so it can reverse the polarity to open or close it. If I wasnt using e-throttle, and could mount a position sensor. You could control a DC motor like that with the H bridge in the ECU that normally runs e-throttle, to get a variable position on it. But, I guess you only ever really want it open or closed. meh. EDIT 3: Ones like this could be good, just use a VSV to give it vacuum or not. Then no electronics near it to cause issues. EDIT 4: This one specifically could earn its keep, hhmm! Might get one. It's normally open, and only needs around 3-5psi to start shutting. So even with crappy vac source from ITB it will be fine. 4 Quote Link to comment Share on other sites More sharing options...
Popular Post Dudley Posted July 18, 2022 Popular Post Share Posted July 18, 2022 Sounds like your actually looking for a supertrapp? 8 4 3 Quote Link to comment Share on other sites More sharing options...
Roman Posted July 18, 2022 Author Share Posted July 18, 2022 Everyone needs a supertrapp in their life 2 Quote Link to comment Share on other sites More sharing options...
chris r Posted July 18, 2022 Share Posted July 18, 2022 I sold a bunch of adrenalinr to the Honda people at my last job, after chatting with adrenalinr a few times the recommendation was nearly always the adr019 louvre baffle https://adrenalinr.com/shop/louvre-baffle/ Bigger body is better for quiet of course. If you just want something livable on the street and not after max powah for street setup then a turbo flow/triple pass rear muffler will do the job. I've for a fairly small cheapie on the orthia and it's perfect as a daily. Edit: I've also fitted a adr019 to the tonner with a cheaper m&h flow master copy muffler and its pretty quiet/sounds good as well (only 2.25" tubing and 2.5" reso) 4 2 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted July 22, 2022 Author Popular Post Share Posted July 22, 2022 I ordered a 550mm x 6" diameter barrel muffler from Adrenalin R earlier in the week. It turned up today, and I'm glad I didnt try stuff a 7" one in there! It should be pretty good and tuck up nicely, but I need to trim the heat shields a bit where they taper in around the factory muffler. So I'm gonna take this over to @Geophy tomorrow to get welded onto the flange and front piece of pipe. Then during the week next week @Stu has said I can borrow his spare tig setup, so I can tack together the rest from there. However I dont think I'll try fully weld it myself. At the moment with the muffler just stuffed onto the front pipe, so not sealing at all, it sounds remarkably like a VW beetle or something haha. I'll double check the cam timing over the weekend on this 1300 motor, something is seriously wrong with it. It can barely rev out. Hopefully it's the cam timing and not a damaged valve guide or something. Would still like to use that head if it's alright, and would be interesting to see how the 1300 motor goes. Currently it's a bit too loud still, but defnitely a lot better than without it. Also amusing was chopping up the factory pipe to see what's inside - weird stuff, and no packing. Had I just blown all of the packing out of it perhaps? Speaking of such things, this is what the cat converter looked like... Not even any trace of it left haha. 18 4 Quote Link to comment Share on other sites More sharing options...
Popular Post cletus Posted July 22, 2022 Popular Post Share Posted July 22, 2022 It does sound like it's misfiring/not running on all cylinders when it's cranking does it sound like compressions are even? Ie does it go kerururururururu brmmmm Or kerururirurururiruru blub blub blub 8 1 5 Quote Link to comment Share on other sites More sharing options...
Roman Posted July 22, 2022 Author Share Posted July 22, 2022 Yeah it cranks over fairly evenly, doesnt seem to be an issue. I might test these injectors as well, maybe one is a bit blocked or something. But what makes me think its cam timing is that when I took it for a drive with standard exhaust on, you go over 50% throttle and it just goes absolutely nowhere and makes this horrid sounding induction noise. On the timing chain for the 1.5 litre motor, its got bright yellow links on the chain to show you which ones to line up to the crank and pulleys. On the old motor they were only slightly different colour to start with, and then after 200,000km they were indistinguishable. So I might have it wrong. However I've since found a picture of a brand new timing chain and counted the number of teeth that the crank is away from the intake pulley. So easy to check 2 Quote Link to comment Share on other sites More sharing options...
Popular Post RUNAMUCK Posted July 22, 2022 Popular Post Share Posted July 22, 2022 49 minutes ago, cletus said: does it go kerururururururu brmmmm Or kerururirurururiruru blub blub blub If quoting people out of context in your signature was still the trend here, this quote would totally be going in mine. 6 1 4 Quote Link to comment Share on other sites More sharing options...
Yowzer Posted July 22, 2022 Share Posted July 22, 2022 Those noises play out in my head perfectly 4 Quote Link to comment Share on other sites More sharing options...
keltik Posted July 22, 2022 Share Posted July 22, 2022 I'm immensely satisfied you got the right number of ruru between the ri 3 1 4 Quote Link to comment Share on other sites More sharing options...
GARDRB Posted July 22, 2022 Share Posted July 22, 2022 2 hours ago, keltik said: I'm immensely satisfied you got the right number of ruru between the ri Makes me wonder what other car noises he can transcribe Quote Link to comment Share on other sites More sharing options...
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