Popular Post ALUNOX 38 Posted April 20, 2020 Author Popular Post Report Share Posted April 20, 2020 I'm starting a thread highlighting some of the work that goes into the manifolds for those of you that might be interested! 3 Quote Link to post Share on other sites
ALUNOX 38 Posted April 23, 2020 Author Report Share Posted April 23, 2020 Hi, Thank you all for your orders so far, we are going to close the group buy at the end of the month, as such I would encourage anyone else intered to please get in touch ASAP. Realistically I can't see us doing another group buy until next year so don't miss out on some great savings! Thanks again for all the orders and support! All the best, Ben Quote Link to post Share on other sites
jcslocum 97 Posted April 23, 2020 Report Share Posted April 23, 2020 We installed the Aulnox system on our Turbo and it's very very nicely made and will probably never wear out. The welds are beautiful and the fit was pretty good. Took some fettling to get onto the engine because we did it "engine in car". Here's an interesting video of unlocking power with better exhaust; https://www.enginelabs.com/engine-tech/dyno-testing/baby-got-back-turbo-exhaust-size-comparison-test/ You will not regret this purchase. Jon 2 Quote Jon - 1984 Esprit Turbo Link to post Share on other sites
ALUNOX 38 Posted April 27, 2020 Author Report Share Posted April 27, 2020 On 23/04/2020 at 17:22, jcslocum said: We installed the Aulnox system on our Turbo and it's very very nicely made and will probably never wear out. The welds are beautiful and the fit was pretty good. Took some fettling to get onto the engine because we did it "engine in car". Here's an interesting video of unlocking power with better exhaust; https://www.enginelabs.com/engine-tech/dyno-testing/baby-got-back-turbo-exhaust-size-comparison-test/ You will not regret this purchase. Jon Appprciate the post Jon, all the best! Ben Quote Link to post Share on other sites
naasaa 32 Posted April 27, 2020 Report Share Posted April 27, 2020 On 23/04/2020 at 18:22, jcslocum said: We installed the Aulnox system on our Turbo and it's very very nicely made and will probably never wear out. The welds are beautiful and the fit was pretty good. Took some fettling to get onto the engine because we did it "engine in car". Here's an interesting video of unlocking power with better exhaust; https://www.enginelabs.com/engine-tech/dyno-testing/baby-got-back-turbo-exhaust-size-comparison-test/ You will not regret this purchase. Jon Hi Jon May I ask why you made the change to the Alunox system. I guess it is with 2.5" rear system? Did you install this on a standard engine configuration? Did this exhaust system change the engine drivability; do you experience any performance gain? Thanks, Lars Quote Link to post Share on other sites
Barrykearley 6,973 Posted April 27, 2020 Report Share Posted April 27, 2020 Simply by changing the exhaust manifold you will notice a distinct difference in response and turbo spool. Believe others have proved a 15-20bhp gain as well. 1 Quote Only here once Link to post Share on other sites
ALUNOX 38 Posted April 28, 2020 Author Report Share Posted April 28, 2020 Few photos to whet people's appetites! I hope to start boxing up the first few orders tomorrow. There's only a few days left so anyone that wants to take advantage of the discounts please let me know ASAP. Ben 1 Quote Link to post Share on other sites
naasaa 32 Posted April 28, 2020 Report Share Posted April 28, 2020 On 27/04/2020 at 14:08, Barrykearley said: Simply by changing the exhaust manifold you will notice a distinct difference in response and turbo spool. Believe others have proved a 15-20bhp gain as well. Response was actually one of my Concerns, but rather thy the boost would come in earlier due to larger diameter primaries. But do reads your reply as a quicker spool up time? Quote Link to post Share on other sites
Barrykearley 6,973 Posted April 28, 2020 Report Share Posted April 28, 2020 Turbo will spool up earlier in the rpm range - and it feel a lot more responsive because of this as it delivers through the rpm range Quote Only here once Link to post Share on other sites
naasaa 32 Posted April 28, 2020 Report Share Posted April 28, 2020 2 hours ago, Barrykearley said: Turbo will spool up earlier in the rpm range - and it feel a lot more responsive because of this as it delivers through the rpm range Sorry for my previous cryptic reply! What is was trying to say is, that a smaller diameter runner should result in better response, earlier spool up. Rather than a manifold with larger diameter. But if the general experience with this setup is vise versa; thats just great. Quote Link to post Share on other sites
Barrykearley 6,973 Posted April 28, 2020 Report Share Posted April 28, 2020 Here’s what a really old one looks like - only been on the car 2 years though Quote Only here once Link to post Share on other sites
Jacques 959 Posted April 28, 2020 Report Share Posted April 28, 2020 Hej Lars, Nej, en større afgang på en turbo motor kan give mere effekt. Det sker bl.a. ved at den forbrændte gas kan komme hurtigere væk fra topstykket. I modsætning til en sugemotor, som er mere afhængig af et vist modtryk. Der er lige lavet en video på flutube om en amerikaner v8 som er tunet, turbo o.s.v. Og den får større og større afgang - mere og mere effekt. Jeg har selv en alunox bananmanifod på min SE, og den giver tidligere og bedre (hurtigere) spool up, mere effekt og mere bundtræk. Når det så er sagt, passer den bedst sammen med nogle andre modifikationer, så som turbo, større indsugning, chip o.s.v. hvis man ønsker dette. Sådan som jeg har forstået det, skulle denne nyeste model være en lille smule bedre endnu. Men jeg har ikke set nogen sammenlignelige data endnu. Det holder folk tæt ind til kroppen. Hi Lars, I've got one of those alunox tubular exhaust manifolds, and it's different on a turbo engine compared to a n/a engine. I just saw a video on flutube on a turbo tuned american v8, and it developed more and more hp, with a bigger and bigger exhaust system, going from 3-3,5-4" and then finally a short really fat tube (race only). It developed seriously many hp for each increase. I realise that there are other factors, and the alunox exhaust manifold work better with some other points of interest, such as bigger turbo, chip, injectors, porting etc. It's a sumarize of many small things than make greater result. Just my two P. Jacques Quote Nobody does it better - than Lotus Link to post Share on other sites
naasaa 32 Posted April 29, 2020 Report Share Posted April 29, 2020 Hi Jacques & Barry I do recon the Alunox exhaust as a master piece. And not just looking good. My 84 engine has forged pistons, CAC, efi and a new GTX3071R turbo. Further the gearbox has been on a tour via Harry Martens. I havent runned this setup witn the cast iron manifold, but do not think that this is a bad manifold. But kind of figure that the existing exhaust is a limiting factor. At least the rear part. Here I want to go for a 3". I saw the video of that V8 turbo testing exhaust dimensions, but believe that this test was more in a quest for most output. Though I did notice that the torque were also elevated. Naturally I am going for more output as well, but wont trade in for low end torque and drivability. So glad to hear that your do not experience this with the alunox setup. Can be due to better tuned equal length runners 4-2, less sharp bends and smoother inner surface. Thanks for your input. Lars Quote Link to post Share on other sites
jbouw 1 Posted April 29, 2020 Report Share Posted April 29, 2020 Hi Ben, If it's not too late, could you sign me up for a Stevens manifold? Many thanks, Jesse Quote Link to post Share on other sites
ALUNOX 38 Posted April 29, 2020 Author Report Share Posted April 29, 2020 Hi Jesse, You're just in time! Please send me a private message with your email address please and we can go from there! All the best, Ben 1 Quote Link to post Share on other sites
tkathulevej 1 Posted April 29, 2020 Report Share Posted April 29, 2020 Hi, Are there pictures of the G-car N/A manifolds. There are two very different designs whether it's S2 or S3 cars ...Those manifolds pictured until now looks to fit S3 only /tka Quote Link to post Share on other sites
jcslocum 97 Posted April 29, 2020 Report Share Posted April 29, 2020 (edited) On 27/04/2020 at 04:22, naasaa said: Hi Jon May I ask why you made the change to the Alunox system. I guess it is with 2.5" rear system? Did you install this on a standard engine configuration? Did this exhaust system change the engine drivability; do you experience any performance gain? Thanks, Lars Lars, We had the old cast iron unit that was off when I bought the car with the engine in pieces. Knowing that turbos react well to advanced exhaust systems, I knew this would be an excellent upgrade, as well as to not have to worry about the cast unit cracking. The better flow from the headers of equal length makes the turbo more responsive and spool up faster and with more immediate effect, as has been written by others. We just bought the header and my daughter fabricated the rest of the system in 3" for max flow. The engine in my car is very responsive with to me, zero lag. I do think it has added power and less heat in the engine bay as an added benefit. Edited April 29, 2020 by jcslocum Quote Jon - 1984 Esprit Turbo Link to post Share on other sites
naasaa 32 Posted April 29, 2020 Report Share Posted April 29, 2020 53 minutes ago, jcslocum said: Hi Jon Thanks for your comment. Seen the work you and your daughter have done. Looks really nice. Think that I will be going for a full 3" Alunox system. Lars Quote Link to post Share on other sites
naasaa 32 Posted May 4, 2020 Report Share Posted May 4, 2020 On 29/04/2020 at 17:56, jcslocum said: Lars, We had the old cast iron unit that was off when I bought the car with the engine in pieces. Knowing that turbos react well to advanced exhaust systems, I knew this would be an excellent upgrade, as well as to not have to worry about the cast unit cracking. The better flow from the headers of equal length makes the turbo more responsive and spool up faster and with more immediate effect, as has been written by others. We just bought the header and my daughter fabricated the rest of the system in 3" for max flow. The engine in my car is very responsive with to me, zero lag. I do think it has added power and less heat in the engine bay as an added benefit. Hi Jon Which kind of silencer did you use? Lars Quote Link to post Share on other sites
jcslocum 97 Posted May 5, 2020 Report Share Posted May 5, 2020 I will have to look it up. Quote Jon - 1984 Esprit Turbo Link to post Share on other sites
ALUNOX 38 Posted May 20, 2020 Author Report Share Posted May 20, 2020 Good Morning Everyone, We have updated people where possible by email but in the nature of transparency I thought an update was in order. We are struggling to send all the completed orders. We have a lot of supply chain issues currently affecting both us and the rest of the world. This is entirely out of our control, orders that were placed weeks and weeks ago still have not been received (boxes, packaging materials etc). I realise this must be frustrating for people that have already paid but we have all worked very hard to get the orders finished despite the current global crisis we are all facing. The last thing we want is goods to be damaged in transit, given the massive backlog and issues surrounding logistics companies at the moment it's even more important that items are securely packaged. We have sent half of the orders placed with the materials we already had on site, the rest will leave as soon as the items we require have arrived. These have been re-sent by our supplier but I fear that has only helped overload an already overloaded infrastructure. Please rest assured we are doing what we can! Stay safe, Ben 1 1 Quote Link to post Share on other sites
Big Vern 103 Posted May 24, 2020 Report Share Posted May 24, 2020 Thanks for keeping us updated Ben Quote Link to post Share on other sites
ALUNOX 38 Posted May 28, 2020 Author Report Share Posted May 28, 2020 Right! FINALLY in a position to get the remaining orders boxed up for shipping. I cannot apologise enough for the delays, but as previously stated it's been out of our hands. Those still waiting please keep an eye on your emails for shipping invoices. Cheers, Ben 1 Quote Link to post Share on other sites
Senior 45 Posted May 28, 2020 Report Share Posted May 28, 2020 Got mine thank you. Still boxed so can't comment on it. Quote Link to post Share on other sites
ALUNOX 38 Posted June 2, 2020 Author Report Share Posted June 2, 2020 Good Morning, I just thought it was worth also mentioning that when you fit these you will have to jiggle them about a bit. Because of the slip joints the primaries do move about as you are trying to fit, it may seem the flanges are not aligning properly... This is not the case. You may need to flex/twist the odd primary a bit to allow it to go over the studs but this is fine. Locate them one at a time with a couple of nuts to hold in place when all on, pull up level and in sequence. Do not disassemble the slip joints to do this. Once the first heat cycle has gone through the system things will relax into position, It can then be re torqued and checked. This is a tight and fiddly job to do so be prepared to take your time. Always check your stud length and fitting kits first as the flanges are thinner than the original cast. Just to reiterate, DO NOT separate the slip joints from the collectors, it's fine to take the tabs off and let them move left to right, but please don't be tempted to take them out of the collectors. Many thanks! Collector.pdf 1 1 Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.