in this ramble-tron special, we modify our standard turbo log headed into a fully divided twin scroll set up. Please let me know if you'd like to see more automotive fabrication content in the comments below. www.fahlersp.com
Sloppy Mechanics are you planning to do a dyno test comparing this to the standard undivided log? Would be great to see if it’s worth all the work. Anyway it’s cool and unique.
"I know Matt doesn't care, But... I kinda care, I like things to look nice, and sometimes we try to make him feel that way too." -Joey Fahler I will always appreciate when my friends have the patience and skill that I do not have to make something beautiful for me, even if i would never "treat myself"
The idea of twin scroll is to avoid the back pressure from a newly opened exhaust valve blowing back into an already open valve. It allows greater boost (= exhaust back pressure) without reverse flow. The arrangement you have used may well have worsened the issue. Generally you'd group cylinders 1 and 4 together in one scroll, 2 and 3 in the other. For a V8, it's hardly going to make any difference to put one bank in each scroll. Looks good though.
also even if the firing orders had been correct, the fact that they were made with unequl length primaries would have had the exhaust pulses arriving all over each other at each volute. Having the firing orders array + unequal length primaries means that this is just a divided flange on a non twin scroll manifold. This setup isnt going to run well. Its a poor single scroll manifold design that incorrectly feeds a twin scroll turbo.
New to this channel. My career is in heavy duty diesels but cars are a huge passion of mine and I love this kind of stuff. From a guy who’s done a lot of welding in my life this man has amazing talents, beautiful work.
FrontYard4X4 that’s cool. I work on heavy equipment in underground mining at one of the deepest mines in the world currently approaching 10,000 foot deep mark.
As someone who fabricated my own ls turbo manifold , I will be giving you a call to order my next one. 😁 Mine turned out real nice and has lasted 5 years now but what alot of work. Nice job on the twin scroll
Awesome work. Cool to show the fusion work as well. I have been working on learning more of fusion as I go. It's nice to see someone else's thought process. Funny how you and Matt are always downplaying your skill and knowledge. Modesty is a hard thing to find these days. Keep up the hard work. Your Prusa is too clean mine looks like it has been thru a war.
Nice work. I built one very similar for my gto. I didn’t divide it tho because I don’t have a twin scroll. And I taught myself too. I ceramic coated and wrapped mine recently. It looked too good to wrap it but I was cooking alternators so I had to contain the heat somehow.
Just subbed. Also just purchased one of your last china log manifolds and it should be arriving by the end of the week. Super excited to get rid of my crappy home built hotside for something stronger and more pleasing to the eyes.
I know this video is 2 years old already but roughly the same time I had an idea of making a sleeper exhaust so it looks like it is 1 exhaust but both exhaust manifolds are kept separate through out the whole exhaust system and having twin tail pipes
Twin scroll manifolds are about eeking out as much performance as possible from the turbo. This is refreshing to see for the LS world, its been too long coming IMO. Nice skills, can't wait to see the results. Is there any plans to offer the twin scroll to the public ? or was this a one off ?
Nice fab work. Curious how it will work out performance as the cylinders aren’t really split for a true twin scroll, but you may still see some benefits. Great use of the 3D printer. Work smart not hard! I havnt used a 3d printer yet. But would it not be easy to make your template slightly larger a then the pipe diameter for proper tracing? Another idea I just had was to make your template, use it to set your vice/jig in a chop saw and giver!
I did make the template slightly larger, but sometimes things still don't quite always work out as planned. It got me close enough, so overall I think it was worth the time.
Great stuff here!! Even if I'm not sure that the twin scroll thing has any theoretical benefit in this application, it's fun to watch you guys try it out! One question about CAD, could the program have just flattened that section into a plane for cutting out of paper instead of leaving it in 3D printing format? If so I need to see if I could manage some simple stuff on that program.
Hammerhaus Kennel yes, it’s definitely doable. I have not ever tried it with this program, but i have done it with ease in similar software. However, the biggest struggle is getting the printer to print it at the perfect scale
@fahler speed and performance, are you selling these to the public or was it a one time thing? I’d like to see how much one with a T4 flange would cost.
one time thing. This was an incredible amount of labor, I'm not sure small benefits would warrant the cost when compared to one of our "standard" headers
I would not call this twin scroll divided... the twin scroll part is to even out the exhaust pulses, and you need to run the exhaust divided into the flange. (cyl 1-3 and 2-4 for a 4cyl) this is more like divided banks... not sure how this evens out, and I am afraid that the exhaust will be restricted in that manifold.. but, hopefully we get some dyno papers proving me wrong!
Nice job Joey!! Have you and Matt done any testing on this? I was thinking this would allow a more accurate reading for trying closed loop with a 02 bung for passenger side. Just a thought
Thanks. We did not do much testing other than Butt Dyno. Matt thought it felt more punchy down low. You may be right on the 02 readings, but most sensors dont survive long under the high heat and pressure of pre-turbo exhaust in my experience.
That's dope but that far back cylinder port merge scares me and should have been bent more and the entry moved forward to smooth the flow imo cause of how tight it is back there and how abrupt the turn is
I am very impressed with the finished product. I don't want to sound stupid but the end port looked like it was choked down compared to the rest so my question is would that cause a problem with ether choking that cylinder or excessive heat at that point. I just wanted to know it that was a concern or not. I thought it was air in and air out as easy as could be for more power. But if you thought it out or it just doesn't matter with a turbo?
The other 3 cylinders should help push the exhaust in the correct direction, and the turbine will help pull to some extent as well. I've seen far worse make good power, so I don't think its anything to stress over.
@@FSP3 Good to know like I thought you guy know way more than I do. I was thinking that the turbo would help push the exhaust out and the twin scroll can use it way more efficiently, and it does look very cool. So I hope I didn't hurt any feeling with my question just wondering. I did want to say the finished product is killer nice job on filling there you can even tell. SO did you MIG or TIG the sides I didn't hear if you said?
Some bad ass dudes build bad ass stuff with no name tools. Just because it doesn’t say snap-on, matco, miller, Lincoln etc. doesn’t mean they cant produce quality.
How are we supposed to know what you have. I’ve seen guys think they are a mechanic because they have snap-on tools and I’ve seen welders think they are the best because they’ve bought the best welder. All these guys and gals we follow on RU-vid are already better then us. Them making content for us to learn from already makes them better then most. Even if the content is wrong we still learn from it.
@@brianbarsness9828 sorry I wasn't trying to be negative just kidding around. I have that HF one in my toolbox at home and thought it was hilarious it only has 2 decimal places. Just funny seeing at a business but the bottom line is that it gets the job done most of the time
We never got any official data. But matt did say he felt it spooled significantly faster than his old set up. I would like to think his butt is calibrated fairly well.
Exactly, Only really beneficial on a v8 if you’re running twin turbos and all 4 of the runners on each side are the same length and paired together at the collector based on firing order.
the template didnt fit right because your drawing was from two flat circles. drawing a plane between the two created a oval shaped pipe. couple different ways to draw it round, but it still ended up close enough. would be a bit more critical if it were thin wall
