Where did you purchase the Lotus Type 131 CF door sills from?
📓 Journals Adding Lightness
- Thread starter Eagle7
- Start date
This prefix is only usable in the Lotus Emira Journals forum.
Wow! That's impressive.
Not really.
I made a few bits to complete the CF look by getting rid of the anodised alloy, piano black, and yellow stuff that I didn't like.
Attachments
Nice work!
If anyones interested, the journey is laid out here:
https://www.emiraforum.com/threads/my-dv-emira-and-modifications.3798/
https://www.emiraforum.com/threads/my-dv-emira-and-modifications.3798/
- Thread starter
- #467
I sent the drawing to @Aerie and I'm waiting for Jason to respond. Hopefully he's still there. I don't know that he's on this forum all that much anymore. Hopefully he'll respond soon. If he doesn't, I might share the drawing on here. It'll absolutely work, I just don't know about the muffler section.
Talk about true dual. More like dual true heroes! Can’t wait to see how these turn out
Hi @Eagle7 it is from the UAE.. so tariffs are none or maybe 10% from here cant remember
- Thread starter
- #474
Well I sent the drawing to @Aerie, but Jason sent back pictures of the stock setup and said it couldn't be done. I sent more info for him on what to do to make it work, but he hasn't responded in a week, so I'm going to post my drawing in here. This is a system that would use the factory exhaust manifolds as-is. It replaces the y-pipe and everything on back. If you wanted to use shorty headers (I was thinking the ones Aerie makes or @GRP), this same setup would work, you just have to replace the red-colored pipe sections with 200 cell sport cats that would need to be welded up to pipes matching those in the drawing so they would connect right up. You would only need one configuration; it would work for either side, just flip it for left or right.
The key to making this work is to remove the factory mounting bracket that the y-pipe connects to, as it's blocking the access through the frame opening (as shown below with the red arrows). That will leave enough room for the cross over section to fit. That was the area that Jason showed which he thought wouldn't work, but if you remove and replace that factory bracket, there's enough room.
A new bracket needs to be made that would bolt onto the same spot the factory bracket does (where the left red arrow is pointing to above), and that would be how you secure the cross over section.
I just drew two images on the drawing to indicate where mufflers would go, but a different arrangement could be fabricated if you wanted to have a valved bypass. A dual connector cable would need to be made that connects two bypass valves to the one factory connector, so the drive modes (Tour, Sport, Track) would work the same as stock. The whole thing would still just connect to the two red pipe sections, or sports cats, depending on the setup. What's nice about this system is you could just get the dual exhaust and mufflers, then later add the shorty headers and cats if you wanted to. Everything is designed to be modular in that regard.
Obviously this could be done in either stainless steel (less expensive), or titanium (more expensive) for weight reduction. I didn't draw it, but I was thinking if the mufflers were flat cans, they could be tilted up at an angle, so the entrance is at the lower end, and the exit is higher which would make it easier to pair up the exhaust pipes to fit in the factory exhaust tips. This would also aid in airflow up and through the muffler section to help manage heat output.
With a true dual exhaust system with cross over, even with the factory exhaust manifolds, it should unlock about 10-15 hp and sound a LOT better. It would add more torque too. With shorty headers (even with sports cats added), it would unlock somewhere around 20-30 hp, but might require a JB4 tune or custom ECU tune. You'd have to test it on a stock car with the factory ECU to see if it works without a CEL or error message. The cats would be required to run on the street, but for race only you could leave them off, but that would definitely require a tune.
Great work! Looks very good.. indeed the x pipe area was the only bottle neck and we also have designed this in exact the same place where it should be. For the rear part we have looked ar various options like valves/none valved.
- Thread starter
- #477
I can't remember where (it might have been Aerie or Valvetronic), but there was a post that showed the full headers with y-pipe and titanium exhaust delivered 21 hp on a dyno. The y-pipe is the problem. It's forcing 6 cylinders to output into a single pipe, which creates a lot of back-pressure. Even with the headers which helps, the y-pipe is still a bottleneck.
With a true dual and cross over, there's only 3 outputs per side, with the crossover giving even more flexibility to balance the exhaust output pulses. With less back pressure, that enables a more complete evacuation of the exhaust from the piston chamber, which makes room for more fresh air and fuel when the intake valve opens, and a cleaner mix. This is where the extra power comes from. If they were able to achieve 21 hp with the y-pipe, a true dual and cross over is going to be even better, which is why I gave the range estimate of 20-30 hp.
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