Well progress has been very, very little. Student budgets suck... But I have done a few things.
A month ago I put some LED lighting in. After a year and a half, it's nice to see what the hell I'm looking for in the car at night.
They are switched on the switch panel instead of by the doors which I actually prefer. Found them at Autozone in their "pimp my ride" section but they word great. Between the three of them they are way brighter than any interior lights I have seen and consume half the energy of one regular bulb. Pretty awesome as far as I'm concerned!
Today, I decided to have a crack at building my own "axle back" from scratch. My dad had some left over bends, straights, an 18 wheeler exhaust stack from building a totally custom exhaust from the Lotus Elite track car he is building that he said I could have.
Goals were to have a lighter (barely accomplished), free flowing muffler with a turn down tip.
Here's what I started with.
A rough idea of the end product.
Drilled a million pilot holes in the inlet side.
Laid out again for sizing of tip and and bend.
Bored out pilot holes. Am I making a machine gun heat shield?
Not seen I added an insert in the center to block direct flow forcing the exhaust through the holes and into the chamber.
Welded on the end plates.
Slid center section in and finished other side.
Between then and here, I ground smooth the casing welds and then upon test fitting realized I screwed up and didn't account for the angle which the exhaust come up next to the diff and just matched the turn down and inlet bend. So I cut off the turn down, rotated marked and welded the turn down back on. Here you can see it welded to the axle back section of pipe.
Finally bolted it up and realized it was too long and hitting the frame and the turn down angle is still off...
Tomorrow, I'm gonna take it off again, shorten the straight bit between the bend and housing on the inlet side which will give it plenty clearance and also get the rotation of the turn down on the money. Also still need to make the hangars and paint.
I think it turned out pretty good though!
End impressions:
It has a great tone to it and is not to loud. Problem is it turned out too free flowing so it pushed the power band out of the usable range with the 6,500 rev limit. I might open it up and try adding a baffle somewhere to get some back pressure back but if it were turbo it would be perfect.
Will I do this again any time soon? Probably not unless it needs to be totally custom. It took almost a whole day between drilling what seemed to be an endless amount of holes, guessing on measurements, welding, redoing sections due to guessed measurements, etc. But considering the materials were free, and the alternative was pulling up tile in the bathroom it was fun and I'm happy enough to leave it on the car. But in hind sight, it would be way more worth it to just spend 50 bucks and buy a muffler and cut out 90% of the fab work.