Exhaust Recommendation

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Malleus said:
How are you connecting the scanner to the ECM?
Click to expand...
I am using the diagnostic port under the hood.
Speedytech7 said:
MT2500 is an old Snap-On OBDI scanner, he might have the Toyota plug and chip (they used little game cartridge looking things containing the definitions for the manufacturer) for it actually, which is fairly rare. You can also measure and graph the O2 voltage response from the Diag port in the engine bay as well.
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Just as an FYI the Snap On MT2500 works on OBD2 cars and trucks too. Snap ON supported the MT2500 up till the 2008 model year with software updates that could be reprogrammed on the tool truck on a new style RAM cartridge that Snap On offered in the early 2000's.

With that new RAM cartridge you could update all the different manufacturers info for the upcoming year onto one cartridge without having to buy a different cartridge for each and every car manufacturer.
 
So you have a SnapOn connector for the DLC1?
 
Rifleman said:
I am using the diagnostic port under the hood.

Just as an FYI the Snap On MT2500 works on OBD2 cars and trucks too. Snap ON supported the MT2500 up till the 2008 model year with software updates that could be reprogrammed on the tool truck on a new style RAM cartridge that Snap On offered in the early 2000's.

With that new RAM cartridge you could update all the different manufacturers info for the upcoming year onto one cartridge without having to buy a different cartridge for each and every car manufacturer.
Click to expand...

Well that's pretty damn neat, if I didn't have an Autel I'd try to hunt one of those cartridges down for my MT2500. I don't have the Toyota DLC1 connector or cart for it, I just keep it around for old Ford and GM garbage that rolls through the shop. I still want an MT2400 DMM though, been trying to find a working one for a few years. I bought a TOYOBDI a few years ago for checking on the Toyotas. Honestly doesn't come in use much these days, most folks come to us to install standalones and get rid of the stock computers anyway.
 
LX450 with super charger, CX Racing headers and 3" custom over the frame exhaust. J-pipe to reduce the drone at 2800rpm/75mph. 4.88 gears and 35" tires.
doc_random

Build Post in thread 'Doc Random LX450 Re-Build Thread'

I had put headers on my '78 FJ40 over 25 years ago and had always lusted after them for the 80 series. Found them on line and ordered them. Did not realize they cut off the feed for the EGR, but found a way around that. Scottsdale Muffler in AZ is the bomb for custom exhaust work. Chris and crew are awesome. They got the exhaust over the frame behind the cats. I had 4 repairs on this section due to it hanging below the frame before. Greg's Japanese in Chandler helped me delete the rear heater and some I do not have to worry about melting the heater hoes above the frame where the...
Sound clip with spectrograph:
doc_random

Build Post in thread 'Doc Random LX450 Re-Build Thread'

This is so-so sound quality and worse video! I was recording the frequency spectrum vs speed by taking a video of a tablet running two apps. The site won't let me post here. Hopefully this link to YouTube works. The J-pipe length was tuned to eliminate the drone at 75MPH/2800rpm, and you can see the peak dB at around 120Hz roll off at 75MPH. This is about 45 seconds into the clip. I was driving one handed while recording and got too nervous to push it faster.
Ulysse Speedometer app (on the left) lets you do 1/4 mile, 0-60, and 0-100 timings and speedometer using GPS. Physics...
  • Like
The shop had to cut and re-weld cylinder #2 pie to clear the supercharger body.
The J-pipe is the 2" dead end section that points to the driver's side. Muffler ahead of the rear axle and two resonator's behind.
1766527878079.webp
1766528109532.webp
 
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doc_random said:
LX450 with super charger, CX Racing headers and 3" custom over the frame exhaust. J-pipe to reduce the drone at 2700rpm/75mph. 4.88 gears and 35" tires.
doc_random

Build Post in thread 'Doc Random LX450 Re-Build Thread'

I had put headers on my '78 FJ40 over 25 years ago and had always lusted after them for the 80 series. Found them on line and ordered them. Did not realize they cut off the feed for the EGR, but found a way around that. Scottsdale Muffler in AZ is the bomb for custom exhaust work. Chris and crew are awesome. They got the exhaust over the frame behind the cats. I had 4 repairs on this section due to it hanging below the frame before. Greg's Japanese in Chandler helped me delete the rear heater and some I do not have to worry about melting the heater hoes above the frame where the...
Sound clip with spectrograph:
doc_random

Build Post in thread 'Doc Random LX450 Re-Build Thread'

This is so-so sound quality and worse video! I was recording the frequency spectrum vs speed by taking a video of a tablet running two apps. The site won't let me post here. Hopefully this link to YouTube works. The J-pipe length was tuned to eliminate the drone at 75MPH/2800rpm, and you can see the peak dB at around 120Hz roll off at 75MPH. This is about 45 seconds into the clip. I was driving one handed while recording and got too nervous to push it faster.
Ulysse Speedometer app (on the left) lets you do 1/4 mile, 0-60, and 0-100 timings and speedometer using GPS. Physics...
  • Like
The shop had to cut and re-weld cylinder #2 pie to clear the supercharger body.
The J-pipe is the 2" dead end section that points to the driver's side. Muffler ahead of the rear axle and two resonator's behind.
View attachment 4054044View attachment 4054046
Click to expand...

Small world I also had my exhaust reworked at Scottsdale muffler on my 80 back in the day. Any idea what the length and diameter of your helmholtz resonator is (j-pipe thing)?
 
Speedytech7 said:
Small world I also had my exhaust reworked at Scottsdale muffler on my 80 back in the day. Any idea what the length and diameter of your helmholtz resonator is (j-pipe thing)?
Click to expand...
**These headers block the EGR port at the block**
This is the schematic with some part numbers as a starting point. Diameter of the J-pipe is 2".
The table at the lower left are my estimates for the length of the J-pipe, which was 24" to 27". The clamp allows for some adjustment, but they set it at 25.5" and it is sweet! They asked me to come back and have it welded once I was happy with the sound, but it has been 9 years and I never went back.
The formula is based on the air temperature inside the dead end tube as this determines the speed of sound for the reflected 1/4 wave.
1766529441400.webp
 
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mudgudgeon said:
Crushed as flat as a pancake at the rear diff!
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This is my 3" at the rear diff. Lost a little cross section area due to the bends, but still pretty good.
1766534619900.webp
 
Malleus said:
So you have a SnapOn connector for the DLC1?
Click to expand...
To answer your question, yes, my scanner came with a connector that plugs right into the DLC. No need for paper clips or jumpers to read my trucks trouble codes.
 
mudgudgeon said:
Looks well made.

Can't help but see this straight shot to the bottom of the exhaust manifolds

View attachment 4054791

If you don't want/ need cats, this is way nicer path than up/down/looped around the frame path toyota
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He’s got a weird muffler upstream that dumps it into the passenger fender well…

IMG_7687.webp


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reklund5 said:
Find a competent local hot rod fabricator or exhaust shop and have them do a custom setup.

I've installed a "Brexhaust" setup (Magnaflow) for a friend, and it failed within 6 months. They have warranted it, which is great...but now I gotta do the work again. It was a direct bolt-in setup, and was pretty cheap...

I'm putting a turbo on my truck next week, and the exhaust from the downpipe back will be custom fabricated stainless steel, with v-band clamps and nice hangers to make it easy to service.
Click to expand...
I puchased the Magnaflow header+cat and the second cat and had an independent shop put them on 8 years ago and they are still going strong. So, YMMV.
 
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