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High flow exhaust

Discussion in 'Performance' started by MiniBrutes, May 14, 2008.

  1. MiniBrutes

    MiniBrutes Member

    Anyone open up their exhaust? I am curious if it would help (More flow) or hinder (less backpressure)?

    This is assuming we dont care about fuel economy, but are looking for more power.

    We had one with a bad muffler that we installed a high flow unit in. It sounded great, but didnt have the chance to really test it before it sold.
     
  2. larryn2o

    larryn2o Member

    i've run a 2 inch pipe and a turbo muffler on my Midget. sounds good .not sure if it helped the power. but it sounds good. don't put a glasspack on a 3 cylinder motor . it sounds like a kazoo.
     
  3. MiniBrutes

    MiniBrutes Member

    You have a midget! Thats awesome. We got a few years yet in before we can import them to Canada.

    When did they start? 95?
     
  4. larryn2o

    larryn2o Member

    96 was the first year . the locar dealer has sold 3 so far and has another on hand.
     
  5. Don-in-Japan

    Don-in-Japan Member

    Mine has a Summit bought glasspack and 2 inch stainless exhaust. Sounds more like a hopped up 4 wheeler than a kazoo. I really needs to complete my headers, and add a carb to see any benifits.
     
  6. larryn2o

    larryn2o Member

    the glasspac that i run is about 12 inchs long. it's on a 1.0 suzuki motor . very loud & when you let off the gas it has a sound like "COPS SUK"

    a larger carb should be easy . make an adapter or cut the intake out for a larger carb.
    the header is something i'd like to come up with.
     
  7. Don-in-Japan

    Don-in-Japan Member

    The carbs I want to run require a new manifold. 750cc Suzuki motorcycle carbs.

    One day I'll get off my fat backside and do it.
     
  8. Mighty Milt

    Mighty Milt Active Member

    less restriction with a free flowing muffler and short tail pipe will help top end, but bog you down off the line. if you run a longer tail pipe after the muffler it will help maintain your torque.
     
  9. oldsnowman

    oldsnowman Member

    what size of tail after the muffler did you use?
     
  10. Mighty Milt

    Mighty Milt Active Member

    i ran a 2" pipe from the back of the cat to a 2" "turbo" muffler (hi flow but not straight through) than 2" forward to the "smoke stack" right behind the bed which is 3" up and out. it sounds GOOD!! :D

    [​IMG]

    [​IMG]

    [​IMG]
     
  11. Eljordano

    Eljordano New Member

    Stack

    Dude, that stack is sooo bitchin'.. I wanted to do that on my toyota diesel project, but then my sister rolled the truck.. sheesh. Anyone want to buy a 2.4 Toyota diesel engine and 4x4 tranny!

    Anyways, lovin' the mods on the mini truck exhaust, a turbo muffler eh! Any suggestions for a supercharged Sambar, I'm also hunting for an equation to improve the intake scenario..
     
  12. Damien Rorick

    Damien Rorick New Member

    i would be careful on these jap motors ther is a chance u could float a valve it is better to have a some back pressure it improves low end tq
     
  13. Mighty Milt

    Mighty Milt Active Member

    back pressure is good for torque, i'll agree with that, but i have yet to see how back pressure, or lack there of, will allow a valve to float. if you have valve springs with the proper seat pressure for the lift, that are in good working order ie. not fatigued from over revving, the amount of pressure in the cylinder will have NO affect on it.

    when i was drag racing, i ran mufflers and straight pipes on the same exact motor, no difference either way. a little better top end with less restriction but a loss on my 60ft time due to lack of torque. and vise versa when running a muffler. but the final times through the trap were a wash... too close to call.

    in my set up, i have a proper muffler so there is back pressure. i also have at least 6ft of tail pipe which is very helpful in maintaining back pressure and torque.

    cheers
    milt
     
  14. gilalwin

    gilalwin New Member

    I have a 91 Sub Sambar. Any problems removing the existing muffler and installing a regular muffler? I am concerned about the hot air hoses from the muffler area into the air intake. Is that a concern?
     
  15. Timetripper

    Timetripper Moderator

    Actually those are needed for winter to keep carb from icing
     
  16. torpedoman

    torpedoman New Member

    if you do free flow exhaust make sure you compensate by riching up the mixture i rebuilt a lot of bike enginge because people did'nt.
     
  17. Don-in-Japan

    Don-in-Japan Member

    It may be good to invest in a high quality air/fuel mixture meter. They are pretty cheap now-a-days.
     
  18. skywalker

    skywalker New Member

    i have 90 sambar van it needs muffler ... any one knows were i can get one

    thank you
     
  19. Badgerland

    Badgerland Member

    Milt - where did you get the stack from?
     
  20. Mighty Milt

    Mighty Milt Active Member

    Muffler Masters - Glendale, Arizona - 623 939 5773

    they've been doing all my exhaust work for about 3 or 4 years. great guys - great work & i always feel like i get a fair price.
     

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