Topic: 20r exhaust help

[toyodaaddict]

i need help choosing a new muffler and pipe for my stock 20R. i have always used flowmasters and 2.25" pipe on 22R/RE's but i dont know if this is the best set up for a 20R,im thinking maybe smaller pipe or just going all stock. what do you all think?  i know this has been descused but i did search and couldnt find anything about the 20R

[David]

My thoughts would be: since both the 20r and 22r are nearly the same engine, the bigger exhaust would be what you want. To a point, the bigger exhaust is preferred over the smaller more restricted one. An after market header would also help the engine breath better.
And depending on the year engine, the 20R makes a bit more power than the 22R.
I have 2.25" pipe, flowmaster and no cat on my '83 22R, and am pretty happy with it.

[toyodaaddict [OP]]

My thoughts would be: since both the 20r and 22r are nearly the same engine, the bigger exhaust would be what you want. To a point, the bigger exhaust is preferred over the smaller more restricted one. An after market header would also help the engine breath better.
And depending on the year engine, the 20R makes a bit more power than the 22R.
I have 2.25" pipe, flowmaster and no cat on my '83 22R, and am pretty happy with it.

i have the same 2.25" and flowmaster on my 22r and like it aswell. i cant aford to put an aftermarket header on this 20R i just need a new muffler and tail pipe for now

[Quick Draw]

My thoughts would be: since both the 20r and 22r are nearly the same engine, the bigger exhaust would be what you want. To a point, the bigger exhaust is preferred over the smaller more restricted one. An after market header would also help the engine breath better.
And depending on the year engine, the 20R makes a bit more power than the 22R.
I have 2.25" pipe, flowmaster and no cat on my '83 22R, and am pretty happy with it.

Technically the 20R is not at all more powerful than the 22R.  The 22R makes more horsepower and torque.  Although I have heard many people give a seat of the pants estimate that the 20R is more torquey.  This probably has to with the 20R hitting peak torque around 2400 RPM as opposed to 3400 RPM on the 22R (according to Wikipedia).  That said, if you would like to retain the torquey feel of the engine, stay with smaller tubing.  Opening it up too far just may switch your torque curve to high RPM, which isn't ideal for crawling.  Although, I will say that I have either 2" or 2.25" (I will check later) tubing and some $40 muffler on my 20R and it gets around pretty good.

[toyodaaddict [OP]]

Technically the 20R is not at all more powerful than the 22R.  The 22R makes more horsepower and torque.  Although I have heard many people give a seat of the pants estimate that the 20R is more torquey.  This probably has to with the 20R hitting peak torque around 2400 RPM as opposed to 3400 RPM on the 22R (according to Wikipedia).  That said, if you would like to retain the torquey feel of the engine, stay with smaller tubing.  Opening it up too far just may switch your torque curve to high RPM, which isn't ideal for crawling.  Although, I will say that I have either 2" or 2.25" (I will check later) tubing and some $40 muffler on my 20R and it gets around pretty good.

mines 1 1/2" pipe probobly stock,and a stock muffler with so many holes its stupid

[David]

Of course I could be wrong,it's happened before.
But this I do know for certain, when I changed from the stock pipe, muffler and cat to the larger pipe, flowmaster and no cat, the truck would scoot along much better.

[79coyotefrg]

the best size tube for the 20R is 2 inch or 2 1/4 inch, it doesnt care which one it has.  The 22R has more displacement and concerning bone stock engines the 22R is a more powerful motor. BUT the 20R with a header and a 22R carb or weber will out perform a 22R.  if you have a need for some serious power put  a 20R head on the 22R block

ive had all three

[David]

"if you have a need for some serious power put  a 20R head on the 22R block"
What problems or mods need to addressed to make that swap?

[toyodaaddict [OP]]

2" pipe and a flowmaster it shall be. not that ill be doing it anytime soon but yes what probloms does one run into puting together a 22/20 ? i know its not just toss on the 20r head and run

[Plekto]

Aftermarket Doug Thorley header and 2.25 inch exhaust.  The header and staying at no more than 2.25 inches huge.  2.5 is way way too big in fact, and 2.0 would probably be better, but the common tubing and mufflers and such are almost all 2.25 which works fine.

Mine went from 4th gear up the hill to the town where I live(about a 5 percent grade for 4-5 miles) and maybe 50mph while doing it to 70mph in 5th.  I have to flog the little thing but I can actually keep up with normal traffic.   The header is the real key here.  But they are expensive, so only do this if the original manifold is busted or you're doing a rebuild.  Or if you can find a new old stock one lying around like I did(still cost me roughly $300 for the part, but that's better than the $480 they go for new)