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JNR 13B
Regular


Location:
Sydney
Registered:
June 2003
20v exhaust Sat, 21 May 2005 14:50 Go to next message
I'm just wondering what people use for 20v exhaust on a sprinter?
is 2.5inch is too big for an NA car?

I was plaining for Extractor then 2.5inch cat the one hotdog the a straight through exhaust. all 2.5inch pipe

is that too much air flow for and NA?
will that be loud at all?

that reason for the exhaust is because my car run like shit at the moment. my mate said it because of the shit exhaust on the car. plus it need a good tune.

to explan how the car drive is.
it run like a cabby set up.
it back fire in the last engine(piston) alot if the car is not fully warm up.

what is the max REV i can safely do on the 20v engine?

please let me know what i can do with this

thanks

[Updated on: Sat, 21 May 2005 14:55]

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Jonny2TG
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Location:
Tasmania
Registered:
May 2002
Re: 20v exhaust Sun, 22 May 2005 02:18 Go to previous messageGo to next message
For a road going car, 2" would normaly be loud enough. Many with the 4A-G go to 2.25", which would sometimes sound good, and other times sound like a bee in a box, depending on mufflers. I am guessing 2.5" is a little extream, and loud. And loud will not always sound good if you have the wrong mufflers (cannons). I am planning a 2.25" system with mine, with resonator and muffler. I have 2" on my 3T-G and that is plenty loud enough, and sounds good.

Exhaust will not really help your car fun better (unless it is currently really really small). If it backfires it is probably running too rich. Or you can get bad backfire sounds if you have no exhaust, or the exhaust is too big with no resonator.

Some people put a rev limit of 9000rpm on the 20 valve. The stock 20v tacho goes to 9. But the stock rev limit is probably at 8200rpm. Some say that if you continuely run any stock 4A-G to 8500rpm you will do a big end or put a rod out the side. So if you want your engine to go a long time don't go over 8000rpm. If you know the tune is wrong, don't go over 6000rpm. If the tune is wrong, it will be very hard to get past 7500rpm anyway.
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JNR 13B
Regular


Location:
Sydney
Registered:
June 2003
Re: 20v exhaust Sun, 22 May 2005 08:16 Go to previous messageGo to next message
thank for the reply

I also think that i have a leak on the exhaust aswell.
I'm runing qrad throtle with after market ecu.

what would be the cause of back fire on the last throtle closest to the fire wall?

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towe_001
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Location:
Somewhere on a dirt bowl ...
Registered:
August 2004
Re: 20v exhaust Sun, 22 May 2005 10:26 Go to previous messageGo to next message
It could possibly be an air leak between the exhaust manifold and the head or like jonny said too much fuel (like a leaking injector).
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Sam_Q
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Location:
S.E suberbs, Vic
Registered:
December 2003
 
Re: 20v exhaust Sun, 22 May 2005 12:51 Go to previous messageGo to next message
we had a pretty good thread while back when it came to a 4age setup, try finding that with a search, should help you.
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Jonny2TG
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Location:
Tasmania
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May 2002
Re: 20v exhaust Sun, 22 May 2005 14:36 Go to previous messageGo to next message
if it backfires back out through the inlet manifold, you have a air leak at the inlet manifold on that cylinder.

My sidedraft carbies used to do this, throwing a ball of flames out the trumpet.
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Johnny
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Location:
Sydney, OZ
Registered:
May 2002
 
Re: 20v exhaust Mon, 23 May 2005 09:55 Go to previous messageGo to next message
Just a little info, standard 20V exhaust system is around 2"-2.25", I haven't measured the one sitting in the workshop, but sitting next to a standard AE102, it's definately a big sucker!
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trevtrev
Regular


Location:
Brisbane
Registered:
October 2004
Re: 20v exhaust Wed, 25 May 2005 07:03 Go to previous messageGo to next message
Anyone know what the standard exhaust pipe size is on the AE90 (6AFC)?
Now that I have the 20 Valve in, i was going to put a 2 or 2.25 in but just wanted to know what I have in there atm...
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JNR 13B
Regular


Location:
Sydney
Registered:
June 2003
Re: 20v exhaust Wed, 25 May 2005 12:29 Go to previous messageGo to next message
if it backfires back out through the inlet manifold, you have a air leak at the inlet manifold on that cylinder.

My sidedraft carbies used to do this, throwing a ball of flames out the trumpet.


where is the inlet manifold?
as far as i know the quad is my inlet mainfold.

there is not fire when I said it back fire. but it blow our a high presure air.

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OUTRUN
Regular


Location:
Parra
Registered:
January 2005
Re: 20v exhaust Wed, 25 May 2005 13:22 Go to previous messageGo to next message
does the exhaust actually matter? im going for 2 1/4 on my 4age and my mate said the larger the better , and saying like you cant get TOO big etc etc

but the right size exhaust for that engine , i .e a 1.6L shouldnt be to large yeh?
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Acoustic
Regular


Location:
Hong Kong
Registered:
November 2003
Re: 20v exhaust Thu, 26 May 2005 02:29 Go to previous message
Hi guys

I offer my mods for discussion.

http://www.my-acoustic.com/Car/intake_exhaust/cust om_extractor/custom_extractor.htm

http://www.my-acoustic.com/Car/intake_exhaust/muff lers/mufflers.htm

I think it should not be more than 2 inches because of observation of: -

1) jet fighter - they are fastest when the last section / exhaust flare closes / become smaller

Right?

2) Ferrari, Lamborghini, and those 450bhp sports car class normally have twin pipes and each are no bigger than 2 inches.

I never measured them before but watching from videos, it's around 2 inches and no more than 2.5 inches for sure.

Regardless of V8, V10, V12 versus / compared to our 4_in_line / versus turbos and what lot .... BHP = BHP = total flow and is a 450bhp to massive 600bhp+ can sustain using twin 2 inches pipes then single 2 inches pipe would be more than enough for us.

Current WRX, EVO comes stock 280bhp single 2 inch pipe. In fact my friend's WRX 5 years old, runs 1.7 inches stock. All he does is remove the CAT. I know I know it's not environmental friendly. Well he removed 2 out of 3 and retain the last one only.

On dyno he recovered around 30 bhp be removing the front 2 cats.


My current setup runs bad at low rev / low throttle when I swap in the MATOLA straight flow.

I kinda regret using such big pipes Sad
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