Difference between USDM and JDM stock exhaust sizes, s13 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

driftkid316 · 09-12-2006, 11:14 PM

getting right of my huge n1 and gona run electric cutout for my sr. just wondering the difference between the sizes between us and jdm stock exhaust sizes. if US is smaller, which it probably is, will it create too much back pressure?

*ManoNegra* · 09-13-2006, 11:56 AM

1st - Learn proper grammar
2nd - what the hell does the exhaust has to do with 'electric cutout'?
3rd - The two US and JDM oem catbacks are probably the same but who cares since they both are restrictive to turbo motors.
Do you even understand what back pressure is and it's effect on na vs turbo motors?

driftkid316 · 09-13-2006, 01:08 PM

first off i did a typo, meant gettin Rid of huge n1. and yes i do understand the effects of back pressure on na and turbo motors. and the electric cutout has to do with the exhuast cause it goes on the exhaust system. obviously the stock catbacks are restrictive to turbo motors, what oem exhausts arent restrictive to their motors. the point of my question was if the JDM stock one was larger, would using the US one be too small, creating too much back pressure. I just want to run a quiet stock looking exhaust, and thats where the cutout comes in, so i can flip the switch and run open downpipe.

Neejay · 09-13-2006, 02:01 PM

Are you basically asking if you used a USDM cut-out, would that be too restrictive on JDM piping?

kensreliableb18b · 09-13-2006, 02:07 PM

running usdm exhaust with sr wont blow up your motor. so just put on your cutout.

spirit · 09-13-2006, 02:12 PM

I'm running a stock replacement on my sr20det, made by bosal. Made for the 240sx fits just fine on my sr20det. Car runs fine, only thing that might be an issue, turbo spool up... I get mad power jump at 3k rpm (bad enough to not spin tires at take off but as soon as I hit 3k rpm it breaks loose).

bleachcola · 09-13-2006, 02:13 PM

i think he wants to go back to a quiet stock exhaust while driving normally, but have the cutout option near the downpipe for when he is racing etc. that way the turbo wont have any back pressure which is best.

*ManoNegra* · 09-13-2006, 02:30 PM

So this is what you were referring to by 'electronic cutout'?
(electronic cutout = battery kill switch to most people)
Seen video of Japanese cars running them
work fine, no worries if driving normally
70mm so it's better for 3" catbacks.

Darkvillin · 09-13-2006, 09:13 PM

what's wrong with running an exhaust like the rsr? it looks stock, sounds really quiet, and when you get on the gas it isnt restrictive. i say look into it.

backroadtouge · 09-13-2006, 09:17 PM

get the jdm exhaust so you can say "my car farts jdm" ans do a cool pose. jus tmessing. but rly. get it so you can say that.

*NemeGuero* · 09-13-2006, 09:48 PM

A J and a US.

09-12-2006, 11:14 PM	#1
driftkid316 Zilvia Member Join Date: Apr 2005 Location: corona, ca Posts: 198 Trader Rating: (2) Feedback Score: 2 reviews	Difference between USDM and JDM stock exhaust sizes, s13 getting right of my huge n1 and gona run electric cutout for my sr. just wondering the difference between the sizes between us and jdm stock exhaust sizes. if US is smaller, which it probably is, will it create too much back pressure?

09-13-2006, 09:17 PM	#10
backroadtouge Zilvia Member Join Date: Sep 2006 Location: TEXAS Posts: 217 Trader Rating: (0) Feedback Score: 0 reviews	get the jdm exhaust so you can say "my car farts jdm" ans do a cool pose. jus tmessing. but rly. get it so you can say that. __________________ お金も腕も、何も無い・

09-13-2006, 09:48 PM	#11
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 40 Posts: 8,132 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	A J and a US. __________________

09-13-2006, 11:56 AM	#2
ManoNegra Guild of Skullduggerous Intent Join Date: Jan 2004 Location: Socal Posts: 7,841 Trader Rating: (48) Feedback Score: 48 reviews	1st - Learn proper grammar 2nd - what the hell does the exhaust has to do with 'electric cutout'? 3rd - The two US and JDM oem catbacks are probably the same but who cares since they both are restrictive to turbo motors. Do you even understand what back pressure is and it's effect on na vs turbo motors?

09-13-2006, 01:08 PM	#3
driftkid316 Zilvia Member Join Date: Apr 2005 Location: corona, ca Posts: 198 Trader Rating: (2) Feedback Score: 2 reviews	first off i did a typo, meant gettin Rid of huge n1. and yes i do understand the effects of back pressure on na and turbo motors. and the electric cutout has to do with the exhuast cause it goes on the exhaust system. obviously the stock catbacks are restrictive to turbo motors, what oem exhausts arent restrictive to their motors. the point of my question was if the JDM stock one was larger, would using the US one be too small, creating too much back pressure. I just want to run a quiet stock looking exhaust, and thats where the cutout comes in, so i can flip the switch and run open downpipe.

09-13-2006, 02:01 PM	#4
Neejay Post Whore! Join Date: Jan 2004 Location: lol Age: 39 Posts: 2,586 Trader Rating: (2) Rides Gallery: Neejay Feedback Score: 2 reviews	Are you basically asking if you used a USDM cut-out, would that be too restrictive on JDM piping?

09-13-2006, 02:07 PM	#5
kensreliableb18b Zilvia Addict Join Date: Jun 2004 Location: so cal - 626, 909, 562 and 949. 818 if i feel like running away Posts: 945 Trader Rating: (1) Feedback Score: 1 reviews	running usdm exhaust with sr wont blow up your motor. so just put on your cutout.

09-13-2006, 02:12 PM	#6
spirit Zilvia Member Join Date: Dec 2005 Location: california Posts: 272 Trader Rating: (3) Feedback Score: 3 reviews	I'm running a stock replacement on my sr20det, made by bosal. Made for the 240sx fits just fine on my sr20det. Car runs fine, only thing that might be an issue, turbo spool up... I get mad power jump at 3k rpm (bad enough to not spin tires at take off but as soon as I hit 3k rpm it breaks loose).

09-13-2006, 02:13 PM	#7
bleachcola Leaky Injector Join Date: Sep 2006 Location: Michigan Age: 44 Posts: 132 Trader Rating: (0) Feedback Score: 0 reviews	i think he wants to go back to a quiet stock exhaust while driving normally, but have the cutout option near the downpipe for when he is racing etc. that way the turbo wont have any back pressure which is best.

09-13-2006, 02:30 PM	#8
ManoNegra Guild of Skullduggerous Intent Join Date: Jan 2004 Location: Socal Posts: 7,841 Trader Rating: (48) Feedback Score: 48 reviews	So this is what you were referring to by 'electronic cutout'? (electronic cutout = battery kill switch to most people) Seen video of Japanese cars running them work fine, no worries if driving normally 70mm so it's better for 3" catbacks.

09-13-2006, 09:13 PM	#9
Darkvillin Leaky Injector Join Date: Aug 2006 Location: Conway AR/ Toms River NJ Age: 39 Posts: 94 Trader Rating: (1) Feedback Score: 1 reviews	what's wrong with running an exhaust like the rsr? it looks stock, sounds really quiet, and when you get on the gas it isnt restrictive. i say look into it.