My Jdm motor is confusing me.

Raksj04 · 10-09-2012, 08:53 AM

I swapped in a JDM motor that is suppost to be a S4 motor, but it looks like the Primary fuel rail has a Pluse damper built into it, which I thought was S5, there is a Knock sensor in the center iron. However the Turbo has a twin scroll actutor, the alt is a S4 plug style. I noticed this while I was changing a broken fuel line. I am not worried or anything just confuzzed. Is it just JDM or is it a s4.5 or something?

***TitaniumTT*** · 10-09-2012, 09:24 AM

I suppose it is possible that in the last 13 years and it's travels from the factory, to probably a few different owners in another country, to it's journey 1/2way around the world to probably a few other people before you got it that there is the slightest chance that someone, somewhere, may have replaced a part or two on it.... I guess it's possible.

***TitaniumTT*** · 10-09-2012, 09:25 AM

PD's came stock on S4's

In fact, PD's are stock on just about every car ever made.... I don't undestand why people pull them off.

RETed · 10-09-2012, 02:53 PM

Quote:

Originally Posted by TitaniumTT

In fact, PD's are stock on just about every car ever made.... I don't undestand why people pull them off.

My reason is that my car on fire once already.
I don't want it to fail again.
It currently runs perfectly fine without it.
I don't want to go through the trauma when the dealer quoted me "$5,000" to fix everything...

-Ted

***TitaniumTT*** · 10-09-2012, 03:41 PM

Quote:

Originally Posted by RETed

My reason is that my car on fire once already.
I don't want it to fail again.
It currently runs perfectly fine without it.
I don't want to go through the trauma when the dealer quoted me "$5,000" to fix everything...

-Ted

True... the aftermkt ones don't leak though.... bad design from the factory, but they still serve a purpose..... I datalogged FPSI @ 200htz with and w/o a PD, it makes a difference. If the harmonics line up with the duty cycle of larger injectors (say 2000cc ID's) , it can affect AFR's either way. Braided SS line doesn't help, and FPR's aren't designed to handle the quick changes in fuel pressure.... one of the reasons I went with the nylon braided lines, and put a PD on the end of teh secondary.

RETed · 10-09-2012, 02:51 PM

Quote:

Originally Posted by Raksj04

I swapped in a JDM motor that is suppost to be a S4 motor, but it looks like the Primary fuel rail has a Pluse damper built into it, which I thought was S5,

Are the fuel rails cast aluminum or tube steel?
Cast aluminum = S4
Tube steel = S5
Also, JDM motors typically have the fuel routing backwards:
fuel line from fuel pump -> fuel filter -> *secondary fuel rail* -> *primary fuel rail* -> fuel line return back to fuel tank

The US-spec 13BT's always go primary fuel rail first and then secondary with the FPR in the secondary rail.

Quote:

there is a Knock sensor in the center iron.

S4 = center iron
S5 = (rear?) rotor housing

Quote:

However the Turbo has a twin scroll actutor, the alt is a S4 plug style. I noticed this while I was changing a broken fuel line. I am not worried or anything just confuzzed. Is it just JDM or is it a s4.5 or something?

Sounds straight up S4 to me...

-Ted

Raksj04 · 10-10-2012, 12:13 AM

Quote:

Originally Posted by RETed

Are the fuel rails cast aluminum or tube steel?
Cast aluminum = S4
Tube steel = S5
Also, JDM motors typically have the fuel routing backwards:
fuel line from fuel pump -> fuel filter -> *secondary fuel rail* -> *primary fuel rail* -> fuel line return back to fuel tank

The US-spec 13BT's always go primary fuel rail first and then secondary with the FPR in the secondary rail.

S4 = center iron
S5 = (rear?) rotor housing

Sounds straight up S4 to me...

-Ted

one is cast one is steel.

RETed · 10-10-2012, 05:10 AM

Quote:

Originally Posted by Raksj04

one is cast one is steel.

Wow, someone put together a mix-n-match special... :P

-Ted

Raksj04 · 10-10-2012, 06:41 AM

Quote:

Originally Posted by RETed

Wow, someone put together a mix-n-match special... :P

-Ted

This is why I was confused. I thought I also removed a PD when I swapped the motor. Which I thought was on the front of the secondary fuel rail but I maybe mistaken, it was years ago and I might be thinking about my N/A motor.

10-09-2012, 08:53 AM	#1
Raksj04 I have Ultra power in me. Join Date: Sep 2011 iTrader: (2) Posts: 457 Rep Power: 14	My Jdm motor is confusing me. I swapped in a JDM motor that is suppost to be a S4 motor, but it looks like the Primary fuel rail has a Pluse damper built into it, which I thought was S5, there is a Knock sensor in the center iron. However the Turbo has a twin scroll actutor, the alt is a S4 plug style. I noticed this while I was changing a broken fuel line. I am not worried or anything just confuzzed. Is it just JDM or is it a s4.5 or something?

10-09-2012, 09:24 AM	#2
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	I suppose it is possible that in the last 13 years and it's travels from the factory, to probably a few different owners in another country, to it's journey 1/2way around the world to probably a few other people before you got it that there is the slightest chance that someone, somewhere, may have replaced a part or two on it.... I guess it's possible. __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

10-09-2012, 09:25 AM	#3
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	PD's came stock on S4's In fact, PD's are stock on just about every car ever made.... I don't undestand why people pull them off. __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**