SR20 Configuration Questions... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

IsaacMTSU · 04-20-2011, 10:16 PM

I have recently got an S14 with Redtop SR20DET back in running condition (after a shop wired up the coil signal wires wrong and couldn't figure it out). It has been sitting with no oil and the top cover and all hoses and wiring in the trunk for over 3 years. I have it running now... Anyway, I have no clue about what this car has on it. From what I can see, it has:

Stock ECU (E5)
Z32 MAFS
Full turbo back exhaust (with aftermarket O2 wired to ecu that may be a wideband?)
GT28RS (GT2860R is the same thing right?)
Stock injectors (I'm pretty sure)
Walbro pump
Lots of empty female connectors on ECU wiring (maybe a piggyback was there?)
GReddy Profec B-Spec II boost controller (boosts to 12psi)
It has some kind of aftermarket cams and adjustable cam sprockets
Other crap that doesn't matter for now...

The car has been driven a lot set up the way it is now. I have a narrow band A/F gauge wired up to it and it stays still just lean of the middle at idle and leans out slightly more when I got WOT and get up to 12psi (it never shows "rich" at all). I read that a narrow band gauge will just bounce around all the time though and this one doesn't. I also read the Z32 MAFS will run lean when used with a stock ECU. Do you think the ECU had a piggyback that is now missing? I know 12psi is too much for the stock injectors, but maybe that is just part of the problem. I upped the fuel pressure using the FPR screw and it leans out less at full boost than it did, but is there something missing in the whole setup?

Sileighty_85 · 04-20-2011, 10:43 PM

uhhh yeah, you need to tune the ECU for the MAFS, and yeah 12PSI on that Turbo is too much for stock INJ

IsaacMTSU · 04-20-2011, 10:54 PM

It runs awesome though, just seems a little lean by looking at the gauge. A Z32 MAFS on a stock ECU is supposed to run like crap though right? The ECU doesn't have any markings/stickers on it to show it has been tuned so that's why I say it is stock. Would a piggyback be the only reason for all the female connectors?

Sileighty_85 · 04-20-2011, 11:05 PM

open it up and look for a chip that sits on top, The wires depending on how many wires it might have been an SAFC

what color are the inj?

IsaacMTSU · 04-21-2011, 09:47 AM

From what I can see, there is no extra chip inside the ECU and the injectors are grey/black. I'll see which wires have a connector on them and post em up.

IsaacMTSU · 04-21-2011, 04:42 PM

Isaac Cogdill's Photos | Facebook
That's all I can do for a photo of my ecu for now since I'm at work, but Is this chip with tape strips from the factory? Also the female connectors that could possibly be from piggyback are on the black ground, white MAFS signal, ignition (black and red), and two on the tach signal. Any help would be great.

D.Bo · 04-21-2011, 05:43 PM

it has a tune

IsaacMTSU · 04-26-2011, 08:04 PM

Ok, other than the tuned ECU... The O2 sensor are both narrow band for sure. One is a fat 4 wire type in the turbo elbow and its wires are cut. There is another hooked up, but not working skinny 3 wire one in the exhaust pipe. Since the engine is a redtop, the O2 plug is a 3 wire. But, there are two. One is hooked up to the skinny O2 by the transmission and it looks like (faded) Black-Yellow?-Brown? 3 female plugs. Then there is one by the intake that is the normal Br/Y-White-Black, but it isn't hooked up. I tried running the 4 wire O2 to each of those plugs and my narrowband gauge just stays at .45V just like always does, even when the sensors are unplugged. My E5 ECU needs a 4 wire right?

IsaacMTSU · 05-05-2011, 10:00 PM

Bump.........

04-20-2011, 10:16 PM	#1
IsaacMTSU Join Date: Feb 2011 Location: East Tennessee Age: 33 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	SR20 Configuration Questions... I have recently got an S14 with Redtop SR20DET back in running condition (after a shop wired up the coil signal wires wrong and couldn't figure it out). It has been sitting with no oil and the top cover and all hoses and wiring in the trunk for over 3 years. I have it running now... Anyway, I have no clue about what this car has on it. From what I can see, it has: Stock ECU (E5) Z32 MAFS Full turbo back exhaust (with aftermarket O2 wired to ecu that may be a wideband?) GT28RS (GT2860R is the same thing right?) Stock injectors (I'm pretty sure) Walbro pump Lots of empty female connectors on ECU wiring (maybe a piggyback was there?) GReddy Profec B-Spec II boost controller (boosts to 12psi) It has some kind of aftermarket cams and adjustable cam sprockets Other crap that doesn't matter for now... The car has been driven a lot set up the way it is now. I have a narrow band A/F gauge wired up to it and it stays still just lean of the middle at idle and leans out slightly more when I got WOT and get up to 12psi (it never shows "rich" at all). I read that a narrow band gauge will just bounce around all the time though and this one doesn't. I also read the Z32 MAFS will run lean when used with a stock ECU. Do you think the ECU had a piggyback that is now missing? I know 12psi is too much for the stock injectors, but maybe that is just part of the problem. I upped the fuel pressure using the FPR screw and it leans out less at full boost than it did, but is there something missing in the whole setup?

04-20-2011, 10:43 PM	#2
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	uhhh yeah, you need to tune the ECU for the MAFS, and yeah 12PSI on that Turbo is too much for stock INJ __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

04-20-2011, 11:05 PM	#4
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	open it up and look for a chip that sits on top, The wires depending on how many wires it might have been an SAFC what color are the inj? __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

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04-20-2011, 10:54 PM	#3
IsaacMTSU Join Date: Feb 2011 Location: East Tennessee Age: 33 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	It runs awesome though, just seems a little lean by looking at the gauge. A Z32 MAFS on a stock ECU is supposed to run like crap though right? The ECU doesn't have any markings/stickers on it to show it has been tuned so that's why I say it is stock. Would a piggyback be the only reason for all the female connectors?

04-21-2011, 09:47 AM	#5
IsaacMTSU Join Date: Feb 2011 Location: East Tennessee Age: 33 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	From what I can see, there is no extra chip inside the ECU and the injectors are grey/black. I'll see which wires have a connector on them and post em up.

04-21-2011, 04:42 PM	#6
IsaacMTSU Join Date: Feb 2011 Location: East Tennessee Age: 33 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	Isaac Cogdill's Photos \| Facebook That's all I can do for a photo of my ecu for now since I'm at work, but Is this chip with tape strips from the factory? Also the female connectors that could possibly be from piggyback are on the black ground, white MAFS signal, ignition (black and red), and two on the tach signal. Any help would be great.

04-21-2011, 05:43 PM	#7
D.Bo Zilvia Member Join Date: Mar 2007 Location: New Orleans Age: 32 Posts: 283 Trader Rating: (0) Feedback Score: 0 reviews	it has a tune

04-26-2011, 08:04 PM	#8
IsaacMTSU Join Date: Feb 2011 Location: East Tennessee Age: 33 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	Ok, other than the tuned ECU... The O2 sensor are both narrow band for sure. One is a fat 4 wire type in the turbo elbow and its wires are cut. There is another hooked up, but not working skinny 3 wire one in the exhaust pipe. Since the engine is a redtop, the O2 plug is a 3 wire. But, there are two. One is hooked up to the skinny O2 by the transmission and it looks like (faded) Black-Yellow?-Brown? 3 female plugs. Then there is one by the intake that is the normal Br/Y-White-Black, but it isn't hooked up. I tried running the 4 wire O2 to each of those plugs and my narrowband gauge just stays at .45V just like always does, even when the sensors are unplugged. My E5 ECU needs a 4 wire right?

05-05-2011, 10:00 PM	#9
IsaacMTSU Join Date: Feb 2011 Location: East Tennessee Age: 33 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	Bump.........