Blacktop running rich/poor after upgrades - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Josho · 03-29-2011, 03:05 PM

Ok here's the situation.. I have a 93 Nissan Silvia originally equipped with a redtop sr20det. The car ran perfect stock. Now I have a s13 Blacktop with a built head, gt2871r turbo, walbro 255, stock injectors, maf and a stock Blacktop ecu. Now obviously the car would run a little rough but it's still driveable. The only problem it gives me is every now and then it'll shut off when I let off the gas and come to a stop.

Ok, so when I purchased the blacktop(already built) I also bought this guys tuned ecu. He had it tuned for the same mods including the turbo. They only mods I was missing was the z32 maf and 850cc injectors(which his ecu was tuned for as well). So I bought a new maf and injectors and installed them and the tuned ecu. With that installed the car cranks up just fine but rins very rough. I can rev it up as high as I want but it breaks up real bad. I swapped my maf with a known good one and it runs the same.. Any suggestions? Could the ecu be bad? I also have a coolant temp sensor out of a redtop, not sure if that matters.

Sileighty_85 · 03-29-2011, 03:16 PM

So your running a Black Top ECU with a Red Top Harness?

Depending on the Black Top ECU, You'll have to repin the ECU harness.

I forgot which one needs to be repinned so just look around here and see

chetos13 · 03-29-2011, 03:24 PM

fpr or the vac lines check them out fpr might not be getting the correct vacuum

Josho · 03-30-2011, 07:08 AM

I think my ecu and harness setup is fine. I have 2 E5 ecu's. The stock one(which makes the car run pretty decent) and the tuned one(makes the car run like s**t). Could it really be a vac. issue just because I swapped the ecu and added bigger injectors and maf? It would kinda make sense but could someone explain why, if that is the case.

Josho · 04-01-2011, 06:06 PM

My major concern is the ecu. Can anybody atleast rule out the ecu as being the problem?

usdm180sx · 04-01-2011, 06:26 PM

Get that shit properly tuned with a programmable ecu

KiLLeR2001 · 04-01-2011, 06:36 PM

Which O2 sensor are you running? If you are using the E5 ECU, you need the fat type sensor.

Josho · 04-02-2011, 07:22 AM

I have the cross reference o2 sensor. I think it was the TT z32. It's fat.

PoorMans180SX · 04-02-2011, 07:54 AM

How long did you run the car "stock" with the 2871R and at what boost?

Who is the ECU tuned by?

jchrisw85 · 04-02-2011, 08:07 AM

is your bov recirculated?

kojiki88 · 04-02-2011, 08:35 AM

Quote:

Originally Posted by Sileighty_85

So your running a Black Top ECU with a Red Top Harness?

Depending on the Black Top ECU, You'll have to repin the ECU harness.

I forgot which one needs to be repinned so just look around here and see

I know you have repin the Type X Harness if you want to use another ECU that is not a Type X. Could be the tune in the ECU, Not every Motor runs the same even with Similar builds. GL

Josho · 04-03-2011, 01:42 AM

ecu is an enthalpy tune.. I think. I'll double check that.

My bov in not recirculated.

As for the tune; I bought the motor from him aswell. We had the same turbo only his had a bigger exhaust housing. Other then that, everything was the exact same thing.

Josho · 04-14-2011, 05:29 PM

hoping to get this situation figuered out this weekend. Anymore suggestions would be greatly appreciated.

Josho · 05-02-2011, 07:04 PM

Upated with video

03-29-2011, 03:05 PM	#1
Josho Zilvia Junkie Join Date: Mar 2010 Location: AL Posts: 310 Trader Rating: (7) Feedback Score: 7 reviews	Blacktop running rich/poor after upgrades Ok here's the situation.. I have a 93 Nissan Silvia originally equipped with a redtop sr20det. The car ran perfect stock. Now I have a s13 Blacktop with a built head, gt2871r turbo, walbro 255, stock injectors, maf and a stock Blacktop ecu. Now obviously the car would run a little rough but it's still driveable. The only problem it gives me is every now and then it'll shut off when I let off the gas and come to a stop. Ok, so when I purchased the blacktop(already built) I also bought this guys tuned ecu. He had it tuned for the same mods including the turbo. They only mods I was missing was the z32 maf and 850cc injectors(which his ecu was tuned for as well). So I bought a new maf and injectors and installed them and the tuned ecu. With that installed the car cranks up just fine but rins very rough. I can rev it up as high as I want but it breaks up real bad. I swapped my maf with a known good one and it runs the same.. Any suggestions? Could the ecu be bad? I also have a coolant temp sensor out of a redtop, not sure if that matters. Last edited by Josho; 05-02-2011 at 07:02 PM..

03-29-2011, 03:16 PM	#2
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	So your running a Black Top ECU with a Red Top Harness? Depending on the Black Top ECU, You'll have to repin the ECU harness. I forgot which one needs to be repinned so just look around here and see __________________ 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

03-29-2011, 03:24 PM	#3
chetos13 Zilvia Member Join Date: Mar 2008 Location: las vegas, nv Age: 39 Posts: 206 Trader Rating: (2) Feedback Score: 2 reviews	fpr or the vac lines check them out fpr might not be getting the correct vacuum __________________ TEAM ELITE

04-01-2011, 06:26 PM	#6
usdm180sx Post Whore! Join Date: Dec 2005 Location: 562 Posts: 4,807 Trader Rating: (5) Rides Gallery: usdm180sx Feedback Score: 5 reviews	Get that shit properly tuned with a programmable ecu __________________ -Norm!

04-01-2011, 06:36 PM	#7
KiLLeR2001 Post Whore! Join Date: Jun 2007 Location: オーランドフロリダ Posts: 7,955 Trader Rating: (46) Feedback Score: 46 reviews	Which O2 sensor are you running? If you are using the E5 ECU, you need the fat type sensor. __________________

03-30-2011, 07:08 AM	#4
Josho Zilvia Junkie Join Date: Mar 2010 Location: AL Posts: 310 Trader Rating: (7) Feedback Score: 7 reviews	I think my ecu and harness setup is fine. I have 2 E5 ecu's. The stock one(which makes the car run pretty decent) and the tuned one(makes the car run like s**t). Could it really be a vac. issue just because I swapped the ecu and added bigger injectors and maf? It would kinda make sense but could someone explain why, if that is the case.

04-01-2011, 06:06 PM	#5
Josho Zilvia Junkie Join Date: Mar 2010 Location: AL Posts: 310 Trader Rating: (7) Feedback Score: 7 reviews	My major concern is the ecu. Can anybody atleast rule out the ecu as being the problem?

04-02-2011, 07:22 AM	#8
Josho Zilvia Junkie Join Date: Mar 2010 Location: AL Posts: 310 Trader Rating: (7) Feedback Score: 7 reviews	I have the cross reference o2 sensor. I think it was the TT z32. It's fat.

04-02-2011, 07:54 AM	#9
PoorMans180SX Zilvia.net Advertiser Join Date: Nov 2005 Location: Michigan Age: 37 Posts: 5,616 Trader Rating: (16) Rides Gallery: PoorMans180SX Feedback Score: 16 reviews	How long did you run the car "stock" with the 2871R and at what boost? Who is the ECU tuned by? __________________ Build: http://zilvia.net/f/showthread.php?t=643065 Friends don't let friends buy knock-offs.

04-02-2011, 08:07 AM	#10
jchrisw85 Leaky Injector Join Date: Aug 2010 Location: Clifton, NJ Age: 39 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	is your bov recirculated?

04-03-2011, 01:42 AM	#12
Josho Zilvia Junkie Join Date: Mar 2010 Location: AL Posts: 310 Trader Rating: (7) Feedback Score: 7 reviews	ecu is an enthalpy tune.. I think. I'll double check that. My bov in not recirculated. As for the tune; I bought the motor from him aswell. We had the same turbo only his had a bigger exhaust housing. Other then that, everything was the exact same thing.

04-14-2011, 05:29 PM	#13
Josho Zilvia Junkie Join Date: Mar 2010 Location: AL Posts: 310 Trader Rating: (7) Feedback Score: 7 reviews	hoping to get this situation figuered out this weekend. Anymore suggestions would be greatly appreciated.

05-02-2011, 07:04 PM	#14
Josho Zilvia Junkie Join Date: Mar 2010 Location: AL Posts: 310 Trader Rating: (7) Feedback Score: 7 reviews	Upated with video