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08-09-2008, 11:50 PM
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#1
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Senior Member
Join Date: Oct 2002
Posts: 1,871
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3.5 swap power loss?!!
VIDEOS AT THE BOTTOM FOR THE EYE lol
well pretty much I just finished the 3.5swap and my car runs fine.. lots of power up to 6000rpms but once it gets to 6000 it falls on its face! I mean it literally won't pull to 7200 as if the fuel cuts at 6000 because the A/F reads as normal until 6000 then it drops past LEAN and doesn't read anymore. I've even tried addin as much as +20% of fuel and as little as -5% of fuel and still does the samething.
Any idea of what it is cuz it runs like sh*t after 6000
Last edited by ghostmax301; 08-28-2008 at 11:01 PM.
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08-10-2008, 01:21 AM
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#2
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Hibernating
Join Date: Jan 2005
Location: Philadelphia
Posts: 1,218
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Stock or aftermarket pump / psi regulator?
Do you have a fuel gauge?
I would think to have some one check your fuel pressure during wot.
Have you tried reving past 6k while in neutral?
__________________
Weird things happen when drawings come to life.
Old setup=3.5/ssim/H/Y/C/Arp stuff/Vlsd/3"exhaust/NX (whats in your nozzle?)
217whp 209wtq N/A
13.9@100.27
???whp ???wtq Nitrous
12.9@111.81 Dragradials
http://www.youtube.com/watch?v=9IizQezbiBA
3080 Lbs with driver (notarized proof)10/2008
Around 3000 with driver (present)
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08-10-2008, 07:28 AM
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#3
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Peak a boo.
Join Date: Apr 2006
Location: Omaha, NE
Posts: 4,082
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What are you using for engine management?
__________________
Bros Before Hoes!!!!!!!!!!!!
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08-10-2008, 08:01 AM
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#4
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Senior Member
Join Date: Nov 2004
Location: Minnesota
Posts: 772
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my guess would be he is using apexi. maybe the fuel pump is weak? i would deffently check your Fuel pressure as stated above
__________________
1997 GXE 5 Speed CG2 RIP 160k (My new parts car)
1996 SE 5 Speed KH3 awaiting |00vi(done )|EU,100 shot(Hopefully)|97 front and rear end swap|
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08-10-2008, 08:29 AM
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#5
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Senior Member
Join Date: Oct 2002
Posts: 1,871
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ok,ill try checking the fuel fump and pressure. my setup is VAFCII, dek FPR on the rear bank(return line going to it) and dek damper on the front bank(feed line going to it).
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08-11-2008, 06:58 AM
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#6
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Supporting Maxima.org Member
Join Date: Oct 2005
Posts: 3,663
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And what exactly is your fuel pressure?
Name brand fpr and gauge?
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08-11-2008, 04:40 PM
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#7
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Senior Member
Join Date: Jun 2003
Posts: 2,080
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you said the a/f reads "LEAN", do you have a ricer narrowband wideband readout (those are the "light show" ones that just blink back and forth bet'n RICH and LEAN) or a legit wideband?
if its a wideband, whats the ACTUAL a/f ratio?
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08-11-2008, 10:35 PM
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#8
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Senior Member
Join Date: Oct 2002
Posts: 1,871
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well i have a stock fpr right now, waiting for my AFPR to come in. As for the A/F gauge, Yes, sadly its a narrow band but i have it hooked up to the signal wire of the front bank o2 so i can ATLEAST have some type of idea of whats going on. But i DO plan on getting an electric cutout and WBo2 as my next mods before anything else.
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08-12-2008, 11:44 AM
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#9
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Build.
Join Date: Apr 2003
Location: Miami, FL
Posts: 8,166
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I still don't understand completely what's going on. Is there like a pseudo-rev limit at a certain RPM where you just can't pass it no matter what, even in neutral? Or does the motor feel like it falls flat on it's face like the USIM does past 5.5k?
__________________
"Men occasionally stumble over the truth, but most of them pick themselves up and hurry off as if nothing ever happened."
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08-13-2008, 06:00 PM
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#10
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Senior Member
Join Date: Nov 2004
Location: Minnesota
Posts: 772
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[quote=ghostmax301;6570310] Yes, sadly its a narrow band but i have it hooked up to the signal wire of the front bank o2 so i can ATLEAST have some type of idea of whats going on. quote]
using a narrowband for tuning is really not recomended. i would deffently get a wideband asap!!
__________________
1997 GXE 5 Speed CG2 RIP 160k (My new parts car)
1996 SE 5 Speed KH3 awaiting |00vi(done)|EU,100 shot(Hopefully)|97 front and rear end swap|
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08-18-2008, 06:21 AM
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#11
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Supporting Maxima.org Member
Join Date: Feb 2005
Posts: 575
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Maybe its just me, Do you have a JWT ECU or EU... Coz i just read and you have a rev-limit of 7200RPMs. And +1 on the wideband saves a lot of trouble and money in the long run.
__________________
98 Nissan Maxima..
Mods..
Supercharged, FMIC, K&N CAI, 00VI, VAFCII, Short Ram intake, Budget Y, warpspeed high flow cat, Greddy SP2 Catback, dropped!! 
Zeitronix wideband and datalogging laptop just for tuning
18x8 G35 rims wrapped in Dunlop W10 235/40/18 tires.
Z32 4piston calipers, Cobra Xdrilled/Slotted.
14lbs Super Charged Sleeper@332fwhp 
SOON: RC440cc injectors, Transmission, clutch and headers!!
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08-18-2008, 06:54 AM
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#12
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Senior Member
Join Date: Oct 2002
Posts: 1,871
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just an update,
I have my AFRP in now set at about 39psi. The only reason I set it that high at idle was because if I revved the can in neutral, the fuel psi would drop to about 32psi. Also,I changed my plug and ALL of them were flat black on the end of them and it wasn't rubbing off? was that from running rich?
The WBo2 sensor is the next buy. Funds are tight right now so I going to have to hold off for a week or 2 untill I get it.
Going to the track on some Hoosiers on friday,ill let yu guys know what happens. From my past runs, and experience driving others car, im expecting a 13.3-13.8 @ 99-104
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08-25-2008, 12:39 AM
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#13
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Senior Member
Join Date: Oct 2002
Posts: 1,871
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ok, soooo. Went to the track................14.40@95
car seems to be running good, NO driver error..WTF IS GOING ON???!!
Only unnormal thing going on is the fuel PSI dropping so much as i rev? Is it suppose to do this or do i possibly have a bad fuel pump?
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08-25-2008, 10:05 AM
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#14
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Senior Member
Join Date: Oct 2002
Posts: 1,871
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well I went and fixed the small vacuum leaks today and the car runs even worse... it deffinently feels like somethings literally holding the car back..as if there was a towel over my MAF or something..anyone know what's going on?
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08-25-2008, 11:03 AM
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#15
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Blown
Join Date: May 2003
Location: Charlottesville, VA
Posts: 7,213
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Quote:
Originally Posted by ghostmax301
ok, soooo. Went to the track................14.40@95
car seems to be running good, NO driver error..WTF IS GOING ON???!!
Only unnormal thing going on is the fuel PSI dropping so much as i rev? Is it suppose to do this or do i possibly have a bad fuel pump?
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your fuel pressure goes down as you rev the car higher? That should not happen. It should go up.
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08-25-2008, 11:15 AM
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#16
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Senior Member
Join Date: Oct 2002
Posts: 1,871
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Quote:
Originally Posted by cardana24
your fuel pressure goes down as you rev the car higher? That should not happen. It should go up.
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yep, I Have it set at 40psi(just because it drops soo low at redline ) and when I rev it..it'll be around 28-32psi.
What's is the purpose of the vaccum on the afrp? I was going to unplug it when I get off and see if it still drops? but I swear I can't find anymore vacuum leaks 
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08-25-2008, 11:41 AM
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#17
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Blown
Join Date: May 2003
Location: Charlottesville, VA
Posts: 7,213
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Quote:
Originally Posted by ghostmax301
yep, I Have it set at 40psi(just because it drops soo low at redline ) and when I rev it..it'll be around 28-32psi.
What's is the purpose of the vaccum on the afrp? I was going to unplug it when I get off and see if it still drops? but I swear I can't find anymore vacuum leaks |
That's not good.
I am guessing it needs the vacuum to know what the engine is doing to know how much fuel to supply. I would double check your install on the FPR.
**also I should probably say that any advice I am giving about this is based on my boosted engine. I have never used an AFPR on an N/A engine, so if I am off hopefully someone else will speak up. But I know even before my engine goes into boost when I just blip the gas my FP rises.
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08-25-2008, 12:10 PM
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#18
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Senior Member
Join Date: Oct 2002
Posts: 1,871
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well the sad thing is,my afpr didn't come with installation instructions but it had a fuel fitting on the side and ont the bottom. vacuum port on the other side and adjustment screw on the top...I have the feed going in through the side port an the return going out through the bottom..does this seem correct? when I raise the Fuel PSI,the idle raises so I think its hooked up right
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08-25-2008, 12:26 PM
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#19
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Blown
Join Date: May 2003
Location: Charlottesville, VA
Posts: 7,213
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Quote:
Originally Posted by ghostmax301
well the sad thing is,my afpr didn't come with installation instructions but it had a fuel fitting on the side and ont the bottom. vacuum port on the other side and adjustment screw on the top...I have the feed going in through the side port an the return going out through the bottom..does this seem correct? when I raise the Fuel PSI,the idle raises so I think its hooked up right
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which regulator is it? I am sure the instructions are probably online. It may be hooked up right but you probably want to check it since it sounds like you are running out of gas up top.
I have an AEM regulator so I would have to look at mine before I could comment on your current set up.
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08-25-2008, 01:08 PM
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#20
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Senior Member
Join Date: Oct 2002
Posts: 1,871
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Quote:
Originally Posted by cardana24
which regulator is it? I am sure the instructions are probably online. It may be hooked up right but you probably want to check it since it sounds like you are running out of gas up top.
I have an AEM regulator so I would have to look at mine before I could comment on your current set up.
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well,its a universal,no name brand . Im leaning towards getting a 255lph fuel pump and hoping the solves the problem. Might even go grab one from the junkyard(stock) to make sure if it is my fuel pump
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08-25-2008, 04:59 PM
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#21
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Senior Member
Join Date: Oct 2002
Posts: 1,871
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correction...the car won't let me set the fuel pressure above 38psi now nd when I rev it,it jumps down to 19psi |
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08-25-2008, 05:16 PM
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#22
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The Dirty Pearl
Join Date: Jul 2005
Location: Pasadena, MD
Posts: 6,475
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Quote:
Originally Posted by ghostmax301
well,its a universal,no name brand . Im leaning towards getting a 255lph fuel pump and hoping the solves the problem. Might even go grab one from the junkyard(stock) to make sure if it is my fuel pump |
If you need a stock fuel pump, I've got 10 or so in my box. They're Z/G pumps, but AFAIK the same thing.
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08-25-2008, 05:42 PM
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#23
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Senior Member
Join Date: Jun 2003
Posts: 2,080
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perhaps the reason ur fuel pressure dips is simply because your fuel pump is going out. Thats really what it sounds like to me. Our cars are no longer 2yo and trouble free, things do take craps over time on 10yo+ cars, including fuel pump.
You shouldnt even be making a big deal about running a 14.4. After all, last I saw, you still had an old fuel pump thats possibly taking a crap (replace it with at least a Walbro 190, that worked fine for me All-Motor), you have no idea where the a/f is so of course, no idea how bad the tune is (and yes, as YOU already know, 97% of 3.5 swaps here run like crap [relatively] due to lack of tuning  ).
Upgrade the fuel pump, get a wideband, tune it, THEN go back to the track and see some real #s.
Best of luck! |
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08-25-2008, 05:49 PM
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#24
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