DriftX
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249 posts
'89 240sx
Franklin NC
4-7-2007
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I'm assuming you've set tps and base timing..
Do you have a wideband?
Are those injectors stock?Clean car! Very nice detail work
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rotorimp
Master Fabricator
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778 posts
Nissan 240sx RB25det, 2007 Titan
Surprize az
7-21-2006
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| « Re: (DriftX) | 10:58 AM 7/6/2008 |
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My best guestimate is that the timing is close (it will not idle below 2000rpm)--IACV could be a factor but I don't think it would run as rich as it does. TPS is spot on. The injectors/ECU is stock and no I don't have a wide band.
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DriftX
Offline
249 posts
'89 240sx
Franklin NC
4-7-2007
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hm.. 2000 rpm is a difficult place to time..base timing is at 15deg.. so arount 2k rpm to account for timing advance it should be at roughly 20deg or so i would imagine. You need to fix the aicv first then reset timing. Then check your maf
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streeteg
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141 posts
hamilton nj
3-31-2007
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| « Re: (DriftX) | 12:33 PM 7/6/2008 |
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I like what you did with that greddy manifold. I wish i got mine done before I put it on. That looks sexy
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BoostFab
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3223 posts
Nissan Land
12-3-2003
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| « Re: Got my RB running (only took 2 years) and 1 birrion dorrars (rotorimp) | 1:07 PM 7/6/2008 |
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looking good.are you running larger injectors ?
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Bwana
Super Moderator
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5574 posts
'89 240 coupe RB25DET '77 MGB CA18DET
Fort Collins CO
9-16-2004
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Grats Jason! It looks fantastic! A couple kinks to work out and you'll be set!
| Quote, originally posted by r34 gtr » | | Yeah man, I hear ya. I went out to my car yesterday to go job hunting and when I opened the door my balls melted off. True story. |
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rotorimp
Master Fabricator
Offline
778 posts
Nissan 240sx RB25det, 2007 Titan
Surprize az
7-21-2006
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| « Re: (Bwana) | 3:48 PM 7/6/2008 |
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Thanks. I'm on the look out for a MAF and IACV (at least it is easy to get to) I'm sure the Timing is in the ball park based on where it is at @ 2000 rpm.
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rotorimp
Master Fabricator
Offline
778 posts
Nissan 240sx RB25det, 2007 Titan
Surprize az
7-21-2006
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| « Re: (rotorimp) | 3:50 PM 7/6/2008 |
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It is kinda hard to make out in the picture but I had the manifold and the valve covers powdercoated wrinkle black.
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Coolwhip
NICO Sponsor
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1549 posts
Orlando Florida
2-6-2004
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again, are you running stock injectors? And they might be leaking (regardless stock or not). Just a guess.Engine looks great. I like what you did with it. Boost leak check your system as well. And if you need a MAF just shoot me an email.
Treasurer of the NRRBA - Non-Running RB Association
Join today! Temporary and Lifetime memberships available. Send your dues to me.
"Parts for a complete and balanced engine"
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rotorimp
Master Fabricator
Offline
778 posts
Nissan 240sx RB25det, 2007 Titan
Surprize az
7-21-2006
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| « Re: (Coolwhip) | 4:36 PM 7/6/2008 |
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Stock Injectors--checked for boost leaks/E-mail sent
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Sil240
Offline
1983 posts
LINY
4-28-2003
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Really nice bro.
Good luck with getting it running straight
Love the double projectors..Just a quick question.
What is under the Humps of the RB25 valve covers????
"The Strong move Quiet, The Weak start Riots"
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neonbomb
Online
288 posts
Pittsburgh/Detroit
4-22-2007
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| « Re: (Sil240) | 2:19 PM 7/7/2008 |
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Those are 26 valve covers if im not mistaken.
1995 S14 100% Stock + neo  1990 z32 300zx Stage 4++ *RIP*
2002 Subaru GD Impreza WRX Sold
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Coolwhip
NICO Sponsor
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1549 posts
Orlando Florida
2-6-2004
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| « Re: (neonbomb) | 3:03 PM 7/7/2008 |
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no those are in fact 25 covers
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rotorimp
Master Fabricator
Offline
778 posts
Nissan 240sx RB25det, 2007 Titan
Surprize az
7-21-2006
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| « Re: (Coolwhip) | 6:31 PM 7/7/2008 |
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Yep ---25 just powder coated
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Sil240
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1983 posts
LINY
4-28-2003
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But whats under those humps???
Your lovely 25 humps... lol
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rotorimp
Master Fabricator
Offline
778 posts
Nissan 240sx RB25det, 2007 Titan
Surprize az
7-21-2006
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| « Re: (Sil240) | 9:11 PM 7/7/2008 |
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Hate to admit it but the same thing was going through my mind-rotfl
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Voltron240
Offline
9 posts
1989 240 coupe
Glendale az
5-16-2008
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| « Re: (DriftX) | 10:16 PM 7/7/2008 |
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| Quote, originally posted by DriftX » | I'm assuming you've set tps and base timing..
Do you have a wideband?
Are those injectors stock?Clean car! Very nice detail work |
My Rb Is doing the same thing. The timing is on but what do i have to do to set the TPS
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rotorimp
Master Fabricator
Offline
778 posts
Nissan 240sx RB25det, 2007 Titan
Surprize az
7-21-2006
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| « Re: (Voltron240) | 5:55 AM 7/8/2008 |
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You can back probe the tps (middle pin) and at fully closed the output voltage should be .4 to .5v according to the FSM. I have the Blazt/consult hooked up so I can see what the ecu sees to set mine. My car just wants to run rich so hopefully the MAF will fix it.
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neonbomb
Online
288 posts
Pittsburgh/Detroit
4-22-2007
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| « Re: (rotorimp) | 10:45 AM 7/9/2008 |
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My bad those humps confused me. Thanks for the TPS info, im going to check this on mine tonight if my new cas bracket gets here.
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Sil240
Offline
1983 posts
LINY
4-28-2003
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Seriously!!!What's under those humps???
Or is it just done for looks?
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Dano
Administrator (CAO)
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14269 posts
'95 240sx base/ '87 BMW 325iC
Kansas City but miss Phoenix
10-29-2002
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Congrats on getting it running Jason! Looks great! Good luck with the fuel woes.
National Association of Storm Chasers And Spotters MEMBER -- AIM: s14sx2nr
Love you Stace! Enjoy your wings!<3<3<3
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rotorimp
Master Fabricator
Offline
778 posts
Nissan 240sx RB25det, 2007 Titan
Surprize az
7-21-2006
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| « Re: (Dano) | 5:06 AM 7/11/2008 |
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Thanks Dan--any progress on your RB project? I will hopefully have the running issues sorted by this weekend
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Darius
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2957 posts
'97 240SX SE
Ames Iowa
3-2-2003
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| « Re: (Sil240) | 8:53 AM 7/11/2008 |
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| Quote, originally posted by Sil240 » | | Seriously!!! What's under those humps???
Or is it just done for looks? |
I'm pretty sure the humps have to do with the PCV baffling in the valve covers along with the cam lobe covers on the 5 & 6 cylinders. Same with the RB26 except the humps extend further forwards. Not sure of how it all works together or the engineering behind it, but maybe someone else can fill that part in.
Former Vice President of the NRRBA - Non-Running RB Association
Join today! Temporary and Lifetime memberships available.
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rotorimp
Master Fabricator
Offline
778 posts
Nissan 240sx RB25det, 2007 Titan
Surprize az
7-21-2006
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| « Re: (Darius) | 6:14 PM 7/13/2008 |
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So made some progress this weekend. Turns out my Fuel pressure gage on the FPR was LYING to me---- rat bastard!!!! Put on my fuel pressure tester and WOW it was a wonder it would even run with pressure that high. So now IT RUNS like a raped ape!!! YIPPY So Now The only real problem is that It idles too high (32-3500rpm) MY TPS is Spot on according to FSM. Throttle plate is all the way closed. The only thing left is IACV (great more money I can piss away) Except for the high Idle it runs good.
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Coolwhip
NICO Sponsor
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1549 posts
Orlando Florida
2-6-2004
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| « Re: (Darius) | 7:43 AM 7/14/2008 |
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| Quote, originally posted by Darius » | I'm pretty sure the humps have to do with the PCV baffling in the valve covers along with the cam lobe covers on the 5 & 6 cylinders. Same with the RB26 except the humps extend further forwards. Not sure of how it all works together or the engineering behind it, but maybe someone else can fill that part in. |
Works just like a baffled catch can, to seperate as much oil from the blow by gas as possible, so when it vents through the PCV you're not getting an overwelming amount of oil back into your intake stream. If you look at the underside of the 26 covers you'll notice the difference between, R32/R33, R34, Nismo, and Mine's. BTW, Matt your Email is blocking and sending back all my emails to you. 
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rotorimp
Master Fabricator
Offline
778 posts
Nissan 240sx RB25det, 2007 Titan
Surprize az
7-21-2006
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| « Re: (Coolwhip) | 5:12 AM 7/17/2008 |
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Stock Brakes are a mistake with this motor!!!  Just about have all the bugs worked out. Blocked off the hose to The IACV/AAC and it idles now (with the throttle plate cracked) So I have to figure out if it is the IACV or the Aux Air valve. I havn't checked wiring to either so I'll do that tomorrow.
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Coolwhip
NICO Sponsor
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1549 posts
Orlando Florida
2-6-2004
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| « Re: (rotorimp) | 6:05 AM 7/17/2008 |
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stock brakes with any motor is a mistake in these cars. Thats of course, unless you beef things up with some killer pads, rotors, fuild and lines. Then you got a winner.Just get a volt/ohm meter and check the values on the 2 sensors. you'll narrow it down pretty quick that way.
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RBSilvia
Offline
58 posts
'89 RB25 240SX Coupe
MN/AZ
12-16-2007
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| « Re: (Coolwhip) | 7:01 PM 7/17/2008 |
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hey man, i've got an IACV if ya need one. i sent u an email
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rotorimp
Master Fabricator
Offline
778 posts
Nissan 240sx RB25det, 2007 Titan
Surprize az
7-21-2006
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| « Re: (RBSilvia) | 7:31 AM 7/18/2008 |
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I must be missing something!!!! I keep reading that the fuel pressure should be around 35 psi w/ vac at idle and around 42 w/ vac off. Is this right??????????????I can't get it to run right above 20psi--sound low??? It doesn't run lean. ever!! even under load. Infact at 20psi it runs AWSOME. I have walbro pump stock injectors and Saard FPR. In fact 10-15psi will also run fine???
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gawdzilla
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1620 posts
none
9-18-2004
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| « Re: (rotorimp) | 7:44 AM 7/18/2008 |
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| Quote, originally posted by rotorimp » | | I must be missing something!!!! I keep reading that the fuel pressure should be around 35 psi w/ vac at idle and around 42 w/ vac off. Is this right?????????????? I can't get it to run right above 20psi--sound low??? It doesn't run lean. ever!! even under load. Infact at 20psi it runs AWSOME. I have walbro pump stock injectors and Saard FPR. In fact 10-15psi will also run fine??? |
that's corect. about 37ish on vacuum and 43.5 psi w/ vac off. your pressure numbers are way off. try adjusting the regulator. also check for leaks. also is your gauge accurate?
Just your average dreamer looking for a 240 
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rotorimp
Master Fabricator
Offline
778 posts
Nissan 240sx RB25det, 2007 Titan
Surprize az
7-21-2006
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| « Re: (gawdzilla) | 7:50 AM 7/19/2008 |
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Here is the deal I have had three different gages!!!!! According to the gages it likes to run around 15 psi--shouldn't even be running!!! Anything above 20 and it will stall because it starts running too rich. Could it be a volume thing???? I can set it 15 and drive it hard and it never runs lean. I have had THREE gages on it. The firs one wa the one on the FPR, the second was a Autozone gage and the third was a friends Snap-on gage. What am I missing? Sounds and runs really good!!!!! Just can't figure out why it runs at that psi
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