Wacky Fuel pressure
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Turbo4door1 Paid to pewp
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posted 05/25/03 11:07 PM
At WOT, the stock regulator is fine. For normal day to day drivng, having the stock regulator makes it nearly impossible to tune completely with a high pressure/high volume pump. (I'm running the Denso TT-Supra pump, so I am definitely having this problem.) Marty G. still uses the stock regulator (which surprised me when I saw his car at our Northern VA GVR-4 get together). He not only drags the car, but frequently road races it and dynoed over 400HP at the wheels - closer to 450 if I recall correctly. Probably runs very rich at idle and part throttle. but under boost, he says it is more than sufficient. I as well ordered an AFPR from ChargedAir, but got tired of waiting and not getting a response to my emails and phone calls, so I just reversed billed it through my credit card. I heard that Ramchargers is getting ready to make a bolt on one for DSMs, but I'm not sure I want to wait any longer. Looks like Buschur will be recieving a phone call for one of his modified Aeromotive units. Should have went that route in the first place, and not tried to save a few bucks....!!!!!!
Posts: 1519 | From: Kearneysville, WV | Member Since: 02/20/03 | IP: (63.188.104.186) |
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Hertz  OneTitle to rule them all. 77/2000
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posted 05/27/03 12:19 PM
quote: Originally posted by bujang_hensem: hai guys...currently i have change my fuel pump to nissan skyline pump...but don't know which model...because i need bigger pump...but i think it is not the skyline rb26det pump...previously i'm using my standard 4g63NA pump...and not enough fuel....well my problem are...after changing the pump my idle has problem...at idle my car idle not smooth anymore....like not enough fuel/ruiing to rich...and computer box tried tried fix it...that why my idle is suffer....i'm still running stock fuel regulator....can rewiring fuel pump solve this problem...
Rewiring ensures that a consistent voltage reaches your pump. This is more of a "fix" for higher-rpm problems, whereas a new adjustable fuel pressure regulator is more of a "fix" for lower-rpm/idle problems.
You should do both.
Posts: 13500 | From: Chicago, IL | Member Since: 07/29/02 | IP: (67.163.58.52) |
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4orced4door  Out Standing
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posted 05/27/03 05:31 PM
quote: Originally posted by 04DrBlur: Since I am in a pinch and need a FPR I want to go get the B&M commandflo until my chargedair unit comes(if it ever will...). I need to know how big to drill out the orifice in the stock regulator. I have a spare and am goin to drill it out and get it ready so I can just bolt it up.
Just in case you didn't know, you can't lower pressure with the B&M unit, so if you are trying to rectify a rich condition it's not going to help you. My brother has one.
Posts: 9846 | From: Raleigh, NC | Member Since: 07/19/02 | IP: (65.33.242.24) |
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ken inn BJ Titsengolf lifer
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posted 05/27/03 07:21 PM
when i did my fuel pump, i installed the 3kgt vr4 pump, and WITH NO OTHER CHANGES, my jumptronix went from .91 clear to .99. even after a couple of weeks, it never came down much, i was still getting .94-.96 wot. after i got the spoolinup afpr, i adjusted it to 36 psi static, 27 at idle with the vacuum attached. then, i rewired the pump, idle jumped to 29, and i had to retune the afc for low throttle. i am convinced that the adjustable fpr enables a much finer tuning, no matter what pump you have. even stock.
Posts: 7529 | From: krum texas | Member Since: 02/23/01 | IP: (4.47.42.108) |
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keydiver Unregistered
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posted 05/28/03 09:58 AM
quote: Originally posted by 04DrBlur: I have a full machine shop where I work. And a good friend whom works for a steel factory. I can assure you that I can drill it out. Just need to know how big I should make it. If I had the whole drilled out why would the B&M not lower fuel pressure when it claims it is adjustable from 25 psi- 60psi?
That would be fantastic if you could figure a way to drill that orifice out. I've tried several times to drill out my GVR-4 or 3000GT regulators, but did nothing but break off drill bit after drill bit. As far as the size, let me give you one point of measure: the AEM regulator comes with 3 different orifices, .100, .150, and .200. The stock orifice is <.100, if I remember correctly. I think I tried to get mine up to about .125", but .150 would be even better if there is enough material there. Good luck!
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Ant Unregistered
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posted 05/28/03 10:08 AM
quote: Originally posted by ken inn: it's because of your stock regulator. now you know why i keep harping on adjustable fuel pressure regulator,
I have a rewired walbro 255 with a B&M FPR and the gauge still bounces around from 46-50psi with the hose on. With the hose off I can set it to 50psi and it only bounces about +/- 1psi
Ant
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ken inn BJ Titsengolf lifer
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posted 05/28/03 01:31 PM
quote: Originally posted by Ant: quote: Originally posted by ken inn: it's because of your stock regulator. now you know why i keep harping on adjustable fuel pressure regulator,
I have a rewired walbro 255 with a B&M FPR and the gauge still bounces around from 46-50psi with the hose on. With the hose off I can set it to 50psi and it only bounces about +/- 1psi
Ant
ok, whatever you are saying has gone well over my head. please explain.
Posts: 7529 | From: krum texas | Member Since: 02/23/01 | IP: (209.220.6.232) |
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