mrsteve

iTrader: (1)

If yes state your problem and how it was corrected.
If no state the amount of time you've had the regulator installed.

mrsteve

iTrader: (1)

Who voted no and didn't respond? Mods could you edit the poll so you can see who posted what? I forgot to click that box while making the thread.

kthxbye

mattg

is there an alternative to the FPR that CT supplies? i don't want to deal w/ these issues. (when i get the s/c)

mrsteve

iTrader: (1)

I'm sure there is. But it would take some effort to figure out the correct rate at which pressure needs to rise for this motor. Unless someone already knows...


AEM makes an adjustable fuel pressure regulator that is about $100 cheaper than the Comptech unit.

They have applications for the 1st gen CL, 1st gen TL, and all years of the NSX. That has to work correct?

http://www.prostreetonline.com/buy/a...re_regulators/

mrsteve

iTrader: (1)

If the FPR that Comptech uses in the NSX kit has the same rate of rise as the CL kit I don't see why the AEM NSX regulator wouldn't work.


Wait, i'm installing the E-manage anyways so I'll be adjusting the rate the pressure rises anyways.

SCALBERT, need your opinion please!

Habib

I had and still have problems with the FPR. King Motorsports rec. a FPR with more adjustment points, I think they said it was a malbro. I bought the E-manage and need to hardwire it in which hill hopefully resolve the problem with the addition of some colder plugs.

mrsteve

iTrader: (1)

Which plugs do you have now? Are you supercharged?

NSX-Tuner

So far A-OK

mattg

must be walbro

ThinJim

iTrader: (3)

yes there is, i'll advise next week on it.

mrsteve

iTrader: (1)

Anxiously waiting. I'm hoping to install my e-manage next week and if I need to replace the fuel pressure regulator I might as well try something new.

Chemmech

So far it has worked good for me. I just checked it today. 35 psi at idle and pops right up to about 100psi at full throttle.

mrsteve

iTrader: (1)

Does it go to 100psi in all gears?

Chemmech

I think I may has a little problem with my fuel pump, I'm not sure though. When my gas tank is full the car seems to have more power than when the tank is half full, .

Chemmech

I'm not sure Steve, I don't have a gauge in my car, just a mechanics gauge that tees into the fuel line. I see max pressure with the car in park, rpm's to 4500.

scalbert

Yes, I have had problems with mine when I had it.

scalbert

If a replacement is sourced it needs to be a rising rate unit. Many adjustable FPR's are only 1:1 like stock, they just allow you to adjust the base pressure.

With a rising rate unit, such as a 8:1, you get about 8 PSI change in fuel pressure with every 1 PSI change in manifold pressure. For a non-E-Manage application, you would need about a 6:1 unit (maybe 8:1). With the E-Manage in place you should be able to use a 4:1 unit.

allmotor_2000

I've had two trouble-free. The problem might arise from running too high fuel-pressure?!? I have not hit > 80psi, but it appears several of the S/C folks are running 100psi consistently.

Keep in mind that at 100psi the fuel pumps don't flow as much fuel as at lower pressures!

scalbert

You have the generic one though. The one which comes with the SC kit is a little different. They had to do a redesign to get a faster ramp and higher pressure. Something about the piston bore/diameter was changed, etc.

I agree with the pressure portion, but it is the nature of the beat with the SC FPR.

mrsteve

iTrader: (1)

I'm hoping to have the e-manage installed next week. I'm going on a ski trip to PA in two weeks and then another ski trip to Denver, CO at the end of February and then a trip to Vegas in the middle of March so my funds are kinda tight! I'll definitely get around to installing that Wideband O2 next week though.

Hopefully even though I'm not pegging out at 100 hopefully i'll be A-OK

scalbert

Even with lower fuel pressure you will compensate with the E-Manage.

mrsteve

iTrader: (1)

With the re-cal'ed FPR and the E-manage program you created... how stressed are the injectors? How much more room do I have to play with them?

scalbert

With 80 - 90 PSI fuel pressure, I would say you can make at least 350 WHP before the injectors are even in the scopes.

mrsteve

iTrader: (1)

350 would be sick. I'd be more than pleased with 340 once I finally get the I/C installed. It's just amazingly cold all of a sudden up here and I have no desire to spend 3-4+ hours in a garage with Carl bolting this thing up, hahaha.

Although, the local tracks open in late Feb/early March so look for my I/C'ed dyno and track numbers then.

In the meantime, i'm hoping to get this e-manage hooked up and tuned for the non-intercooler setup to help the guys w/o the I/C gain a few horses. 300+whp with proper tuning would be great for the 5AT guys.

scalbert

I expect to see numbers in the 330+ WHP range.

I doubt the peak number for the non-IC guys will improve much as it leans out at the top end anyway. But there is something to be picked up in the mid-range though.

Chaptorial

So far so good from what i can tell. Pegs at 100psi+ when going WOT in any gear. Around 35psi at idle.

allmotor_2000

Check your fuel pump(s)... possible culprit!

ThinJim

iTrader: (3)

no, i never had one problem with mine and had about 8000 miles of use on it. i'll let you know next week about possible replacement products for the comptech riser (fpr). there is better way, just have to get my P's & Q's in order. i'll explain next week.

you've probabley noticed when under partial throttle, you feel the riser "ramp up the pressure?" I might have a smoother solution, next week.

mrsteve

iTrader: (1)

Yes, increasing the throttle by 20-25% rises the fuel pressure from 30psi to 60psi.

mrsteve

iTrader: (1)

What would I check? Some sort of clog in the filter?

ThinJim

iTrader: (3)

yes, i understand that, i'm speaking of ''feeling the ramp rate'' under partial acceleration, feels like the car has stages of power , perfectly normal, hard to describe, there's a smoother solution, i'll get back to ya soon.

BlueCLS6

No problems in 7 months / 2,ooo miles on my turbocharged application...

mrsteve

iTrader: (1)

7 months and only 2,000 miles. DRIVE YOUR CAR!!!!

Allout

No problems as far as I can tell with 5K miles. No guages monitoring boost or fuel pressure so all seat of the pants. FPR was minorly adjusted by Comptech when they checked out my install job (I was told to give optimal fuel trim value).

ThinJim

iTrader: (3)

OK, first, i'm not going to pretend i know much about the fuel delivery and the tuning of it. but after speaking with someone i beleive is in the know, it was suggested to just continue using the comptech riser, (fpr) I will be using a different setup than the comptech because i'll be using a different FI, turbo vs. SC.

As said in a previous thread, i'd check your pump, filter, to see if there is any blockage. does the problem only present itself when the tank is near empty? possible pickup problem in the tank. did you hit a bump and bang the tank? could have messed up the pickup. you do live in MD. and it's been real cold their, any water in your system?

Sorry i couldn't be of better help. the technical explanation is hard to translate to this forum and I need some hands on to better understand it. I'm still learning too. keep us posted steve.

mrsteve

iTrader: (1)

The car sits at idle just fine now. In the taller gears (4th and 5th) I see about 95psi at WOT and begins to back off to around 90psi. On the contrary, in 2nd or 3rd gear at WOT fuel pressure only reaches 88psi and then lowers to 80psi in VTEC. This baffles me. I'm not going to boost the car until I get this figured out.

Smitty suggested maybe the fuel line is covering the bleed valve on the pump.

derelict

What are supposed to be considered "normal" values for FP at idle and WOT in each gear? And I imagine it varies depending on how much boost, outside temp, etc?

mrsteve

iTrader: (1)

At idle you should see between 35-40psi. At WOT no matter what the gear is you should see 100+ and then slowly drop to 95psi.

allmotor_2000

You can still use the Comtech FPR with a turbo... just need to calibrate it differently - the universal FPR from Comptech is just like any other (if not better than) aftermarket rising-rate FPR. It comes with several calibration disks and springs. Now, the ideal way is to use a 1:1 regulator and use larger injectors to handle the extra chore due to FI. I use a combination of three... Comptech FPR + E-Manage + secondary 750cc injector.

The innate problem with a rise-rate is that fuel is either too much or too little at a given rpm vs. boost-level. The E-manage allows you to tune out most of it, but you don't want to have 90-100psi of fuel pressure under boost. At these pressures, the fuel pump (Walbro.. whatever) flows about 30%-40% of what it would normally flow at 50psi.

mrsteve

iTrader: (1)

So then even though my fuel pressure isn't being maxed out at 100psi like everyone else is, am I still potentially running too lean?

Damn I need to get that wideband hooked up ASAP!