Drewster67

Can anyone reccomend a particular AFPR suited for a 928? Sources and will it need an adapter of some sort?

TIA!

hacker-pschorr

See this one from 928 Specialists:

http://www.928gt.com/p-400-adjustabl...tor-80-87.aspx

The base is the same as a stock unit with an adjustable diaphragm on the other end.

Do the EuroS cars have dual FPR's like the L-Jet cars? If so, most people replace one of the regulators with an S4 dampener versus running two regulators.

Drewster67

Thanks for the link - I checked 928Intl and 928 motorsports but overlooked 928Specialist. The 928Spec AFPR looks identical to 928 motorsports but @ 1/2 the cost.

Dual FPR - Yes, the Euro S does have two. So I will need to replace one FPR with an AFPR then replace the second with the Fuel Pressure Dampner.

Thanks again for the link - Ill contact 928 Specialist to check on availability and shipping.

928mac

As james points out below this is the wrong reg that I posted. please ignore.

I may go this way drew but have not decided yet.

Jegs is quality as far as I know, Im just checking for chrome

http://www.jegs.com/i/JEGS-Performan...15908/10002/-1

123quattro

I have the Aeromotive equivalent of that on my car. I T-ed the supply line and ran directly to each rail. The outlets of both rails are T-ed back together and pass through the regulator. I have no damper. They aren't really necessary, ever.

Drewster67

Do you have any pictures of your setup?

Thanks !

Drewster67

Ill keep this one in mind as well, Thanks.

tv

I have 2 of the 928 specialists ones on my 85 euro. I like them, tighten up the fittings good and they really need to be dialed in on a dyno along with the MAF screw adjustment to get things just right.

hacker-pschorr

I'm sure that's a find unit, but I'd be hard pressed to stray from OEM quality Bosch unless I needed something with higher output or something different with the adjustment range.

James Bailey

The JEGS unit is for dropping pressure to feed into carbs...."Adjustable outlet pressure from 5-12 PSI with a maximum inlet pressure of 20 PSI. Made in USA ......" pretty much useless on a high pressure fuel injection system......

Landseer

Some of the links have expired, but Post 13 in this thread shows the unit that I've inherited along with Jim's 84 Euro
The wire running out of the unit is a sensor for an electronic fuel pressure gauge.
He used that gauge and a wide band O2 sensor to improve his set-up.
If you need more information (pictures), let me know, the car is getting some maintenance work done and the fuel regulator is disconnected and visible

https://rennlist.com/forums/928-foru...ing-sizes.html

John Speake

A rebuilt MAF is the first essential to get a Euro S2 running corectly. Make sure the injectors are flowing correctly, an ultrasonic clean often helps (did on my S2). I don't think you need to up the fuel pressure unless the car is very heavily modified.

Otherwise fitting adjustable FPR is a waste of time and money, in my opinion.

Drewster67

The enfine itself has not been modified. Stock Everything except for the Custom Cold Air Intake and MSDS headers. Bolts ons include Magnaflow X Pipe, 2 into 1 exhaust (2.5-3.0) w/a FlwMstr 2 chamber muffler w/3" tip (no cats). No smog pump with a mechanical fan delete. Cars runs perfectly - no issues with MAF or Injectors. Im just looking to tap some more power if possible. From what I researched, the AFPR set up can yield more hp with my set up. The idea is to have them installed, take it to the dyno and have it tuned.

Thanks

Landseer

Jim's effort definitely started with a rebuilt MAF.
John upgraded the 84 electronics. Not sure how that applies to your situation.

The wide band sensor was needed -- you have to measure the effect on stoichiometry

Basically, all Jim did was raise fuel pressure about 5 lbs to trick the car a bit into burning another mixture which made sense to him at high rpms..

Not sure, 30K miles later, and for my lighter driving style if its the right pressure anymore.

Tampa 928s

I have been reading this thread and from what I read is that my 86 32-V and 85 16-V Euro both have 2 fuel pressure regulators. I have changed out the Bosch on the drivers side on the S/C 32-V with an adjustable; one seems like I only did 1/2 of the job.