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Yes, the fuel system is boost referenced. Its one that The Dub Shop sells with an interchangeable Bosch 43.5psi regulator.

FWIW, the engine was running fine just a couple months ago.

Well, looks like The Dub Shop FPR failed. Checked the 1/8 NPT gauge with another FPR, works as intended. Although the cheap FPR I tested with read exactly 43.5psi, where the one I had on TDS FPR is reading 50psi... Wonder which one is correct?? Gotta get an ECU that will read fuel pressure, I don't trust these gauges.

Can you get a pressure transducer in that FPR distribution block ? Then your ECU can read it maybe ?

Fuel pressure regulators are pretty well bullet proof. My stock Geman FPR has been flawless foe almost 50,000 miles... And it was used when I installed it.
The one Mario sells is a very well known unit so if it failed, I would give him a call or email and I'm sure he would have a satisfactory answer for you.

I have a couple stock german spares if you need one... I can send you one if needed.

Thanks for the input guys. I didn't reach out to Mario, I simply bought another Bosch FPR from TDS. Thanks for the offer Clonebug.

I think, probably in the near future, I will be switching to a different ECU. I like speeduino, how I'm able to use Tuner Studio, but feel lost sometimes with initial setup and tuning. I like auto tune, as it takes me out of the loop... But getting to the point where auto tune takes over seems to be my problem. Having random issues seems to keep me off the road. I feel like I need a more solid ECU, one that is looking at more variables and letting me know I have a problem and where to look. I donno, just frustrated. Have a beautiful car sitting in the garage collecting dust. Sometimes I wish I didn't go EFI, but am far beyond going back at this point. Hopefully the new FPR will be the fix once and for all and get me on the road finally.

Is there no 1 in your neighorhood that can help you tune the car and set a base setting?

I live in belgium and that´s a verry small country, but i know of 3 dyno shops in a 50km radius.



Verstuurd vanaf mijn SM-A528B met Tapatalk

I’m with you on the challenges.

I’ve had a few “back a step” issues recently but I’ve just reconciled it with myself because I’m largely prototyping a unique solution.

I had to pull the engine last weekend to sort a nasty oil leak & replace the clutch, just as I was getting into the tuning process. I can see the tuning being a steep learning curve but it’s the sort of puzzle that I enjoy.

Bruce! Thanks, that was what I needed to hear... Someone else having struggles with oil leaks, fires and other issues associated with an engine build. I can see the light at the end of the tunnel, I'm sooo close. These are just minor bumps in the road. As soon as they are worked out, more work is going to go towards my proof-of-concept setup. All good things coming, just gotta stay engaged.

panel wrote: ↑Sat Jun 24, 2023 7:52 pm Can you get a pressure transducer in that FPR distribution block ? Then your ECU can read it maybe ?

I don't think I can unfortunately.

rubenski wrote: ↑Mon Jun 26, 2023 9:27 am Is there no 1 in your neighorhood that can help you tune the car and set a base setting?

I live in belgium and that´s a verry small country, but i know of 3 dyno shops in a 50km radius.

Verstuurd vanaf mijn SM-A528B met Tapatalk

There is a Dyno shop about 45 miles away. Haven't contacted them to ask if they are TS/Speeduino savy, I suppose I could. I can try asking for help on Facebook I suppose, maybe I could find someone local. By the time I'm calling it a day, Mick is just starting his. He has been tons of help, just wish we were closer.

Received and installed the new Bosch FPR from TDS... Reading 40+/-psi while priming. Back in business. Had a quick inspection of the bad one. No debris or bad o-rings, nothing out of the ordinary? But, gonna have to wait a couple weeks. 4th of July bash, uncle's Celebration of Life, etc... Always something. Wanna tune/drive this thing sooo bad. Ugh.

Decided to take a step back and tackle an ongoing problem... Trigger loss. When I had my pulley machined for the trigger wheel, the machinist (not an expert, a buddy with a lathe) dug a bit too deep. The trigger wheel fit perfectly, but was recessed deeper than I had asked. Since installing it, I've had nothing but problems getting a solid signal. Modified Joeblow's bracket, no change. Fabricated my own sensor bracket, better, but still have loss while running. Mick recommended using gasket material to make a spacer. Used some .016 gasket material and traced the trigger wheel making a spacer. Now the trigger wheel sits more flush on the pulley, allowing the sensor to be positioned safely closer than before. Put everything back together and cranked the motor a few times (injectors disconnected). Cranked the motor until I saw a signal in TS a few times, still have the uniform wave (caused by compression I think) with the missing tooth. Probably tried 5 or 6 times, only 1 trigger loss during all that. I think this may have solved my problem finally. Gonna wait until the weather cools off a bit (115°F yesterday) before attempting to start the engine.

Still waiting for the temperatures to come down... 106°F today. Actually started her up on Saturday morning after installing an oil pressure gauge next to the pressure dummy light sender. Certainly not just starting right up... Turns over many times before finally stumbling to life. Since receiving my ECU back from Joeblow, I can't help but notice the engine is wanting twice as much fuel?? This is also strangely right after the FPR was replaced too. Needless to say my VE table is jacked up. My VE table prior to the ECU/FPR issues, at idle, the table fuel QTY was in the 50's. Now the idle fuel QTY is around 105. Should I back track and double check all the basics? Trigger angle, air leaks, etc?? Can't seem to get to the point of simply driving this car and having fun with it. Very frustrating. This being a Speeduino ECU, it doesn't have an input (to my knowledge) for a fuel pressure sender. Just ordered an AN fitting to install an in-line gauge for fuel pressure. The engine is pulling 10psi of vacuum at idle... Would I necessarily see 43.5psi at the fuel rail??

Maybe check all the basic settings for injector flow rate, engine capacity etc are still correct.
The VE value is based off the theoretical pulse time needed to supply a full capacity of air with the matching fuel volume. If the set fuel flow doesn’t match the actual flow, you end up compensating with unrealistic VE numbers.

For example my peak VE is well over 100 which is nonsense in my stock cam engine and the high value is compensating for errors in other settings, or limitations in the calculation.

Thanks for the reply Bruce! I checked and verified the injector voltage correction values, they looked ok. I think I verified the engine constants, but will double check. While idling, the AFR seems ok, around 13.5 or so. Is there a way to create a new VE table using the 105 at idle as a base for the table?? Still very new to Tuner Studio.