Turbo S50 running super rich at WOT input needed.

[BMW_TUNER]

Now that I have a consistent FPR and proper scaling from what I can tell I can finally start to sort the car from a base line. 18 PSI in an E30 is insane. I am not sure how much tire I would need to put that down but I am not sure it would even fit on an e30. I put the Original baseline tune in from Bret at Technica and it is running better than even the modified tune did with the old FPR. Still seeing low 10's at WOT but I have yet to do any dyno revisions at all.

Oh and it pulls like a terrifying freight train from hell even in the 10's

[BMW_TUNER]

New FPR in and its officially terrifying.

[squidmaster]

Yep, get that FPR swapped for a new/upgraded one.

[BMW_TUNER]

I run the ngk bkr6e @.018 .020, I have a walbro e85 I think is the 450 and stock fpr, never had that issue.

Who did your tuning? It is possible to tune around the pressure but all of my tuning is remote so I am trying to keep things consistent between data logs but my baseline pressure is 125% of what the base tune wants to see.

[hyperE30]

I run the ngk bkr6e @.018 .020, I have a walbro e85 I think is the 450 and stock fpr, never had that issue.

[BMW_TUNER]

My FPR continues its rampage of inconsistency. I will be swapping it out for a real fpr and reverting to the base tune. It appears that my 21 year old FPR may just not be up to the task and may be scaling incorrectly.

[BMW_TUNER]

Aftermarket MAF that came with my Technica tuning kit.

[ForcedFirebird]

Is it a stock (or larger BMW) MAF, or an aftermarket? Tough to diagnose without knowing details, but I have a hunch the MAF is seeing over 4.7 volts and the ECU is acting up because of it.

[BMW_TUNER]

It's a blow through setup. I am currently 52-55 at idle 61 at off idle zero vacuum and with my current base pressure and 1:1 for boost at 20psi I am at 81psi.

[ForcedFirebird]

Where is your MAF? Blow or draw through?

[328ijunkie]

After speaking with the tuner and other people who have swapped larger pumps in it's pretty common to have over pressure situations with an oversized pump. They trimmed down the injector pulse on a new tune and it ran better but I still need an external FPR. Rail pressure is being measured at the inlet to the rail via a mechanical gauge. When I disconnect the vacuum hose it jumps 10psi. Then Under boost it goes 1:1 and I get far to much pressure. FPR was working fine prior to turbo swap and wasn't over driven.

You want the FPR to be 1:1 and have pressure go up with boost. this is done so that the effective fuel pressure into the manifold is the same. You have 60psi fuel pressure and 20psi boost without that you now have 40psi fuel pressure.

[BMW_TUNER]

After speaking with the tuner and other people who have swapped larger pumps in it's pretty common to have over pressure situations with an oversized pump. They trimmed down the injector pulse on a new tune and it ran better but I still need an external FPR. Rail pressure is being measured at the inlet to the rail via a mechanical gauge. When I disconnect the vacuum hose it jumps 10psi. Then Under boost it goes 1:1 and I get far to much pressure. FPR was working fine prior to turbo swap and wasn't over driven.

[ak-]

It turns out my new fuel pump is overdriving the FPR and I am seeing 10+ higher than usual so when boost comes on I am seeing like 80psi at the rail. I have a new tune from Technica that accommodates for the fuel pressure increase.

10 is actually a special number when talking about rail pressure and effective pressure because at idle, roughly 20inHg on your gauge, converts to ~9.90psi. Where/how are you measuring this?

I also agree that if it's faulty, get a proper FPR on there. Maybe test a used one. Is S50 3.5bar? I do not believe a bigger/swapped pump (if that's the case) would change the fuel pressure your mapped for.
Regulators gon' regulate.

[pazi88]

It turns out my new fuel pump is overdriving the FPR and I am seeing 10+ higher than usual so when boost comes on I am seeing like 80psi at the rail. I have a new tune from Technica that accommodates for the fuel pressure increase.

No that's not the way to do that. You will have some other problems if your fuel pressure is not stable. Just upgrade to better fuel pressure regulator.

[BMW_TUNER]

Is purple AFR? The graphs you uploaded are pretty fuzzy so it's hard to make anything out, but how rich are you under boost/full boost?

Does the 7 at the end of R5671A-7 mean it's heat range? If so, that's probably the best you can use on these 24v turbo motors.
I'd make sure they aren't fouled, put the gap at .020, raise the boost by a pound if your AFR's are under 11, and send them the log. 0.018 is as small as you should go on the plug's gap.

It turns out my new fuel pump is overdriving the FPR and I am seeing 10+ higher than usual so when boost comes on I am seeing like 80psi at the rail. I have a new tune from Technica that accommodates for the fuel pressure increase.