Turbo S50 running super rich at WOT input needed.

[BMW_TUNER]

So I am currently in the trouble shooting and shake down phase of my build and I have a few logs that I could use some input on. They are both third gear pulls. I have leak tested the entire system at 25 psi down to the smallest seep. It is OBD1 and throwing no codes. I am wondering if there is anything else I should be looking at other than the tune being super fat as a cause for the super rich condition at WOT. It is currently just a base tune from Technica.





Oh and I almost forgot. I do live at almost 5,000 ft above sea level if that helps.

[ak-]

Throw more boost at it till the AFR's are nice.

Just kidding. Base tune = safe tune, so maybe it just needs fiddling to perfect. Do they do live/remote tuning?

[BMW_TUNER]

Throw more boost at it till the AFR's are nice.

Just kidding. Base tune = safe tune, so maybe it just needs fiddling to perfect. Do they do live/remote tuning?

I have the burner so they can do revisions based off of my data then send me a revision and I can make more pulls. I am wondering if my spark plugs are tapped to tight NGK R5671A-7 (stock 4091) gapped to .018.

[ak-]

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.

[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.

[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.

[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.

[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.

[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.

[ForcedFirebird]

Where is your MAF? Blow or draw through?

[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]

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]

Aftermarket MAF that came with my Technica tuning kit.

[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.

[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.