S54 Dyno Database

[stash1]

Hey Anri, very nice results for a budget build! Is this on a DJ? Sooo, no cams? Which airbox is that?

[Anri]

Stash,

I know its not an E46M3 but please allow me to share what I achieved
with the S54 Love.

- Intake and Exhaust camshafts.
- CSL Box
- "Budget" headers they are not really equal length....(measured them)
- Crappy California 91 Octane gas.

My concentration on the power was to dial the Mid-Range torque were we
need the "kick"

The camshaft timing brought the pick hp around 7650-ish so that it comes
little earlier and keeps it flat to about 8150rpm and rev limiter is 8200+/- rpm.

There is another 5rwhp with little tweak but no need to push the ticket on
91 Cali gas..

Chilled passes like 3-4mins between runs
353.8 rwhp
265.1 rwtq

Hot passes one after each other.
348.5 rwhp.
259.1 rwtq

Regards,
Anri

https://www.youtube.com/watch?v=t_W05pmpvkI

[Slideways]

Evolve has been responsive but the tune is a PIA. Always new versions of the tuner software and the biggest is I can’t hook up to ISTA because the tune is locked or something.

Yeah, planning on going with Paul.


Sent from my iPhone using Tapatalk

Ya, sometimes it's worth taking the loss and moving on. Similar situation to those that had TTFS.

[bigjae46]

Jae, lose the current Evolve tune, get an airbox and contact Paul

Evolve has been responsive but the tune is a PIA. Always new versions of the tuner software and the biggest is I can’t hook up to ISTA because the tune is locked or something.

Yeah, planning on going with Paul.


Sent from my iPhone using Tapatalk

[Slideways]

Figured as much because of the headers.


Sent from my iPhone using Tapatalk

Jae, lose the current Evolve tune, get an airbox and contact Paul

[paulclaude]

Figured as much because of the headers.


Sent from my iPhone using Tapatalk

In my experience, catless headers shouldn't lean it out as much as that - either way, correct tuning should lift that whole curve nicely

[paulclaude]

IMO it looks partly real it is present in the baseline albeit worse and there are some small dips associated. It'd need to be a pretty amateur tailpipe setup to be contaminating the reading

I would agree it is real - you can see similar in graphs above. A lot of the problem when trying to dial out AFR swings at lower RPMs is the tailpipe wideband feedback tends to have some delay due to the slower exhaust gas speeds, so indicated RPM on the graph tends to be a little out of whack. That brings in a little trial and error as to what map RPM axis value to target, so along with dyno time constraints, it's often hard to clean everything up as you would want it, especially when primary focus is normally on that top figure

[bigjae46]

That engine is running far too lean overall, and the power loss at 5-5.5k looks to be due to the even leaner spot, which will most likely be triggering knock and resulting ignition reduction. Needs more fuel everywhere, for starters

Figured as much because of the headers.


Sent from my iPhone using Tapatalk

[digger]

Looked like a delayed signal from the muffler mounted Wideband sensor. Also from the logs most of the runs the operator wasn't going wot before 3k rpm

IMO it looks partly real it is present in the baseline albeit worse and there are some small dips associated. It'd need to be a pretty amateur tailpipe setup to be contaminating the reading

[paulclaude]

Ok...need some help. I'll make it simple...WTF is going on with this mess? lol

I'm getting the car ready for 2020, this is the last thing I need to sort out.

I'm running a canned Evolve Stage 1 tune that does not account for the headers. Only hardware mods are megan headers, BW exhaust, Injen intake, and no AC (if that matters). The head was reworked about 1 year before this - cleaned, leak checked, and new stem seals. The head was checked for flatness...no material was removed. I've replaced the O2 sensors, spark plugs are relatively fresh, and VANOS gone through.

I can feel the power loss at 5k-5.5k which is where I'm usually at when getting on the throttle after turn in.

Thoughts? I'm thinking the ECU is pulling timing because of the headers?

That engine is running far too lean overall, and the power loss at 5-5.5k looks to be due to the even leaner spot, which will most likely be triggering knock and resulting ignition reduction. Needs more fuel everywhere, for starters

[bigjae46]

Ok...need some help. I'll make it simple...WTF is going on with this mess? lol

I'm getting the car ready for 2020, this is the last thing I need to sort out.

I'm running a canned Evolve Stage 1 tune that does not account for the headers. Only hardware mods are megan headers, BW exhaust, Injen intake, and no AC (if that matters). The head was reworked about 1 year before this - cleaned, leak checked, and new stem seals. The head was checked for flatness...no material was removed. I've replaced the O2 sensors, spark plugs are relatively fresh, and VANOS gone through.

I can feel the power loss at 5k-5.5k which is where I'm usually at when getting on the throttle after turn in.

Thoughts? I'm thinking the ECU is pulling timing because of the headers?

[CrisSilberGrau]

^^^Thanx for the detailed post, and very nice results—congrats!

Thank you kind sir, hopefully the S54 gods will smile upon me for many more years to come of blissful ownership and minimal maintenance.

[HassanEido]

Looked like a delayed signal from the muffler mounted Wideband sensor. Also from the logs most of the runs the operator wasn't going wot before 3k rpm

[digger]

whats going on with the AFR below 3,500rpm?

[stash1]

^^^Thanx for the detailed post, and very nice results—congrats!