nj1266

iTrader: (6)

First, set the solenoid base WGDC at 100% when the throttle is at 70 and 80%. Add 2-3% WGDC to your passive solenoid from 4000 to 5000 rpm. Log and post the results.

Only log the following:

wideband
Mode23RPM
Mode23PSIG
Mode23TimingAdv
Mode23KnockSum
Mode23Load
Mode23TPS
Mode23ActiveWGDC
Mode23PassiveWGDC

This will make your logger faster.

pltek

iTrader: (33)

cobb dp, stock cat and rest of exhaust
works air filter

pltek

iTrader: (33)

i have already done this and all i get is higher peak psi spike, drop and boost recovers so picture the same boost curve just add couple of psi

also my fuel cut is set to 270 dropping off at around 250 so i am not hitting that, with boost cut delay of 3 seconds

LaXGSR

Try this: Reduce your passive WGDC at 5500 rpms, and keep it steady at 5000 and 6000. For example, with your current map, set it to:

5000 rpm = 60.5
5500 rpm = 55
6000 rpm = 60.5

Then smooth it out from 6500-7000. I would personally set passive WGDC to 0 at 7500 and 8000. Also, make sure to change all 3 tables. That will help with the spike between 5000-6000. If it doesn't help enough, try lowering the passive WGDC at 5500 rpms a little more.

Also, with the conservative tune you are running, I would put back the stock boost limits and boost cut delay timers. I don't think you should be hitting it. Just make sure your boost target engine load table is in line (maybe just slightly higher than) the loads you are hitting.


EDIT: Your AFR's seem a little lean during spool up. You hit 18 psi and still run 13:1 or higher AFR. Maybe someone else could comment on this.

pltek

iTrader: (33)

lean spool

no knock really

LaXGSR

So if there is no knock, it's ok to run as lean as 13:1 at 18 psi without worrying? The reason I ask is because I've done a lot of work in richening the spool up in order to run 12.5:1 up to 10 psi, tapering down to 11.5:1 at full boost, and down to 11:1 by redline. This was what others have suggested is safe to go with, so I'm curious to hear your thoughts. Is EGT a concern when running high boost and lean AFR?

pltek

iTrader: (33)

i am no expert at this, since this is a wot pull in 3rd gear from about 3500rpms, the transition from stoich to about 11:1 arf is very quick in my case.

i will log some part throttle conditions where i am sitting at various levels of boost to see what my true afrs are there

there could also be a delay capturing the true afr in the logging application or sensor issue, who knows

goofygrin

iTrader: (5)

start your pulls lower than 3500 rpm... like 2k.

pltek

iTrader: (33)

i just did, the friggin boost doesnt spike anymore

still got the dip but will play with passive wgdc

LaXGSR

Did you ever figure out the best way to smooth out the boost curve? Also, does anyone know if it's more important to have a smooth boost/load curve, or a smooth power curve? Using the VDR excel spreadsheet, I can see how the power curve flattens out a bit between 4500-5500 rpm's, then goes back up. This is the same area where the boost drops off quickly because I had to reduce the passive WGDC in order to avoid boost spikes.

pltek

iTrader: (33)

i am currently thinking of opening my exhaust a bit and then see how that will effect the boost drop on my current map, i might play with boost pill a bit too but thats later

pltek

iTrader: (33)

so i added a 100 cell hfc but still running stock catback (only other power mod is works air filter and cobb turbo inlet hose)
- reverted the boost target engine load to almost stock (smoothed out the 70 and 80 tps settings) and i am still getting the boost spike and then drop and then receovery.
- can someone look at my latest log and map file and help me to understand how i can tweak my boost settings to smooth out the curve.

http://www.pltek.net/map.hex

http://www.pltek.net/log.xls

spdracerut

iTrader: (2)

In general, opening up the exhaust/reducing back pressure will cause the boost to increase. I think....

Anyways, as for the spiking, does the X ecu have a table for boost correction factor? On my VIII, the stock calibration allowed for like 20% of adjustment to the wastegate duty cycle, which caused the boost to be vary wavey as the ecu would try to hit a load, overshoot, and try to readjust, all too slowly. By taking down the range of correction factor to almost 0, it really smoothed things out as the ecu basically just ran whatever duty cycle you had in the tables.

pltek

iTrader: (33)

i noticed that i am hitting about an additional 1psi of boost with the hfc. i will try to 0 out the boost error correction in the lower % cells to see if that will smooth out this drop.

thanks

coevolve

We have a map for Reactive Solenoid Boost Error Correction based on load error(load) vs % (+5% or -10%)

GST post from evoxforums:

That particular map looks to be the same in both the 8/9 and the X