13+ psi on c30 kraftwerks kit? Should I be worried?
 

So I'm running a c30 Kraftwerks kit with standard 30mm pulley set and tune by Delicious. I noticed on my original logs that I'm hitting .7 bar measured through Ecutek Manifold Gauge pressure around 6500 rpm. Then .8 bar at 6900 rpm, .9 bar at 7150.


From my math that's more than the 9 psi the kit should be putting out. Should I be worried? AFR is in a plenty safe range. I'm only running 91 octane so do I need to control boost amount?

Do you have a datalog?

I run e85 on my Harrop kit, but I have run 12 psi on pump. It isn’t ideal, but Delicious would have said if it was sketchy. I don’t know what psi you should be making, but every kit and car will be slightly different.

First log has the manifold gauge pressure setting logged but only ran up to about 7300 rpm.



https://datazap.me/u/dh318xgmailcom/...?log=0&data=30


Second one is up to around 7500 rpm. I forgot to select manifold gauge pressure, but if you look at manifold absolute pressure, it's basically the same as the previous log.



https://datazap.me/u/dh318xgmailcom/...og=0&data=8-30


My biggest issue is that the pulley size should determine boost amount right? What kind of control do I have over boost that is strictly determined by pulley size?



I'll be in contact with Delicious a little more for suggestions as well.

Oh man is that going to 14.7 afr after 7200 RPM and max boost??

I think the boost going above the 9psi is probably what's causing the ratio to lean out? Honestly this is my first rodeo going over log data, so at first that seemed like a good number.

Looks to me like it's dropping to stock AFR as soon as it passes a certain AFR. I would stop doing this until you speak to tuner, or have they seen these logs? You're basically running 14.7 AFR at 13+ PSI boost over 7200rpm ;o

P.S: I'm not a tuner, just observing, I could be very wrong

I was told by DT that my duty cycle was maxing out at 12psi. I know other tuners use more of the direct injectors, but DT doesn’t for their reasons, so I decided to upgrade the injectors. I did the pump too just because I knew I would do E85 eventually.

Look at the direct vs port injectors. The direct stay flat, but the port goes up to 17. That is probably too much.

https://datazap.me/u/dh318xgmailcom/...ata=8-30-37-38

Here was mine with stock injectors. As you can see, I was maxing out my duty cycle at 27.4 ms on my port injectors:

https://datazap.me/u/jirace/85mm-pul...23-24-29-36-37

Here was wine with 700cc injectors. Big difference in duty cycle:

https://datazap.me/u/jirace/v8-flex-...23-24-29-36-37

Here is yours. The direct injectors seem to be on 0.5 ms more than mine, which is probably why the port isn't as high as mine:

https://datazap.me/u/dh318xgmailcom/...24-25-30-37-38

I thought standard pulley put out 9psi but that 30mm pulley was a high boost upgrade adding 3+psi. Your log shows about 12.5psi at 7400rpm (normal redline) which should be normal boost for 30mm pulley, however i also see you revving up to exactly 7600rpm (new rev limit). Also right after 7250rpm AFR swings way too lean. So stop going over 7200rpm till resolved.

Is this the final tune revision from tuner or a starting base map? Either way send those logs to him because your going to blow your engine soon that lean, at that boost, and that high rpm is a recipe for disaster.

Off boost you want an AFR closer to 14.7 and on boost closer to 11-12. You could make more power at 14 on boost, but it is dangerous because there is a greater chance of knock on a leaner mixture, and because the extra fuel at 11-12 psi acts to keep the chamber cooler.

Pulley size should determine boost and the other components in the system. Any restrictions could increase boost and the opposite, so often people may find that manifold pressure drops with heat or after the install of some headers.

Also, I just noticed you said 30mm pulley. 30mm is the belt/pulley width. The base kit comes with a 95mm (9psi) pulley. Please confirm that the pulley says 95mm. Was this a new kit or a used kit? I am guessing you have a 90mm pulley and not the 95mm pulley.

Doesn t look like a super quality tune to me, but who am I to judge Delicious

Maf not scaled good, a preset Speed density that engages at 4k rpm, probably same for every single car they tunes to save time and that put the engine load out of whack
super rich afr with low ign timing at low rpm (i imagine they would say that s for LSPI :) ) that turn super lean suddenly.. who cares when there is Ecutek closed loop fuel control ssving you time right?

Your PI is maxing out while you have still headroom in your DI.. but you know, it takes time to tune, probably your money weren t enough for them to tune you right

Lot of cam overlap in high rpm... do you have a Cat in your header, or they tune the same vvt timing in every single car?

Anyway yes, you should be worried. 91oct is too shitty for this kind of boost on a stock engine
I suggest you to stay lower than 7100/7200 rpm maximum with that fuel and that boost at high rpm, when it s cold outside

ok that you need the big injectors for E85/flex, but with petrol, that would totally be doable with stock inejctors, but your tuner like to maximize PI over its maximum, instead of use properly the DI and maximize that :)

I guess it s easier to say "buy big injectors" than spend time to properly scale everything.

Stick it on dyno and tune it properly.

I'm far from being an expert with the black magic of tuning, but to my "unskilled" eyes it looks rubbish.