The entire map had to be retuned as I was making most boost earlier (pulled alot of timing). There's nothing to agree to here, it's a fact.

After the final map was established on the smaller pulley, my tuner tried a couple combinations of fuel/timing to get the HP/TQ to come back up top, but nothing worked.

 

Where do you vacuum control from the Wastgaten? before or after the intercooler?
Do you take it before the intercooler to get boost declining.

 

Boost source is post aftercooler (taken where stock PCV hose routes to on manifold)

Torque Obsessed brought up a good point in my other thread

Found this formula below, which indicates that the blower may be in an inefficient range and producing less volume at higher RPMs.

Peak Airflow (lbs/min) = Power Level (hp) * Air to fuel ratio (x:1) * BSFC /60

thoughts??

 

Just caught this. Based on what you're saying and the graphs, I would say that makes sense and you've reached the limit on the blowers efficiency around that RPM. Might be tapped out.

 

First thing I would do is try to lean the air:fuel mixture out from 6500rpm and up. It may be a coincidence but your air:fuel goes fat and your power drops at the same points.

 

Something strange is happening here for a few reasons. Look at 4000 rpms. you're making another 3 psi and the power/torque is the same. Further yes its going a fair amount richer at say 8000 rpms. leaning it out isnt going to get your power back. Its an indication the engine isnt nearly as efficient. Could be because of the airflow constraints. could be the calibration. I would check over the the datalogs and make sure the ecu isnt pulling excessive timing first before anything else. adding timing wont do anything if the ecu is "thinking" its knocking.

 

Good observation. The 4000 RPM region may be optimized by moving VTEC from 4000 RPM to something else. Also, the ECU wasn't pulling timing.

 

Id have to go back and look at some of the tunes I've done similar to your setup, but just looking at the graphs you can tell vtec isnt optimized. Id start w 3800.

and further, the easiest way honestly to figure out if its the wastegate thats causing the power issue is dumping some race gas in and either removing the wastegate or putting a higher spring in it for testing purposes and run it higher. Then you will have isolated the issue and come up with a game plan from there.

 

I would have to agree if it is going much richer up top with the same boost and same fuel in the tune up top then something is less efficient here.

 

I'll update this post in 2 weeks. Need to send my ECU to Hondata to add the Boost Control pin. I will then setup the Flashpro to control boost by RPM to gradually increase/maintain boost to 12 PSI instead of purging down to 9 psi which it's doing now.

With the extra air now entering the motor, I expect see some increase in TQ & HP and better AFRs at the top end.