Okay, I just looked at Yenko's new datalog. In the old datalog starting from 4800-RPM and going up to 5300 RPM's, his boost pressure hit 5-psi at 4800-RPM and his duty cycle was at 65%, then boost pressure lowered to 4-psi as RPM's increases and duty cycle reached 69%, but then boost pressure lowered to 3-psi and stayed at 65% until he let off at around 5300-RPM...

The new datalog I am looking at starting from the same 4800-RPM shows 5-psi of boost pressure at the same 65% duty cycle, 5.5-psi of boost pressure at 68% duty cycle at 5100-RPM, and then finally 6-psi of boost pressure at 75% duty cycle at 5300-RPM. From here, duty cycle continues to increase all the way up 80% duty cycle at the same 6-psi of boost pressure at a 5850-RPM peak...

Same wideband air/fuel being commanded, WUD is showing 11.7-12.0 the whole time...

He wasn't losing boost with the bad tune, engine was holding back...

Datalog looks great Yenko, well done...

 

Dig, when looking at the old tune, it looks like the engine didn't want to rev when boost pressure started to decrease, it was holding back at that point, so he let off at 5300-RPM and went no higher. The new tune he went as high as 5850-RPM, he probably could have spun it higher but pulled off the throttle to verify his tuning...

 

That is what we would expect with a centri blown car.

Looks good now and should be making power. Keep working with it. Timing was low before so lots of power left in it now that you are seeing boost whole way thru rpm band

 

Stock lower...7.62 I believe??

 

Yea should make some killer power..... actually would think more than 8lbs with those pulleys.....

 

I was hoping for about 8 with this pulley. I pulled it to about 5600-5800rpms just to verify the boost was there and start checking plugs for detonation and fueling. The plugs look hot and there was a slight look of detonation running 27-28 degrees of timing with a leaner A/F ration 11.4-10.8 on that pass with PW being about 8.6-9.0. I've leaned it out some more and will post back numbers. Seems like the truck pulled harder on 25-26 which would make since if I'm getting detonation. I still would anticipate the boost to rise a little more though as it looks to me like it flat lines from about 5300-5800 at 6 psi and should be rising a little bit more I would think in that 500 rpms. The engine still is not running right but I'm going to pull plugs and regap to .030 or maybe .028 from .032 and go from the DynaMod back to the 369 module as the spark latency table is set up for the 369 and there is no information on the DynaMod so it may be off a bit.

N/A, the truck felt the best shifting about 6300-6400 rpms peaking about 5900-6000. I would anticipate the supercharger to extend the power band a little bit.

Just some information, I tune the top end from a 300' stretch of road between two markers. I start at 60 and go. N/A, I could trap about 96-98 mph(4L80e, 4.30s, 29.5" tire). Right now, only trapping about 102...I expected it closer to 108-114 in that range with the level of power I should have. So, like y'all have said, most of it is still in the tune that needs to be worked out but some I feel like is in the engine whether is it module, spark plug gap, heat range of the plugs, etc.

The engine is build based on AFRs 383 530hp version with some changes that Tony Mamo recommended back in 2007 when the Eliminators came out. It has a point more of compression, a slight bigger cam(4 more degrees of duration and .050 more lift), and a single plane intake Victor Jr ported to match the 195cc. So, if I built it the same plus some better things, then I would say it was at least 530hp. I maxed out my 38 lb/hr injectors on the engine running 30 degrees of timing which according to the math would confirm my hp estimates on engine alone (never had it on a dyno). I had to up the pressure and upgrade to the Super AUJP to get it through. Basically making the 38s be a 42.

 

I would think a 7 plug would be fine for that setup but 8 would be safer. Coldest that still works without fouling seems best. I run 8's to 28 psi boost so far no issues i can see. If it gets rich they foul easy tho but i am low compression with big heads and cam that really dont start making steam til 5000 rpm