[Choda]

absolutely love it. You're the needle mover once again. This will drop the 6.2 prices and raise the 5.3. Congrats on the consistent 5s. That pass looked so smooth and effortless. You need some in cars and random videos of the whole car. You really have done a lot of misc first time crap with this that i think a lot of people dont know about.

Can you please post the log of the pass, I would like to see the boost by mph ramp in.

[wolfdog]

Wow man!...extremely impressive. I think you have sold me on the 5.3. I see this as the new "LS" replacement going forward.

Excellent build, numbers, and info!

[parish8]

I think where I am at power wise doesn’t prove a lot. 1000hp from a 5.3 with rods and pistons seems safe and some guys with the trucks have done it all ready. The questions I see going forward is how far will a 100% stock motor go and how far will a mild build like what I have go.

Like times in the past it is hard to know if this motor is being pushed or not. I suspect with the better than stock parts I have that it is good for another 10psi(200+hp) possibly a lot more.

I am thinking about learning how to run a consistent 6.50(with a good reaction time) and entering some 6.50 races and then in the fall turn it up another 200hp or so.

I have a lot of data. I will post up some screen shots. I can email logs if anyone wants to look closer.

[laynlo15]

Parish that sounds like a good idea.

[parish8]

I have the afr dialed in a little better since this log. A couple of things I need to work on is running it out in 4th, it is shifting a bit early and I want to try locking the converter at least in the last gear.

After that it is just more boost.

[wolfdog]

Jeez that data is beautiful! id like to see your tune file lol...

so youre running SD?

what did you do for SOI tables? right at IVO? or before?

[parish8]

Originally Posted by wolfdog

Jeez that data is beautiful!

so youre running SD?

id like to see your tune file lol...

what did you do for SOI tables? right at IVO? or before?

Yes SD only. The maf can handle a ton of airflow but the way my car is set up it would be seeing 400deg air and I didn't know if it could handle that.

I don't remember. I haven't messed with those settings in awhile. I have the lt4 hpfp and the lt4 high pressure fuel injectors and I am 90% sure I just copied the lt4 data over for the soi tables.

The tune would probably look pretty messy. Lots of stuff I don't use so I didn't mess with it. The ms3 tune is a lot more interesting if you have tuner studios and want to check that out.

I had a rich area above 7400 that was hard to figure out and I noticed the vve only want to 7400 so i extended the axis on that table and played with the numbers up there and it seemed to get rid of the rich spike up there. To be honest I am not exactly sure what all I did but when I got done it was no loner rich right there and the pw dropped a little. the map feeding the stock ecm is maxed so that part of the tune shouldn't change as I add more boost. I think it will work out well.

[parish8]

My dyno chart is pretty wavy. I am trying to figure that out. I think I am being too conservative with my timing.

[wolfdog]

Im a total noob at tuning but...maybe apply some horizontal smoothing/interpolation around 6500...i see more than 5deg jump between cells.


If you dont mind...I'll take you up on that ms3 file...just loaded up the lite version...i think i can look at files.

stephen.lamx@gmail.com

[parish8]

Originally Posted by wolfdog

Im a total noob at tuning but...maybe apply some horizontal smoothing/interpolation around 6500...i see more than 5deg jump between cells.


If you dont mind...I'll take you up on that ms3 file...just loaded up the lite version...i think i can look at files.

stephen.lamx@gmail.com

Yeah it could use a little smoothing down low. I am mainly sweating the 150kpa+ timing.

[parish8]

Seems I am approaching a wall. The labels on the left are peek hp but you can’t see what they are referencing. Just know the 1st row compares the lowest hp run to the 2nd lowest, the 2nd row compares the 2nd lowest to the 3rd lowest... then starts over at the higher rpm.

I am thinking turbines or air filters. I am going to pull the air filters next time

[parish8]

I tried a pair of these over priced turbo guards. I also tried no filter or guard. I had the exact same results. It just isn’t happy over 1000hp. Great gains in the 15-20psi range but above that it tapers off quickly.

Right now I am thinking cam selection or valve train control is holding me back. It could be the compressors are done but they are 67’s and rated at 900+each so that seems unlikely. The small t3 exhaust housings seem like a possible issue but the current pre turbine exhaust pressure is still low I think. I did check my sensor compared to a manual gauge and the readings are correct. Ignition maybe, I narrowed the gap to .017 and bumped the swell.

I have some other stuff going on so I might just have be happy with this power level for now.

[gtfoxy]

Excellent, yet I’m sure very limited, data posted.

Studying with interest.

Add: Are the ports stock? I’ll go back & study your turbine mapping, but if that, along with your Pre-turbine pressure isn’t showing a restriction I’d lean towards the exhaust port flow. You are bound to hit a wall sooner or later, regardless of valve curtain, due to simply being able to get the exhaust out of the cylinders.

That’s what piezoelectric sensors would show. Cylinder pressure BEVO through residual cylinder pressure AEVC. This is, invariably, cyclical. Meaning it effects chamber dilution as well air charge influxion.

If I may with a simple analogy; back in the day I found the limit of exhaust port flow on a stock 5.0L head of stock engine +175shot of nitrous. I could add more nitrous but it didn’t make any more power. Modified the heads with 1.60” exhaust valves & a good port & the new cap was above a 275HP shot before it wouldn’t go any faster.

[laynlo15]

Some great numbers for a 5.3, you just keep tinkering it seems to be working.