[Z OH 6]

Originally Posted by KingLT1

The stock supercharger needs all the help it can get. Op might not be fully "utilizing" it's potential but it's not hurting anything in this case. Disregard the dyno numbers but let's compare the power curve vs a stock blower. A little softer on the bottom with more up top. Look at any stock blower build and it's usually peak torque right on the hit and starts to taper. I would rather have the former for traction...especially on a A10 car with short tires.

14.7psi with only a 2.3 on stock lower tells me efficiency improved and boost temps will be cooler since it is making more boost with less blower speed. That is what it all boils down to. Efficiency is how much air can be moved with X amount of rotor rpm. That is why I provided the example I did in my last post. Standard port 2.17 pulley making 13.7psi is not as efficient as this X port making 14.7 psi with 2.3 pulley. Not saying there is anything wrong with standard port just making a observation after looking at the data.



15 means its running close to stoich before entering PE mode which is normal. It looks rich based on the graph showing 11's. Wideband's will also read different when placed different. I prefer to target .82 on LT1 and slightly leaner on LT4 .83-.84 with the wideband placed in front of the cat. Tail pipe AFR reading is likely going to be different. Not sure if there is a correction file for that or not. I just street tune with HPtuners...never operated a dyno.

True, I never said it was hurting anything, it's just not performing to its potential either. OP said he wants to keep modding in which case it was wise to pay for X-port now instead of later.

[synolimit]

Originally Posted by JasonD

Brian Turner of Dyno Tune Motorsports in Columbus, Ohio did the tuning. Drove it for a bit yesterday. Comparing runs from the PDR, it’s one second faster 60-120mph. 5.2 vs 6.2. Don’t know if that’s good or bad, but that’s what it did?

what made you pick him? im from cbus and never heard of this guy. and whats the difference with all this porting? standard vs x vs anything else?

[KingLT1]

Originally Posted by Z OH 6

True, I never said it was hurting anything, it's just not performing to its potential either. OP said he wants to keep modding in which case it was wise to pay for X-port now instead of later.

[JasonD]

Originally Posted by synolimit

what made you pick him? im from cbus and never heard of this guy. and whats the difference with all this porting? standard vs x vs anything else?

I live about two hours east of cbus. I was recommended a shop close to my house, shadyside auto. I stopped and talked to the owner a couple months ago before doing my mods. I decided to let them tune it. I wasn’t familiar with Brian beforehand. He’s friends with the owner and comes over for a day or two when they have cars lined up for tuning. Brian said he’s been tuning for 20+ years.

As for the port work, the Kong x port is supposed to shine when spinning the blower faster versus their standard port work. I don’t know what other porters are offering?

[JSH]

Originally Posted by JasonD

Mods include regular roto fab, 103 throttle body, Kong x-port, 2.3” upper pulley, 1 7/8” headers. Made 644/614 at the wheel. Boost went from 8psi at 2.5k rpm to 14.7 at 6.5k rpm. Is this a function of the x-port work? I thought these blowers typically produce a flat boost curve? I have no baseline pull. A stock, manual zl1 produced 540whp on this dyno, I’m told. My car is an auto.

So you've gained around 100 hp on 93 octane over a stock ZL1, which is pretty good. Your build is begging for a custom valve train, but you already knew that.

[hawk02]

Originally Posted by synolimit

what made you pick him? im from cbus and never heard of this guy. and whats the difference with all this porting? standard vs x vs anything else?

Brian Turner tunes a lot of cars in the Central Ohio area so he gets mentioned a lot by area car enthusiasts. He dyno-tuned my 2013 ZL1. Is he one the best tuners out there? That can be debated.

[JSH]

Originally Posted by JasonD

Mods include regular roto fab, 103 throttle body, Kong x-port, 2.3” upper pulley, 1 7/8” headers. Made 644/614 at the wheel. Boost went from 8psi at 2.5k rpm to 14.7 at 6.5k rpm. Is this a function of the x-port work? I thought these blowers typically produce a flat boost curve? I have no baseline pull. A stock, manual zl1 produced 540whp on this dyno, I’m told. My car is an auto.

Brian Huntsbarger at Dinosaur Juice Tuning is an Ohio local and remote tuner, who tunes my car. He'll meet you at any shop or tune on the road.

[Marozl1LE]

Any Update who tune this car it runs maybe little to rich on dyno ?? I think nothing wrong with 650 whp only on 93 Octane

[KingLT1]

Originally Posted by Marozl1LE

Any Update who tune this car it runs maybe little to rich on dyno ?? I think nothing wrong with 650 whp only on 93 Octane

I retuned it for him on E50...it was rich prior .78. I leaned it out to .83 and added some timing through most of the curve. Also tuned the trans and raised the shift points. He dropped back to a 2.5 pulley, and it still makes over 12 psi. MAT went from 150's down to 130's. Not sure if he put it back on the dyno or not since. But I will say the X port is pretty nice. Since it doesn't hit as hard down low, the fuel system will go further. Not to mention it pulls all the way to redline instead of tapering off up top like stock blowers are known to do.

[Dan82679]

Your making great power for those mods and the ported blower helps generate less heat. Do you live in a warm climate? That 2.3 may hurt you with timing getting pulled if your mats get to high.

[NG329]

Originally Posted by KingLT1

I retuned it for him on E50...it was rich prior .78. I leaned it out to .83 and added some timing through most of the curve. Also tuned the trans and raised the shift points. He dropped back to a 2.5 pulley, and it still makes over 12 psi. MAT went from 150's down to 130's. Not sure if he put it back on the dyno or not since. But I will say the X port is pretty nice. Since it doesn't hit as hard down low, the fuel system will go further. Not to mention it pulls all the way to redline instead of tapering off up top like stock blowers are known to do.

Hey, quick question. When you say that it doesn't hit as hard down low, can you be more specific and give me an idea as to what RPM it starts to come on?

[JSH]

644 is about right. Stock is around 565. I don't believe these cars realize the traditional 15% loss. This drive train is too good

[ST1LE]

This is a great thread for someone trying to wrap their head around modding a ZL1. So much more to it than my old LS3. When fueling is needed is still a bit of a mystery.

I wasn't even considering porting the blower until reading up in here.

[KingLT1]

Originally Posted by Dan82679

Your making great power for those mods and the ported blower helps generate less heat. Do you live in a warm climate? That 2.3 may hurt you with timing getting pulled if your mats get to high.

Did you not read my post above? Lol

Originally Posted by NG329

Hey, quick question. When you say that it doesn't hit as hard down low, can you be more specific and give me an idea as to what RPM it starts to come on?

it just hits with less boost is all. Starts around 8psi in the 3k rpm range and builds to 12psi on the 2.5 pulley by 6500rpm.