Ahmed_otb

count me in for 5 of those

phantasms

Isn't it about 30rwhp per 1 psi?

If stock is 9.4 and you're at 12.1, and you hit 608 RWHP .7 over stock, and we're sticking with that 30hp rule then you should be in the neighborhood of 668 RWHP. Of course this couldn't possible be reality...or could it? 100hp at the wheels with an intake setup?!?!? I'm looking forward to the track results and come October I'll probably be one of the many supplying them.

Best,
Gene

Higgs Boson

more like 10 BHP per psi, definitely not 30 rwhp.

8 at the wheels then....not so sure about a boost increase from this mod though, especially if the intake still has such a vacuum in it. I think there is more to a measured boost reading change from pull to pull, especially with a stock tune in it.

btw, I do have a Halltech intake on my car (thanks Ben@WeaponX) so I am not pooping on them, I love the intake! And if this mod does indeed make such a difference, I will certainly purchase one.

phantasms

Ah the voice of reason. Thank you. I searched the forum and 30hp per psi is all that was mentioned. It did seem a little ridiculous I'll admit. I'm still very excited to see where this product goes.

6Speeder

I think it's more than that. I added the IW 9% pulley to my car, with NO OTHER CHANGES it gained 25 RWHP peak, and 50 rwhp at 3,500 rpm. That's from a one pound gain of boost, peak, 1.7 PSI at 3,500 rpm. This is on a car that already had the Halltech CKNZ, which gained me 40 RWHP SAE from stock, with no tune.

Higgs Boson

Do you have the exact weather data for both runs? It's an impressive difference for sure and not common.....however, and I don't mean to lay down any poop because maybe it is real, but with the inconsistency in the stock tune with minor differences in IAT, ECT, cat temp, etc etc it would be very interesting to see all of the data for both runs. The stock tune really seems to go from lion to kitten with no gray area. It almost seems we don't really know for sure what we will get when we mat the pedal on the stock tune. Airflow, pressure, temps, hp, etc are all based on physics and fairly standard, well tested calculations with the major variable in this thread being the inconsistent stock tune.

Ben@WeaponX

I agree 30 is high but I think 10bhp is a on the low side. Engine compression, blower efficiency, temps, etc all come into play but comparing something close in engine and blower size - On other platforms like a gen2 CTS V with a 1.9L blower, jumping up 3psi with a 2.5 pulley and a tune is good for approx 80whp and about 30-35whp is from the tune. That would leave approx 16whp per psi and that engine has lower compression than the LT4.

Disclaimer for the bench racers - Not trying to sell anything here or open up another debate with the Akra trolls on here that don't know anything like the last informative thread. LOL These results have also been proven time and again by shops all over on that platform.

Higgs Boson

i could go 15 depending on application for sure.

6Speeder

From the dynojet data log:

Stock pulley: 73.98 *f, 24.46 in hg, 10% humidity, SAE: 1.23

With 9% pulley: 78.14*f, 24.52 in hg, 25% humidity, SAE: 1.24

Both of those runs were after a 5 min cooldown, ECT was in the 190's.

We also did 5 runs with a stock Z, and they all were within 5 SAE rwhp. VERY CONSISTENT.

Halltech

Just a footnote on my screenshots.

I have never tuned our car, which I stated earlier, but the important thing to take away from my HPTuner scans is that we have 7200 miles on our C7 Z06 and have had our Stinger CFV onboard from January 2015 until May 2015, and the same Stinger-RZ (rotomold version) from May 2015 to date.

There has been some talk about the Halltech losing the power gained once the ECU adapts to the intake. That is pure nonsense, as my timing and power illustrates. No tricks, no octane boost, no restoring the LTFTs (which does seem to bump up dyno pulls), no nothing but our intake and the new TRIC Ram Air system.

I drive in Touring Mode all the time because I like the attenuated exhaust note. I have a real temptation to install the Akra Exhaust system, but in order to show results that compare to the 90% that leave their car stock except for our intake, I have passed on this mod. Otherwise it would be onboard.

I drive the car hard, except when I am in town. We have many roads out here with exceptionally cool curves, and now that the weather is nicer (in the mid 80s) I have much more fun.

Ben@WeaponX

That is a great gain; however, the AFR is not constant on this (if we're simply talking about gains per psi). When you're leaning the car out a little it is also making more power from less fuel - esp when the COT kicks in. Regardless, it is still cool to see and somewhat supports what I was saying about it being higher than 8hp but a lot less than 30hp of course too. Thanks!

Colonel

"That is a great gain; however, the AFR is not constant on this"

Ben, it's only showing boost on the bottom graph unless I'm missing something.

NicD

I usually see between 20-25 rwhp on average per pound of boost. Of course it's very combo dependent, for example if it's already way past peak compressor efficiency or is near the octane limit then it won't make as much as you increase boost. If it's basically stock and nowhere near the octane knock limit then it will make a bit more per psi. I see 20-25 rwhp per psi on pretty much every combo that isn't maxed out in one way or another however and that's going back to when we first supercharged and turbocharged the LSx platform back in 2001 to now on the LTx platform.

I'll also add that I want one of these ram air setups, they just plain work and I would love to do some testing on them since I have access to all equipment necessary to fully test this with a high speed air source to try to mimic airflow at speed on the dyno.

Higgs Boson

He is saying that if it is the stock tune, as stated, for both runs then more airflow without a tune to correct fueling will result in a leaner AF ratio with the pulley (or intake or any other airflow enhancing modification). As rich as the stock tune is, leaner will mean more power so it's a variable not accounted for in the overall gain.

If 1 psi is 10-15 HP then the other 10-15 came from a leaner AF ratio.

Alaska SS

Great news. As soon as the list opens i'll be on it. This is my 2nd Z, C6 and C7, and both have your CAI...love'em!!!!

6Speeder

With the pulley it did run leaner, but not as much as some would think. The largest difference was 0.4 leaner, and both went super rich when COT kicked in, all the way below 11.0:1.

I don't believe a 0.4 change in A/F would give me 10-15 horsepower. As Nicd said I've done pulley swaps on other vehicles and generally saw 20+ rwhp gains per pound of boost.

Higgs Boson

That's really good and a testament to our motors, imo. I do think that a half point AF can easily provide a 10 HP bump though. As we know, it all depends on where we started.

Colonel

Ahh, gotcha Higgs. Thanks. I agree that we'd need to confirm the AFR to be the same to narrow it down to just the increase in boost supplying the increased power.

1QUICK Z

Jim, I'm loving my Halltech CAI and I might be interested in this piece as well once we see numbers at the drag strip. My question is how difficult will the install be? Any cutting required? Thanks for all of your hard work!

3 Z06ZR1

Glad to you are off the "it will slow back down wagon" touted by a few that never left the station. Positive gain that lasts!
I love mine as well.