Dyno Day

[Paul Workman]

Originally Posted by XfireZ51

Some more info to take a look at. Speed Inc. was good enough to send me the data files of Friday's runs. There's a compare of the first run on Friday with no additional tuning and the swap in of the SW Xpipe and last run of previous set with MFlow resonator in place. Numbers are very close but look at the AFR. Significant difference. Xpipe appears to have leaned the AFR by almost .5:1 requiring richening of the fueling. There's also a compare of the first run with the final run on Friday and then one of just the final run. If you play with the WinPep7 reader software, you'll find that torque increased in some spots by ~20lbft rw between the first and last run. There's almost a consistent 15rwtq/rwhp between these runs and removing the smoothing shows a Max HP of nearly 430rwhp which I expected.

Looking good, Dom. Welcome to the "500" club!

Now a nice 4.30 gear for the rear, and you can bench race with the best of 'em!


(U know I'm juss pullin yer tail, buddy! LOL!)

P.

[sammy]

nice detailed write up of the differences . will show alot of people that they need to retune the car when going to an x pipe from a resonator shows the importance of retuning the car when you make a change before bitching that it doesnt run any faster . how many times have we done/heard that .lol

[XfireZ51]

Originally Posted by sammy

nice detailed write up of the differences . will show alot of people that they need to retune the car when going to an x pipe from a resonator shows the importance of retuning the car when you make a change before bitching that it doesnt run any faster . how many times have we done/heard that .lol

Brad,

Absolutely. And its not the kind of thing where you buy a tune "off the shelf" either. I spent 2 1/2 hrs on the dyno Friday and so far almost 5 hrs total. And that's just WOT. I've probably burned about 50 cals for this motor so far. Some of the changes are minimal or tweaks. Some more substantial and involving quite a few parameters for driveability, idle quality, and PThrottle.

[XfireZ51]

Very nice day in Chicagoland for mid-November. Had to take car out for a brief playtime. The power is intoxicating. 2nd and 3rd gears pull. You can feel the power on reserve. Just tip the throttle and there's MORE, period.
Torque? Yep!
Banging 3nd gear, the car jumps as tires grab. Still keeping ASR ON with street tires but the Nitto Invos feel pretty good. I find myself looking for unsuspecting GTs, Sti's or M3s. Damn this is fun!!!!!
What's fun is having a ZR-1 with 100k+ on the ODO and not giving a shi* about driving it to keep the miles down.

[4-cam]

Nice job Dom, sounds like all the effort paid off. I'm salivating, reading these threads. It's great having you guys doing all the beta testing, paving the way for us ZR-1 rookies. I need to start ordering parts!

[Paul Workman]

Originally Posted by XfireZ51

Very nice day in Chicagoland for mid-November. Had to take car out for a brief playtime. The power is intoxicating. 2nd and 3rd gears pull. You can feel the power on reserve. Just tip the throttle and there's MORE, period.
Torque? Yep!
Banging 3nd gear, the car jumps as tires grab. Still keeping ASR ON with street tires but the Nitto Invos feel pretty good. I find myself looking for unsuspecting GTs, Sti's or M3s. Damn this is fun!!!!!
What's fun is having a ZR-1 with 100k+ on the ODO and not giving a shi* about driving it to keep the miles down.

You've come a long way "since then", Dom!

As for the "unsuspecting", you can add all C5s and base C6s to the "road kill". Now, Pete, Kevin, Bob G, and Al...doan hafta tip their hat to nuttin!

P.

[mike100]

Too close to tell if they weren't dyno'ed the same day. A drag race might be the best way to find out who has the most area under the curve.

[XfireZ51]

Originally Posted by mike100

Too close to tell if they weren't dyno'ed the same day. A drag race might be the best way to find out who has the most area under the curve.

The curves are both SAE corrected. However, not on the same dyno. Same dyno, different day would be closer.