Dyno Tuning - ZR-1 Net Registry Forums

XfireZ51 · 10-16-2010

Its been a while since I have had the car to the dyno for some tuning and there have been some small modifications made to it. In preparation for the Corvette Challenge next week at Rt.41 I decided to take the car to Speed Inc. for some tuning. Lgaff was going to join me but couldn't make it. Spent a couple of hours with Larry (thanks), and ran the car 6 times including a baseline run.

Here is a graph of the before and after with the top line being FINAL run and calibration with bottom being the baseline for HP/TQ/AFR. I cleaned up the AFR quite a bit especially at the bottom end. Also made some timing mods. The combinaton of the changes resulted in a 11rwhp/13crank, 10rwtq/12cranki increase. Looks like torque peak is at about 5300rpm, with HP peaking at about 6700 but remaining relatively flat to 7200rpm. I was pleased and felt it was certainly worth the money. Also found out that my shift light was inaccurate and causing me to shift too early. That would explain the lower trap speeds since installing it.
Curses =Jeff= for selling it to me.

Aurora40 · 10-16-2010

Nice!

Is that your after AFR that is right on 13? I suspect my car has a bit more in it, it's usually in the 12:1 range and dips into the 11's slightly a few places. I'm a bit scared to monkey with it though, since it's holding together fine.

XfireZ51 · 10-16-2010

Quote:

Originally Posted by Aurora40

Nice!

Is that your after AFR that is right on 13? I suspect my car has a bit more in it, it's usually in the 12:1 range and dips into the 11's slightly a few places. I'm a bit scared to monkey with it though, since it's holding together fine.

Aswer to first question is : Yes ranging between 12.8-13.0. I'll have data for the runs emailed to me so I can get more accurate info.
May want to lean out the top end just a tad more. I also had the opportunity to compare my ZT-2 WB and the tailpipe sniffer that Speed Inc. used. They were within .1 of each other with mine being slightly richer and installed at the collector.

Would definitely pay to lean it out.

Paul Workman · 10-17-2010

Quote:

Originally Posted by XfireZ51

Morning Dom!

I'm glad to see what appears to be a nice bump in performance. Glad you got the lift and appreciate the comparison graphs to study.

But, that said, I'm a little dubious of the conclusion your draw re leaning - at least from comparing the AF vs. output graphs - they don't appear to track!

I refer to the graph:

Specifically the "before"(?) AF is close to 12.0 at 4000rpm in the "before" graph and it then leans out to essentially the same as the "after" readout (12.8-13.0 realm) on the upper rpm end: the output "before/after" graphs are essentially parallel without regard to the significant leaning - especially at the 4000rpm mark.

Hmmmmm..... sez me. There is an apparent lift in output hp, but it doesn't appear to track the changes in AF since the output graphs are parallel across the entire rpm band and yet the "before/after" AF varies to some significant extent between 12 and 13 (primarily at 4000 rpm).

To me, the graph could support another conclusion: There is little/no correlation between "before and after" results that are supported by AF changes from 12 to 13. In other words it could be said: "There is no significant change in output for AF changes between 12 and 13."

However, there is that 11 RW lift in output - across the entire graph, which (maybe only to me) suggests that something else is afoot: timing changes, or engine temp...DYNO...something else.

In any case, the resulting output is pretty stout, compared to similar mods posted by others - ranging from 370-385 ish, and most especially considering the Magnaflow resonator/muffs you're using goes against the convention of open 3" systems we've seen. Very impressive tuning!

FWIW,

P.

PS: Since you showed us "yours", I'll show you mine later this week after Marc H is done tweaking (Wed).

And, refresh our (my) memory w/ regard to your mods: To what extent did you P&P your plenum and IHs and heads? You're running headers, but who's are they and what is the diameter of the tubes?

Again...Very impressive.

That should be enough to make a "few" sit on the edge of their seats, come Saturday!

Ccmano · 10-17-2010

Very nice Dom... almost to that 400rwhp mark! Have you timed your cams?
H

-=Jeff=- · 10-17-2010

Quote:

Originally Posted by Ccmano

Very nice Dom... almost to that 400rwhp mark! Have you timed your cams?
H

I think if he timed them the heads he is selling would be on his car..

XfireZ51 · 10-17-2010

Quote:

Originally Posted by Paul Workman

PS: Since you showed us "yours", I'll show you mine later this week after Marc H is done tweaking (Wed).

And, refresh our (my) memory w/ regard to your mods: To what extent did you P&P your plenum and IHs and heads? You're running headers, but who's are they and what is the diameter of the tubes?

Again...Very impressive.

That should be enough to make a "few" sit on the edge of their seats, come Saturday!

Mods are DIY P&P with port match to the heads, 1 7/8" Watson headers
going into MagnaFlow cat back no cats. Resonator IS installed. 63mm TB, Accel Injectors, MSD coils and wires. Fidanza FW and Hurst shifter. Secondary throttle plates removes but linkage and shafts still there.
My tune using TunerPro, =Jeff='s Ostrich and EASE scantool w ZT-2 WB

Hans,

Cams have not been touched since I have owned. don't know what they are set at.
Again, I encourage you all to tune your Zs. There's no such thing as a generic or "good enough" tune IMHO.
You would be surprised how a change in drivetrain etc changes the tune.
The ECM doesn't "make up for it". Like anything else, the less the ECM needs to intervene the better.

Ccmano · 10-18-2010

May be you should give us a write up of how to do this and what equipment we need to buy. With those long dark winter months coming up it might be a good project.
H

XfireZ51 · 10-18-2010

Quote:

Originally Posted by Ccmano

May be you should give us a write up of how to do this and what equipment we need to buy. With those long dark winter months coming up it might be a good project.
H

Hans,

It isn't a matter of a writeup and buying equipment. I'd be happy to help anyone that's interested and suggest you begin reading about tuning.
www.thirdgen.org has much better articles as "stickies" to read than anything I could write up(http://www.thirdgen.org/techboard/di...uide-book.html). I would also suggest going to
www.tunerpro.net and download a copy of Tunerpro RT. Definition files for
each year Z are available. If you want to download your current calibration, you'll need a chip burner and software or I can do that for you but I will physically need your prom. Start by just viewing your calibration as it sits currently and begin understanding the various parameters and what they do. VE and SA tables are basic ones and a good place to start.
I also use a Moates Ostrich for real time changes to the calibration. Another is the Prominator. I believe both are supported by TunerPro RT or TunerCat RT. When I first started tuning, I didn't have an emulator available to me. I must have burned over 1000 chips on my 84.

XfireZ51 · 10-19-2010

I just got the data for the dyno runs and discovered something interesting. I'm using WinPep 7 and began playing with the smoothing.
The 394.7rwhp was SAE corrected and using a smoothing factor of 5(max)
If I remove any smoothing so we have the raw data points, I end up at
398.89rwhp/358.77rwtq which is nearly identical to an uncorrected number. STD correction gets me to 408rwhp/367rwtq (I really like this number

)

10-16-2010	#1
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Dyno Tuning Its been a while since I have had the car to the dyno for some tuning and there have been some small modifications made to it. In preparation for the Corvette Challenge next week at Rt.41 I decided to take the car to Speed Inc. for some tuning. Lgaff was going to join me but couldn't make it. Spent a couple of hours with Larry (thanks), and ran the car 6 times including a baseline run. Here is a graph of the before and after with the top line being FINAL run and calibration with bottom being the baseline for HP/TQ/AFR. I cleaned up the AFR quite a bit especially at the bottom end. Also made some timing mods. The combinaton of the changes resulted in a 11rwhp/13crank, 10rwtq/12cranki increase. Looks like torque peak is at about 5300rpm, with HP peaking at about 6700 but remaining relatively flat to 7200rpm. I was pleased and felt it was certainly worth the money. Also found out that my shift light was inaccurate and causing me to shift too early. That would explain the lower trap speeds since installing it. Curses =Jeff= for selling it to me. Last edited by XfireZ51; 10-16-2010 at 05:09 PM.

10-16-2010	#2
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: Dyno Tuning Nice! Is that your after AFR that is right on 13? I suspect my car has a bit more in it, it's usually in the 12:1 range and dips into the 11's slightly a few places. I'm a bit scared to monkey with it though, since it's holding together fine. __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img]

10-17-2010	#5
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Dyno Tuning Very nice Dom... almost to that 400rwhp mark! Have you timed your cams? H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

10-18-2010	#8
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Dyno Tuning May be you should give us a write up of how to do this and what equipment we need to buy. With those long dark winter months coming up it might be a good project. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

10-19-2010	#10
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: Dyno Tuning I just got the data for the dyno runs and discovered something interesting. I'm using WinPep 7 and began playing with the smoothing. The 394.7rwhp was SAE corrected and using a smoothing factor of 5(max) If I remove any smoothing so we have the raw data points, I end up at 398.89rwhp/358.77rwtq which is nearly identical to an uncorrected number. STD correction gets me to 408rwhp/367rwtq (I really like this number )