Think it's about time to spin some rollers (Aaron's dyno)

Shaun41178(2) · Post by **Shaun41178(2)** » Thu Oct 23, 2008 12:33 pm

11-11.5 is just fine afr wise. Its safe. Its what I try to run on mine. Its a little harder though with the nitrous. It runs a tad leaner like 12.0's

Aaron · Post by **Aaron** » Thu Oct 23, 2008 2:01 pm

I'd like to see 12.0s, but we'll see how it goes. I'd rather keep it safe though.

I got the video camera, it works good, and records sound fine. I took a quick video of the LS1 before it gets put to sleep for the winter.

Aaron · Post by **Aaron** » Thu Oct 23, 2008 5:23 pm

Here's a teaser video of my car getting on the highway. 1st, 2nd, and into 3rd gear. 8.7psi, shifting at 7200rpm. I'll be turning the boost up to 13 or so for the dyno.

http://www.youtube.com/watch?v=jWHWIE9-qjk

Series8217 · Post by **Series8217** » Thu Oct 23, 2008 5:47 pm

Awesome.

Aaron · Post by **Aaron** » Thu Oct 23, 2008 6:20 pm

And here is the idle and FreeRev video. I slowly revved to about 4k, then hard to 7000 or so RPM.

http://www.youtube.com/watch?v=2MGk7gu2TH8

Shaun41178(2) · Post by **Shaun41178(2)** » Thu Oct 23, 2008 8:17 pm

awesome. Glad to see some vids. Your tranny is so smooth going to second. Its like you barely have to pull back on the shifter. How many miles is on it? Not to mention it sounds awesome and revs so quick.

Mine is fairly notchy but its got around 99k miles on it and 20 years.

Aaron · Post by **Aaron** » Thu Oct 23, 2008 8:32 pm

Shaun41178(2) wrote:awesome. Glad to see some vids. Your tranny is so smooth going to second. Its like you barely have to pull back on the shifter. How many miles is on it? Not to mention it sounds awesome and revs so quick.

Mine is fairly notchy but its got around 99k miles on it and 20 years.

Steven said the same thing, and his just came from a rebuild with fresh synchros! I'm not sure why mine is so smooth, factory tranny with 120,000 miles. However Doug took care of it, and it has GM Synchromesh.

My friend's Fiero, the maroon 88GT 3.4 DOHC, its tranny shifts horrible. It won't shift above 6500, and each shift takes a long time since the synchros have to catch up. And if you try to rush it, it grinds. Taking it to the 1/4mi was hell.

Thanks for the compliments!

Series8217 · Post by **Series8217** » Thu Oct 23, 2008 9:01 pm

Aaron wrote:
Shaun41178(2) wrote:awesome. Glad to see some vids. Your tranny is so smooth going to second. Its like you barely have to pull back on the shifter. How many miles is on it? Not to mention it sounds awesome and revs so quick.

Mine is fairly notchy but its got around 99k miles on it and 20 years.
Steven said the same thing, and this just came from a rebuild with fresh synchros! I'm not sure why mine is so smooth, factory tranny with 120,000 miles. However Doug took care of it, and it has GM Synchromesh.

To clarify, since he worded that funny.. MINE has a fresh rebuild with brand new synchros, and Aaron's is stock with 120,000 miles. No fuckin way I can shift like that. I've never seen a Getrag shift as well as Aaron's. Pretty awesome.. I just want to know how to make mine do that from 7100 RPM.

-Steven

befarrer · Post by **befarrer** » Thu Oct 23, 2008 9:13 pm

I heard somewhere that the Getrag's synchro's dont work well after 6500RPm or so. Or the oiling is reduced because the gears are spinning too fast. I cant remember what. But I have a 92 Getrag with 100 miles on it, shifts way better than my old 90 getrag with 200K on it, but still is very notchy at my redline of 7100RPM, but really smooth at lower idle.

Series8217 · Post by **Series8217** » Thu Oct 23, 2008 10:09 pm

befarrer wrote:I heard somewhere that the Getrag's synchro's dont work well after 6500RPm or so.

Indeed. Mine shifts well at low RPM too. My ideal shift RPM is around 7000 though. Notice Aaron is shifting at like 7100 with no problem..

Aaron · Post by **Aaron** » Thu Oct 23, 2008 11:07 pm

7200, I hit fuel cut right before I shifted :thumbleft:

Series8217 · Post by **Series8217** » Thu Oct 23, 2008 11:09 pm

I will post a video of me shifting at the same points once I get my brakes bled. Then we can see how much of a difference there is in shifting (and speed!).

crzyone · Post by **crzyone** » Fri Oct 24, 2008 12:00 am

Maybe the aluminum flywheel makes the difference?

Series8217 · Post by **Series8217** » Sat Oct 25, 2008 1:44 pm

crzyone wrote:Maybe the aluminum flywheel makes the difference?

I have the same flywheel.

Aaron · Post by **Aaron** » Sat Oct 25, 2008 2:07 pm

417whp at 5500rpm, 427wtq at 4200rpm

The tune is Godawful. As soon as boost came on hard, it dove rich, and pegged the WB. It picked up a little where peak power came on, then dove again. I had a setting wrong on my FTC1, and it was only reading half RPM (So idle was at 450). Thus, every change I made to the table, didn't do anything because the motor never went into the cells I changed. I'm working on resolving this. I haven't been able to get the RPM reading right, but I did change the cells it was reading from. For the temporary, it will work.

3.4 DOHC dyno record beat, by 2whp.

http://videos.streetfire.net/video/88-F ... 194049.htm

Series8217 · Post by **Series8217** » Sat Oct 25, 2008 2:53 pm

Nice numbers, but it says its using SAE correction factor, which is 1.25 for that run, eh?
417/1.25 = 333.6 hp at the wheels uncorrected.
That sure seems awfully low for uncorrected numbers based on your mods, but it does say on the graph that they ARE using a 1.25 correction factor.. which they shouldn't be for a turbocharged car.
Of course, you are running insanely rich... so maybe 336 isn't so far out of the picture.
When you go back with it tuned and put down 500 hp on 14 psi, it'll be pretty obvious they shouldn't be using that correction factor

See: http://forums.nasioc.com/forums/archive ... 73912.html for a good description of the use of SAE correction factors...
And: http://www.tillman-speed.com/forum/view ... hp?f=4&t=9 dyno operator explaining how the correction factor is written into the graph and can't be removed by the dyno operator, to keep the numbers honest. Of course, the end user can just photoshop them out...

Go back with a good tune, tell them to turn correction off. You'll probably make about the same power..

Series8217 · Post by **Series8217** » Sat Oct 25, 2008 3:18 pm

I just downloaded the WinPEP7 user guide (http://www.dynojet.com/viewer/Runviewer.zip), which is the program that your shop used... it confirms that CF: Uncorrected would be displayed if they arent using the correction factor at the bottom.
So next time when you back with it tuned, tell them to turn it off if you want realistic numbers.. SAE even says its not for altitude correction, just for +/- 5% atmospheric conditions correction; if its over 1.06 or so its abnormal and shouldn't be used, or should be limited. The reason the SAE factor is so large is because of the baro correction they're doing, which they are not supposed to for turbocharged cars.

darkhorizon · Post by **darkhorizon** » Sat Oct 25, 2008 3:50 pm

Your talking to the wind series, I already tried explaining it...

The powerband looks pretty fail, the torque drops nearly 100ft lbs just because hie afr starts to get safe.

CincinnatiFiero · Post by **CincinnatiFiero** » Sat Oct 25, 2008 6:01 pm

333.6 uncorrected, that makes my guess close... ish!

Well if 417 is legit, congrats man, sounds bad ass.

Series8217 · Post by **Series8217** » Sat Oct 25, 2008 7:19 pm

darkhorizon wrote:Your talking to the wind series, I already tried explaining it...

The powerband looks pretty fail, the torque drops nearly 100ft lbs just because hie afr starts to get safe.

I think if he tuned it for 12 AFR across the board and optimized his spark timing he could be making around 400 or more uncorrected. That thing is pig rich for sure. Look how sensitive the torque curve is to the AFR..