Nismo87SE

Dyno run 2 is when I advanced my timing to 30 BTDC or 10 degrees from stock. Run 3 is with 20 BTDC which is stock on my car. Now at first you notice that my power peak didn't change but I have around 2-3hp more after 5100rpm with my advanced timing. Even though peak hp doesn't change I still have more power with advanced timing. IMHO if you run 91 octane plus you need to advance your timing at least 2-3 degrees minumimum. My 1st run which is not shown was 119hp/148lb-ft that was in 3rd gear after the car cooled for 20min. My 4th run is in 3rd gear after I did my timing and MAF "tweak". Basically I gained 4hp/5lb-ft just from doing free mods. How about them apples .

Bryan91SE

Thanks a lot for that info Nismo. I have mine up 5, to a total of 20 degrees. My stock timing is listed at 15 degrees. This dyno is really interesting. Horsepower didn't move, but the torque sure did. Next time I go to the strip, I'm going to tinker with it to see the results. What's the highest you think I should try? 25?

[Edited by Bryan91SE on 10-22-2000 at 06:43 PM]

SkyMax

Actually the torque and horsepower increased from his Dyno results. Someone with a 3rd gen VG should try to do this on a dyno and see if they gain similar results. I still need to advance my timing on my new max.

Bryan91SE

A buddy and I were just looking at your dyno and he noted that it looks like it would be best for you to shift at 5500 rpms. I noted that you held out 2nd gear to past 6500 rpms when at the stip. From the chart, it doesn't look like that would be beneficial, however the track numbers are good proof too.

Perhaps the reason is the gear you were in for the dyno? At the track, you're 6500+ in second gear, while at the dyno, you could have been in 3rd for all the runs? Does that matter when the vehicle is stationary?

[Edited by Bryan91SE on 10-22-2000 at 07:11 PM]

Nismo87SE

I have about 20 passes under my belt with my car. I have tried other shift points but I know for a fact that 1-2 shift has to be at 6000rpm. The reason why is because of the gearing of the auto. If you shift at 6000rpm it drops back to around 3900rpm in 2nd gear, now if it shifted at 5700 its at 3600 and so it bogs. The 2-3 shift is less critical but still important. Again based on my results I say shift around 5800-6000rpm in the 2-3 shift. The reason being is because there is more power at 4000rpm than 3700rpm if it did the normal 5600 shift. Don't forget our tachs are off so it may look like 4000rpm but its really like 3850rpm. If one had a JWT ECU then the 1-2 shift should occur around 6100-6250rpm. Looking at my dyno the powerband or sweet spot is about 4300-5600. A 5spd would be in the window at all shifts. where as our autos always drop about 2100rpm. Before I lost my engine I was going to try running smaller diameter tires. This gives me shorter gearing thus quicker acceleration. For example if i ran on 195/50-15s instead of my 195/60-15s it would shorten my final gear from 3.43 to a 4.15. This means instead of finishing the 1/4 around 4500 i would do it around 5000-5200rpm. Combined with my TC I would have more punch than a 5spd max would .

Bret89SER

iTrader: (1)

Where'd you dyno at? Let me know when you have some free time man, we can meet up.
Laterz