Pre/post dynos with Motordyne Shockwave ))) Exhaust
06-24-2009, 08:51 AM
#21
Honestly, hard to say. When I bought it, the "tune" it came with detonated at the high-end from overtiming. I was running 94 octane to compensate for it. Rather than re-tune for the old set-up then RE-tune for the new set-up, we did the 1:1 on 94 octane with nothing else changed, but there were still a few ticks over 6300RPM (with both exhausts). After we made the exhaust change and did the dyno, ZCG pulled some timing to get the detonation in check, and it subsequently made more power. I suppose I don't know for sure if backing off on the timing on the NISMO would have made the same power gains. . .
10-16-2009, 01:27 PM
#23
Update:
"Those goals were to make a few extra ponies and lighten the car up a bit for the track and autox."
Original car weight and power (when purchased USED): 3180#, and 250rwhp/237rwtq
After tune (MD [lighter] exhaust, rear gutted, cats installed): 3060#, and 259rwhp/242rwtq
After re-tune (NISMO headers swapped for ported stockers, more weight reduction, test pipes installed): 2920#, 266rwhp/250rwtq, but look at the tq/hp pick-up from 3-5k RPM.
You can read about my reduction from 3180# to 2920# (and not done yet) on the last few pages here: https://my350z.com/forum/engine-and-...your-z-34.html
"Those goals were to make a few extra ponies and lighten the car up a bit for the track and autox."
Original car weight and power (when purchased USED): 3180#, and 250rwhp/237rwtq
After tune (MD [lighter] exhaust, rear gutted, cats installed): 3060#, and 259rwhp/242rwtq
After re-tune (NISMO headers swapped for ported stockers, more weight reduction, test pipes installed): 2920#, 266rwhp/250rwtq, but look at the tq/hp pick-up from 3-5k RPM.
You can read about my reduction from 3180# to 2920# (and not done yet) on the last few pages here: https://my350z.com/forum/engine-and-...your-z-34.html
Last edited by scotts300; 10-16-2009 at 01:29 PM.
10-16-2009, 04:25 PM
#25
Those are great numbers Scott. That area at 3-4 got great improvements. Doesn't really matter for you but I wonder what contributed to that drop at 2500. What were your intentions by going back to the stock headers, aren't they heavier then the nismo?
Btw, never asked Rob, but do you know if his dyno runs are ran under load or not?
Btw, never asked Rob, but do you know if his dyno runs are ran under load or not?
Last edited by gabe3d; 10-16-2009 at 04:26 PM.
10-20-2009, 09:54 AM
#26
Those are great numbers Scott. That area at 3-4 got great improvements. Doesn't really matter for you but I wonder what contributed to that drop at 2500. What were your intentions by going back to the stock headers, aren't they heavier then the nismo?
Btw, never asked Rob, but do you know if his dyno runs are ran under load or not?
Btw, never asked Rob, but do you know if his dyno runs are ran under load or not?
As for Rob's dyno, I didn't know that they couldn't be run without being under load. . .His dyno is so new, so I'm sure it follows the same as the other Dynojet Research systems.
10-20-2009, 11:22 AM
#27
Thanks! I asked Rob about the slow ramp at low RPM, and he said he likes to apply the pedal smoothly down low rather than just stomp on it. I put the stock headers back on to fund the goodies to make this a safer track car. I forgot to weigh the stock headers, but I bet their weights are within the noise of each other. I spent hours porting the casting marks on them, and given the data available, the NISMO headers on a stock engine don't give much in the way of gains.
As for Rob's dyno, I didn't know that they couldn't be run without being under load. . .His dyno is so new, so I'm sure it follows the same as the other Dynojet Research systems.
As for Rob's dyno, I didn't know that they couldn't be run without being under load. . .His dyno is so new, so I'm sure it follows the same as the other Dynojet Research systems.
Yeah his dyno machine is pretty new and it's a higher model one that allows him to preload or not the machine when performing a test. If I recall correctly he does tune under load but I completely forgot whether the dyno he hands out are in which mode (it seems to me to be under load, but not 100% i'll ask him this week). I'm asking this since it will make a big difference for capturing the effect of rotating mass. I did some testing on a mustang dynamometer with my car and got some pretty interesting results when I lightened my rotors and changed rims.
04-19-2010, 07:32 AM
#31
I'll ask Rob if he can get the data for those files so we can do the delta plots.
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