problems with motordyne setup
12-21-2010, 07:12 AM
#22
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You can't take the difference between the 2 cars as your gain. If your sister's car is running a 12.5-13.0 AFR at WOT, it's going to make much more power than if yours is running a 10.5 (very rich) or a 14.5 (lean) at WOT. So if your tune is now off because of the change in air flow, you're not going to see gains.
I've seen a stock HR that was running a high 10-low 11 AFR at WOT and that is completely stock. So, the cars can vary greatly and until you look at outside factors that cause the differences in power, they're not really comparable. You should have had the dyno operator log AFR on that dyno sheet and it may have allowed us to see if you would gain substantial power from a tune.
Another thing, the stuttering could just be what most other HR's get when they install test pipes. When I only had test pipes on my car, if I would mash the throttle open around 3k-3500 (I think, could have been a little lower, I don't remember exactly) it would stutter a little as it went over that RPM. I would guess it's either a lean spot or due to the cam timing but plenty of other HR owners have experienced the same thing regardless of test pipe/exhaust brand.
I've seen a stock HR that was running a high 10-low 11 AFR at WOT and that is completely stock. So, the cars can vary greatly and until you look at outside factors that cause the differences in power, they're not really comparable. You should have had the dyno operator log AFR on that dyno sheet and it may have allowed us to see if you would gain substantial power from a tune.
Another thing, the stuttering could just be what most other HR's get when they install test pipes. When I only had test pipes on my car, if I would mash the throttle open around 3k-3500 (I think, could have been a little lower, I don't remember exactly) it would stutter a little as it went over that RPM. I would guess it's either a lean spot or due to the cam timing but plenty of other HR owners have experienced the same thing regardless of test pipe/exhaust brand.
12-21-2010, 07:40 AM
#23
Hey 08 Sleeperz, we did not do any wideband measuring when we dynoed cause we were just doing baseline runs. I think all your numbers are pretty on point with your mods like we talked about when you were here. Also the hesitation is also from the tapering air fuels like we talked about. When you do a full exhaust including test pipes, initial throttle tip in is too lean and as you run through the power band it tapers rich and starts to become optimum around 4k right around where it starts to clean up.
I doubt you have a issue with any of your sensors, i think we just need to put a good tune on there.
Also the HR motor is tough in the aspect that Nissan did as much as they could from the stand point of timing and fueling on those motors to make the 300hp that they make. So they do make as large of gains over stock as the DE and REV-UP motors do...
I doubt you have a issue with any of your sensors, i think we just need to put a good tune on there.
Also the HR motor is tough in the aspect that Nissan did as much as they could from the stand point of timing and fueling on those motors to make the 300hp that they make. So they do make as large of gains over stock as the DE and REV-UP motors do...
12-21-2010, 08:18 AM
#24
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Hey 08 Sleeperz, we did not do any wideband measuring when we dynoed cause we were just doing baseline runs. I think all your numbers are pretty on point with your mods like we talked about when you were here. Also the hesitation is also from the tapering air fuels like we talked about. When you do a full exhaust including test pipes, initial throttle tip in is too lean and as you run through the power band it tapers rich and starts to become optimum around 4k right around where it starts to clean up.
I doubt you have a issue with any of your sensors, i think we just need to put a good tune on there.
Also the HR motor is tough in the aspect that Nissan did as much as they could from the stand point of timing and fueling on those motors to make the 300hp that they make. So they do make as large of gains over stock as the DE and REV-UP motors do...
I doubt you have a issue with any of your sensors, i think we just need to put a good tune on there.
Also the HR motor is tough in the aspect that Nissan did as much as they could from the stand point of timing and fueling on those motors to make the 300hp that they make. So they do make as large of gains over stock as the DE and REV-UP motors do...
12-21-2010, 09:26 AM
#26
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It was good to meet you guys...you all seem very knowledgeable. Is cam timing the same as cam angle tuning? Tony from Motordyne says that you get the most tq from this system when the exhaust cam angles are tuned. Just wondering if that was the same as cam timing or not. Thanks again.
12-21-2010, 09:46 AM
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Hi Vince, just a little off topic, but can running too lean or rich cause a drop in mpg?
Op, you may want to check the last post here https://my350z.com/forum/vq35hr/5017...ml#post8850552
He got a custom tune and it didnt solve the hesitation issue.
Op, you may want to check the last post here https://my350z.com/forum/vq35hr/5017...ml#post8850552
He got a custom tune and it didnt solve the hesitation issue.
Last edited by xthejokerx; 12-21-2010 at 09:54 AM.
12-21-2010, 10:54 PM
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Looks like we are in the same boat 08sleeperz. I posted up pretty much the same scenario here:
https://my350z.com/forum/vq35hr/5081...ity-check.html
I admit, all the hype got me believing N/A mods were worthwhile. Obviously that is not the case on the HR Z.
https://my350z.com/forum/vq35hr/5081...ity-check.html
I admit, all the hype got me believing N/A mods were worthwhile. Obviously that is not the case on the HR Z.
12-22-2010, 05:41 AM
#31
Hi Vince, just a little off topic, but can running too lean or rich cause a drop in mpg?
Op, you may want to check the last post here https://my350z.com/forum/vq35hr/5017...ml#post8850552
He got a custom tune and it didnt solve the hesitation issue.
Op, you may want to check the last post here https://my350z.com/forum/vq35hr/5017...ml#post8850552
He got a custom tune and it didnt solve the hesitation issue.
12-22-2010, 08:42 AM
#32
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Looks like we are in the same boat 08sleeperz. I posted up pretty much the same scenario here:
https://my350z.com/forum/vq35hr/5081...ity-check.html
I admit, all the hype got me believing N/A mods were worthwhile. Obviously that is not the case on the HR Z.
https://my350z.com/forum/vq35hr/5081...ity-check.html
I admit, all the hype got me believing N/A mods were worthwhile. Obviously that is not the case on the HR Z.
I guess it was just wishful thinking, but after talking with quite a few people it seems like a tune will increase low end pull and driveability which is what I was trying to do anyway. So, even though I spent a lot, I now don't think its a waste.
12-22-2010, 10:00 AM
#34
RT's dyno also seems to underrate cars a little, but you definitely need a tune, too.
Vince and his crew have done a great job taking care of my concerns and I will continue to tune with them in the future. I went back for some tuning and to address some codes from the O2 sensors and ended up fattening up my powerband and making a total 308whp/280wtq on my built 06 rev-up motor w/ cams.
Since they installed my built longblock, I will also be bringing over my SG long tube headers for install and tune in the next couple weeks. I'm hoping to make some midrange/high rpm power with the race headers.
Vince and his crew have done a great job taking care of my concerns and I will continue to tune with them in the future. I went back for some tuning and to address some codes from the O2 sensors and ended up fattening up my powerband and making a total 308whp/280wtq on my built 06 rev-up motor w/ cams.
Since they installed my built longblock, I will also be bringing over my SG long tube headers for install and tune in the next couple weeks. I'm hoping to make some midrange/high rpm power with the race headers.
12-22-2010, 03:42 PM
#35
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RT's dyno also seems to underrate cars a little, but you definitely need a tune, too.
Vince and his crew have done a great job taking care of my concerns and I will continue to tune with them in the future. I went back for some tuning and to address some codes from the O2 sensors and ended up fattening up my powerband and making a total 308whp/280wtq on my built 06 rev-up motor w/ cams.
Since they installed my built longblock, I will also be bringing over my SG long tube headers for install and tune in the next couple weeks. I'm hoping to make some midrange/high rpm power with the race headers.
Vince and his crew have done a great job taking care of my concerns and I will continue to tune with them in the future. I went back for some tuning and to address some codes from the O2 sensors and ended up fattening up my powerband and making a total 308whp/280wtq on my built 06 rev-up motor w/ cams.
Since they installed my built longblock, I will also be bringing over my SG long tube headers for install and tune in the next couple weeks. I'm hoping to make some midrange/high rpm power with the race headers.
12-24-2010, 11:01 AM
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My bad, I ran into some problems and had to take care of some things (not with the car). Its all tuned up and I will post up the sheets when I get a chance to scan them. Good new: the hesitation is gone! I gained about 10hp and 7ft/lbs throughout the rpm range. It feels good, I just wish the low end gains were a little more...the car doesn't really seem to take off til about 3500-4k. But, once it does, it is amazing. All in all I'm happy with the results but I'm still hung up on the "numbers" and my previous expectations, but I guess I have to get over that. Like I said, I'll post the dyno sheets asap.