TVS L61 Torque dive
#26
I have no idea. I assume you are talking about converting the data of airflow and fuel into a power curve? I'm pretty sure trifecta's logs are locked down but I'm not certain. I'm thinking next time I hook up to a dyno I will do a couple pulls while logging for trifecta, and then hook up something like HPT just to datalog.
#28
So it sounds like I would have to do this on the street. How does it figure in aerodynamic resistance? If it doesn't it will get further and further off the faster speeds I log. I may be able to do something like that with my Bluetooth OBD reader.
#32
Exactly, horsepower is a calculated figure from torque and rpm so why would I worry about it? I am trying to figure out why my torque curve does not sustain like it should into the upper rpms. This would also correlate to a higher peak HP. If I am concerned about my torque not holding out like it should why should I also be concerned with the HP line not continuing to climb like it should when it is essentially the same thing? I can calculate Hp if I need to. No need to muddy the waters talking about hp being graphed correctly with respect to torque and rpm as that makes no difference for what I am trying to figure out.
#33
#34
My issue is torque taking a nose dive waaay too early. That also makes hp nosedive but hp is just (Torque x RPM)/5252. So when my concern is my torque dropping off before it should what does the HP line being displayed correctly or incorrectly have to do with anything I'm concerned about? I could plot my own hp line if that was a problem. I'm trying to figure out is there something fucked up with my car or did something go wrong with the dyno. The HP line is irrelevant to the problem we are seeing here.
Alternatively I could concern myself with the HP line taking a nose dive before it should but as it is a calculated figure it makes more sense to me to focus on the actual variables instead of a calculated figure based on those variables.
Alternatively I could concern myself with the HP line taking a nose dive before it should but as it is a calculated figure it makes more sense to me to focus on the actual variables instead of a calculated figure based on those variables.
#35
Joined: 05-15-11
Posts: 27,413
Likes: 584
From: Livonia, MI
Its a free program, go download it. You have to enter vehicle weight, tire size, frontal area, **** like that. Its not perfect but gets you the shape at least.
The following users liked this post:
jdbaugh1 (10-19-2017)
#37
I can use my OBD scanner and app to get a glimps of the same thing. I just used it on my way back to work and did a 2nd gear pull up to around 7,500 rpm it was showing about 250 tq and 360 hp though it's just a live graph so I couldn't look real close. I'll probably mess around with that a bit more but I'm fairly confident at this point that the dyno was doing something funky towards the upper end and I'd also be surprised if I had as much low end torque as it was reporting though that is just an assumption based on other peoples results with similar setups.
#39
#41
I think about 130 is pegged for my speedo. It actually hits 120 and goes a bit further before it is maxed out which would be hard to tell from the camera angle. On the street pull I didn't reach the pegged position were on the dyno it reached the pegged position. I don't think clutch was slipping.
#44
Below is a screenshot from my OBD scanner app of a "virtual dyno" of sorts. I did a very short pull heading out of town in second gear up to 7,000 rpm. This may not be super accurate but it is close enough, combined with how it feels up top, that I am now convinced that there was an error on the dyno.
RPM scale on op left, airflow scale on top right, horsepower scale on bottom left, torque scale on bottom right.
RPM scale on op left, airflow scale on top right, horsepower scale on bottom left, torque scale on bottom right.
#46
Didn't say anything about calculating whp accurately in 2nd. Said this tells me enough to be confident that the dyno readings are way off, at least up top. And I am. I did some pulls using this same app in 3rd and got very similar results. Don't really have anywhere near me that I can go rev out 4th gear.
#47
You ever get that second dyno done? I have seen this posted on several sites now.
When adding a lower pulley you also increase heat which needs to be controlled that is why you see many lower pullied cars making more TQ than HP. HP is lost at Hi RPM from heat generated from added blower speeds.
When adding a lower pulley you also increase heat which needs to be controlled that is why you see many lower pullied cars making more TQ than HP. HP is lost at Hi RPM from heat generated from added blower speeds.
#48
You ever get that second dyno done? I have seen this posted on several sites now.
When adding a lower pulley you also increase heat which needs to be controlled that is why you see many lower pullied cars making more TQ than HP. HP is lost at Hi RPM from heat generated from added blower speeds.
When adding a lower pulley you also increase heat which needs to be controlled that is why you see many lower pullied cars making more TQ than HP. HP is lost at Hi RPM from heat generated from added blower speeds.