question for the uprev tuners
#1
Registered User
Thread Starter
iTrader: (3)
Join Date: May 2009
Location: earth
Posts: 1,365
Likes: 0
Received 0 Likes
on
0 Posts
question for the uprev tuners
can you make it so the rev limit just bounces instead of cutting off the fuel with uprev osiris?
i always plan to shift before that point, but in the case i for some reason do not, i would rather have the rpms bouncing off the limiter instead of cutting fuel. my reasoning being that i will be on nitrous on occasion and cutting fuel with nitrous is not the best of ideas, if you know what i mean. thanks
i always plan to shift before that point, but in the case i for some reason do not, i would rather have the rpms bouncing off the limiter instead of cutting fuel. my reasoning being that i will be on nitrous on occasion and cutting fuel with nitrous is not the best of ideas, if you know what i mean. thanks
#2
Living in 350Z
iTrader: (30)
Join Date: May 2009
Location: Spartanburg(SparkleCity), SC
Posts: 4,293
Likes: 0
Received 2 Likes
on
2 Posts
can you make it so the rev limit just bounces instead of cutting off the fuel with uprev osiris?
i always plan to shift before that point, but in the case i for some reason do not, i would rather have the rpms bouncing off the limiter instead of cutting fuel. my reasoning being that i will be on nitrous on occasion and cutting fuel with nitrous is not the best of ideas, if you know what i mean. thanks
i always plan to shift before that point, but in the case i for some reason do not, i would rather have the rpms bouncing off the limiter instead of cutting fuel. my reasoning being that i will be on nitrous on occasion and cutting fuel with nitrous is not the best of ideas, if you know what i mean. thanks
They recommend setting the throttle cut rev limit 100rpm below your fuel cut rev limit. With nitrous, I'll be using a controller with WOT switch that senses "by wire" so the throttle cut will shutdown nitrous at the lower (throttle cut) limit - even with the pedal to the floor, it will no longer be "at WOT". The controller also runs an RPM window switch and I'm setting the top of that window just below the throttle cut rev limit.
For example, assuming a raised rev limit to 7300:
Uprev Fuel cut rev limit 7300rpm
Uprev WOT Throttle cut rev limit 7200rpm
Nitrous Controller WOT Throttle sensor "by wire"
Nitrous Controller RPM Window - 3000-7100
The controller also has a lean afr nitrous cutoff, which is a nice safety feature.
Last edited by SparkleCityHop; 01-10-2012 at 03:31 PM.
#3
Registered User
Thread Starter
iTrader: (3)
Join Date: May 2009
Location: earth
Posts: 1,365
Likes: 0
Received 0 Likes
on
0 Posts
yea, i can always just use the window switch to cut it off before then, but another saftey feature would be nice especially if its as easy as hitting a few buttons in the tuning software.
i would also add that even if your solenoids close at 7100 in your example, there might some nitrous still going through the lines after that. i know there probably wouldnt be, but the rpms are climbing awefully fast on spray so we are talking about a split second between 7100 and 7300 when all fuel is suddenly gone. i just like to err on the side of caution. but you are right, using the window switch is what i do and should be enough.
edit: i guess if i follow my logic all the way through this example, there would then be some fuel still in the lines after the fuel was cut at 7300, so that would leave a saftey buffer too i guess
i would also add that even if your solenoids close at 7100 in your example, there might some nitrous still going through the lines after that. i know there probably wouldnt be, but the rpms are climbing awefully fast on spray so we are talking about a split second between 7100 and 7300 when all fuel is suddenly gone. i just like to err on the side of caution. but you are right, using the window switch is what i do and should be enough.
edit: i guess if i follow my logic all the way through this example, there would then be some fuel still in the lines after the fuel was cut at 7300, so that would leave a saftey buffer too i guess
Last edited by mgrotel; 01-10-2012 at 03:38 PM.
#4
Living in 350Z
iTrader: (30)
Join Date: May 2009
Location: Spartanburg(SparkleCity), SC
Posts: 4,293
Likes: 0
Received 2 Likes
on
2 Posts
It's not that different than letting off the throttle (as far as what's left in the lines).
The main part of your question could have been answered just with the throttle cut limit vs fuel cut limit, I probably muddied it up with the other switch questions, but felt those were probably a given safety consideration for a decent sized shot.
The main part of your question could have been answered just with the throttle cut limit vs fuel cut limit, I probably muddied it up with the other switch questions, but felt those were probably a given safety consideration for a decent sized shot.
Last edited by SparkleCityHop; 01-10-2012 at 03:49 PM.
Trending Topics
#8
Registered User
Thread Starter
iTrader: (3)
Join Date: May 2009
Location: earth
Posts: 1,365
Likes: 0
Received 0 Likes
on
0 Posts
why dont you two read? no where was my original question answered, no where. he didnt tell me anything i already didnt know. if there is one thing i know, its nit setups.
once again, my original question:
can uprev osiris change the fuel cutoff to make it bounce off the limiter and keep moving fuel into the motor?
once again, my original question:
can uprev osiris change the fuel cutoff to make it bounce off the limiter and keep moving fuel into the motor?
#11
Vendor - Former Vendor
iTrader: (7)
Bouncing off the rev limiter is fuel cut....essencillay u hit the limit...it cuts fuel..drops 200rpms(or whatever u set it at) turns the injectors back on...and then custs it again when you hit the limiter.
UPREV does not have a ignition cut option....as they are pretty dangerous anyway...
UPREV does not have a ignition cut option....as they are pretty dangerous anyway...
#12
Registered User
Thread Starter
iTrader: (3)
Join Date: May 2009
Location: earth
Posts: 1,365
Likes: 0
Received 0 Likes
on
0 Posts
ok, thanks vince.
i guess my question should be is there a way to make it go back to fueling quicker then? because now when i hit the rev limiter, it cuts fuel for a really long time, like a matter of seconds before i can go again. id rather it cut for a split second only like you refer to. thanks
i guess my question should be is there a way to make it go back to fueling quicker then? because now when i hit the rev limiter, it cuts fuel for a really long time, like a matter of seconds before i can go again. id rather it cut for a split second only like you refer to. thanks
#13
Vendor - Former Vendor
iTrader: (7)
^^^ that sounds like throttle cut actually. So what u will wanna do is raise your throttle cut to above your fuel cut and then make your fuel cut wherever ya want. Then make your fuel restore a 100 rpms lower. That will make it pretty quick. Also on the nitrous cars we set up we stop spraying at 6500 and fuel cut is 6800...
#15
Living in 350Z
iTrader: (30)
Join Date: May 2009
Location: Spartanburg(SparkleCity), SC
Posts: 4,293
Likes: 0
Received 2 Likes
on
2 Posts
I thought that fuel cut was the one that took longer to recover from when it happened, whereas throttle cut was just that once you hit the rpm, it dialed back your throttle from being sensed as WOT and acted as if the throttle voltage was lower that WOT. But Vince is going to know much better than me - I'm an Uprev noob. I was probably just making the wrong assumption about how the two different limits that you can set in the software work.
#16
Registered User
iTrader: (1)
Fuel cut/restore is instantanious. It cuts fuel at a set RPM and restores fuel at a lower set RPM. So it can be as slow/quick as you set it to be.
Throttle cut on the other hand is a slow process... take VDC for instance (which relies on throttle cut to control wheel spin).
Throttle cut on the other hand is a slow process... take VDC for instance (which relies on throttle cut to control wheel spin).
Thread
Thread Starter
Forum
Replies
Last Post