gunnerthesnowman

So to start over again to try and make this clear for me , to get barometric correction on my V-88 on my turbo charged sled i would set it up this way . Fuel equation Load = MAP Fuel table Y axis = MGP Open loop Y axis =MGP Ignition table Y axis = map ( for barometric correction ) OR MGP ( for no barometric correction ) Thank you .

Preview: Re: Altitude compensation If you have your fuel table spanned off MGP then you get barometric correction all the time, OK THAT ANSWERS THAT not just off boost. There is no distinction between on and off boost, it is just a different MAP pressure. As the ECU is very configurable, there are many options for how the fuel calculation and mapping is configured. It is very hard to explain in general as it depends on how you configure the ECU as to how barometric correction is applied. Here are some points to note: - When the fuel equation is on Load = MAP, there is NO barometric correction applied by the fuel equation. - Having your fuel table spanned off MGP is what gives you barometric correction as MGP is a function of barometric pressure. - If MGP is used to span the fuel table and your engine is tuned properly then you get barometric correction everywhere. Please ask specific questions about your exact application or give me examples to explain and I will try answer them. So in short for almost all applications use: Fuel equation Load=MAP Fuel table Y axis = MGP--- AND IF RUNNING THE OPEN LOOP TABLE IF HAS TO BE SPANNED OFF MPG AS WELL Ignition table Y axis = MAP OR YOU COULD SPANNED IT OF MPG FOR NO BAROMETRIC CORRECTION You say to ask specific question which i did / have , that when Ray said he found out that he did not know that spanning the open loop table Y axis = MAP with the fuel equation load=MAP , fuel table Y axis= MGP --- that i would not have barometric correction He said he found out that the Open loop Y axis has to be MGP------ OK that done But he also said with this set up i would only have barometric correction on off boost ----- this did not make any cents to me ----that why i asked more specific question . Which i hope you have finally answered ---Thank you Ray also said to have the timeing Y axis table spanned MAP for no baro correction and MGP for Baro correction Now you say Map for baro correction and MGP for no baro correction No wonder why i am getting confused

TTT Just trying to understand how this works , which is correct

Seem to be some miss understanding on how this works!!!

Top -------------------------------------------------------------------------------- Report this postReply with quoteRe: Altitude compensation by rayhall » Thu May 12, 2011 2:07 pm The Vipec will automatically adjust for baro pressures when not on boost. _____________________________________________________________________________________ ***So this fuel barometic correction due to the MAP value changing ( used in the fuel equation ) Is this correction only for off boost as Ray says Or would it be working thoughout the whole fuel map , i would think it would effect the whole map

Hi , could someone explain what/how the vipec does the compensating for barometric change , ray says it does this automatically , what does it do ,he also says it only does this off boost , just trying to understand this unit better . Thanks

OK , thanks ,

Not shore what you are saying ,But it sounds like to me you are saying , if you are running in close loop lambda mode that the unit will not data log!!!

Thanks Simon , i will up date my firmware

TTT , Can vipec support help me out with this , if you need more info just ask. Thanks

Can anyone help me with a good starting setup for the Closed loop control Gain AFR Error table and Closed Loop Control Rate (Hz) table. Thank you.

Ya , stupit why they would do it that way , mine is set for .6% so 6% TPS movement and the Accel enrichment kicks in.

Yes , just decreasing the Accel clamp table was not enough , i also had to decrease the Accel Hold and increase the Accel Decay , the hesitation i had was from just off idle to about 1/2 TPS, any time i move the TPS i had a hesitation ,it showed as a high (lean) AFR then went low (rich) , i had this problem for two years tuning with a Vipec dealer/tuner and he could not get it to work right , he was tuning main fuel/ingition tables making up 3D,4D,5D tables , The standalone ECU is only as good as the tuner , and there is a lot of bad so called TUNERS out there , i can show you the bills to proof it. Tuning a standalone 1L turbocharge sled for 400+HP and still have good low end/off boost throttle response is not easy You say this happen at a cruise , so your TPS should be well of of its stop , may be something different in your case.

I had this same problem with my turbo sled , i though the same thing as you , have to increase enrichment , the problem ended up being to much enrichment which gave a miss fire which showed up as a high ( lean ) AFR , i took some enrichment out and no more problem AFR stays good , and sled works nuts.

Thanks for the help.

Thank you for your reply , yes i though about doing it this way , but since may main fuel map table is done in RPM/MGP and the warm-up map table is ECT/TPS it would be hard to know what area in the main map to pull the fuel , i would have to retune the whole main map again , that why i decided to use a 4D map tabled at ECT/TPS , much simpler . But if there is a dedicated ECT fuel correction table ( as vi-pec suport says there is ) that i can pull fuel , i would be more then happy to use it( if i can find it ) and leave the 4D map table for something eles.

Hi vi-pec suport , since you reply of this dedicated ECT fuel correction table , i have been unable to find such a table , can you point me to the right spot! Thanks

My base map is tuned for a ECT of 40-45degrees , my warm-up enrichment comes off at 40degree , from 40degrees to 100 degrees this table is all 0,s i need to compensate the main map ( pull fuel ) when the ECT rises , and as you are saying i can not put a minus # in the warm-up enrichment table, so i was useing the 4D table set up as TPS-(o-100% )ECT-( 45-90degrees ) to pull fuel. But ashesmen (vipec support ) said i do not need to use the 4D map , there is a dedicated fuel correction table i should be using , just trying to find out what he is talking about.

Tryed this , will not take a minus number , it sayes the number has to between 0-255 , either i am missing something or putting in (-) numbers in an enrichment map can not be done , and i do not know of any other dedicated ECT fuel correction table , just the 4D and 5D!

Thank you , that what i though , just wanted to check. What dedicated ECT fuel correction table are you talking about , if your talking about the WARM-UP ENRICHMENT table it will not let you put a - number in , If there is a different table just dedicated for ECT can you tell me where it is! Thank you

Could someone from vipec support help with this !

Thats funny , that what the wife tells me all the time . With your race car , did you have to pull fuel from the whole map due to the increase in ECT , or only on the lower end? how much did you pull ? how did you set you 4D map up . Any info would be good. From what i see on my sled , as the ECT rises it only affects the low end response , so i was going to set up a 4D fuel map with ECT and TPS. set to ON allways I do have one ? , in such tables as 4D ,5D , IAT correction , if you are pulling -5 at 50% TPS and that is the end of the scale ( no 60% TPS )is the -5 still in affect from 50% TPS to 100% TPS , and if so , if i did add a 60% TPS row with all 0,s in it this would stop any correction from this table ! Thanks

What do you mean 100%m! Yes i understand what you are saying , thank you for your help , i may end up doing just what you suggested , would be the easyest thing for me to do now that i have a map already build with a ECT of 40-45degrees . so , you said you have had the same problem , IAT ( senser ) would stay the same temp. , but ECT starts to rise and the map starts going rich!

Maybe you can help me out on this . viewtopic.php?f=3&t=836&p=5262#p5242

I think he was baseing his ? on what Ray was saying , i know i was/have used the help link pages , as i thought having this help support was one of the GOOD thing that i got when i purchase the vi-pec unit!, but now i don,t know .