vvt18
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« on: March 09, 2020, 11:39:45 AM »
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Hi all.
I'm waiting my garrett gt2871r with performance rating: 280 - 475 HP recommended displacement: 1,8 - 3,0L
compressor: inlet 53,1mm / outlet 71,0mm / trim 56 / 0,60ar
turbine: diameter 53,9mm / trim 76 / 0,64ar / internal wastegate (0,48bar)
Please help me with your advice about how much i must close the wastgate for my turbo make 1 bar boost at 3500-4000rpm.
I think i must have 95 values in IMX table before 3000rpm in all cells , correct , so that all the exhaust gases turn the turbine? LDRXN will be 170 at 3500 rpm and after will make 190to the finish cells
Many thanks in advance.
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prj
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« Reply #1 on: March 09, 2020, 12:00:38 PM »
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vvt18
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« Reply #2 on: March 09, 2020, 12:31:52 PM »
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Sorry but my question is not about boost pid and linearissation. My question is about how much i close the wastegate for a GT2871r (ball bearing) to make boost sooner.It is not like a k04 how can spool sooner than gt28.I want to know if somebody obtained 1 bar at 3500 with a gt2871r and if must to close complete wastegate for a log period
Thanks.
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adam-
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« Reply #3 on: March 10, 2020, 05:23:37 AM »
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Sorry but use PRJs quote to solve this. Jam it shut at 95% and see when it makes boost.
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nyet
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« Reply #4 on: March 10, 2020, 09:18:31 AM »
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Sorry but my question is not about boost pid and linearissation. My question is about how much i close the wastegate for a GT2871r (ball bearing) to make boost sooner.It is not like a k04 how can spool sooner than gt28.I want to know if somebody obtained 1 bar at 3500 with a gt2871r and if must to close complete wastegate for a log period
Thanks.
Your question is 100% about PID and linearization. You set up both to give you 95% while LDE is very large. |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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vvt18
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« Reply #5 on: March 10, 2020, 01:35:27 PM »
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ok.....i need to explain my question in other mode: It is ok if i close the wastegate complete before 3000rpm for a gt2871r with ball bearings? it is ok to force it to make boost sooner or i'll destroy it?
thanks again for your advices to all , special to nyet and prj
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BlackT
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« Reply #6 on: March 10, 2020, 01:44:34 PM »
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You need to learn a lot lot more about how turbo engine work before try tuning it. This good-hearted advice, really
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nyet
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« Reply #7 on: March 10, 2020, 01:55:06 PM »
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ok.....i need to explain my question in other mode: It is ok if i close the wastegate complete before 3000rpm for a gt2871r with ball bearings? it is ok to force it to make boost sooner or i'll destroy it?
thanks again for your advices to all , special to nyet and prj
The odds of you 1) seeing surge and 2) knowing enough to prevent it via tuning are minimal. |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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vvt18
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« Reply #8 on: April 10, 2020, 06:43:15 AM »
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Hi again to all.
I mounted my new garrett gt2871r on my car one week ago
turbo specifications:
Garrett Turbocharger GT2871R - 836026-21 / 743347-4 - 475HP - 0.64ar
compressor: inlet 53,1mm / outlet 71,0mm / trim 56 / 0,60ar
turbine: diameter 53,9mm / trim 76 / 0,64ar / internal wastegate (0,48bar)
- dual ball bearing (743347-4)
- dual ball bearing ceramic (836026-21)
- oil and water cooled bearing system
- internal wastegate with actuator
- Inconel-turbine wheel
I made a log today and it spool to late
I have 1 bar very very late
All parts from engine are in veru good conditions , sensors, maf, map, intake, inlet and exhaust.
What can it be: actuator must to be tight , or must make modification with 100% value after 2300 rpm in IMX or it is the turbo disadvantage because it starts charging very late?
Many thanks in advance to all.
PS: Attached the log and file!
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Auriaka
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« Reply #9 on: April 10, 2020, 09:32:33 AM »
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Where did you get your turbo? By the copy and paste specs I want to say ebay or Ali.
I have a gtx2871 and I start making positive pressure at 2300, I have 1 bar at 3200 and 1.4bar at 3500.
Your log doesn't have RPM points so can't really see where its at, but it is down there. Your G/s is really low for a gt2871. 190 is stock turbo territory. You also start leaning out in the top when your getting desired of .826 lambda and actual is .89
I don't think you have an IMX problem, I think you have a bum turbo or a hardware setup. There is some tuning issues that are still there.
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vvt18
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« Reply #10 on: April 10, 2020, 10:56:08 AM »
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Sorry my friend but is a genuine garrett from an authorized dealer and cost 1200 euros.
Lear about lambda? is not a a tunning problem because my lamfa table is ok and bts was not activated , so please see the graphic. after 4250 i cut my log because the car started to no longer grip on the road and that's why the lambda went crazy.
So maybe you can learn more.
Do you said in 200rpm your boost increased 0.4 bar? HMmmmmm. Show me your imx and your LDR!
Maybe you can not read complete specification. The compressor wheels is like a gt30 - trim is 56!
Yes 190 load because for the moment i reduce it , i don't have forged rods in my engine, i work with stock AUM engine.
Only thing is maybe i must keep imx to 95-100% after 3000rpm or must to change the actuator.
PS: nmot_w is there in the log!
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« Last Edit: April 10, 2020, 11:01:14 AM by alin1 »
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Auriaka
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« Reply #11 on: April 10, 2020, 12:57:14 PM »
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My imx and drl will do you no good considering our setups will be differant. I have a built engine.
My turbo is a 56t 53.1/71.4mm compressor with .60 housing, exhaust is 53.85/47 76trim
I can share a video with you of how mine spoils if you wish.
Have you tried to muck around with KFVPDSD or KFVPDSE yet...... your .5bar spring is differant then stock .3bar and the mannerisms of how that turbo comes on is vastly differant then stock
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fknbrkn
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mk4 1.8T AUM
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« Reply #12 on: April 10, 2020, 01:01:09 PM »
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Have you tried to muck around with KFVPDSD or KFVPDSE yet...... your .5bar spring is differant then stock .3bar and the mannerisms of how that turbo comes on is vastly differant then stock
it helps a lot  |
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Auriaka
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« Reply #13 on: April 10, 2020, 01:04:52 PM »
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Here is a snippet. Cruising I. Third gear at 5% throttle, tipping in to about https://youtu.be/GkVsJY-u_Pg |
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fknbrkn
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mk4 1.8T AUM
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« Reply #14 on: April 10, 2020, 01:24:25 PM »
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no one cruising at 4500+
and this difference 0.2 bar .. seriously?
even if he had a 1.2 bar wg spring it wont helps him with a spool problem
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