NefMoto > Technical > Tuning > RS6 V10 boost drop
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Author Topic: RS6 V10 boost drop  (Read 6854 times)
armageddon
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« on: March 02, 2017, 02:34:51 PM »
A friend of mine is tuning his RS6 (4F1907552A) but he is having some issues.

He increased rpm limit to 7300 and upshifts from 6500 to 7000, but now, mostly on 4-5 gear change, after the stock shift point(6500) he is having boost request drop and wgdc goes to 0%.

Max torque maps are at 1000Nm on engine/gearbox and logs only shows 850/900, so it should not be torque limiters.

Is there other limiters he should look at?
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prj
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« Reply #1 on: March 02, 2017, 11:36:15 PM »
Yeah, this ECU is not exactly a DIY project.

1. Your real torque is not 850/900, trans limiter is way before that.
2. There is no point raising anything without tuning the trans. If you cheat the trans it will shift like crap.
3. There is no point raising any RPM, because the shift points are in the trans and the trans will go to limp mode if you overrev it.

Really I recommend getting a tune from someone who knows what they are doing. I am not exactly a noob at this, and I spent months getting the tune just right.
Any f*ck ups are quite expensive on this engine/box.
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armageddon
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« Reply #2 on: March 03, 2017, 01:40:55 AM »
Thanks for the input

He has some experience but with turno hondas, skylines and slme vag diesel engines.

He is runing TTE850 turbos, and from what I recal he saying, trans torque limit was 700Nm, he change that to 1000Nm but still the same. From what he said, he already change everything on gearbox, but could be something missing.
Before he tuned the box, yes, it was going into limp, now is just that boost drop

He have full damos for ecu and transmission, but that means nothing if don't know what to change Smiley
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prj
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« Reply #3 on: March 03, 2017, 04:18:16 AM »
Quote from: armageddon on March 03, 2017, 01:40:55 AM
Thanks for the He has some experience but with turno hondas, skylines and slme vag diesel engines.
Yeah so basically he has no idea what he is doing.

https://www.youtube.com/watch?v=pVFg_6-f24s - something I did a while ago. It's making 975hp now because we made a full dual 3" exhaust for it. The 1->2 shift hits limiter for a moment due to wheelspin.
« Last Edit: March 03, 2017, 04:20:05 AM by prj » Logged
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armageddon
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« Reply #4 on: March 03, 2017, 05:04:24 AM »
Quote from: prj on March 03, 2017, 04:18:16 AM
Yeah so basically he has no idea what he is doing.

https://www.youtube.com/watch?v=pVFg_6-f24s - something I did a while ago. It's making 975hp now because we made a full dual 3" exhaust for it. The 1->2 shift hits limiter for a moment due to wheelspin.

Can I give him your contact? He doesn't mind get someone to tune it, but there is no trustful tuner "expert" in our little country..
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prj
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« Reply #5 on: March 03, 2017, 08:19:57 AM »
You can I guess...
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ramos0815
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« Reply #6 on: March 04, 2017, 03:34:59 AM »
pn i can help you Wink
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STEVEPHILP
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« Reply #7 on: March 10, 2017, 04:35:35 PM »
Quote from: prj on March 03, 2017, 04:18:16 AM
Yeah so basically he has no idea what he is doing.

https://www.youtube.com/watch?v=pVFg_6-f24s - something I did a while ago. It's making 975hp now because we made a full dual 3" exhaust for it. The 1->2 shift hits limiter for a moment due to wheelspin.

That is epic PRJ.
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IamwhoIam
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« Reply #8 on: March 11, 2017, 07:52:12 AM »
your friend is an idiot and he shouldn't be allowed an ECU of any kind, never mind a V10 RS6. His logs just show that. Give the project to someone who knows what they're doing.
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I have no logs because I have a boost gauge (makes things easier)
f-schlauch
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« Reply #9 on: December 29, 2019, 11:26:08 AM »
Quote from: prj on March 03, 2017, 04:18:16 AM
https://www.youtube.com/watch?v=pVFg_6-f24s - something I did a while ago. It's making 975hp now because we made a full dual 3" exhaust for it. The 1->2 shift hits limiter for a moment due to wheelspin.
In the video:
Fully standard exhaust = no decat?
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flash a few, brick a few
prj
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« Reply #10 on: December 29, 2019, 02:10:25 PM »
The exhaust makes surprisingly little difference on these cars.
Main advantage comes from better charge cooling and WMI.

The stock manifolds are the achilles heel of the V10TT, and there is no way to fit anything else in there without either very expensive tooling/casting or cutting the chassis.
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