Ramee's Tiguan Build Thread 155KW DSG

[Wynnston]

Hey Ramee,

How come your inputs are RCA's? Isn't the line level input on the MRXV70 a special plug, or will it take RCA's for the line level as well?

[Ramee]

Hey Ramee,

How come your inputs are RCA's? Isn't the line level input on the MRXV70 a special plug, or will it take RCA's for the line level as well?

I am sure MRXV70 special plug is for speaker level inputs. RCA connectors of the AMP needs a line level signal (pre amp). So I enabled line level(pre amp) signals from RCD510 using a VAGCOM cable.

Funny thing is even though MRX amp's manual mention signal sensing power on work only with speaker level inputs, It will still power up with pre amp outs from RCD 510 feed through RCA connectors. This will save you from trouble of wiring separate remote wake up line for the Amp.

[Ramee]

Tiguan Down Pipe

After looking for many weeks for a ready made down pipe ( 3 inch), I decided to custom build one from a local shop. It was not a easy job as it looks IMO and had to do few iterations to get it done. Now It is at a functional level but need some work to make it look nice

[Ramee]

3 inch down pope with 200 cell cat makes car much more enjoyable to drive. I can clearly feel the increase torque at low rpms due to earlier turbo spool. Our DSG tigs always try to keep engine RPM low like 1500 or below so turbo spool around 1700 is always a good thing when need a quick acceleration.

With the new down pipe car sounds mostly OEM and I like to keep it that way because want to preserve Tig's sleeper characteristics .

Another thing I realised with the mod is I now can easily feel the limits of the turbo, It seems to be maxout around 4500 5000 RPM

[Ramee]

My subwoofer build is almost complete.. Did a test run, it sounds great. I will try to use some polyfill and see it makes any difference

[CCAMO]

This is a great thread Ramee.

As a soon to be Tig owner there is some great info here.

Thanks

[tigger73]

3 inch down pope with 200 cell cat makes car much more enjoyable to drive. I can clearly feel the increase torque at low rpms due to earlier turbo spool. Our DSG tigs always try to keep engine RPM low like 1500 or below so turbo spool around 1700 is always a good thing when need a quick acceleration.

With the new down pipe car sounds mostly OEM and I like to keep it that way because want to preserve Tig's sleeper characteristics .

Another thing I realised with the mod is I now can easily feel the limits of the turbo, It seems to be maxout around 4500 5000 RPM

I do think the turbo does spool better with a 3" DP, however not because of the larger diameter. If anything the larger diameter will actually slow the velocity of the exhaust gases not speed them up.

I think the reason that it performs better is due to the high flow cat and removing the restriction/horrible contraption right at the turbo.

I'm not an expert in thermodynamics, however there's a few theories floating around. Here's an interesting read on the effect with some VCDS logs which shows very little difference between the spool rate for stock and 3" DP: Turbocharger Spool Up Test | MyAudiS4

[Ramee]

It is a good experiment.. But I noticed there is a significant difference at the initial stage of his graphs ( First two seconds period) which could explain the difference we feel. After that I think may be ECU is taking over the control of boost so probably need a new map to capture full potential of the upgrade.

I do think the turbo does spool better with a 3" DP, however not because of the larger diameter. If anything the larger diameter will actually slow the velocity of the exhaust gases not speed them up.

Actually what makes turbo spool faster is the pressure differential from input of the turbo to exit of the turbo. So if we could get the turbo exit pressure low as possible then turbo will sense increase pressure differential and will spool faster. So how we make less pressure at the turbo exit that is by removing the resistance to flow after the turbo. To do that we remove cats / remove sharp bends/ polished internal surfaces of the pipe (to create laminar flow and less surface friction) and larger diameter pipes . Actually larger the diameter less resistance so less back pressure. I can not remember those equations I studied but pipe diameter certainly affects the flow resistance.

[Ramee]

This is a great thread Ramee.

As a soon to be Tig owner there is some great info here.

Thanks

Thanks mate.. Good luck with your TIG

[Wynnston]

I am sure MRXV70 special plug is for speaker level inputs. RCA connectors of the AMP needs a line level signal (pre amp). So I enabled line level(pre amp) signals from RCD510 using a VAGCOM cable.

Funny thing is even though MRX amp's manual mention signal sensing power on work only with speaker level inputs, It will still power up with pre amp outs from RCD 510 feed through RCA connectors. This will save you from trouble of wiring separate remote wake up line for the Amp.

Hmm. Does anyone know if you can do the same (enable line level) for the RNS510?

I think for the RCD it's "VW Sound System" and disable "Monitoring" but I don't have my VCDS on me to check atm.

[team_v]

It is a good experiment.. But I noticed there is a significant difference at the initial stage of his graphs ( First two seconds period) which could explain the difference we feel. After that I think may be ECU is taking over the control of boost so probably need a new map to capture full potential of the upgrade.

So did you get a re-map after the downpipe was installed?
Also, is that a hotdog centre muffler instead of the oem resonator?

[Ramee]

Hmm. Does anyone know if you can do the same (enable line level) for the RNS510?

I think for the RCD it's "VW Sound System" and disable "Monitoring" but I don't have my VCDS on me to check atm.

Hey Wynnston, Yes It will work for RNS510 ... Actually I followed the RNS510 coding for my RCD 510 and it worked !! Original instructions are for RNS510..

Check this out: Volkswagen RNS 510 coding when installing with a factory amplifier | my-gti.com

[Ramee]

So did you get a re-map after the downpipe was installed?
Also, is that a hotdog centre muffler instead of the oem resonator?

I think/hope APR or any other tuner stage 2 map includes those corrections.. Unfortunately I could not go to get my tune on booked date and now my APR dealer has gone for holidays Have to wait until he comes back.

I think what you are referring is my hi flow cat They use a cat with flange so easy assembly and disassembly of the down pipe.
"Hotdog muffler".. that is a new part I learned from you!!

[Ramee]

I just found out beaurepairs got a nice web app to check wheels and tyres on our Tigs. Car can even be viewed in lowered setting

Link:
Wheel Selector - Match Wheels & Rims to Your Car or Vehicle

[Ramee]

Finally managed to get stage 2 tune from APR.. All I can say is super nice!!

After tune my CEL is gone and also answered some of my questions. What I was wondering was Stage 2 is just stage 1 map with CEL removed and all the gains comes from the downpipe install. But now I can say by first hand experience, stage 2 map really makes a difference, and I could feel it much more than stage 1 + downpipe. I am looking forward to run some logs and 0 100 runs to see the new improvements. Hopefully car is now in low or mid 5 sec range for 0 to 100.


Also I could get 104 octane map too.. With race fuel it could generate 290 hp at the crank with this map. Love to test it after I get my hands on some race fuel. Next power mod is going to be water meth so I can run this map on 98 fuel when I needed Water meth can help to cool down the intake Air and increase octane of fuel and my friend running it in his Mini cooper without any issues. Also what I heard is it also eliminate pressure loss of going for larger intercooler.



Tig with its faster brothers