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Big Turbo Discussion Thread #2

A3-Owner

Ready to race!
Hopefully clutches aren't slipping vs tires losing grip because of torque. You can verify by putting it on dyno. There is an expected correlation between boost and torque. If you see boost going up but torque not following trans is slipping. None of the off the shelf DSG tunes offer additional clamping force but you can get a custom DSG tune that will and if you clutch pack is still in decent shape, may take care of your issue.

I put in a clutch pack, LSD and also added a full DSG cooling system in prep for the power. You can put in a Dodson racing clutch pack but they wanted like 2700 for the clutch pack, would love to have done that but at the time just could not bring myself to dump an additional 2K into the trans after already dumping almost 5K into it.

Cost of clutch pack is about 2K installed parts and labor. I didn't notice if you have an LSD but if you don't, get one, makes a HUGE difference and if you have to do tranny then it is a perfect time to put one in.

If you go w/m Aquamist is the one to use and would be classified as an intelligent system compared to Snow, Devilsown etc. Read about it on their website.
Thanks again for the great feedback. I do have a custom DSG tune. I will talk with the tuner. I am learning a lot on this thread. Your build thread is great.

Through a shop from a long time ago, I heard my tuner doesn't like DSG clutch packs and doesn't think they are needed and they get in his way.

I will get the car on the dyno soon.

My tuner updated the tune and got the overboosting from the lower elevation taken care of. 29 PSI on 91 octane. Local shop owner's butt dyno thought 360-380 WHP. Tune seems a bit smoother now. It drives very well around town with the lag it has. It drives the way you mentioned. Great for giving passengers a fun time. Overall I am happy with the way car turned out. The suspension is well done and the brakes are good with a NQSBBK setup. Need new coilovers and want to do camber plates.

I have not done any launches to see if how that is. I thought it was slipping because if you watch videos of clutch slips, you see the RPM gauge slow down for a moment in time and that is what I was seeing when I did my only launch at this elevation.

I will look into a LSD. I see you have a Mfactory. Like them?

My shop advised to look at Peloquin. I would love to get a rear LSD if we didn't have that dumb ring gear in the diff.

I am also looking into external oil and DSG coolers and the Tyrol radiator (1150?!). Local shop is writing up quotes for me.

I want to make this a weekend track car. Tracks that have long straights. I did auto X for a few years and that was fun.
 

A3-Owner

Ready to race!
b

You do not need clutches in a dq250, just a good tune that corresponds with your ecu tune. The gears will let go before the clutches, you can see it on mk7s and I have stripped an 02q and dq250. DQ250 will hold up to ~700nm of tq.

If you want more than that FFE has gears or dq500

Also my Aquamist setup will be for sale in about a month and so will my Sirhc boost control with VR conditioner and 2x relays
My tuner said something very similar.

I don't think I will go high enough powerwise to go beyond the limits of the DQ250.

I will check out your sale on your Aqaumist setup when you put it.
 

GIACUser

Master Wallet Mechanic
Thanks again for the great feedback. I do have a custom DSG tune. I will talk with the tuner. I am learning a lot on this thread. Your build thread is great.

Through a shop from a long time ago, I heard my tuner doesn't like DSG clutch packs and doesn't think they are needed and they get in his way.

I will get the car on the dyno soon.

My tuner updated the tune and got the overboosting from the lower elevation taken care of. 29 PSI on 91 octane. Local shop owner's butt dyno thought 360-380 WHP. Tune seems a bit smoother now. It drives very well around town with the lag it has. It drives the way you mentioned. Great for giving passengers a fun time. Overall I am happy with the way car turned out. The suspension is well done and the brakes are good with a NQSBBK setup. Need new coilovers and want to do camber plates.

I have not done any launches to see if how that is. I thought it was slipping because if you watch videos of clutch slips, you see the RPM gauge slow down for a moment in time and that is what I was seeing when I did my only launch at this elevation.

I will look into a LSD. I see you have a Mfactory. Like them?

My shop advised to look at Peloquin. I would love to get a rear LSD if we didn't have that dumb ring gear in the diff.

I am also looking into external oil and DSG coolers and the Tyrol radiator (1150?!). Local shop is writing up quotes for me.



I want to make this a weekend track car. Tracks that have long straights. I did auto X for a few years and that was fun.
Look forward to following your progress and yes I like my MFactory setup, works great. Peloquin or Wavetrac are the players in the market for our cars.

My shop discouraged me from buying the radiator you mention. I did install a DSG cooler

Not sure why you would see an RPM slowdown with slipping DSG, if anything I would expect higher rpms and lowered torque.

I had some progress of my own today. Shop called and they got final tune done on my car. I asked for a tune that I could beat on all day long at the track (road course, like you said with lots of long straights).

Final Tune

480whp
  • no dyno sheet yet (I am guessing this is a generous dyno not a Mustang)
  • peak power achieved at 27psi
  • full boost at 3500 rpm (tuner said it boosted almost as quick as K04 setup)
  • 91oct in tank + 100% Methanol through Aquamist - 1 jet per intake runner plus 1 for cooling (5 jets)
  • RS4 injectors, 155fprv, GolfR intake cam, APR HPFP, TTRS LPFP and Torqbyte PM3

I should have car back in a couple of weeks. As the tuner indicated, it will be a tire shredder.
 
Last edited:

joeyfrost

Ready to race!
Noticed some “fuel cut” issues, funky idle, and random hesitation.

I found and fixed the issue. It happened to be the pressure sensor on the HPFP.

QUICK BACKGROUND:

I installed a aftermarket intake manifold and forgot to switch the pressure sensor and the drain valve located on the HPFP for clearance. I damaged the plastic connector on the pressure sensor (no biggie it still worked) so I took the sensor off of my OEM pump that I had laying around and installed that.

Thats when the issues started happening. I thought it was from the intake manifold install but no. I swapped the sensor just to see if it would make a difference and all the issues were eliminated. Swapped it back and they came back.

I have been speaking with HPA as we were trying to troubleshoot the issue but low and behold it wasn’t the manifold.

Now, my questions.....

I have the APR HPFP and it came with the sensor to the left in the photo. My OEM is the sensor on the right. Theres obviously a difference with the orifice so I’d like to know:

1: which is the latest and greatest sensor from VW after the TSB?

2: the one on the right thats larger obviously didnt work so where can I purchase the one on the left? ( the connector broke and cannot read MFG P/N)

3: which sensors are you guys running?

Lastly, if its worth anything my pump has the numbers 7 2 on the housing.

Kind thanks everyone.



PS: Should I open this in a new thread? I know everyone is active in here with their builds and would probably be more familiar with what I’m talking about. I will open a new thread now just in case..
 

U-20T

Go Kart Champion
if you buy from a dealer you will get the newest as well as they can tell you the connector and get you one as well.
 

jettaglx91

Go Kart Champion
Noticed some “fuel cut” issues, funky idle, and random hesitation.

I found and fixed the issue. It happened to be the pressure sensor on the HPFP.

QUICK BACKGROUND:

I installed a aftermarket intake manifold and forgot to switch the pressure sensor and the drain valve located on the HPFP for clearance. I damaged the plastic connector on the pressure sensor (no biggie it still worked) so I took the sensor off of my OEM pump that I had laying around and installed that.

Thats when the issues started happening. I thought it was from the intake manifold install but no. I swapped the sensor just to see if it would make a difference and all the issues were eliminated. Swapped it back and they came back.

I have been speaking with HPA as we were trying to troubleshoot the issue but low and behold it wasn’t the manifold.

Now, my questions.....

I have the APR HPFP and it came with the sensor to the left in the photo. My OEM is the sensor on the right. Theres obviously a difference with the orifice so I’d like to know:

1: which is the latest and greatest sensor from VW after the TSB?

2: the one on the right thats larger obviously didnt work so where can I purchase the one on the left? ( the connector broke and cannot read MFG P/N)

3: which sensors are you guys running?

Lastly, if its worth anything my pump has the numbers 7 2 on the housing.

Kind thanks everyone.



PS: Should I open this in a new thread? I know everyone is active in here with their builds and would probably be more familiar with what I’m talking about. I will open a new thread now just in case..

Probably wouldnt be a bad idea to start a new thread for diag on your car since this one is specifically TSI big turbo.
 

smanierre

Go Kart Champion
So someone in one of the facebook groups posted a compressor map comparing the BW S257SX-E to a G25-660 saying it'll make more power and with the twin scroll housing will spool up around the same time, if not earlier than the 660. Anyone have any experience with these turbos? I was thinking either the .83ar T4 divided or the .75ar T3 divided, but don't know enough about AR and T3 vs T4 to make a well informed decision.
 
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