Audi S3 8l big turbo advice

[Slick3349]

Hi all,

I have just finished my build on my S3. It made 271wkw on leons Dyno (fr and r) at 1.7 bar.

Now my question is, i have now dropped the boost to 1.3bar because i am really worried about braking a gearbox or side shaft or clutch etc. Any one here have experience with the 8l S3, if so can you shed some light on whether or not my car will be able to withstand the abuse of 1.7bar. I will run NF and wmi on 1.7bar. I havent launched the car yet, and when i grow a pair, wont launch it at every robot to present itself. I do offer my car mechanical sympathy.
It has forged internals.
Thanks for advice, in advance.

[Donavan]

Go search for Pieter Moolman on facebook. Send him a pm or invite him as a friend.
He will be able to give you some advise seeing that he's got a 400kw+ S3 8L.

Ps....his profile pic on facebook is off himself swinging a golf club

[Killerwatt]

Clutch would typically go first at high torque. But this can be easily upgraded.
The weakness in the 02m box is the 4th gear which strips at high power levels. Search online for a 4th gear support or a solid insert for the shaft.
The other weak point is the transfer case.

[Slick3349]

thanks for the replies. I will do some homework on the transfer case and gearbox and see if there is anything I can do now before it gives up. I am pushing 465nm at the wheels.

I will contact Pieter Moolman now.

[LostEnigma]

You will come to learn that the s3 will break what ever you haven’t replaced...

Pistons... Iv made holes in them
Rods... didn’t give them a chance to bend...
Valves... dropped plenty
Clutch... changed before any issues...
4th gear selecter shaft... snapped that
Cv boots... on my 12th one
Exhaust leak... they love to appear in the worst places..
Turbo... meh replaced with a legend JP Turbo and never looked back

That was all with my previous motor when I was making 281wkw and 428nm

Car is definitely making more now... and i haven’t driven her 15 times since last year... and when I do.. 3000rpm cruises.

[THANAS]

It's not normal at all to burn holes in stock 1.8T pistons or drop valves, that isn't a hardware issue unless someone installed the valve assembly incorrectly. Specifically at high power you need to closely monitor AFR, timing retard and EGTs or your motor will not last long. Rods should always be upgraded, clutch you replace/upgrade when it starts to slip.

To the OP: install an EGT and AFR gauge, and run logs on a regular basis to make sure you aren't seeing lots of timing retard. Do you know if the stock EGT sensor has been moved over to the new turbo setup?

[panic-mechanic]

Whenyou run high power levels on the 20v head ask the engineering to make the clearances on the valve guides reasonably loose. Too tight makes them bite and that is when you are losing the valves.

[Slick3349]

Howsit Panic,

Thanks, I have stainless valves and different springs to strengthen the head. (It might not be stainless, but I know they were uprated. the guy I bought the car from had it done when he put a conrod through the block with the Ko4. he then did forged rods, did some work on the head, had a baby and then had to sell the car...To me.

When Leon mapped the car he said he turned on the WMI and mapped it at 1.7 bar on 95 with 50/50WMI, however when I got home I found that I had not connected the vacuum line to the WMI controller so it wasnt mapped with WM... is it known that the car can run 1.7 bar on 95 safely, or is it a disaster waiting to happen. for the mean time I have dropped the boost to 1.3, and when I was running 1.5 the other day I put NF ultra in and had my wmi working.

the reason I ask is as it always happens, the oke in his done up car only ever pulls alongside you when you don have NF or WM and I have turned down the quick dice because of this, as apposed to going balls to the walls and taking the chance.

[THANAS]

Whenyou run high power levels on the 20v head ask the engineering to make the clearances on the valve guides reasonably loose. Too tight makes them bite and that is when you are losing the valves.

This makes sense, i guess there are certain unexpected benefits to an aging motor

Also if the tuner can't tell that wmi is working or not during tuning.....

[JonathanT4]

Whenyou run high power levels on the 20v head ask the engineering to make the clearances on the valve guides reasonably loose. Too tight makes them bite and that is when you are losing the valves.

This makes sense, i guess there are certain unexpected benefits to an aging motor

Also if the tuner can't tell that wmi is working or not during tuning.....

Logging IAT under load 4WAT

[panic-mechanic]

not Knowing what CR you run it is incredibly hard to even comment on that But generally no 1.7 bar is not safe on 95 octane.

[Slick3349]

I havent lowered the compression, it is still running stock pistons, I have a monstrous FMIC so IAT are very low. Leon said that at 1.7 bar the car was pulling a couple of degrees timing. Do I need a vcds to runs logs, I have heard of people running logs but not sure at all on how to do this. I want to learn to map my own car, I have had experience with mapping stand alone ECU and piggy backs as I used to work for perfect power for a couple of years, So I understand how its done, but after researching how to do the Audis ECU it seemed very in depth and would need to spend some time with someone in the know to make sure I dont make any expensive mistakes.

[Pynoxim]

I havent lowered the compression, it is still running stock pistons, I have a monstrous FMIC so IAT are very low. Leon said that at 1.7 bar the car was pulling a couple of degrees timing. Do I need a vcds to runs logs, I have heard of people running logs but not sure at all on how to do this. I want to learn to map my own car, I have had experience with mapping stand alone ECU and piggy backs as I used to work for perfect power for a couple of years, So I understand how its done, but after researching how to do the Audis ECU it seemed very in depth and would need to spend some time with someone in the know to make sure I dont make any expensive mistakes.

It's actually fairly simple

http://www.nefariousmotorsports.com/forum/

[panic-mechanic]

1.7 bar on stock compression and 95. Dude that thing ain't just pulling a few degrees. But hey what do I know.

[THANAS]

1.7 bar on stock compression and 95. Dude that thing ain't just pulling a few degrees. But hey what do I know.

Yeah, even with the biggest cooler known to man, the octane is not there to achieve any sort of sustainable timing advance under boost. Doubt it would be more than 1 or 2 degrees btdc total advance without wmi or octane booster etc.

[Slick3349]

got any advice on how to log and see for myself. Obviously I wont rung the car on 1.7 bar without nf ultra and wmi. but it would still be nice to know what the car is doing on lower boost and then on high boost with the correct fuel.