Monty’s Single Turbo -> Back to Twins (Compound)

[Monty23]

Damn man... That's really impressive. Love the powerband you have there. Can you post acceleration graph with that?

I'm looking forward to your track outing on the 3rd!

Sure thing

Here is the same tune with and without meth (straight 93 pump vs 93 pump + boost juice (865cc/min@150psi))

[WikiWiki]

wow, and thats not even with a revision- looks like meth is mandatory for the stk

[britishturbo]

Sure thing

Here is the same tune with and without meth (straight 93 pump vs 93 pump + boost juice (865cc/min@150psi))

This is a really good example for people.
If you look close you'll see why the difference - with the meth there isn't the knock, so the ecu isn't pulling the timing.
When your combustion pressures aren't knock limited like pump gas is to a big extent you make large gains from the extra timing you can run.

Any system will benefit from Meth, not just an STK.
Anyone taking bets on what my car will run with the meth? I'm already at 2.6 fats without it lol

[britishturbo]

Meth injection + unmodified pump gas tune (high 10s AFR) = 2.69 FATS
Stayed tuned for meth tune results......

The meth specific tune won't have the ramp up of boost, it will go right to full boost... plus will have less fuel.

[Monty23]

The meth specific tune won't have the ramp up of boost, it will go right to full boost... plus will have less fuel.

Guess I better get my zeitronix warning alarm installed lol

[britishturbo]

Guess I better get my zeitronix warning alarm installed lol

The safest way to do it is to use the wonderful "Map Switching" code made by the uberfantabulous phila_dot (Props should always be given to those who make cool shit )
This way if you did run out of meth you could just switch to the non meth settings.

[Monty23]

Yes I agree. But I was thinking more along the lines of if my meth stopped working and my AFR/egt skyrocketed lol, my zeitronix could tell me and pull boost to wastegate pressure....

[britishturbo]

phila_dot also just pointed out that if we get an inline flow sensor we could implement a true fail-safe into the code and switch maps if something would happen

[AudiSportB5S4]

Anyone taking bets on what my car will run with the meth? I'm already at 2.6 fats without it lol

2.599. Aim low, be pleased when it surpasses low expectations. Lol...

[britishturbo]

2.599. Aim low, be pleased when it surpasses low expectations. Lol...

Haha well the car is mostly stock so sub 4 would be good

[Monty23]

phila_dot also just pointed out that if we get an inline flow sensor we could implement a true fail-safe into the code and switch maps if something would happen

Couldn't we set the failsafe based on actual AFR? no added complication to the system ( and less places to leak/hardware to fail)...

[britishturbo]

Couldn't we set the failsafe based on actual AFR? no added complication to the system ( and less places to leak)...

phila_dot and I have talked he feels (I agree) that using the windeband signal isn't reliable enough alone...

[Monty23]

Makes sense.

http://www.summitracing.com/parts/avm-35-2126

Not bad, $100 to add a failsafe, although I know you don't like AEM products....

[britishturbo]

Makes sense.

http://www.summitracing.com/parts/avm-35-2126

Not bad, $100 to add a failsafe, although I know you don't like AEM products....

I think you need the gauge to get the actual 0-5V output...

[AudiSportB5S4]

I'm confused with that accel graph... You were only pulling .25 G at the end the pull without meth?? Were you going up a hill? K04 cars pull harder until redline, and you are most certainly pulling harder there.

Haha well the car is mostly stock so sub 4 would be good

Here is stock... These cars come a very long way with all the work we do to them...

[Monty23]

I'm confused with that accel graph... You were only pulling .25 G at the end the pull without meth?? Were you going up a hill? K04 cars pull harder until redline, and you are most certainly pulling harder there.

You know what, now that you mentioned that, I never played with the ecuxplot vehicle profile settings (still default).... I wonder if that has anything to do with it?

[Monty23]

So here is my accel graph with the default vehicle profile settings






Then I typed in the proper RPM per MPH and got this:



EDIT: Nope I am wrong, this graph is not correct!

[britishturbo]

Here is stock... These cars come a very long way with all the work we do to them...

Haha my car was never stock in my hands

[britishturbo]

So here is my accel graph with the default vehicle profile settings






Then I typed in the proper RPM per MPH and got this:

You sure that number is right? Where'd you find it?

[SpeedWorksAuto]

I had to do the same thing for my setup. I had to get a tire size calculator, and a gear calculator and input the numbers. I tested it by using stock numbers and the calculator spit out very close numbers to what ecuX has for a stock s4 profile. I ended up around 67.4 for RPM per MPH with my 19" wheel tire setup and my 2.8 third gear.

[mightemouce]

phila_dot also just pointed out that if we get an inline flow sensor we could implement a true fail-safe into the code and switch maps if something would happen

That is effing amazing! I need to go read into this more

[britishturbo]

So here is my accel graph with the default vehicle profile settings






Then I typed in the proper RPM per MPH and got this:

I get 68.11 for 3rd gear with 225/45 17 tires.

Which actually changes my power output estimations to exactly match Virtual Dyno

[Monty23]

You sure that number is right? Where'd you find it?

Not even close lol.... checking through my logs and various revs/vehicle speed gets me a range from 69-71.5 in 3rd gear....

[britishturbo]

Not even close lol.... checking through my logs and various revs/vehicle speed gets me a range from 69-71.5 in 3rd gear....

lol

http://www.wallaceracing.com/gear-speed.php

[SpeedWorksAuto]

I get 68.11 for 3rd gear with 225/45 17 tires.

Which actually changes my power output estimations to exactly match Virtual Dyno

Changing my RPM per MPH definatley changed my CALC whp etc, it also made me realize that comparing FATS times to you guys was pointless for me.

[SpeedWorksAuto]

lol

http://www.wallaceracing.com/gear-speed.php

Yup, thats the one I used.

[Monty23]

Here is what the Mark P acceleration graph looks like for my 2.69 FATS run.
Mark P FATS calc also says this was a 2.71 run.

[britishturbo]

Here is what the Mark P acceleration graph looks like for my 2.69 FATS run.
Mark P FATS calc also says this was a 2.71 run.

Damn that mark P lol

[Monty23]

By the way my boost profile currently looks, I should see 30psi @ 4100rpm.... I'm so excited to try this out and see how this feels!

BT - do you think I should run a stiffer WG spring? I have the 1 bar spring set now.

[britishturbo]

By the way my boost profile currently looks, I should see 30psi @ 4100rpm.... I'm so excited to try this out and see how this feels!

BT - do you think I should run a stiffer WG spring? I have the 1 bar spring set now.

I just upgraded my spring... it now only takes 20% WGDC to hit 30 psi lol.

Basically you want the spring to be set to the lowest safe boost you ever want to run, and usually should not be less than 50% of your max desired boost...

I have around a ~21psi spring now... should just work for my goals

[Monty23]

Just to clarify some things. The camera car was the Ko4 car. Race 1 Monty23 misses 4th. Race 2 B5A4GT28 miss 4th.

Ko4 car
Pj ko4's
034 tuned
awe intercoolers
rs4 y pipe
23/24 psi. (AWE gauge was being exchanged at the time of the race.)
blah blah blah

STK car
Precision PT5858
DM forged drop in rods
BritishTuning
25 psi
blah blah blah

Neither car has meth and both on 93 octane.

[Don Supreme]

Good stuff.

[AudiSportB5S4]

Here is what the Mark P acceleration graph looks like for my 2.69 FATS run.
Mark P FATS calc also says this was a 2.71 run.

Wow man, I love where all that acceleration comes from.. Car must feel real good!

[SpeedWorksAuto]

Looks like you will be really close on a 605 car. My buddy raced a 605 in his pretty well sorted k04 car and it was almost like watching this race.

[NOTORIOUS VR]

^^ Looks like that 605 car is a little stronger then the 5858 car IMO...

But great races for sure.

[SpeedWorksAuto]

^^ Looks like that 605 car is a little stronger then the 5858 car IMO...

But great races for sure.

The 605 in this video was running 100% meth also. I was thining Monty's car would be a bit closer with Meth now.

[Monty23]

Meth is quite the little go go juice. Here is meth base tune. Nice midrange toque bump!

[NOTORIOUS VR]

Very nice!

[Monty23]

PT5858 boost profile @30psi

[034Motorsport]

Typically you want to run about a wastegate spring that has a pressure of about half your maximum planned boost. 1BAR spring will support 30psi no problem, but over that you may start to push open the wastegate. A lot of this depends on backpressure and such, as the pressure differential on both sides of the WG will determine whether it opens on its own.

You also don't want to run too high of a WG spring, or you will be using you WG excessively.

As I mentioned in the thread of the K04 vs STK, good stuff. Car is really coming together and I bet you are very happy. Makes me miss my STK a lot. =(