[Helix Wildebeest]

Figured it was worth a thread of its own. The only speed mod was the Attache`. The first run was 93 octane. Then we put in some 103 oct. and the traps went up. A 113mph trap speed is equivalent to right around 400whp. See below.

[revah2]

putting my suit on.
I had a real good feeling about this tune $795.00- GG procede and Xede
Just curious about what it was trapping without the 103 octane.

is there any way you can enlarge them?

[zenmaster]

Originally Posted by SpaRTan8

Then we put in some 103 oct. and the traps went up.

Does this mean you are relying on the knock sensor to tune the car?

[revah2]

I'm seeing 109 and 111 trap speeds on the two left-most tickets- is that with or without the 103 octane

[BoostedBMW]

I just want to know what it ran on 93... was that the 12.8 run?

[revah2]

um, bump.

[1clean335i]

thats a nice trap speed!

[Evo8MRto335I]

I might need glasses to look at the timeslip but correct me if I am wrong, is the far right timeslip showing a 60' of 2.4ish?
I think the car is capable of more, perhaps mid 12's. If you could perhaps make the attachemnet bigger then we could elaborate more on the runs.

Good runs by the way!

[TurboBullett@Ambient Thermal Management]

car ran 12.8@109 on pump gas with 2 gallons of 103 the trap increased to 111 then on the 3rd run 113mph. the ET's got slower(wheelspin on street tires) as the track surface got colder and the power increased from the octane.

[NYCGarbagePrince]

looks like you pulled a 113 trap by rolling off the line in 1st. Shiv put down a 110 or a 111 a while back by rolling off the line. However the 12.8 is fantastic looks like a 1.9 60'. Nice job

[TurboBullett@Ambient Thermal Management]

Originally Posted by zenmaster

Does this mean you are relying on the knock sensor to tune the car?

we are modifying the timing and boost schedules on the attache but any modern fuel injected car will auto advance timing to a point with increased octane.

[TurboBullett@Ambient Thermal Management]

Originally Posted by NYCGarbagePrince

looks like you pulled a 113 trap by rolling off the line in 1st. Shiv put down a 110 or a 111 a while back by rolling off the line. However the 12.8 is fantastic looks like a 1.9 60'. Nice job

it wasn't a roll lol more like a tire melting take off... the track was prepped horribly with the grooves coned off(for the gamblers), street tires and cold weather make for crappy 60 fts. no excuses as i wasnt expecting much out of the ET's with the street tires and track prep.

[zenmaster]

Originally Posted by TTurboBullett

we are modifying the timing and boost schedules on the attache but any modern fuel injected car will auto advance timing to a point with increased octane.

I understand that all modern cars run on the edge of detonation to get the most power from the gas. But as the stock 335i would not make that much noticeable power when switching from 93 to 103, it begs the question of the piggyback running excess timing advance. I'm not an expert, just never seen that kind of response with just a change of gas.
nevermind: I see you had the settings changed on the piggyback...

[TurboBullett@Ambient Thermal Management]

Originally Posted by zenmaster

I understand that all modern cars run on the edge of detonation to get the most power from the gas. But as the stock 335i would not make that much noticeable power when switching from 93 to 103, it begs the question of the piggyback running excess timing advance.

we didnt go from 93 to 103 as we added 2 gallons of 103 to about 4 gallons of 93. the traps increased partly due to the slower short track times as well as cooler air as the night went on in addition to the increased octane. I have not heard or logged one bit of knock on the car as of yet and have not thrown one dtc or code as well. in my experience tuning turbo cars i have seen a 20-50 hp increase depending on the setup and fuel used.

[zenmaster]

Originally Posted by TTurboBullett

we didnt go from 93 to 103 as we added 2 gallons of 103 to about 4 gallons of 93. the traps increased partly due to the slower short track times as well as cooler air as the night went on in addition to the increased octane. I have not heard or logged one bit of knock on the car as of yet and have not thrown one dtc or code as well. in my experience tuning turbo cars i have seen a 20-50 hp increase depending on the setup and fuel used.

I believe it. There are a lot of factors involved in a run and it would take many trials to actually isolate what the gain was from octane alone.

[TurboBullett@Ambient Thermal Management]

Originally Posted by zenmaster

I believe it. There are a lot of factors involved in a run and it would take many trials to actually isolate what the gain was from octane alone.

not just octane but fuel quality as well my S4 would pick up 35whp with no timing changes when running a few gallons of toluene mixed w/ 93 octane. and on the SPFWD race cars I have worked on would pick up 50+whp when running VP Import fuel over C16. as you may know if you have tuned factory engine management there is usually a base timing map this is where the car generally tries to run if a lower octane fuel is used or the ait's/coolant temps increase the timing may drop back to the low octane map. likewise if the aits and coolant temps are lower and the octane is increased the car can bump up the timing several degrees and in some cars switch to a high octane map. the difference in timing from the low octane map to the high octane map can be a swing of 10-15 degrees in some cases.

[TurboBullett@Ambient Thermal Management]

bigger timeslips


[IMG][/IMG]

[sflgator]

Originally Posted by TTurboBullett

bigger timeslips


[IMG][/IMG]

Well, see this is all a bit misleading; with the larger timeslips that you can actually see, it's obvious that the 113mph trap was with the horrible 2.4x 60ft. and 13.5x sec. ET. The decent 12.8x sec. ET was with a 109.x mph trap speed and 1.9x sec. 60ft...all very good btw. So, what's the moral of this experience...that higher octane race gas really does wonders for these cars?

[e90AW335i]

Nice stuff....keep us updated on everything concerning this new piggyback

[DrDomer]

Impressive. Looking forward to more info. What boost did you say you're running?

[TurboBullett@Ambient Thermal Management]

Originally Posted by DrDomer

Impressive. Looking forward to more info. What boost did you say you're running?

the boost is "tuned" to run 11-13psi.