4 Point 0

Yes it is. I wonder how much they used?

I’m only on 50/50 mix. E85/93.

What tyres were they using?
I think slicks as a great time but low MPH for that time.

Good job anyway. What was the 60ft?

Post slip please.

spdracerut

They only run the full e85, no watered down. Vid and timeslip are on their Facebook page. Stock tires but the track looks VERY well prepped. Probably have your shoe come off walking across the lane.

Cheshi143

The APR TCU tune has the 1-2 shift looking real sweet. Track prep looked pretty basic to me.

spdracerut

He cut a 1.62 60' on stock tires that have a few track days on them. On the launch and the 1-2 shift, barely a peep out of the tires. The surface was very sticky. A 1.8 would be more typical.

PTS-BRG

Guys we’re now getting into a far different situation than just a tune. You got a Carrera T which is the lightest of all of these Carreras. They are putting on bigger turbos with intercoolers and running E85. This isn’t a Cobb vs APR Tune, this is a modified super light stripped down car running race fuel and bigger turbos. Let’s keep it apples to apples.

4 point 0: if you ran 10.88 using even a drop of E85 to get your 10.88 then you cheated. My run was purely pump fuel on a local roadway non prepped track.

B Russ

Yeah this is not what the thread was intended for.

thesaintusa

Sorry for my ignorance, but what did you run PTS-BRG? GTS? 91? 93?

It would be nice if both COBB/APR/Softronic were comparing apples to apples and only using either 91 or 93 octane tunes.

E85 is not available where I am, so I (like many perhaps) would only be interested in what a 91/93 tune can do.

I don't mind a Base/T running GTS turbos (that is effectively a GTS powerplant, albeit lighter), so you can at least see what a GTS does on 91/93.


That being said, it is nice to see how fast the 991/2 GTS can run on E85 for those that have access to it.

PTS-BRG

I’m on east coast. The only fuel I run is Sunoco 93 octane with a tune made for 93 octane. No fuel additives, no race fuel, no E85. My car has the standard bolt ons and tune. Headers, cats, exhaust and tune. I haven’t stripped it down, it’s the heaviest Model by far, a full glass Targa and I have another 50lb subwoofer in the back too. Only weight savings are HRE wheels but that savings is offset by my 215lb fat ***.

Jeahbladejeah

Rule of thumb for T owners: you don't have to stop eating cheeseburgers until you're too fat for the carbon buckets. 6'2", 235, going strong.

911.

The weight from a Base/s/gts that is similarly specd is negligible. Because you have a targa and other things that add weight is of no concern to anyone else if you are here trying to compare 1/4 miles times... You can remove all of that. Additionally, when people compare a platform its either stock or vs bolt ons, that includes a stock engine with other modifications. Tune is part of that also.

The original post was in reference to 4.0 slip at the 1/4 mile with a 10.88 pass. Which is modded, running a corn mix for fuel. I would say it was apples to apples.

Nabil_3.0

@M Engineering Mitch we have to step up our game LOL!!!!

PTS-BRG

911.: If you think 700lbs of additional weight is negligible then you are unaware of how speed and acceleration works.
If you also think that running an enriched fuel compared to pump gas is apples to apples then you are also unaware of the advantages of octane.

Google is your friend here.

911.

What my posts says is that, a base carrera vs a carrera s that is similarly spec'd is like 35 lbs and vs a GTS is maybe 140lbs. But most of that weight o the GTS is the hardware bolted to the engine which a Base or Carrera T in our example also has... so for comparison purposes its apples to apples. It your fault for getting a targa if you are looking at 1/4 mile times. And your fault for having a 50lbs sub... thats all I am saying.

I dont know where you got 700lbs from but I took your advice and used google, C4GTS = 3285 (PDK) and C4GTS Targa = 3483 (PDK) looks like under 200 there, vs a CT = 3142 (11lbs lighter than a base Carrera) is 341 Lbs. I will agree with you on fueling since you didnt see that 10.88 run was on a drag strip with ethenol mix. But you can do that too, if you wanted.

You are also complaining that their cars are fully modded, when in reality yours is too... I dont get your logic here. Actually you seem to have more bolt-ons as the APR only has a tune and intercoolers. A Carrera T with 'bigger turbos' is a GTS for arguments sake.

PTS-BRG

C4GTS- 3285
C4GTS Targa 3485
Carrera T 3142

Now you ask where the 700lbs comes from on MY Targa..

345lbs is just the difference in curb weight from the Targa and Carrera T
65lbs is difference from me and 150lb rider
25lbs full tank of gas
50lbs front axel lift
50lbs subwoofer

And I ran a 10.88 on the street with 38lbs of tire pressure (way high) and a mis shift from 3-4th gear
Thats 500lbs difference from my car to a Carrera T. But, lets leave my car out of this equation.

The Carrera T weight vs GTS weight is 140lbs. I disagree that this is bolt on engine parts as bigger turbos weight ounces more than smaller ones. Even if they are 2lbs heavier its negligible. You cannot compare a car that is 140lbs lighter and running E85 on a prepped race track and say that its a fair apples to apples comparison to a 140lb heavier car running pump gas on the street. The times are significantly better with the APR car and tune because it is lighter, is running race fuel and was timed on a prepped track where tire spin is minimal and speed conditions are optimal.

A 10.88 vs a 10.48 is 4 tenths a a second faster and while that is a lot in the racing world, the aforementioned advantages it had doesn't mean the tune was better. Both cars could have had identical tunes and the APR would still win on weight, fuel and track conditions alone.

4 Point 0

Agreed. 🤣

However, I don’t want to start a flame war with APR, but there is a very good reason why i have only run 50% E85 in the tank and no more yet.

E85 needs at least 30% more fuel pumped in.

If you run 100% E85 without increasing injector size or Port injection, you will run as lean as ****. Whilst you may get away with that for short 1/4 mile busts. Eventually you will go BANG!!! So this was a 1/4 tune. Run 100% E85 without the ability to add more fuel and you will blow your motor.

I’m a track rat. I’m not interested in an1/4 mile tune. My car has a bullet proof tune. I run laps all day, and i visit the track frequently when not locked down lol.

I wouldn’t advise anyone to run 100% E85 without extra duel system. It will end in tears.

Just my opinion. As you can see from my mods, I am a crazy ****. But even i know not to go 100% E85 until I have port injection.

Too many M3/M4’s went POP!!