My tuning journey with dragy results

[Ozstung]

Awesome effort Danny looking fwd to more results and analysis? Is a exhaust on the horizon to?

 

[Terry@BMS]

Main thing with any testing is to have the right test. Normally, 60-130mph is the best metric for the sort of testing I think you are trying to do. But if your private track doesn't allow that sort of speed safely, then select some similar metric that takes traction out of the equation. 1/4 mile trap speeds for example are a good alternative.

 

[Daniel Egan]

Awesome effort Danny looking fwd to more results and analysis? Is a exhaust on the horizon to?

Unsure yet. I earmarked down pipes as the only change to exhaust BUT things always change.

 

[Daniel Egan]

Main thing with any testing is to have the right test. Normally, 60-130mph is the best metric for the sort of testing I think you are trying to do. But if your private track doesn't allow that sort of speed safely, then select some similar metric that takes traction out of the equation. 1/4 mile trap speeds for example are a good alternative.

We have a local drag strip which I will use if I can't safely attain 1/4 mile times. I haven't been out to my regional sites yet to do any 1/4 mile testing as we have double demerits in place for the next week and best not to risk it.

 

[Daniel Egan]

E10/94octane results from 8 dragy runs
Have 8 runs on e10 (94 octane) in stock rwd with lsd. All runs have legal slope (+1% to +3% slope increase).

Results have differed significantly based on the road, temp, weight carried and tyre psi.

Fastest 60ft/0-60mph (2.32/4.9 secs) was with no passengers, on a slightly damp hut well sealed road and recommended tyre psi (37/39).

With a passenger these times increased to 2.36/5.1 secs and as the temp and psi rose (from 21-23 degrees to +30 and 37/39psi to 40/42psi), the times varied from 5.2-5.4 sec. Slowest times were 5.6/5.7secs when launching off a highway with some loose gravel (also +30 degrees) and when launch control wasn't used.

I'll post detailed logs and variables shortly
And am now moving onto 98 octane testing before dropping the first mod.

 

[Daniel Egan]

First runs on 98 Octane this morning, will be posting 2 more later in the day once I let some air out of the tyres.

Date - 03/01/2019
Average of 2x runs measured with Dragy

Car - GT RWD (with limited slip differential)
Mods - None
Additional weight carried - +130kg (me+almost full tank of fuel+20kg in boot - spare tyre not included)
Petrol - 98 Octane (AUS)

Measurement / Time (secs) / Slope / Best

1. 0-60ft / 2.43 / -3.89% / 2.32 (E10 - Stock)
2. 0-60kmh/ 2.69 / -2.74% / 2.65 (E10 - Stock)
3. 0-60mph / 5.00 / -0.68% / 4.91 (E10 - Stock)
4. 0-100kmh / 5.3 / -0.37% / 5.12 (E10 - Stock)

Conditions
Temperature - 25 degrees celsius
Road Type - Sealed Street
Dryness - Dry
Humidity - 90%

Car Parameters
Tyre PSI - Front 40 Rear 41
Tyres - Contisport 5
Tyre age - 11000km
Mode - Sport
Gearing - Automatic
Launch control - Yes
Traction control - Disabled

Comments
Perfect day for it. Still to much pressure in tyres. Second fastest run across all measurements since getting dragy. The only obvious variable is that the fastest runs were when PSI was 35 (Front) and 37 (Rear). All else is more-or-less the same.

Next Steps
Will take some air out of the tyres so they're 37/39 PSI (as per owners manual), possibly take 20kg out of the boot (bags of clothes donating to charity) and give it 2-3 more goes today whilst conditions are pristine.

 

[Ozstung]

You did say 98 octane didn't you? I noticed in the stats you mentioned E10 again, am I missing something, sorry if I've missed something obvious.

 

[Daniel Egan]

You did say 98 octane didn't you? I noticed in the stats you mentioned E10 again, am I missing something, sorry if I've missed something obvious.

In the stat's I listed the fastest run thus far so you can easily compare across data and see how it compares with the latest samples. E10 - Stock is listed in brackets as that was how the car was set up for that "best" run. The following format will be used for "best" <Time (octane - mods)>. Hope that kind of clarifies but I may need to visualise the data better if it causes confusion.

 

[washguy]

Hi yall so what is a good o to 60 time and where are they posted in the forum just got the dragy yesterday and tried it just now. Right behind the PoPo station
4.6 no hook up at all map 5 Wash

 

[Daniel Egan]

Hi yall so what is a good o to 60 time and where are they posted in the forum just got the dragy yesterday and tried it just now. Right behind the PoPo station
4.6 no hook up at all map 5 Wash

1. Don't know but probably not here.
2. Time depends on your mods, awd v rwd and conditions - the purpose of the data I'm trying to collect over time (albeit with a rwd). I think @Tonkabob may have dipped below 3.7sec (0-60mph) in an awd based on some dragy screenshots, although not sure if that includes a 1ft roll out. Anything below 4.5sec for a 0-100kph (4.3 for 60mph) is proper quick.
3. Believe @Tonkabob may have been looking to make a 0-60 thread like the 1/4 mile one.

 

[Tonkabob]

1. Don't know but probably not here.
2. Time depends on your mods, awd v rwd and conditions - the purpose of the data I'm trying to collect over time (albeit with a rwd). I think @Tonkabob may have dipped below 3.7sec (0-60mph) in an awd based on some dragy screenshots, although not sure if that includes a 1ft roll out. Anything below 4.5sec for a 0-100kph (4.3 for 60mph) is proper quick.
3. Believe @Tonkabob may have been looking to make a 0-60 thread like the 1/4 mile one.

Here is mine again. 3.78 no roll out, 3.59 with one foot rollout. I've seen a few in the 4.1 and even a low 4.0 Can't recall if they were awd or rwd.
If we get enough dragys and people who Don't or can't do 1/4s cause that is a bit insane, i or someone else could host the 0-60. It's certainly more approachable than doing 1/4s. ☺

 

[washguy]

Tonka that would be great to see 0 to 60's.....its hard in major cities to run a 1/4 mile......0 to 60 is still crazy but doable...and 0 to 60 is really more reflective of what street cars do in the real world redlight to redlight....lol Wash

 

[Sabz]

Hi yall so what is a good o to 60 time and where are they posted in the forum just got the dragy yesterday and tried it just now. Right behind the PoPo station
4.6 no hook up at all map 5 Wash

Wash, you try one of the lower maps since you can’t get traction ... curious what you would get on map 2 .. or 1 ...

 

[Daniel Egan]

Testing with 98 octane is complete. Compared with E10 (94) the results were underwhelming, even when reducing weight in the car by 50kg.

Testing has now become largely irrelevant as the temperature is consistently above 30 degrees Celsius which is having a big impact on 0-60mph performance.

E10
Fastest 0-60mph with E10 94 octane was 4.91 secs (+2.19% slope) whilst car was carrying 140kg (me and fuel tank of petrol), 23 degrees outside and tyre psi at 35/37. Average 0-60mph across a range of conditions, slopes, weight and temp was 5.13 secs (8 runs).

98 octane
Fastest 0-60mph with 98 octane was 5.00 secs (-0.67% slope) whilst car was carrying 130kg (me and almost fuel tank of petrol), 25 degrees outside and tyre psi at 40/41. Average 0-60mph across a range of conditions, slopes, weight and temp was 5.18 secs (6 runs).

Comments
Comparing like-for-like conditions, the higher tyre psi (35/37 v 39/40) seems to account for a +0.2 difference in time. Similarly, a 7-8 degree increase in outside temperature (from 21 to 28 and 25-33) can increase time by 0.1-0.2 seconds with all else being equal.

Summary
Although E10 proved faster, the lower tyre psi and temperature greatly helped the 4.91sec 0-60mph result. Comparing to the most similar run on 98 octane, the only difference was an increase in tyre psi (4 at the back and 5 at the front) yet the 0-60mph was still 5.00 secs. Based on data trends, this run could have been as low as 4.80-4.85 if the tyres were deflated from 40 to 35/37 psi - however, purely speculative so (temperatures permitting I can test around mid 20 degrees) I'll deflate the tyres, try once more to beat 4.91 secs and then move into the next experiment - jb4 or kn panel filters or SSR downpipe.

 

[Sabz]

I vote downpipe!

 

[Daniel Egan]

A

I vote downpipe!

Depends whether we are wanting to debunk whether the drop in filters alone have any benefit (on a stock car). Downpipe certainly will.

 

[Blitz]

A

Depends whether we are wanting to debunk whether the drop in filters alone have any benefit (on a stock car). Downpipe certainly will.

Don't be so sure. My intakes showed .2 sec 0-60 advantage and Terry runs stock exhaust and says its not as big as people think.

 

[Blitz]

Don't be so sure. My intakes showed .2 sec 0-60 advantage and Terry runs stock exhaust and says its not as big as people think.

I would do it in order of EXPECTED gains. drop-ins. downpipe. intake. JB4?

 

[Daniel Egan]

I would do it in order of EXPECTED gains. drop-ins. downpipe. intake. JB4?

That was the plan, along with potentially the sway bars. Although I'm not sure on the intakes if I go the drop-in route (potentially with a velossa big gulp intake funnel things).

 

[Blitz]

That was the plan, along with potentially the sway bars. Although I'm not sure on the intakes if I go the drop-in route (potentially with a velossa big gulp intake funnel things).

I think intakes are a pretty large upgrade personally from my tests. That's all I can really say. If I had limited budget I would skip the drop-ins. I don't think they are going to do much at all.