urbamworm

I don't have a drag radial setup so I would have to look in to something, I just don't know if I can justify spending near $1000 for something I would use only a handful of times. If the track was local it would be totally difference because then I would probably go often but it is over an hour away. I will just get some good soft tires for my next set on my 19s and hopefully that will help more.

Yeah, that is the tool I use to find DA. I go to Gainesville raceway, I checked their schedule but it only shows the rest of the year and I can't remember when they open up for the year but want to say it is in February, it is hit or miss if there is cold weather or not here then because by the end of February people are at the beach already.

The timing is advanced quite a bit from a tune for pump gas and race gas burns cooler and definitely can help when the engine sees no inaudible knock therefore not pulling any timing. It goes off more than just an intake air temp reading for timing adjustment so race gas can fight against even the heat of a hot day to still keep performance up more.

GT-ER

race gas doesn't burn cooler, it burns slower. Advancing timing is what lowers egt's when using race gas.

Hammer Down

Here is what you do, go onto eBay and look for 17" wheels for a MB, type in 17" 5x112 and find you a set of wheels for $100 or so then search for 275/40/17 MT drag radials and it may run $420 and there you go.

gaspam

thats what i thought....and slower burning would equal lower piston pressure right so lower hp if timing is not advanced to take advantage of higher octane correct?

if our cars are tuned to 93 octane than any higher octane used in the car without timing advancement beyond what would cause detonation at 93 would result in lower piston pressure due to slower burn of the higher octane right ?

i have always been told that race gas without advancing the timing beyond pump gas tune is pretty much worthless due to this slower burn/ lower piston pressure.

AWOL

I built my "drag pack" suing tire rack for ~500 shipped and mounted I believe.

16" rims, 16" bfg dr's

urbamworm

Dang, I didn't realize you could get 2 wheels for $100, but don't you have to run spacers also or is that for the 16" wheels only? Thought I remember reading longer lug bolts and spacers were needed for guys doing drag setups with the smaller oem wheels off other models.

And I assume you mean find some used drag radials since they showed up as $230ish each on ebay and google searches? Aren't the Hoosier drag radials much lighter though, pretty sure I read that on here once? Seems like it would be a better idea to run those unless they don't work as well for some reason and I also came across another drag radial by M&H not sure on the weight of them, ever heard of someone using those?

urbamworm

Here you go click me to see it cools things down

gaspam

thats just VP racing saying "their" fuel runs cooler than others...

in reality The higher the octane, the harder it is for the fuel to ignite. The only time you will see a cylinder temp. drop is when you run a richer mixture or have a better than stock cooling system. In general terms...the more FUEL you put in it, the cooler it runs, NOT the more OCTANE.

theoretically the only reason it could be concieved as cooler would be bacause of the cylinder pressure drop from the slower burning race fuel... which is great if you are advancing your timing beyond the predetonation levels of 93 octane fuel, but as far as i know none of the tunes out there for our cars are switchable to race fuel file, so the tunes would be for timing advancement allowable for 93 octane... so any octane level used beyond that is going to burn slower and thus have lower cylinder pressure (ie less force= less hp)

tbal

Urbam...

I have 2 e500 17" 5 spoke rims if you want them, their yours, just cover the shipping. I believe they are 17x8

Im using 2 aswell with a 275/40/17. No spacers, perfect offset

urbamworm

Race fuels are oxygenated with ethanol/methanol/alcohol whatever word you want to use and those have a higher latent heat of evaporation which cools better, they have much higher levels of this in them than regular pump gas therefore they cool better.

urbamworm

Sweet! A pay it forward type deal, I remember looking through a thread for that a long time ago

Like these? You don't live on the other side of the world do you? Shipping could get expensive haha.

gaspam

its been done before, but go do a dyno run on pump fuel and then same day same dyno, do a run on race fuel without changing the tune at all and see the results... there will be no change

Octane level has no bearing as to the temperature of the burn. The oxygen level of the A/F mixture will dictate the temp so if you are advancing timing beyond the current advancement in your tune for 93 oct and can get more fuel in the cylinder from that then it will run cooler but thats not from the higher octane race fuel... its from the extra fuel but if you are not changing your tune your not getting any extra fuel

urbamworm

Why do you keep referencing octane? The fuel has alcohol in it and that is what pulls out heat.

I have run pump gas in my Audi and it would show correction factors via vag com and pull timing and then put in some Sunoco GT100 and had zero correction factors with absolutely nothing changed. And no I wasn't running some aggresive tune, it was with Revo programming which you should know does not run much timing.

gaspam

the sunoco GT fuel is 9% ethanol which is pretty much the same as pump fuel... thus no difference in cooling effect of race fuel for that reason either

you can put race fuel in all day long but unless you change your timing and a/f its not doing anything except costing more

urbamworm

Ok I have logs showing the car running more timing since the correction factors went to zero after putting the race gas in, that example was to show that race gas makes a difference when you aren't putting it in a stock tune car.

But you are right, I am wrong lets move on now the back and forth isn't accomplishing anything.

GT-ER

It's the first time I read such a thing ( the cooling effect ) but that's besides the point.

If your car is pulling even the slightest bit of timing due to knock ( which I'm sure most people here are ) then putting race gas will make more power. If you car is not pulling a single degree of timing due to knock, then you shouldn't make any power unless you tune. I've tried it both ways before on the dyno and have seen both results.

urbamworm

New best tonight of 11.69@120 with 1.82 60ft still on street tires, DA was 538ft. Track prep was garbage from nobody showing up so I had mostly all 2.0 range 60ft times and four 11 second passes out of 13. They cleaned the starting line right before I did my 11.6 run and then the very next time up and the rest of the night it was spinning again. So frustrating, no clue why nobody showed up on the first cool night of the year and there are only 2 more test n tune days before they are closing early for the year probably because barely any cars are showing up.

Was the fastest car at the track all night though minus one run from a race car that did 11.4x. Beat up on a Mustang Cobra too a few times, the guy said it had 480whp and 506tq, he had Nitto Nt555 tires but they were kinda wore out. He was getting like 1.9x 60ft times too. Closest run we had was me running 12.03@120 and him a 12.19@118.6, I had a 1.98 60ft and he had a 1.95 60ft.

It was still fun but a little depressing when you cant get on the gas at all taking off, even rolling off the line and then thinking ok now I can floor it still causes me to spin.

AWOL

nice work

AKnight55

Yup, thats how it works.. Its all about track prep and 60' times or you mine as well just be going for trap speeds..

urbamworm

Kinda disappointed in my traps too, not sure why I am not trapping slightly higher.

AWOL what mods do you have with 121.5 trap, I see stock pulley so assume you must have something else or would have listed stock instead of stock pulley?

AWOL

I had mail Eurocharged tune, VRP shorty headers, and stock tb grind

pullejo

Dang - I was really really really hoping to make it into the 11's tonight on my stock tires. Sounds like it's a lot harder than I thought. And this will be my first time making any runs.

Doing the Year One Fast Fridays thing at Atlanta Dragway tonight.

urbamworm

If you have regular street tires and nothing fancy like the drag radials or road race tires it is highly dependant on how they prep the track. You have a lot better chance with those tires but even still could have problems with them if they don't prep at all. If they clean it good and put down a lot of VHT then you will be able to grip pretty good but if not then you are screwed big time. You will still need to ease in to the throttle off the line for a split second before stomping it though even if it is gripping good.

pullejo

Well...didn't do it either. Just couldn't hook. But it was a BLAST!

Best - 12.092 @ 117.95
Best 60 - 1.957
Best r/t - .716 (awful)
Trap - 118.69

Beat 2 cobras, 1 neon srt/4, camaro 585 (12.806), g8, new 5.0.

No one was anywhere near me though honestly. It was laughable actually...and I was severly disappointed. Just couldn't hook up for the life of me.

I have videos of them all but spanking that beast of a camaro was my favorite. People were swarming the car.

AKnight55

^^^^Id figure youd be over 120 mph trap with all those mods.. Maybe in cooler weather though, you will get up there..