13.5 @ 110mph explained. Options

[AWD DSM 1]

Ancient Chinise proverb says...

Make sure the tank is full of gas before trying to drive

[mitsu90]

good deal, at least you know why yours was running so shitty.

[hammar]

Since there are doubters, I have called out Hammer (who ran consistant 11.30's @ 120+ mph.)

Hey, how come I got lumped in with the doubters?

Spy, I'll be your huckleberry.... gimme a few to get the exhaust back on her and then you're all mine....

[Turbo Tension]

I don't understand this tuning for race gas. Put it in, push the gas, go? That's all I've ever had to do

[Booztd 3]

I don't understand this tuning for race gas. Put it in, push the gas, go? That's all I've ever had to do

Increase timing, pull some fuel out of the maps, kick up the boost?

[awd4kicks]

Race gas is more stable than pump gas. In otherwords it burns slower. So unlike many old timers and advertizers would have you believe, race gas alone will not make your car faster, but slower if your not taking advantage of it's higher octane. To utilize higher octane you either need to turn up the boost or the timing.

Netter, if your already running lean or high on knock simply adding race gas WILL help. That's how I got to the 12's, but I also cranked up the boost even beyond my normally high knocking boost levels. If someone were so inclined to have a computer that automatically adds timing for higher octane that would make higher octane work without extra tuning.

Otherwise, If race gas is added to an already stable tune on pump gas, you will not do yourself any favors gaining acceleration.

Make sense?

[mitsu90]

what if I was already pig rich and added some 110. and didn't have a full tune?

[awd4kicks]

Then you made it slower...

[mitsu90]

that make me feel better.

[hammar]

what if I was already pig rich and added some 110. and didn't have a full tune?

I stopped hitting the 'race pump' last year and can pretty much count on running consistently now. This weekend's runs:

11.244@121.38
11.254@121.01
11.334@120.66 (stalled after I staged and still pulled a 0.011 light)
11.372@120.9
11.582@119.08 Driver error, up shifted to OD _way_ to early.

11.526@101.77 (bracket racing, I was on the brakes trying not to break out... still lost)
11.887@96.83 (coasted to the win)
13.44@82.88 (coasted to the win)

I often wonder if a lot of our super high strung turbo cars would be completely different animals if their owners/tuners ran them at 95% instead of 101% on race day?

Hammar

[hammar]

NO, Hammer isnt one of the doubters.
Hammer has a performer, thats why he was selected.

I should have run it through the pipes this weekend. I'm still not sure how much corking it up hurts me. It was only 30-40hp on the dyno, so it shouldn't be all that bad right?

Hammar

[mitsu90]

what if I was already pig rich and added some 110. and didn't have a full tune?

I stopped hitting the 'race pump' last year and can pretty much count on running consistently now. This weekend's runs:

11.244@121.38
11.254@121.01
11.334@120.66 (stalled after I staged and still pulled a 0.011 light)
11.372@120.9
11.582@119.08 Driver error, up shifted to OD _way_ to early.

11.526@101.77 (bracket racing, I was on the brakes trying not to break out... still lost)
11.887@96.83 (coasted to the win)
13.44@82.88 (coasted to the win)

I often wonder if a lot of our super high strung turbo cars would be completely different animals if their owners/tuners ran them at 95% instead of 101% on race day?

Hammar

nice runs

I was pig rich when I showed up. put it some 110 had ncgalant reburn a chip for me,only one cuse I almost broke it taking it out and we had no extra ones.

[wortdog]

what if I was already pig rich and added some 110. and didn't have a full tune?

I stopped hitting the 'race pump' last year and can pretty much count on running consistently now. This weekend's runs:

11.244@121.38
11.254@121.01
11.334@120.66 (stalled after I staged and still pulled a 0.011 light)
11.372@120.9
11.582@119.08 Driver error, up shifted to OD _way_ to early.

11.526@101.77 (bracket racing, I was on the brakes trying not to break out... still lost)
11.887@96.83 (coasted to the win)
13.44@82.88 (coasted to the win)

I often wonder if a lot of our super high strung turbo cars would be completely different animals if their owners/tuners ran them at 95% instead of 101% on race day?

Hammar

Indeed Hammar.

I made about 20 passes two weekends ago at Bowling Green, KY with the brick, and every one of them was between 11.80 and 12.05 @ 114-116mph. Had the boost just a little above normal street levels and an actual tune(11.8-12.0:1) instead of pig rich(10.5:1). Probably would have been 11.60-11.80 if my trans wasn't slipping in second. 60fts in the 1.62-1.68 range.

All on pretty purple colored 110 race gas.

Turbo cars can be consistent too.

[Turbo Tension]

116 is nice, but for peace of mind running in street trim Xylene owns me.

[wortdog]

The Xylene mix at 33% by volume bumps you to around 100 octane if you start with 93. Anymore seems to not have much effect.

110 was only $3.75 a gallon in Kentucky.

[hammar]

Indeed Hammar.

I made about 20 passes two weekends ago at Bowling Green, KY with the brick, and every one of them was between 11.80 and 12.05 @ 114-116mph.  Had the boost just a little above normal street levels and an actual tune(11.8-12.0:1) instead of pig rich(10.5:1).  Probably would have been 11.60-11.80 if my trans wasn't slipping in second.  60fts in the 1.62-1.68 range.

All on pretty purple colored 110 race gas.

Turbo cars can be consistent too.

That thing just rips.... I luv the T-types/GN's

[NOMIEZVR4]

Marcus, you stated that with higher octane..race gas, you need to either turn up the boost or the timing. Now the boost, is raised via the mbc.

But the if we want to add timing, we do it via the CAS? How much more timing is one supposed to add? Sorry im kinda new to the timing stuff..

[Booztd 3]

I dont know how DSM's work because they typically run more timing than other cars, but I usually add 4-5 degrees of dynamic timing and then work from there.

By dynamic timing I mean the timing thats controlled by the computer. I usually do not mess with timing below 4000rpms as well. You set (base) mechanical timing by adjusting the CAS. You can probably control the timing maps by having a eprom burnt especially for. Do AVCR's allow you to adjust timing?

[awd4kicks]

<--JMoushon

Yes, the base timing is adjusted via the CAS. I used to turn up the boost to a level that I thought was reasonable, then use the CAS and AFC to tune it from the base point. On race gas, it usually liked about a 6 deg bump on the base timing and -15 to 18% on the fuel side.

[hammar]

Betta pack a lunch tomorrow Spy-d-guy

[Booztd 3]

Betta pack a lunch tomorrow Spy-d-guy

Lets turn this into an evo gang bang

[awd4kicks]

<--JMoushon

Yes, the base timing is adjusted via the CAS.  I used to turn up the boost to a level that I thought was reasonable, then use the CAS and AFC to tune it from the base point.  On race gas, it usually liked about a 6 deg bump on the base timing and -15 to 18% on the fuel side.

When I mean bump up the timing I mean by a more finite method such as an AEM EMS or by burning custom maps in an EPROM. I wouldn't suggest cranking up the timing by the Cam angle sensor. I have done it and it does help, but it also burns up pistons and valves in the blink of an eye.

[hammar]

rx7- 1 200lb passenger, and -50hp from exhaust being non open, on a slick.

Twitch, full tank of gas, 27psi, excellent launch.


Hole shot, twitch ahead by 2 cars. End of quarter (120-125mph) Twitch held the lead with one full car ahead.


Rx7's launch... Not a 1.6, but didnt fry them either.. Decent.

Seat of the pants, guestimation... 11.50-12.0 run.

Ya got me today, but I'll be back