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Old 05-07-2016, 09:15 PM   #1
Motorboy8769
 
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Launch high and work down? Or low and work up?

I made a couple passes at a test and tune with the slicks in the back started a 15 psi and 4000 rpm it bit good and bogged so I went to 18 psi and 4000 and it bit good didn't bog as much.
I want to find a good Rpm and pressure combo to be able to dump the clutch and get some spin and no bog.

So I am thinking go high like 5-5500 and spin then work my way down to keep from breaking parts. I'm just afraid if I go to 5k+ and it does hook I'm going to be sol! Haha the slicks are Hoosier 28x10. 4.10 gears and 1400 axles. I don't want to run to much pressure in the tires but maybe 20psi?
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Old 05-07-2016, 11:07 PM   #2
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I've been running the Hoosier 28x17 (but am auto) and have had them anywhere between 18-23 psi.
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Old 05-07-2016, 11:46 PM   #3
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Ok I may go up a bit then. Any handling issues with pressure up to 23?
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Old 05-09-2016, 03:47 PM   #4
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The more tire pressure I run the better they handle.

I like working up with respect to launch FWIW.
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13.15@106 1.95 | 100% Stock
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12.06@113 1.70 | + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune
11.84@115 1.59 | + 3.91s + Race Star 17x7 Fronts
10.90@125 1.47 | + GPI VVT Cam + BW Ported Heads + CD 3800
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Old 05-10-2016, 07:33 AM   #5
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Laugh now but what is FWIW? I'm thinking with 20psi after my 2 passes im going to be 4500-5000 does that seem to high?
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Old 05-10-2016, 08:59 AM   #6
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Laugh now but what is FWIW? I'm thinking with 20psi after my 2 passes im going to be 4500-5000 does that seem to high?
For What It's Worth... I leave around 5200ish with a drag radial. With a slick I would leave at 6000 min if the rear and driveline would take the abuse!
Unless you make huge power your not going to spin a 28 x 10 Hoosier. Don't worry about blowing them off.

Back in the 4th gen days I would leave at 6000+ with a 28 x 10 Hoosier, and most of that was grudge / street racing (no prep).

You will be fine IMO.
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Old 05-10-2016, 10:12 AM   #7
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I launched Pumpkin at 5000 on the 2-step and it didn't like it. So far 4800 seems to be the sweet spot, but with the new gear ratio that might change.


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Old 05-10-2016, 11:59 AM   #8
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I launched 392hp/393tq at 5500rpms, 15psi on slicks and cut 1.6 60'. M6.
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Old 05-10-2016, 12:41 PM   #9
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I launched 392hp/393tq at 5500rpms, 15psi on slicks and cut 1.6 60'. M6.
Yeah Pumpkin goes 1.63 at 4800 on slicks.

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Old 05-10-2016, 01:22 PM   #10
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I also have M6 and Hoosier slicks at 15 psi. I launch around 1200-1500 rpm with WOT at the tree. Consistent 1.58-1.59 60'. Why are you trying to kill your car?
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Old 05-10-2016, 02:06 PM   #11
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I also have M6 and Hoosier slicks at 15 psi. I launch around 1200-1500 rpm with WOT at the tree. Consistent 1.58-1.59 60'. Why are you trying to kill your car?
I don't have the luxury of a blower, I'm only a Bolt On NA car. THX to DSS support I have all the right stuff to do it including a 9". I'm not all that far behind you at the 1/8 with 200 less HP. Probably if you launched your blower car at that RPM it would just blow the slicks off anyways.


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Old 05-10-2016, 03:10 PM   #12
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I don't have the luxury of a blower, I'm only a Bolt On NA car. THX to DSS support I have all the right stuff to do it including a 9". I'm not all that far behind you at the 1/8 with 200 less HP. Probably if you launched your blower car at that RPM it would just blow the slicks off anyways.


Actually, I tried higher rpm launch a couple weeks ago. Result was either wheel spin or hop. I decided to stick with what works for my car, lower RPMs.
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Old 05-10-2016, 03:15 PM   #13
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Actually, I tried higher rpm launch a couple weeks ago. Result was either wheel spin or hop. I decided to stick with what works for my car, lower RPMs.
Wheel hop is deadly on parts. Avoid at all costs.

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Old 05-10-2016, 03:30 PM   #14
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Wheel hop is deadly on parts. Avoid at all costs.

That's why I went back to my tried and true method.
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