? launch rpm with a 2 step - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 23 Old 09-14-2017, 08:46 PM Thread Starter
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? launch rpm with a 2 step

Going to be using a 2 step for the first time on my 600rwhp 2v t56 with 4.10s and mt 26 inch slicks.
What rpm do you supercharged guys usually leave around ? I know track prep and conditions play a role.


96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #2 of 23 Old 09-14-2017, 11:00 PM
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I have 28x10.5 cheaters and launch about 4500. But im still fine tuning the launch


2002 gt...v2 strim, front mount cooler, Anderson power pipe, E85 tuned, victor jr. intake 60lb hr injectors, return style fuel system, longtubes, catless, 50/50s and strange 10 ways, Team Z UCA's and LCA
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post #3 of 23 Old 09-15-2017, 06:14 AM
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5500 with hoosier 28x9, 4,10 and Astro T5.
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post #4 of 23 Old 09-15-2017, 07:33 AM Thread Starter
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What are your 60ft times ?

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #5 of 23 Old 09-15-2017, 12:15 PM
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Best so far is 1.71 on a HOT day

2002 gt...v2 strim, front mount cooler, Anderson power pipe, E85 tuned, victor jr. intake 60lb hr injectors, return style fuel system, longtubes, catless, 50/50s and strange 10 ways, Team Z UCA's and LCA
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post #6 of 23 Old 09-20-2017, 03:30 PM
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Quote:
Originally Posted by bigger_is_better View Post
5500 with hoosier 28x9, 4,10 and Astro T5.
1,52 with 18 psi of air pressure. Need to work on suspension settings and launch RPM.
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post #7 of 23 Old 09-20-2017, 07:41 PM Thread Starter
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went to the track sunday to work on my 60ft times and had some ignition issues when trying to use my n2mb wotbox 2 step so I just disable it.manage a 1.68 launching around 5500.cant wait to see how it will improve leaving on boost once I get the 2 step under boost.

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #8 of 23 Old 09-21-2017, 05:29 AM
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Originally Posted by vortech gt View Post
went to the track sunday to work on my 60ft times and had some ignition issues when trying to use my n2mb wotbox 2 step so I just disable it.manage a 1.68 launching around 5500.cant wait to see how it will improve leaving on boost once I get the 2 step under boost.
Getting much better than last time, should get even better with 2-step dialed in. Can you have someone watch your tires at launch? It's a fine line between blowing off the tires and getting the right amount of traction.
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post #9 of 23 Old 09-21-2017, 08:36 AM
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3700 rpm on Mickey Bias R 26x10.5 with 14psi 1.6x 60'

408w, tko600, NX and a little bit of everything else.
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post #10 of 23 Old 09-21-2017, 09:09 AM
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Stretched my Luck when experimenting on launch RPM (not set the 2- step yet). Going for sub 7's in the 1/8 mile I dumped the clutch at a newly prepped tsrating line at 6000 rpm, and I stripped the crownwheel. 26" tires, A5 and 3.75 rears, 347 N/A and 2400 lbs.

Did my best at 7.0x and set my trust in 6.9x, but no....


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post #11 of 23 Old 09-21-2017, 01:20 PM
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and I stripped the crownwheel. .
Lol, I had to Google Crownwheel to figure out you were referring to the ring and pinion gears.

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Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
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post #12 of 23 Old 09-22-2017, 12:10 AM Thread Starter
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my car always seems to bog even with 5k rpm launches,i think the 2.66 1st gear in my viper t56 is hurting my 60ft times.it never spins on my 26 inch et slicks.have videos but don't know how to post them.

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #13 of 23 Old 09-22-2017, 04:17 AM
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Assuming I know nothing about how your car is setup etc, 5500 seems pretty high of a launch, I'm in the 3500-3700 range. However I was running a 3.380 1st. Your gearset would be like me launching in 2nd, what was the rear gear again?
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post #14 of 23 Old 09-22-2017, 04:23 AM
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Re-read entire post, yours is a 5k launch, which seems a little better, but really shouldn't bog, maybe lower launch rpm? Did you work up to that rpm launch? And I did read a 4.10 ratio, by the time it makes power to the wheels, because mine is going through a 3.27 rear gear, it should essentially spin the tire at the same speed.
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post #15 of 23 Old 09-22-2017, 08:19 PM
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Quote:
Originally Posted by vortech gt View Post
my car always seems to bog even with 5k rpm launches,i think the 2.66 1st gear in my viper t56 is hurting my 60ft times.it never spins on my 26 inch et slicks.have videos but don't know how to post them.
If it bogs, that means it stick. Increase air pressure to see how it react.
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post #16 of 23 Old 09-23-2017, 11:43 PM Thread Starter
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I run 13 psi cold in the slicks as my car weighs 3600 lbs.my old t45 with a 3.37 1st gear. and 4.10s netted 1.62-1.66 60ft times when I was making 370rwhp.now i'm at 602rwhp and cant get this car to 60ft with the t56 and the 2.66 1st gear.think I will increase the tire pressure and see what happens

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #17 of 23 Old 09-24-2017, 08:35 PM
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I agree, some spinning of the tires is good, as long as it's a controlled spin though. A dead hook will most certainly bog. My best course of action with my learning curve was to do multiple launches at different rpm's until I found that gray area between blowing the tires up in smoke and getting a dead hook bog. I never messed with pressure in the tire, which may not be good advice, but it adds another variable to test. If in fact nothing else works, by all means. I did a bit of research on optimum tire pressure for mine though, and used it as the constant with the rpm being the variable. What is redline for your setup? If your launching at 5k and getting a bog, there doesn't seem like much room to increase launch speed?
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post #18 of 23 Old 10-05-2017, 12:02 AM
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3,200-3,400 rpm, 3.08 gears, 1.80 first gear (glide), 3445 lbs, 26x8.5" slicks best 60' 1.41.

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'84 LTD LX - 9.83 at 140.09. Whippled 365 SBF with a glide and 3.08 gears. Driven to and from the track 60 miles without even changing tire pressure.
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post #19 of 23 Old 10-06-2017, 12:13 AM Thread Starter
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well I finally figured out how to launch the car.went to the track sunday for a test and tune and cut a 1.52,1.53 and a 1.56.ran a bunch of [email protected] to 125mph.car is way down on power and on the last pass pop the headgasket and melted a plug.i have to say that i'm very please with my 60fts times considering this is with eibach prokit lowering springs,tokico5 way adjustable struts and shocks and the front sway bar still hooked up.

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #20 of 23 Old 10-17-2017, 02:46 PM
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Wow, thata nice !!! What have you tried to get those time? You're very close of 10's timeslip !
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post #21 of 23 Old 10-21-2017, 11:57 PM Thread Starter
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I think the issue was more the way I was launching the car.going off some advice from a fellow 8 sec racer I mashed the gas to the floor on the 3rd yellow and then dump the clutch which resulting in a 1.52 60ft 1st pass of the trailer and a [email protected] was way down on power from my original 600rwhp that it made back in june based on my low mph.car should be trapping 130mph or so which was comfirm when I puled the plugs and found 2 melted.will fix it over the winter,and should be in the 10s next season.

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #22 of 23 Old 11-06-2017, 01:17 PM
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Quote:
Originally Posted by vortech gt View Post
I think the issue was more the way I was launching the car.going off some advice from a fellow 8 sec racer I mashed the gas to the floor on the 3rd yellow and then dump the clutch which resulting in a 1.52 60ft 1st pass of the trailer and a [email protected] was way down on power from my original 600rwhp that it made back in june based on my low mph.car should be trapping 130mph or so which was comfirm when I puled the plugs and found 2 melted.will fix it over the winter,and should be in the 10s next season.
When the stage light is lit on both sides, hold your RPM up to 3,000+. When your 1st amber comes on, mat it to your launch RPM (if using a 2-step go WOT). Release pedal on last amber.
Waiting to do all this until the last amber, as you have been doing, will not allow the clutch counter weights (if you have them) to be engaged plus this allows the engine to be “clean” (for lack of a better word) with no fuel puddling or going full rich as you engage the clutch. It also leaves you more mentally prepared to launch the car at the right time for best reaction time instead of doing everything all at once.
FYI - use this formula: 1320/MPH = optimum ET (assuming more race car than street car)
so 1320/123 = 10.73 ET you are capable of. You don’t need any more HP to go 10’s, you just need to get your clutch, suspension and launch in check.

With the 2.66 1st gear, just add more RPM and / or pressure to your slicks until it spins 2-3 times off the line. It will go faster, especially if your dead hooking it (which can be bad on parts). I think you said you have adjustable rear shocks? You can stiffen the rate and that may also cause tire spin. When you really want to go fast, get an adjustable base pressure & CW clutch. That’s a whole ‘nother world!
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post #23 of 23 Old 11-06-2017, 03:54 PM
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"car was way down on power from my original 600rwhp"

maybe that's why its hooking better...?

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