LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

MAC Mids 1/4 Mile Timeslip gains

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Old Jul 30, 2004 | 02:32 AM
  #16  
Mindgame's Avatar
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Joined: Nov 2001
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From: In a house by the bay
Re: MAC Mids 1/4 Mile Timeslip gains

Not bad at all Dan. You just need to work on those 60' times!

Next time you go to the track try a few of these things (for street tires)...

One, drive around the water and back up just til the rear tires are in the wet section. Put the car in 2nd (you can use 1st if you want but I find it easier to modulate the rpm in 2nd) and drop the clutch. Let the car start to roll forward a few feet and put your foot on the brake to hold the car. Bring the revs up to 5000 and take your foot off the brake letting the car come down off the revs gradually. If you goof the burnout... try it again next time around. Takes practice.
Then you want to launch at an rpm that you can get a good hook and slip the clutch without bogging. You will squeeze the pedal to the floor and don't go WOT til you have traction. Play with your shift points. If 1-2 powershift breaks the tires lose, you may want to try a normal shift. If you can get a 2-3 powershift down, you're guaranteed to cut some time off.

So experiment with different shift rpm and see what you come up with. Gotta work on getting a good consistent lauch first. Then you can quantify gains from different shift points etc..

Get those 60' times down in the 1.8 range and things will start looking good on the board.

Good luck.

-Mindgame
Old Jul 30, 2004 | 02:43 AM
  #17  
Ryan's LT1's Avatar
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Joined: Apr 2004
Posts: 561
From: Ventura County, CA
Re: MAC Mids 1/4 Mile Timeslip gains

Those are awesome times... Good job
Old Jul 30, 2004 | 08:22 AM
  #18  
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Joined: Jun 2003
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From: Saginaw, Michigan
Re: MAC Mids 1/4 Mile Timeslip gains

Thanks for the reply's guys.

Mindgame,
I rolled right around the waterbox this time, and I didn't even clean off the tires with a quick burnout. The launch technique that you mentioned is exactly the way I launched. For me 3500 is the point where I can somewhat drop the clutch and not bog, and mash it once I'm moving. I didn't powershift any gears, and it was funny, when I was making my 3rd to 4th shift at the end of the 1/4, I remember thinking that I wasn't really banging the gears like I should have. (This was just supposed to be a warmup run)

I'm going again this fall, and will try your technique for the burnout, and the shifts. My rev limiter is set at 6000. For the 1-2 powershift, how close to the rev limiter should I get when I shift? I shifted right at 6000(at least I tried to) for this run, but no powershifts.

Does that burnout really help with street tires? Mine are Goodyear F1 GS-D3's, 275/40-17's and I don't want to burn them up if I don't have to.(they aren't cheap). I think my best bet is to buy a cheap pair of wheels and get some Nitto's or ET Streets.

Thanks again. I know my times are average for my mods, and that definately wasn't the point of my post (to say how great the times were). It was more to compare before and after (with the same crappy weather and 60' time )
Dan

Last edited by stereomandan; Jul 30, 2004 at 08:24 AM.
Old Aug 2, 2004 | 05:11 PM
  #19  
96redformula7's Avatar
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Joined: May 2003
Posts: 405
From: El Paso
Re: MAC Mids 1/4 Mile Timeslip gains

stereoman, now you need to copy me. I bought some stocker 5 spoke rims for $80 for the pair, and mounted some ET Streets 26 x 10.5 for the 16 inch rims.
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