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post #91 of 98 (permalink) Old 07-30-2009, 11:41 PM
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Lads! I am going to start tracking my car so I will be taking it to the drags first to gain experience in shifting under pressure.

I have 18" Rims and my tyres are almost finished. Would I be better off buying the new tyres first or would I get more grip with the existing ones as my tyres are currently in a semi-slick condition?

I will be buying Kumho KU31's which are great for straight line balance.

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post #92 of 98 (permalink) Old 01-04-2010, 01:37 AM
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This was useful, thanks
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post #93 of 98 (permalink) Old 02-03-2010, 02:18 PM
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Whenever i go to launch my AWD Speed6, even with DSC off, it boggs out if im higher then 2500 rpm. Any idea why? I will usually rev it too 4000 RPM and then let off the clutch fast while hitting the gas hard. Any input?
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post #94 of 98 (permalink) Old 03-14-2010, 01:05 AM
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Originally Posted by Billrunyon View Post
Whenever i go to launch my AWD Speed6, even with DSC off, it boggs out if im higher then 2500 rpm. Any idea why? I will usually rev it too 4000 RPM and then let off the clutch fast while hitting the gas hard. Any input?
From what I've read recently, you could be calling for too much load, which can result in fuel cut. The engine does this automatically. It will also do this if it detects too much knock, or anything else that it thinks will cause engine damage. What mods do you have? Are you using an AP? It sounds like she needs to be tuned, or it could be your fuel pump, or several other things. Whatever is going on, I'd take it easy until you figure it out and correct it. Good luck.

Anyone else?

EDIT: you may want to repost this question in the engine/drivetrain section and I'm sure you'll get more responses quick (probably at least a few the day you post). I just happened to wander over here and saw your post. I've found that some sections get no little action.. besides this belongs equally well in the eng/driv for sure.

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post #95 of 98 (permalink) Old 04-25-2010, 11:18 PM
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You guys have me all nervous about going to the track next month! My rear diff mount went in a couple months ago, but then tuning took over, then my AP died and other mods went in in the meantime. So, yesterday and today I did my first few launches, and my 60' time went from 2.20 to 2.12 and finally down to 1.88 secs. I hit 60mph in 5 flat with the 1.88 sec 60ft. I was psyched about the 1.88 and hoping for low-mid 13's for the 1/4, but now I'm second guessing myself and the super slippery track!!

I almost don't want to get used to launching on the street if the track will hook up so much differently. That sucks. I always heard you got better grip at the track, but apparently I heard wrong. Anyone know what the NE Speedway (Epping, NH) is like in terms of hooking up or a slippery track?

The other thing is I have LC rev limiter set to 4,100 and FFS rev limiter to 5,500rpms. I think I'm gonna lower the FFS rev limiter, but it will suck if I have to adjust LC rev limiter maps AT the track... I could just cut a few maps with diff LC rev limits I guess... but I'd hate the fact of flashing a new map, idling for like 10 mins, and then launching into the 1/4 mile, lol. Fuel trims should be perfect between maps, but still...

EDIT: Forzda gave me some additional drag racing tips, which he may post in here... if you're lucky! lol

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post #96 of 98 (permalink) Old 04-26-2010, 06:34 PM
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Let me know what other advice you have for the track. I'm not too concerned about my 0-60mph, but I really, really want to do well at the track. I want 13.3 after the fmic, bov, + tune. I may up the boost a bit, we'll see. Oh, how much did my tires affect my 60' time? I thought a 1.88 sec was great considering it was my 4th launch ever. That better not translate to a 2.0 or worse, or I'll be pissed! Makes me want to go buy OEM size tires...



The above is a quote from dougefresh as we were discussing his trip to the track. He asked some good questions that will/would afffect anyone headind to the drag strip, so I thought it might work well here. It may be posted elsewhere, so disregard if so.

Below is my statements back to him.....




Quote:
Actually the shorter tires will work to your advantage at the track as the overall gearing will be lower and the car should accellerate quicker. The track 60ft and 1/4 miles timers don't care what a DH or other gadget says, they just report the facts!

Don't be too disappointed with a mid 13 sec pass. Staging, the launch and shifting quickly is the key to quick times, but it takes practice, practice, practice. The problem with that is your car will likey break before you can get the best run possible for your setup. This is precisely why I stopped making the full power launches after finally hitting two 12 sec passes.

Staging technique is the first process to master. The timers don't start until your tire rolls out of the second beam, so you want as much "head start" on the timers as you can get. If you stage right, the car can roll almost a foot before the timers start.

You want to roll up the lights slowly, trip the first bulb on and stop. Then EASE up until the next bulb just barely lights. If you roll at ALL after the second light comes on, back up and try it again until you just barely break the beam.

The launch is the next most critical phase of the run. Too low rpms and you will bog, too high and you will break the car. Just right and the car leaves with just a touch of squeak from the tires and the motor still pulling hard in the power.

The next is shifting obviously. You really need a WOT dyno run to see where the power is for a given setup, but I recommend running it out to ~6500. It has lost a bit of power at this point, but when you shift it is right back into the middle of the sweet spot power. You will not lose nearly as much acceleration power as if you had shifted early and brought it back to the next gear at too low power output. Get it?

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post #97 of 98 (permalink) Old 04-26-2010, 06:41 PM
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Quote:
Originally Posted by Billrunyon View Post
Whenever i go to launch my AWD Speed6, even with DSC off, it boggs out if im higher then 2500 rpm. Any idea why? I will usually rev it too 4000 RPM and then let off the clutch fast while hitting the gas hard. Any input?
Yeah, the rpms are higher than a normal quick start and you're lilkely not making enough power to get the heavy car moving for a full power launch. Rev it to at least 4k to get the turbo spinning and then floor it slightly before letting the clutch out REALLY quickly.

I launch at 4600 rpm with the AP Launch Control. I used the same 4600 rpms with a WOT/2-step box as well. With AWD you MUST have it well into the power or it WILL bog unless you can get a just a bit of wheel spin.

Try driving straight through the water box and stage with the tires slightly wet to get a bit of spin and that should keep the motor in the power.

`07 Speed6 Sport Titanium Gray w/Cobb; ETS; CorkSport; TXS; M2Perf; BNR S3; DNP; MAP; Perrin; KMD; F2; SM; Labonte... Yeah, I really like Mazda... ZOOM! freakin' ZOOOOOM!

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post #98 of 98 (permalink) Old 09-16-2012, 07:05 PM
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this was super helpful
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