FASTFATBOY

iTrader: (23)

Ok heres the story

@3800lbs in 40* air, DA was in the center of the earth about -1800ft it went 11.02@124 with the converter locking in the back 1/2, 60ft on that pass was 1.53. This was on 325/50 M/T radials.

SOOOOOOOOOO, I take close to 40lbs of weight out of the car(rear bumper support, door bars), put 28x10.5W slicks on the car. Disable the converter lockup in the back 1/2(trans guys says its bad for the input shaft) DA not as good as the previous 11.02 outing, probably+500 or so.
Car runs 11.03@122.8 , 60ft 1.53. Temp was in the mid 50's with higher humidity than the 11.02@124 run.

If anyone knows how to get the DA for Hattiesburg Miss last night at 7:00PM I would appreciate it.

I figured out the Da at the time of the run, was -600ft, the previous runs were at -1850 ft, so technically I guess the car IS quicker, just not on the slip.

Seems like the slicks slowed it down in the back 1/2, like the car was laboring, dropped 450 rpm through the traps with the slicks.

Car "FEELS" like it leaves much harder on the slicks, picks up the tires a foot and a half, ran a best 60 ft of 1.50

It ran a best of 7.01@97.2 in the 1/8

The converter will stall 3000 ish on the foot brake and flash to 4100/4200, the converter is the problem?



The front of my head is FLAT from doing this


David

silverbeast

iTrader: (16)

Going from the drag radial to the slick will cost you a couple mph on the other end. I would stick with the radial and play with the air pressure and see if you can get a better 60' good luck

jason02Z

iTrader: (10)

try going down a tire size, 325's are huge for a car thats just trying to get in the 10's.

FASTFATBOY

iTrader: (23)

Well I did that to try and hook it on the street, it will get a 200 shot on it soon, hoping to run in the 9's. Another reason for the 325.

David

Tireburnin

iTrader: (42)

What was the zipcode for the racetrack you raced at. There is a website with historical data that you could look it up.

Locking up your converter the first time and not the second probably made a bit of MPH difference. Next time make a pass with it locked to rule out/factor the difference.

Pro Stock John

iTrader: (34)

Too much tire for your combo, I did that seven years ago when my Formy had a 422ci iron block. I went 11.doh with 26's on a 1.53 and then went to a 28 and went 1.50 and ran 11.doh with less mph.

silverbeast

iTrader: (16)

how much power was your 422 making John? off topic, i know.

Pro Stock John

iTrader: (34)

472rwhp locked, 4L60E, 4.10's, 3600 raceweight Went like 11.02@122.8 or something on 28's on like a 1.5x 60 ft time. Unlocked it was around 450rwhp I think.

Fastfat needs less tire, or more gear, or more converter and more gear etc... Your rig is so heavy you don't need 28's on motor.

Ego Killer

iTrader: (147)

I ran a faster 60' on my M/T 325x50 drag radials than I did on 26x10x15 slicks. you need to try to get you sixty done a little. I see you have a 4k converter what gears do you have?

FASTFATBOY

iTrader: (23)

It has 4.11 gears. The slicks growing I think hurt me.....BUT the slicks are 1/2 the weight of the drag radials.


As you guys can see, I am frustrated with this car. It made 441 RWHP unlocked and 463 locked...I feel like it has the power to run 10.99. I know it is heavy, I was always taught the heavier the car them more tire it needs. Think I should try a regular 28x10 stiff sidewall tire? I have that much tire to try and hook it on the street, which it wont.

It "feels" like it dead hooks, I have not any video of the car. Guys watching the car say it leaves well.

Looks like some Kirkey seats and other lightweight items are in my future. Car makes good power just carrying too much weight to run 10's on motor. 3750 lbs it seems it just too much to overcome with 441 rwhp.



David

Tireburnin

iTrader: (42)

At 7pm the weather was:

6:53 PM 53.1 °F / 11.7 °C 37.0 °F / 2.8 °C 55% 30.30 in / 1025.9 hPa 10.0 miles / 16.1 kilometers Calm Calm - N/A Clear

The DA calculates out to -700ish. Pretty damn good air.
http://www.weatherunderground.com/

RAGENZ28

iTrader: (5)

I wouldn't change the tire, it's not working that bad, 1.5's isn't that great but it isn't horrible, with 122 mph you'll be able to run 10.99 easy, only thing stopping you now is a few 0.0x's in the 60 ft.

I think back when I was running in the 10.90's my 60ft averaged about a 1.45-1.47, so you're not too far off running in the 10's, besides once you spray the car it is going to be a whole new animal, less gear and a bigger tire and lower stall works awesome with nitrous cars, you just have a trade off when you try to get the most from your combo on motor only. I'd tune on the chassis and try to get a little more out of the 60ft and then start spraying the car.

FASTFATBOY

iTrader: (23)

Can you look up the DA for Dec 16th 2007 for the same track at 6:30 pm.

When I ran the previous 11.02 the DA was -1800 feet. So the car technically IS quicker. But it frustrates the hell outta me.

I personally think the converter is too tight, but I think it will be good for the spray with some 295/65's on the car and the 4.11 gear.

I have been told on a 150 shot this car could go 9.90's.....YES I could DIG that.

David

flyinZ

iTrader: (15)

Did you ever try to flash the convertor? (Not brake torque it off the line, just come off idle)

Tireburnin

iTrader: (42)

I did the math for 12/16 and it looks to be between -1300 and -1600 feet depending on the track altitude and the time of day you raced (I assumed 7pm like above).

So if you ran the same at half the negative air density, be happy. With the same air (all be it rare to find it that good) you would have run tens.

Like the other people have posted, either pull weight, add gear/converter or tinker for that little extra oomph to get you across. Weight would be your biggest and easiest change.

BAKED

iTrader: (14)

Put some 26's on it, hold the rpm's at about 1800 and flash it off the line.

Or put that pig on a diet. LOL

Heavy cars need alot of gear to help get them movin, the 26's should help you out just enough I would think.

BADHAWK51

iTrader: (1)

David,

My car makes similar power to your Na and I'm going to be hitting the car with a nice shot but I'm going to try running MT 275/60/15 instead like some of the other people are saying 325's are a lot of tire. Also there are a lot of people going sub 9's on the 275's.

Good luck.

Pro Stock John

iTrader: (34)

You are at the point where you might need to change something. Maybe loosen up the converter a little, or run less tire. 11.02 @ -1800 DA means that in regular weather you are like an 11.1-11.2 car.

I'd consider loosening up the converter a smidge. Research with your local guys but I've also heard that having the engine a bit leaner will make the converter hit harder, but that's just me quoting something I read.

My car went 10.92 on a 1.48, and that was the best weather I see up here, like maybe 500 DA. You need a 1.4 short time or more power to hit 10's. You could always try to make another 20hp too.

Rogue86

iTrader: (14)

Between the super heavy race weight and the huge drop in RPM from the tires growing, i think you have your culprit for why the car won't go any faster.

If you go with a looser converter it isn't going to run as well when you put the spray to it. Same goes with more gear, it'll prolly run out of breath on the top end if you put enough gear in it N/A.

Ditching weight would probably be your best option.

Don't go to a 26" tire. 28" is just fine, it will help keep you from fighting traction problems on down the road.

BOLO

iTrader: (40)

I run 325/50's,4.10 gearing/3600 stall. As you can see, in my sig, it's working great on the juice but not so good on motor. Check out my video, first run ever on the juice.