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This can't be right (can it?) #1079946 09/21/11 05:54 PM 09/21/11 05:54 PM
Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH WILD BILL OP Senior Member of the Junior Dragster Club
WILD BILL OP Senior Member of the Junior Dragster Club Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH	I'm using Wallace Racing Calculator to determine my Conv slip % Using 132.66 mph/7000 Rpm at the line/ 4:56 gear ratio/ and the advertised roll out of my tires as 97" I came up with 17.511 % I tried varying the rpm and tire size a little figuring I might be going a little under what I think I see on the tack or thinking I might have to acct for tire growth but it still comes in as what I think is a way high slip percentage. For some reason I was expecting somewhere around a 5 or 6 % number. Can this be right?

Re: This can't be right (can it?) [Re: WILD BILL] #1079947 09/21/11 05:59 PM 09/21/11 05:59 PM
Joined: Jul 2003 Posts: 12,129 Cleveland sunroofgtx I Live Here
sunroofgtx I Live Here Joined: Jul 2003 Posts: 12,129 Cleveland	That would put you around 1150 horse adjusted ! Not far off. Join the quickest team in motorsports. Team FireCore. CustomWiresets.com

Re: This can't be right (can it?) [Re: WILD BILL] #1079948 09/21/11 06:02 PM 09/21/11 06:02 PM
Joined: Nov 2007 Posts: 1,600 Alberta Canada StrokerAspen top fuel
StrokerAspen top fuel Joined: Nov 2007 Posts: 1,600 Alberta Canada	HM.... I come up with 6.5% slip... I am using a diameter of 31" is this correct? -Kenny

Re: This can't be right (can it?) [Re: StrokerAspen] #1079949 09/21/11 06:08 PM 09/21/11 06:08 PM
Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH WILD BILL OP Senior Member of the Junior Dragster Club
WILD BILL OP Senior Member of the Junior Dragster Club Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH	Yes, they are 31's but why are you using the diameter? The calulator I see wants MPH, RPM, Gear, & CIRCUMFERENCE (inches}

Re: This can't be right (can it?) [Re: WILD BILL] #1079950 09/21/11 06:11 PM 09/21/11 06:11 PM
Joined: Jan 2003 Posts: 6,350 Aurora, Oh. M max_maniac master
max_maniac master M Joined: Jan 2003 Posts: 6,350 Aurora, Oh.	I used the numbers you supplied and came up with 5.962% Russ

Re: This can't be right (can it?) [Re: WILD BILL] #1079951 09/21/11 06:13 PM 09/21/11 06:13 PM
Joined: Nov 2007 Posts: 1,600 Alberta Canada StrokerAspen top fuel
StrokerAspen top fuel Joined: Nov 2007 Posts: 1,600 Alberta Canada	Quote: Yes, they are 31's but why are you using the diameter? The calulator I see wants MPH, RPM, Gear, & CIRCUMFERENCE (inches} The calculator I am using works off diameter. Basically the calculator I am using takes the diameter, and uses the circumference based on the diameter. 31" X 3.1416 = 97.3896" I have used this calculator to calculated quite a few cars and it has worked for me. I have had good luck with the Wallace stuff too though.

Re: This can't be right (can it?) [Re: max_maniac] #1079952 09/21/11 06:34 PM 09/21/11 06:34 PM
Joined: Jan 2003 Posts: 16,923 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,923 NC	Quote: I used the numbers you supplied and came up with 5.962% Russ I came up with the same thing using the Wallace Calculator http://www.wallaceracing.com/converter-slip.php

Re: This can't be right (can it?) [Re: WILD BILL] #1079953 09/21/11 06:36 PM 09/21/11 06:36 PM
Joined: Jan 2003 Posts: 16,923 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,923 NC	Quote: I'm using Wallace Racing Calculator to determine my Conv slip % Using 132.66 mph/7000 Rpm at the line/ 4:56 gear ratio/ and the advertised roll out of my tires as 97" I came up with 17.511 % You are inputing gear ratio with a colon (4:56) instead of the proper way which is a decimal (4.56)

Re: This can't be right (can it?) [Re: StrokerAspen] #1079954 09/21/11 06:41 PM 09/21/11 06:41 PM
Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH WILD BILL OP Senior Member of the Junior Dragster Club
WILD BILL OP Senior Member of the Junior Dragster Club Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH	Now I see what I was doing wrong I was typing in 4:56 instead of 4.56 and that's what gave me the high slip. Once I put in 4.56 I got 5.962 % However, that said, I was starting to think that with the high slip that I was leaving some ET on the table and that a tighter conv would help get it to where it seems everyone thinks it should be running. Now, I don't know what to think. How do you know if you have the right (best) conv for your car?

Re: This can't be right (can it?) [Re: WILD BILL] #1079955 09/21/11 06:49 PM 09/21/11 06:49 PM
Joined: Nov 2007 Posts: 1,600 Alberta Canada StrokerAspen top fuel
StrokerAspen top fuel Joined: Nov 2007 Posts: 1,600 Alberta Canada	I would say 6% isn't too bad. What size is the converter? if it is an 8", maybe you could get a 9" converter built that will still get you off the mark the same. I would say everything is working well. There is a little simple math problem that gives you an idea. 1320/MPH = Optimum ET. 1320/132.5 = 9.962 An exapmle of one that ISN'T working to its full potential is My car But that's to be expected with a big loose converter and 3.23 gears. 1320/128 = 10.313..... I have gone 10.68. Is it a scientific math formula? No, I think it's a fluke that it works. haha. OR maybe it is and I don't know why it works. But it does. -Kenny

Re: This can't be right (can it?) [Re: WILD BILL] #1079956 09/21/11 06:49 PM 09/21/11 06:49 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Yep as you know you were doing it wrong. Your slip will be just abit higher then that because of tire growth. MT tires will grow about 1" according to MT. IMO, you your vert is ideal when the 60 fts are inline with the MPH for its ET. But theres more to it then that. Some verts will have more torque multiplication then others. Most of the Good names should be in the same range of multiplication IMO. But maybe not. Congrats on your 9,s.

Re: This can't be right (can it?) [Re: Sport440] #1079957 09/21/11 07:02 PM 09/21/11 07:02 PM
Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH WILD BILL OP Senior Member of the Junior Dragster Club
WILD BILL OP Senior Member of the Junior Dragster Club Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH	Calculated 60' for that pass was 1.383467 Actual 60' was 1.361

Re: This can't be right (can it?) [Re: WILD BILL] #1079958 09/21/11 08:31 PM 09/21/11 08:31 PM
Joined: Nov 2003 Posts: 7,348 Mt.Vernon ,Ohio VernMotor master
VernMotor master Joined: Nov 2003 Posts: 7,348 Mt.Vernon ,Ohio	well for me it says I got 8.14% slip. But that 1320/120 says 11.00 we run allot of 11.0s

Re: This can't be right (can it?) [Re: VernMotor] #1079959 09/21/11 10:06 PM 09/21/11 10:06 PM
Joined: Dec 2009 Posts: 20,622 in a cattle trailer down by th... G Guitar Jones Paddle faster! I hear banjo music!
Guitar Jones Paddle faster! I hear banjo music! G Joined: Dec 2009 Posts: 20,622 in a cattle trailer down by th...	It's all math...and physics, math and physics. Why didn't I pay more attention in school... "Follow me the wise man said, but he walked behind" '92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.

Re: This can't be right (can it?) [Re: Guitar Jones] #1079960 09/21/11 10:32 PM 09/21/11 10:32 PM
Joined: Apr 2006 Posts: 3,675 Akron, Ohio U.S.A. roadhazard master
roadhazard master Joined: Apr 2006 Posts: 3,675 Akron, Ohio U.S.A.	I've seen a few of your recent posts Guitar Jones and wonder if we're brothers I'm going to run mine now & try the "Stroker Aspen Math" Congrats on that 9 Bill

Re: This can't be right (can it?) [Re: roadhazard] #1079961 09/21/11 11:13 PM 09/21/11 11:13 PM
Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH WILD BILL OP Senior Member of the Junior Dragster Club
WILD BILL OP Senior Member of the Junior Dragster Club Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH	Quote: I've seen a few of your recent posts Guitar Jones and wonder if we're brothers No need to insult the guy Greg And thanks

Re: This can't be right (can it?) [Re: WILD BILL] #1079962 09/22/11 12:10 AM 09/22/11 12:10 AM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Quote: Calculated 60' for that pass was 1.383467 Actual 60' was 1.361 That 1.361 60 ft. is inline with your et IMO Your MPH is just a touch low, but well withen normal perimeters for your et. My summary, your 60 ft. and ET and vert slip is well within range. Your MPH is close to optimum too. Last edited by Sport440; 09/22/11 12:14 AM.

Re: This can't be right (can it?) [Re: Sport440] #1079963 09/22/11 12:20 AM 09/22/11 12:20 AM
Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH WILD BILL OP Senior Member of the Junior Dragster Club
WILD BILL OP Senior Member of the Junior Dragster Club Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH	Doesn't sound like I'll be able to squeeze much more out of it then On the other hand, that also means I can just put it away for the winter and NOT have to on it

Re: This can't be right (can it?) [Re: WILD BILL] #1079964 09/22/11 12:24 AM 09/22/11 12:24 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Doesn't sound like I'll be able to squeeze much more out of it then On the other hand, that also means I can just put it away for the winter and NOT have to on it Have you tried anything on the tune up Bill... its real close for the HP to weight(at that given time)

Re: This can't be right (can it?) [Re: MR_P_BODY] #1079965 09/22/11 12:42 AM 09/22/11 12:42 AM
Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH WILD BILL OP Senior Member of the Junior Dragster Club
WILD BILL OP Senior Member of the Junior Dragster Club Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH	Aside from jetting it up a bit no. I was planning on going a little more on the jetting next year to see if I could get the MPH to fall off but that's it.

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