time slips and money in truck

[red85]

The real secret is in the gearing. A 302 in a Ranger will spin the tires from here to eternity with a set of 4.10's on a set of 235/75/15's. With the same truck and tires and a set of 3.45's the torque of the motor against the slightly taller gears allows the truck to hook well, have screaming top end and good manners on the highway.

Baddad, you're absolutely right about being dissatisfied with the results. I have had mine completed for a couple years and have been consistently plotting the "more power" plan ever since the truck moved under its' own power for the first time. Right now I'm working on a nice new motor, but if finances can't cooperate I'll do some more porting on my heads and call it a day until I can put the big bad 427W under my hood.

Ironman, if you want to do a V8 conversion, do it. You will learn a ton about your truck in the process. I did mine because a guy at a parts counter told me I couldn't do it. I was stubborn, pissed and determined. I did it and have always made sure I brought it by that parts store whenever I wanted something small just to turn the knife a little

 

[Twizzler09]

Ok, so if the secret is in the gearing....

Say I'm running a 302 stroked/bored to 347, and I'm pushing 415 horses and 410 lbs/ft torque, my Transmisison ratios are: 2.84/1.56/1.00/0.67 and I'm running 235/50/17 tires.

For 1/4 mile... I need a balance between top speed and acceleration. Which rear-end ratio would be best, 3.73, 4.10. 4.56?

Crunching those number my potential top speeds (assuming engine redlines at 6.5K RPM) in each gear is:

3.73 Rear
1st: 47mph
2nd: 87mph
3rd: 136mph
4th: 203mph

4.10 Rear
1st: 43mph
2nd: 79mph
3rd: 123mph
4th: 184mph

4.53 Rear
1st: 39mph
2nd: 71mph
3rd: 111mph
4th: 166mph


Now, assuming the truck is able to get up to speeds that high, which one of these would be best for a 1/4 mile situation? Something between 4.10 and 4.56 I think would be ideal because it would give me excellent acceleration abilities, given I don't think I'll be running 7.5 second 170mph+ times, which means I could live with a 166mph top speed.

Correct me if I'm wrong, I'm trying to make sure my theory on proper drag setups is correct.

 

[baddad457]

I don't know where you got those figures from, but you'd have to spin the motor to 9700 rpms to make it to 203 mph with 3.73's. That ain't gonna happen with 26" tires. Top speed with a 347 (7500 rpms, if it'll pull that in 4th) would only be 157. With 400 ft/lbs torque, you could get by fine with 3.25's.

 

[Twizzler09]

4th Gear runs a ratio of 0.67 which drastically increases the potential top speed of the vehicle in question. If I'm not mistaken, 3.25 would drastically decrease the vehicle's acceleration ability when compared to say a 4.10... which for 1/4 mile times, is not what I need. The faster it accelerates, the better.

With the maximum safe RPM of the engine being 6500, and the ratio of the gear currently being used (in the case of 4th gear, 0.67...tire size 235/50/17) and the final drive ratio being 3.73, equated to a potential top speed of 203mph *ASSUMING THE MOTOR IN QUESTION COULD GET IT THERE*

As I understand it, engine CID/Displacement in no way correlates to the top speed of the vehicle (after all, there are 190CID motors that run 200+ mph). If I'm correct in saying so, top speed is directly related to the maximum engine RPMs, Trans Gear Ratio, and the Rear-End Ratio, operating under the assumption that the motor in question is capable of the power output nessecary to reach the assumed top speed. Acceleration is determined by a combination of the power output of the motor in question and the Trans Ratios/Rear-End Ratio. The resulting combination from the engine power output and gearing determines how quickly the vehicle will be able to attain its max speed.

Is this correct? Correct me if I'm wrong here, please.

http://www.catherineandken.co.uk/sti/tyres.html <--- been using that for the calculations, would someone mind looking into it and making sure its accurate? I'd hate to use it to try and plan out a decent drag setup only to find out its inaccurate.

 

[macdaddy31516]

Base 6.0 Corvette is 400hp and 400ft#--real SAE net horsepower, not gross. 4.8 0-60 and a 12.8 @ 107mph in the quarter-mile.

Z06 Corvette 7.0 liter, 505hp 470ft#--again, real SAE numbers. 4.5 0-60 and 12.2 @ 120mph.

I'd like a chance to take on a 302 Ranger in either of these Corvettes.

with those 60 ft. times, i am confident you will be sick if you try me.

 

[red85]

^ $5 on Macdaddy LOL

 

[baddad457]

4th Gear runs a ratio of 0.67 which drastically increases the potential top speed of the vehicle in question. If I'm not mistaken, 3.25 would drastically decrease the vehicle's acceleration ability when compared to say a 4.10... which for 1/4 mile times, is not what I need. The faster it accelerates, the better.

With the maximum safe RPM of the engine being 6500, and the ratio of the gear currently being used (in the case of 4th gear, 0.67...tire size 235/50/17) and the final drive ratio being 3.73, equated to a potential top speed of 203mph *ASSUMING THE MOTOR IN QUESTION COULD GET IT THERE*

As I understand it, engine CID/Displacement in no way correlates to the top speed of the vehicle (after all, there are 190CID motors that run 200+ mph). If I'm correct in saying so, top speed is directly related to the maximum engine RPMs, Trans Gear Ratio, and the Rear-End Ratio, operating under the assumption that the motor in question is capable of the power output nessecary to reach the assumed top speed. Acceleration is determined by a combination of the power output of the motor in question and the Trans Ratios/Rear-End Ratio. The resulting combination from the engine power output and gearing determines how quickly the vehicle will be able to attain its max speed.

Is this correct? Correct me if I'm wrong here, please.

http://www.catherineandken.co.uk/sti/tyres.html <--- been using that for the calculations, would someone mind looking into it and making sure its accurate? I'd hate to use it to try and plan out a decent drag setup only to find out its inaccurate.

Fourth gear in what? The 3+1 OD's I know of all run a .70 4th. You'd have to have one hell of an engine to turn that many rpms in any overdrive transmission. 1:1 4th is more like it in a 5 speed.

 

[ironman]

surprised-thought that there would be alot more people that ran there trucks at the track. Here in ky many tracks to go to. By spring will have a truck built and time slips to show times in a 1/8 and 1/4 mile tracks would be nice to get a few people together to have a ranger shoot out{like the stangs do}

 

[v-8power]

As of right now i have less than a grand in my 351w swap, that includes the price of the truck. I already had most of the parts. I guess if i added the price of them from when i bought them it would be closer to 2500. I can not wait to take it to the track. I'm hoping it'll be faster then the 2.3 i took out.LOL

 

[Maverick]

with those 60 ft. times, i am confident you will be sick if you try me.

Are you serious? Look a little closer, that's 0-60 MPH. If your truck beat a regular Vette, you got some money into it. That or the guy in the Vette doesn't know where the skinny pedal is.

 

[Twizzler09]

baddad, the transmission I used as a reference point (mainly because I'm looking at using it in my truck.. ) is the 4STB transmission from FB Transmissions. Its 4th/OD gear is 0.67, and it has two different gearing options for 1st/2nd. All the 4STB is, at least what the guys at FB say it is, is the Ford AOD with a manual valve body.

I know its gonna take a hell of a motor to get it to 6500RPM with a .67 OD gearing, which is why I've been playing with the rear differential ratio, and I'm adding a blower to the Motor I'm looking at, pushing it from 415hp/410 lbs-ft to somewhere in the 500 neighborhood on both counts (I hope, lol). This is why I've been talking about rear-end ratios, and which one of the three I mentioned, would be best for the 1/4 mile. I'm thinking about running 4.10 or 4.56 right now, they seem like the better option to me.

 

[baddad457]

Oh, I see now, I thought you were looking at manual transmissions. Unless you do something different with the rear suspension, I'd go with 3.73's. At a minimum, you need to move the battery and fuel tank to the rear of the truck, even then, getting it to hook up is hard unless you're going to run slicks.

 

[baddad457]

At 6500, mine was topped in with the 331 at 140 mph. But that's with the Toploader 4 speed (1:1 4th)

 

[Twizzler09]

Well the truck is getting lowered, 4 inch on front 5 inch on back, and I'm thinking about putting in a custom 4-link rear and running drag slicks....

The fuel tank is already in the rear section of the truck, but I'm switching from the 20.5 gallon tank to probably an 8 gallon fuel cell.

Out of curiosity, why the 3.73? What in your opinion makes it the best choice? I'm still needing some good input here =)

 

[macdaddy31516]

Are you serious? Look a little closer, that's 0-60 MPH. If your truck beat a regular Vette, you got some money into it. That or the guy in the Vette doesn't know where the skinny pedal is.

oops, i see that now. i will still take"em, i aint skeered! the corvette is not what its all cracked up to be.