0 - 60 mph times with G-Tech, not bad, but could be better...

[JyRO]

Guys,



I'm getting close to as low a 0 - 60 mph time as I can get. Problem is, I'm coming off the line spinning in 2nd gear, and spinning/shuttering in 3rd gear as well. I'm getting down to 9. 23 seconds 0 - 60 mph in 2WD, with a 6-speed and 3. 54's.



I tried to launch in 4WD once, and figured I'd leave it in 4WD until 4th gear, but after getting into 4th gear and then the throttle, thought it may be a bad idea to bump it out of 4X while under full throttle. Maybe it wouldn't do anything ... I'm not sure. Any of you guys have a suggestion or 2? Should I just leave it in 4X? Only problem is, I'm doing this on dry pavement and thought I should get out of 4X as soon as I can.



Also, I try to shift out of 2nd at about 2,800 rpm, which is not all that easy since its accelerating so quick, but once I get 3rd fully engaged the engine's at about 2,400 - 2,500 rpm, so I don't have much left for 3rd. I tried to go from about 3,000 rpm in 2nd to 4th (not accelerating hard, just wanting to see what rpm 4th would be at if I skipped 3rd), but 4th seemed to be all the way down to about 1,600 - 1,700 rpm. Should I wind 2nd out to 3,300 rpm, then shift to 4th, hoping to get in 4th around 1,800 - 1,900 rpm? TIA.



- JyRO

 

[jarsong]

Jyro, I have 4:10's and when I'm looking for a hole shot I start in 3rd. To much slipping in 3rd with 3:54's?

jarsong

 

[JyRO]

Good question...

jarsong - I thought about trying launching in 3rd. But I didn't. I can tell you that if I try to leave from a dead stop smoothly in 3rd instead of 2nd with 3. 54's, its more hairy than you think it would be. I guess I didn't try it because I'm trying to see how low I can get my 0 - 60 mph time, for curiosity only. I don't want to tear anything up, or add power to reduce the time. My curiousity stems from a PSD guy here at work telling me that he brought his '97 PSD with auto, 4. 10's, 1 ton, LB, crewcab down from ~13. 5 seconds 0 - 60 mph, to about 12. 5 seconds 0 - 60 mph. All by larger downpipe and tailpipe, and intake mods. Don't get me wrong, he has a nice truck, and I believe what he's told me. But I put the G-Tech in my truck and found out mine is considerably quicker than his (I thought it would only be a little quicker).



I was wanting to perfect the launch and get the time down as low as I can, so I can go tell him that my truck, weighing in about the same as his can do it in 8. 95 seconds for example (I'm down to 9. 23 seconds just messing around so maybe I can get under 9 sec's). But if he says, "B. S. " I'll march his a$$ out there and say, let's go see. It would nice to be ~3. 5 seconds faster to 60 mph than his truck. Hehehehe.



Help me out here fellers, I'm trying to show off the ole Cummins power.



- JyRO

 

[hammersley]

What is a great 0-60 time.....

AND not from a Carrier or rocket sled... ... ... . with an auto, 4x4, 450-475 HP... ... . just curious.

 

[JyRO]

hammersly - I don't know what you mean by a Carrier or rocket sled. But you're about 150 - 175 h. p. more than me. And I think your auto would be quicker than my manual. So, I'd have to guess your truck could go 0 - 60 mph in maybe the 7 second range. That's purely a guess. That's blame fast for a 7,000# truck.



- JyRO

 

[jarsong]

Originally posted by JyRO

jarsong - I thought about trying launching in 3rd. But I didn't. I can tell you that if I try to leave from a dead stop smoothly in 3rd instead of 2nd with 3. 54's, its more hairy than you think it would be. I guess I didn't try it because I'm trying to see how low I can get my 0 - 60 mph time, for curiosity only. I don't want to tear anything up, or add power to reduce the time. My curiousity stems from a PSD guy here at work telling me that he brought his '97 PSD with auto, 4. 10's, 1 ton, LB, crewcab down from ~13. 5 seconds 0 - 60 mph, to about 12. 5 seconds 0 - 60 mph. All by larger downpipe and tailpipe, and intake mods. Don't get me wrong, he has a nice truck, and I believe what he's told me. But I put the G-Tech in my truck and found out mine is considerably quicker than his (I thought it would only be a little quicker).



I was wanting to perfect the launch and get the time down as low as I can, so I can go tell him that my truck, weighing in about the same as his can do it in 8. 95 seconds for example (I'm down to 9. 23 seconds just messing around so maybe I can get under 9 sec's). But if he says, "B. S. " I'll march his a$$ out there and say, let's go see. It would nice to be ~3. 5 seconds faster to 60 mph than his truck. Hehehehe.



Help me out here fellers, I'm trying to show off the ole Cummins power.



- JyRO

If your running the stock clutch I would make it a habit that's for sure. It won't last long... What I do is NOT give it anything near full power until I've released it fully which happens pretty quickly, then I mash it. There is a enough power there to get out of the lower RPM's pretty quickly. Go play.

jarsong

 

[MD500E]

I am not to sure on the best way to launch a 6 speed as i am a slush box driver. My truck is just shy of 500hp rear wheel and I have calculated it to go 0-60 in around 4 seconds. My brother has a CLK55 AMG Mercedes that runs the same 1/4 mile as my truck about 13. 5 His car is claimed to be about 4. 8-4. 9 sec to 60 and I pull about a truck length ahead of him from the start with a 4x4 12lb of boost launch.

 

[jarsong]

Originally posted by MD500E

I am not to sure on the best way to launch a 6 speed as i am a slush box driver. My truck is just shy of 500hp rear wheel and I have calculated it to go 0-60 in around 4 seconds. My brother has a CLK55 AMG Mercedes that runs the same 1/4 mile as my truck about 13. 5 His car is claimed to be about 4. 8-4. 9 sec to 60 and I pull about a truck length ahead of him from the start with a 4x4 12lb of boost launch.

Couldn't imagine doing a 13. 5 quarter... Faster than most 5. 0 Mustangs... .

jarsong

 

[MCummings]

What I do at the Track...



6-speed, South Bend CLutch OFE. . 2wd and 7,500Lbs... .

HX-40/18 Drag COMP.



Rev 'er up to 2,500 at the line, and as the 2nd Yellow Lights, Start letting the clutch out, and when you feel some good boost, let it out all the way (should be about 2,200RPM) and run it up to about 2,700-2,800 and shift as fast as you can into 3rd (Don't lift off the go pedal). You'll get some spin, If it spins excessive, then shift a little earlier, if it just chirps,, try shifting a little later.



Depending on your truck,, it depends on the point where your truck starts slowing down, but 0-60 times are all about RPM, don't hink, "oh the torque will get me there",, it will, but not fast. Spin that motor. I shift at 3,000 and wil probably shift higher with the new mods I am doing.



Best run in my 24V was a 14. 3@98



On my 12V I launch at 17PSI and 2,700RPM, and shift at 3,500-3,800RPM.



Best run in my 12V using 2wd was 13. 7@95.



Merrick

 

[JyRO]

MD500E - That's friggin awesome. I'd never guess even 500 h. p. would be that much quicker than 300 h. p.



Merrick - I guess I'm going to have to look around a lot more for the right spot to do it around here. The problem I'm having is, the G-Tech. It says in the instructions, that once its flashing, "GO," that any little movement it detects, it starts the timer. What I'm doing is holding the brake when it says go, and trying to coordinate revving it up with my brake foot and get the clutch to just the right spot. Then as I take my foot off the clutch it gets real hard to operate the throttle pedal smoothly. I may have to try a light operation of the parking brake to ensure it doesn't move ... then as the truck starts moving, I'll have my hand on the P. B. release and pop it off. Believe it or not, my '04 130 h. p. Corolla went 0 - 60 m. p. h. in 7. 59 seconds. Granted it only weighs ~2,600 lbs, but that's pretty good for a stock 4 banger that gives 40 m. p. g.

 

[Chris N5CWM]

Went to the Rockingham NC dragway last year and ran the Test and Tune night. Did a 16. 2 @ 86, with only an early Edge "3-light" fueling module. It's the predecessor to the COMP box. In-cab adjustable with 3 levels or off. Since then I've installed Bosch 275 injectors. GTECH (the new one) shows my 0 to 60 is 7. 645 seconds, and the 1/4 mile was 15. 5 @ 92 MPH. Starting out in 2nd gear, 2WD. Since I know the weight of my truck and input the info, it calculates HP and torque too. 306 HP and 664 Ft Lbs. Never have dyno'd it. Would love to do that and find out how close the GTECH is.



The new GTECH is cool. . you can make some runs and bring the unit back in, hook it up to the computer and download all the runs. Different vehicles too.



Here is a screenshot of my three runs.



My strategy for getting a good launch with a manual trans such as the NV4500/5600 is to blip the throttle, or rev it to build boost, then launch at an RPM that will hold the torque curve and give a little wheelspin without bogging the engine and boost.

 

[MD500E]

Just curious, how much does the G-tech cost. Seems like it would be a fun little toy to play with.

 

[TurboDog]

I bought a new G-TECH PRO METER today on EBAY for $49. 95, the guy had over fifty of them for sell. My question is how do they work?
The picture showed only a cigerette plug to hook it up. Does it hook into the truck computer system also?

 

[JyRO]

TurboDog - It gets power from the cigarette lighter. Other than that it works on input from a very accurate accelerometer, and plugs that information into formulas. It integrates the information with respect to time to give you the results.



Therefore the positioning of the device is critical. For one, to do a h. p. check, you have to input an accurate weight of the vehicle plus driver. 2nd, the device has to be mounted level, and pointed straight down the road (so it measures fore-aft forces correctly, no angular vectors). The devices gives you g-force reading to help you set it to level.



Scientifically, it works quite accurately. The problem is of the human factors (error) that can be introduced. One of the better features is that it measures real h. p. to the ground. On the same token, wind resistance will slow down your acceleration, so a true 1:1 geared h. p. run will loose accuracy due to wind drag.



I'd still rather put it on a dyno, but from the times I've messed with it, it seemed to be very accurate.



As far as 0 - 60 mph times, as long as you have it set level and straight down the road, the error should be next to nothing. Wind drag effects every car 0 - 60 mph. The G-tech measures the g-force and based on how much time at what amount of g-force, it knows when you are going 60 mph. It seemed very accurate when I watched my speedometer.



I mounted it on my sunvisor, because the softness of the sun-visor dappened out the harshest vibrations, and putting it up there put it more in my line of sight.



- JyRO

 

[TurboDog]

Thanks for the info JyRO. Sounds like a fun toy, I will have to go weigh my truck!

 

[kaptn]

I'm not sure. Any of you guys have a suggestion or 2? Should I just leave it in 4X? Only problem is, I'm doing this on dry pavement and thought I should get out of 4X as soon as I can.

I have over 100 launchs in 4x4. I drop it out of 4x4 after 2nd gear with my auto as I am told leaving it in effects the top end. I cant see it hurting anything if you leave it in though. I am no expert just a test dummy