What should my MPH be in the 1/8th? Update 9-13-11 New 3.5 gear
08-30-2011, 03:43 PM
#21
ive always thought you needed to run a little richer when running meth, because of the stoich ratio is richer than that of gasoline? im just curious, not to hijack, just curious since im running 10.5 on 50/50 meth.
08-30-2011, 04:05 PM
#22
Target 11.5 AFR which is very safe. Running too rich can lift your ring lands and at that power level is more dangerous to the motor than running too lean.
I think that a #8 plug is fine in that setup. I've been from 10.3's NA on my old stroker to 8.9 on boost. I really should step up to a #9 plug for high boost though. I think that your expectations of 106 at anywhere near 4K pounds with only 10 psi is a bit ambitious. Granted that with a soft 60' like 1.57 you will MPH higher than you would with a 1.3-1.4. Bottom line, you aren't too far off the mark for what you have. Just lean her out a little.
I think that a #8 plug is fine in that setup. I've been from 10.3's NA on my old stroker to 8.9 on boost. I really should step up to a #9 plug for high boost though. I think that your expectations of 106 at anywhere near 4K pounds with only 10 psi is a bit ambitious. Granted that with a soft 60' like 1.57 you will MPH higher than you would with a 1.3-1.4. Bottom line, you aren't too far off the mark for what you have. Just lean her out a little.
08-30-2011, 05:25 PM
#23
Target 11.5 AFR which is very safe. Running too rich can lift your ring lands and at that power level is more dangerous to the motor than running too lean.
I think that a #8 plug is fine in that setup. I've been from 10.3's NA on my old stroker to 8.9 on boost. I really should step up to a #9 plug for high boost though. I think that your expectations of 106 at anywhere near 4K pounds with only 10 psi is a bit ambitious. Granted that with a soft 60' like 1.57 you will MPH higher than you would with a 1.3-1.4. Bottom line, you aren't too far off the mark for what you have. Just lean her out a little.
I think that a #8 plug is fine in that setup. I've been from 10.3's NA on my old stroker to 8.9 on boost. I really should step up to a #9 plug for high boost though. I think that your expectations of 106 at anywhere near 4K pounds with only 10 psi is a bit ambitious. Granted that with a soft 60' like 1.57 you will MPH higher than you would with a 1.3-1.4. Bottom line, you aren't too far off the mark for what you have. Just lean her out a little.
I am more just trying to see if my MPH is on par for my setup. I know it is hot out and I am losing some to that but I just would like to see a 6.60-6.70 in the 1/8th at this boost level. I would like to see this TC78 bring me into the 9's when I turn up the boost.
I am also still working on staging the car and getting up on boost and then bringing on the transbrake and 2-step.
Next time I head to the 1/4 mile track I will leave early and try to hit the scale.
Thanks for the help guys.
08-30-2011, 07:34 PM
#24
No, if you have your WB setup in a gasoline scale you use the same gasoline target AFR no matter which fuel or fuel mix you are running
09-09-2011, 06:47 PM
#25
Well I tried to hit a local scale and it is a military scale so you had to set up a appt.
I have the third member out and am swapping in the 3.5 gear vs the 3.0 in there now.
I have also leaned it out some and turned up the boost to 15#s, it feels like a different car now.
Also trying to see what if any different rear brake pads would help with trying to stage the car on the brakes while I have everything apart?
I have the third member out and am swapping in the 3.5 gear vs the 3.0 in there now.
I have also leaned it out some and turned up the boost to 15#s, it feels like a different car now.
Also trying to see what if any different rear brake pads would help with trying to stage the car on the brakes while I have everything apart?
09-13-2011, 05:31 PM
#30
Well I got the 3.5 gear vs the 3.0 gear with a 28" tire and what a difference. I am now seeing 18#s of boost at WOT were I was only seeing 15.7-16.2#s before. Car feels like a animal now that the converter is running in its effeciency range. I hope to hit the track on Thursday and Friday night for some times.
09-13-2011, 07:11 PM
#33
Launching!
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im curious to see how this goes as well. im running a very similar combo, just a little lighter vehicle weight...
i am at 11.2 afr and i agree the difference between 10 and 15psi feels like a whole different car
did you mention whether you had a .96 or 1.15 housing? and what size downpipe?
i am at 11.2 afr and i agree the difference between 10 and 15psi feels like a whole different car
did you mention whether you had a .96 or 1.15 housing? and what size downpipe?
09-13-2011, 08:21 PM
#35
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sweet i cant wait to see results, im using a 1.15 housing and 3 1/2" dowpipe/exhaust at about 3650lbs. im hoping to get to the track in october, im working on a crank case beather setup or evac now.. its smoking on 15psi on decel...
09-13-2011, 09:41 PM
#36
What suspension mods do you have and what tire are you running in the rear at the track? Try and leave on at least 8-9 psi, if not more like 10-11. I leave on 8-9 consistently now at 4100rpm and cut .19-.31 r/t's consistently. I could get 11 and pull more if I wanted, but I have been racing other people lately and it's been making a huge difference in the amount of races I've been winning. Once you learn to stage your car you will feel 100% comfortable in it and a lot of it down track will slow down, i know it did with me.
09-14-2011, 05:08 PM
#37
What suspension mods do you have and what tire are you running in the rear at the track? Try and leave on at least 8-9 psi, if not more like 10-11. I leave on 8-9 consistently now at 4100rpm and cut .19-.31 r/t's consistently. I could get 11 and pull more if I wanted, but I have been racing other people lately and it's been making a huge difference in the amount of races I've been winning. Once you learn to stage your car you will feel 100% comfortable in it and a lot of it down track will slow down, i know it did with me.
I got a 1.57 60' with that worn suspension and leaving on 6PSI so on 8-9 and some good suspension it should leave a whole lot better. But until it gets here next week I am out of driving the car till then.
09-15-2011, 05:23 AM
#38
10 Second Club
For a weight comparison, I'm at 3950 with me (190), 6 pt. CM bar, BMR K member & arms, Bogarts, ET streets, 5 gal. water tank and 4L80e. At 18# boost I suspect you might run right past the 106 estimate, good luck.
09-15-2011, 06:49 AM
#39
There is a HUGE gain with the TC78 from 10 to 12 psi. I think with 12psi and 11.2~11.5 AFR you will be at your goal. With a T78/6.0L, and 317's going from 10 to 12psi is 3~4 mph on my truck at 4875lbs; same 11.5:1 AFR. I also ran a TC76 with exact same results.