Time to make it a track truck

[LETHAL HEMI]

As of march 1st i was told if you are caught street racing you will loose your car/truck. They are cracking down ever since the deadly wreck that killed 5 guys.

So since i spray what would be a good combo for my truck 4.10's and 28" tires or 4.56 and what size tire?

[Spedly]

What is your current combo?
What mph do you trap at?
What rpm do you trap at?
Do you plan to go faster? How much faster?
What are you willing to spin the motor to?
where does your power curve start falling off
How much converter slippage are you seeing through the traps?

The more you know the better you can fine tune your combo. Since you can run 16's your tire options are a lot better.

[LETHAL HEMI]

what is your current combo?
What mph do you trap at?
What rpm do you trap at?
Do you plan to go faster? How much faster?
What are you willing to spin the motor to?
Where does your power curve start falling off
how much converter slippage are you seeing through the traps?

The more you know the better you can fine tune your combo. Since you can run 16's your tire options are a lot better.

well i do run 16s right now with a 28x11x16 m/t. As of now my best 60' is 1.79 and i trap @104.8. I dont know what rpm i trap at maybe next time i go ill find out. I want 11's n/a even if that mean going stroker in the future.

As for converter slippage i wont know how to tell and only a dyno will tell my curves which i will be getting soon once i recieve my 85mm tb

[otter1363]

Heres a chart to help you decide on tire dia. Left is the mph you want to hit the traps at and top is tire dia. The chart shows the prm ranges for MPH v/s dia.

** edit** this considers you have 4.56 gears and are 1:1 in the trans ratio -

[LETHAL HEMI]

Is that going off of 3.92 gearing

[otter1363]

sorry - added edit... 4.56:1 gears

[LETHAL HEMI]

sorry - added edit... 4.56:1 gears

do they have on for other gear ratio like 4.10 or 3.92

[sldhemi]

I'll look later at work, but if I'm not mistaken 4.56 with a 28" tire will allow 110-112 at around 6000rpm.. And around 118mph at 6500.. Take away a few mph for tq converter slip. I think jay told me he crosses the traps just under 6500 and he traps 112-113

if your making it track only, put 4.56 with about a 30" tire and you'll be good to go...

[otter1363]

I just did a spread sheet. Heres the math (fyi)
RPM= (mph*gear*336)/tire dia.

here are some charts for 3.92 and 4.10

[viperkota]

I just did a spread sheet. Heres the math (fyi)
RPM= (mph*gear*336)/tire dia.

here are some charts for 3.92 and 4.10

are these for in a 1:1 gear on the tranny?

[LETHAL HEMI]

I'll look later at work, but if I'm not mistaken 4.56 with a 28" tire will allow 110-112 at around 6000rpm.. And around 118mph at 6500.. Take away a few mph for tq converter slip. I think jay told me he crosses the traps just under 6500 and he traps 112-113

if your making it track only, put 4.56 with about a 30" tire and you'll be good to go...

well it will be a track racing only but i would still want to drive on the street. I would still keep the exhaust on, a/c will still be on. I just wont be doing anymore roll racing on the street. All my racing will be on the track

[otter1363]

are these for in a 1:1 gear on the tranny?

Yah - 1:1 ratio

[LETHAL HEMI]

ok well i went last night and i cross the traps at around 5000 rpms

my times were

12.80@104.2------8.11@85 mph--------1.81 60ft

12.78@104.4-------8.10@85mph--------1.82 60ft

lastnight was about 6-8% more humid than the last time i ran

im still going to spray so im guessing 4.10 with a 28" tire

[dline]

you need to rev the piss out of that thru the traps

[LETHAL HEMI]

you need to rev the piss out of that thru the traps

i shift at 6500 every shift. i was actually looking at the charts and im leaning toward 4.56 cause if i trap around 115 with the nitrous i will cross the trap at 6300 with a 28.5 in tires which will be pushing it.

do ya think im risking going into 4th on the bottle?

[otter1363]

cant you just drop the shifter into (2) to keep it in 3rd? Dunlop makes a 275-55-17 that has an overall dia of 28.8"

[Spedly]

remember to factor in the converter and actually measure your tires then see if you can find out about how much they grow. MT/MH/Hoosier should be able to give you a good idea of how much they will grow. Once you make the jump to strictly track truck you can really nail down your combo to get every last bit out of it.

[LETHAL HEMI]

cant you just drop the shifter into (2) to keep it in 3rd? Dunlop makes a 275-55-17 that has an overall dia of 28.8"

i do that everytime and still cross at 5000

[LETHAL HEMI]

remember to factor in the converter and actually measure your tires then see if you can find out about how much they grow. Mt/mh/hoosier should be able to give you a good idea of how much they will grow. Once you make the jump to strictly track truck you can really nail down your combo to get every last bit out of it.

how do you factor the converter? I dont understand when you say that. I will try to contact m/t and see how much they grow. Im ready to make it a track/ street truck meaning i race only at the track and use the truck to go cruising on the street. My only concern is getting into 4th gear while i spray, which i barley do

[LETHAL HEMI]

M&h has a 30x14x16 cheater slick but might be to wide for a 10" rim, or does anyone know where they sale a 28.5 tire for 16s cause i cant find it. Im still going to call m/t and see how much they grow

[Spedly]

how do you factor the converter? I dont understand when you say that. I will try to contact m/t and see how much they grow. Im ready to make it a track/ street truck meaning i race only at the track and use the truck to go cruising on the street. My only concern is getting into 4th gear while i spray, which i barley do

Since you can't lock the converter under wot when your going through the traps your not exactly 1:1 like the calculators your looking at. The easiest way to get close it make a pass with the nitrous on and see where your rpms are now take that and compare it to what the calculator said it should be at for your mph. You'll probably be a couple hundred rpms off. Its not going to be a bunch but if may be enough for you to want to step up to a larger tire if you plan on going faster in the future.

[LETHAL HEMI]

Ok thanks

[LETHAL HEMI]

LET ME SEE IF I GOT THIS CORRECT:

according to the gear chart at 1.1 it says that with 3.92 and 28" tire i will cross at 5029@105 but i cross at 5400 so lets add 300 rpm to the chart

with 4.10 the charts says 5260 at 105 but adding 300 would put me at 5560 crossing at 105 and on bottle lets say 115 mph the chart says 5761 but adding 300 would be 6061

with 4.56 gears the chart says 5899@105 but adding 300 rpm will put me at 6199 and if i trap 115 on bottle it 6461 and adding 300 would be 6761 and since i redline at 6600 that will put me into 4th gear.

so should i lower my nitrous to a 75 shot instead off a 100 shot or start spraying in second gear.

i want to make a good gear swap and not touch it no more. unless i use a 30 in tire which i cant find. anyone know where a 29'' or 30'' tire could be bought for a 16 in rim

30in tire crossing a 115 would put me a 6031 but adding 300 would be 6331 but i really never spray so a 30in tire would hurt me N/A

[RandTx]

As of march 1st i was told if you are caught street racing you will loose your car/truck. They are cracking down ever since the deadly wreck that killed 5 guys.

So since i spray what would be a good combo for my truck 4.10's and 28" tires or 4.56 and what size tire?

got a link to that law? Haven't even heard of such a bill in process.
-
Think 5 or more years ago they made it a felony though.
That would be bad since TX lumps exhibition of speed as street racing.... chirp your tires and they could steal your ride.. well for most not their ride sine often a finance co has a lien on it.

I guess you've seen this, and yes you should stop street racing
http://www.khou.com/news/local/Harris-County-Sheriffs-Office-gives-warning-to-street-racers--84349522.html

[RandTx]

LET ME SEE IF I GOT THIS CORRECT:

according to the gear chart at 1.1 it says that with 3.92 and 28" tire i will cross at 5029@105 but i cross at 5400 so lets add 300 rpm to the chart

with 4.10 the charts says 5260 at 105 but adding 300 would put me at 5560 crossing at 105 and on bottle lets say 115 mph the chart says 5761 but adding 300 would be 6061

with 4.56 gears the chart says 5899@105 but adding 300 rpm will put me at 6199 and if i trap 115 on bottle it 6461 and adding 300 would be 6761 and since i redline at 6600 that will put me into 4th gear.

so should i lower my nitrous to a 75 shot instead off a 100 shot or start spraying in second gear.

i want to make a good gear swap and not touch it no more. unless i use a 30 in tire which i cant find. anyone know where a 29'' or 30'' tire could be bought for a 16 in rim

30in tire crossing a 115 would put me a 6031 but adding 300 would be 6331 but i really never spray so a 30in tire would hurt me N/A

You have to consider the TC slippage and the actual running diameter of the tires.
think we've had some guys trap 105 with 4.56 and MT 295's which have a running diameter of under 27"
Most likely you could easily have headroom with a 28 or 29" tire.

[LETHAL HEMI]

got a link to that law? Haven't even heard of such a bill in process.
-
Think 5 or more years ago they made it a felony though.
That would be bad since TX lumps exhibition of speed as street racing.... chirp your tires and they could steal your ride.. well for most not their ride sine often a finance co has a lien on it.

I guess you've seen this, and yes you should stop street racing
http://www.khou.com/news/local/Harris-County-Sheriffs-Office-gives-warning-to-street-racers--84349522.html

well i doubt it has past but i know they are going to try to make it pass either way ill stop the racing i have a kid on the way and want to see it grow up

[LETHAL HEMI]

You have to consider the TC slippage and the actual running diameter of the tires.
think we've had some guys trap 105 with 4.56 and MT 295's which have a running diameter of under 27"
Most likely you could easily have headroom with a 28 or 29" tire.

but remeber i use nitrous sometimes i havent yet just cause i havent hooked it up and i really wont be using it much cause i have a stock bottom end and dont want to blow it yet. Im leaning to go back to 4.10s even though 4.56 would be great for n/a unless i can search and find me a good set of 29in tires

[RandTx]

but remeber i use nitrous sometimes i havent yet just cause i havent hooked it up and i really wont be using it much cause i have a stock bottom end and dont want to blow it yet. Im leaning to go back to 4.10s even though 4.56 would be great for n/a unless i can search and find me a good set of 29in tires

OH if that was your NA mph then we'd need to know your rpm and mph on the juice.
I've never tested mine at that speed but my est on mine with 4.56 and the M&H 390's is about 115 mph at 6400 rpm. (with about 7% tc slippage)

[RandTx]

well i doubt it has past but i know they are going to try to make it pass either way ill stop the racing i have a kid on the way and want to see it grow up
as your kid would to have you around too as he or she grows up, as would we...
it's definitely a good plan to stop racing on the streets.

[LETHAL HEMI]

OH if that was your NA mph then we'd need to know your rpm and mph on the juice.
I've never tested mine at that speed but my est on mine with 4.56 and the M&H 390's is about 115 mph at 6400 rpm. (with about 7% tc slippage)

ill know about that on march 13th when i spray it. so ill wait till then i guess.

[RandTx]

If you want to start looking at 390's their advertised size is 29.5 12.5 x 17 they need at least a 10" rim width. On mine I had a set of 17x9 stock SST wheels widened an inch on the back and the result is just tucked in about as much as they can stand and still clear everything.

[LETHAL HEMI]

If you want to start looking at 390's their advertised size is 29.5 12.5 x 17 they need at least a 10" rim width. On mine I had a set of 17x9 stock SST wheels widened an inch on the back and the result is just tucked in about as much as they can stand and still clear everything.

do the M&H stick good cause they have a 30in tire for a 16IN rim. i have 16X10s in the rear

http://www.jegs.com/i/M-H/676/MHD-11/10002/-1?parentProductId=754718

PICTURE OF THE THREAD
http://www.jegs.com/webapp/wcs/stores/servlet/ProductDisplayPopup?storeId=10001&catalogId=10002&productId=754718&itemId=98970&langId=-1&showValue=1

[RandTx]

do the M&H stick good cause they have a 30in tire for a 16IN rim. i have 16X10s in the rear

http://www.jegs.com/i/M-H/676/MHD-11/10002/-1?parentProductId=754718

PICTURE OF THE THREAD
http://www.jegs.com/webapp/wcs/stores/servlet/ProductDisplayPopup?storeId=10001&catalogId=10002&productId=754718&itemId=98970&langId=-1&showValue=1

Yes they do.
Go join VTCOA and check out some the viper trucks running them, Also M&H is a sponsor at vtcoa so members can buy direct from M&H with a pretty decent discount.

On 390's one thing to keep in mind is the sidewall width overall they get narrower on smaller rims that stated rim size. My 390's on 10 wide rims are the exact same sidewall width as my 305-50-20's on 9" rims. Well under the 14+ in spec if it was on a 12" wide rim.

Now that cheater slick
http://www.mandhtires.com/store.php?crn=72&rn=307&action=show_detail

It's about an inch narrower tread with spec, Yet it's 14" sidewall width is on a 10" wide rim. Assuming you can easily get 16x10 rims allow for the full 14" width.
Actually since aftermarket wider wheels tend to have more outward offset that might work out just about right.

[LETHAL HEMI]

I just did a spread sheet. Heres the math (fyi)
RPM= (mph*gear*336)/tire dia.

here are some charts for 3.92 and 4.10

Good chart in determining if and when i have to change gears when i start to spray which will be next month. I want to keep the 28" tire as i would rather pay 190.00 a tire instead of 300.00 a tire