Track results with my Limited

[motorhead]

Throw some 3.08 gears in there... what?!   I'd lock the converter in 3rd before changing the tires.

And if you think 790s is rich, you should see the mid-900s I am getting in the TBSS on 40% ethanol. LOL.

[gusszgs]

I calculate 9% slip which is not bad.  Calculated speed at 5491 rpm is 124.3 mph with a 26" tire.  PL shows 113 mph at that rpm....113/124= 91%   and 100%-91% equals 9%

sorry, 113 is the timing ticket speed...which should be more accurate than the PL speed

Thanks Steve
Any approx change/guess in trap rpm by going to a 28" tall tire? I think I'd benefit from this if my trap rpm was closer to 5k. I wouldn't expect that much buy could I expect a few hundred rpm?

[aminga]

Not sure how accurate the PL CS factor is........I did the TCI one as well and it's showing 12.9%

You can adjust the slip factor.  At 70MPI in 3rd gear with the converter locked it should be close to zero.  If it isn't adjust the RatioHighGear parameter in PLC.ini.  The number thar gets plugged in is RPM/MPH in that gear.

[ConverterSlip]
RatioLowGear=0
RatioMidGear=48
RatioHighGear=31.5

[Steve Wood]

I calculate 9% slip which is not bad.  Calculated speed at 5491 rpm is 124.3 mph with a 26" tire.  PL shows 113 mph at that rpm....113/124= 91%   and 100%-91% equals 9%

sorry, 113 is the timing ticket speed...which should be more accurate than the PL speed

Thanks Steve
Any approx change/guess in trap rpm by going to a 28" tall tire? I think I'd benefit from this if my trap rpm was closer to 5k. I wouldn't expect that much buy could I expect a few hundred rpm?

There is about 8% difference going to a 28" tire which will put you back in the power band a bit better.  It will also give you a longer foot print at launch for better/more consistent traction.

at 5000 rpm, 28" tires will give you about 6 mph more over the 26" and is about the same as going to 3.23 gears except you get more traction.

If you want the speedometer to read correctly, it takes a 27 tooth speedometer gear as opposed to the 30 tooth stock gear

[gusszgs]

I calculate 9% slip which is not bad.  Calculated speed at 5491 rpm is 124.3 mph with a 26" tire.  PL shows 113 mph at that rpm....113/124= 91%   and 100%-91% equals 9%

sorry, 113 is the timing ticket speed...which should be more accurate than the PL speed

Thanks Steve
Any approx change/guess in trap rpm by going to a 28" tall tire? I think I'd benefit from this if my trap rpm was closer to 5k. I wouldn't expect that much buy could I expect a few hundred rpm?

There is about 8% difference going to a 28" tire which will put you back in the power band a bit better.  It will also give you a longer foot print at launch for better/more consistent traction.

at 5000 rpm, 28" tires will give you about 6 mph more over the 26" and is about the same as going to 3.23 gears except you get more traction.

If you want the speedometer to read correctly, it takes a 27 tooth speedometer gear as opposed to the 30 tooth stock gear


Wow 6 mph is more than I thought, which is great. So right now I have 27" tall MTDR's. By going up to a 28" I could expect 2-3 mph more maybe. That would put me right about where I should be at 115-116 mph I think.

[Steve Wood]

Sorry, I was using 26 for the slip...but yeah, 3mph

[Steve Wood]

12.5% like Brad stated...guess he knew they were 27's lol

Still not bad, but locking the converter around 90 mph will kick it up a bit...  if the converter is a good one that can be locked.

[motorhead]

I've locked jobber remans at higher power levels. Do it!

[gusszgs]

I've locked jobber remans at higher power levels. Do it!

Ya but what size of converter?
I'm running a 9.5"

[Steve Wood]

For once, I have no words

[motorhead]

I've locked jobber remans at higher power levels. Do it!

Ya but what size of converter?
I'm running a 9.5"

12" stock style restall in the Monte on spray; rolled out, hit the button, and had the converter locked in 2nd and 3rd.  That being said, I had a 10" TCI Super Street Fighter in my Buick at one time and locked it up too.  The things you do when you are young and operating on a budget...

[motorhead]

For once, I have no words

Disagree with something?

[gusszgs]

For once, I have no words

    

[Scoobum]

Steve, Wallace asks for the tire circumference for their calculation. What I did was go to MT's site and look it up for Jims tire size. I then plugged the numbers in.

Jim, don't be a fukn hero and lock that convertor just to gain a couple MPH. Your solidly in the 11's...and will get faster when the October air gets here. I had a 3400 LU convertor when I ran a 6152...and it didn't last long locked...as I always had Eric lock them for me via his chip. Consult with David before locking it.

[Scoobum]

Steve...what RPM does the stock cam in Jims engine blow its load? 5200-5300? If that's the case...then a 28" inch tire should have the RPM's come in perfect at the traps. He might net a better short time with the 28's as well.