dyno sheet pic need gear/tire info

Randy N Connie

Registered User
Here is a picture of a dyno sheet from the 2005 OK Shootout.

What gear would you run and tire size per gear used.
To come up with best ET.

AOD 2400 stall NON-LOCK. I can switch to from stock gear
to 4:10 and tire height ?
Or to 3:73 and tire height ?

I am switching from a MPIII blower to a A/R 1.7 blower.
with addition of SNOW INJECTION. So my numbers I
would hope to be around. 280 rwhp plus.

Thanks Randy
 

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I have found a 4:10 gear rearend, Iron that I can buy.
It suppose to have around 1000 miles on it. I am going
to find out the shipping cost in the morning. And then
buy it.

Then I need to buy the widest racing only slick.
That will fit under the fenders. And fit 16 inch
SC Bird rims. I need a tire that is sticky enough
to twist off my axles.

So what is the tire brand & name I need ?

Thanks Randy
 
Randy N Connie said:
I have found a 4:10 gear rearend, Iron that I can buy.
It suppose to have around 1000 miles on it. I am going
to find out the shipping cost in the morning. And then
buy it.

Then I need to buy the widest racing only slick.
That will fit under the fenders. And fit 16 inch
SC Bird rims. I need a tire that is sticky enough
to twist off my axles.

So what is the tire brand & name I need ?

Thanks Randy

Randy,

IMO, Hoosier Quick Time Pros or M/T ET Drags are about as sticky as your going to find....If your planning to go over 120 mph in the 1/4 you should probably just get the 27" tires for a little more breathing room.

Chris Wise and a few others around here had the Hoosiers, I've got the M/T Drags.

David
 
I don.t think that I will be getting anywere ner 120 mph
on the 1/4 mile with my motor. But I hope to run well
below 13.5.

Last year at the shootout ,The fastest car in my
class ran 13.8 .
I think It will take 13.3 maybe lower to win this
years Shootout in my class.I need more traction.
60 foot times have been 2.050 to 2.200

Thanks Randy
 
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Where is the best place to buy M/T OR hoosier slicks for 16 inch rims?
27 to 28 inch tall.

I had a web address for a gear ratio, tire size for the 1/4 mile.
I lost it. anyone have a web address to figuar what would
be the best tire size to use in the 1/4 with 4:10 gears
with AOD trans?
 
Those calculators will not really work very well because the converter slips but we don't know how much exactly. I'd guess about 500rpm.

Summit or Jegs have those tires, but SCP also has pretty good prices on the MT's so check with Bill.
 
Randy N Connie said:
Where is the best place to buy M/T OR hoosier slicks for 16 inch rims?
27 to 28 inch tall.

I had a web address for a gear ratio, tire size for the 1/4 mile.
I lost it. anyone have a web address to figuar what would
be the best tire size to use in the 1/4 with 4:10 gears
with AOD trans?

Randy, PM me your email address and I will send you a Excel spreadsheet that will do what you want.

Mike
 
Dyno

Randy,


I will guarentee that you will be way over your 280 rwhp mark with that AR


My car made 311 rwhp On completely stock longblock with 125k with Daves AR kit and through a Liquid to air IC setup


If you have done Headwork and cam Im assuming you will be over 350rwhp
 
Randy N Connie said:
The converter was dynoed with trans at Lentech .
Stall is 2400 9.5.

Thanks Randy

Not sure what you mean by that, but my point is that the converter does slip at all rpms, not just below it's stall speed. For example, I datalogged Tony's car during torque converter lock up (his is a locking converter - 4R70W -, unlike anyone with a high stall converter in an AOD). Before lockup - 5120rpm After lockup - 4680rpm.

From that I am assuming that there is about a 4-500rpm loss on a 2400rpm stall converter. That's just a guess though, each converter is probably a little different depending on design.

That is why going to a non-locking converter will cost you HP and MPH.
 
Dave D.
When you buy a trans and converter from Lentech.
He has a dyno for transmissions. He test runs the
trans and converter together.

I take it this is to insure that the trans works proper.
and the stall for the converter is set right to match
the order that was placed for a stall of 2400..

And the coverter in the car is 9.5inches in diameter.

I still need to have an guess on tire OD
needed for 4:10 gear. So I can beat up
on you 5 Speed guy's. Shouldn't take a
hole lot.:p

Randy
 
I'd say that with 280HP but over 400lb ft of TQ, you might be shooting yourself in the foot with a 4.10 gear at the higher RPM's...why not go with a 3.73 and make use of all that TQ??

however, with a 4.10, that this should leave the hole like a mad man!!!!!

Best of luck with what ever you go with man!
 
If anyone looked closely at that dyno chart, you would see that peak HP is 265rwhp and peak torque is unknown, but likely around 365rwtq. The reason for the extreme high numbers are a reflection of a gear shift that occurred earlier in the pull but is not shown on the chart and the chart doesn't really show an absolute peak HP because the run was ended before HP really fell off any. We were a little concerned about a couple different things that day and decided not to push the motor any harder.

It might have continued to make 265rwhp all the way to 6000rpm but we'll never know that for sure. This makes it difficult to say what rpm would be best to be trapping at. The general rule is to trap beyond peak HP by at least a few hundred rpm. But how high would that be? It's really hard to say. Stock valve springs typically start to go south pretty bad after 5500rpm... but if they are shimmed to max pressure and checked for consistency you might get 6000rpm out of them with a margin of reliability. It's just hard to say.

So if you assume 500rpm slip in the converter and a 26" tire, and you want to be trapping at about 6000rpm at 101mph then the logical gear choice would be 4.10's.
 
SCreamin said:
I'd say that with 280HP but over 400lb ft of TQ, you might be shooting yourself in the foot with a 4.10 gear at the higher RPM's...why not go with a 3.73 and make use of all that TQ??

however, with a 4.10, that this should leave the hole like a mad man!!!!!

Best of luck with what ever you go with man!

Because the motor will be above 4500rpm for 99% of the 1/4 mile. Anything below that is used up in the first .85sec (or about 20ft). :)
 
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