whtrice

iTrader: (6)

Also what kind of turbo you may be using too.

Lots of variables here but I don't consider the question useless.

Mellon Racing

iTrader: (38)

FWIW we usually keep tq in the 400-435 area on stock shorties but I do have a customer that touched 465 and he's still going strong. This is measured with VD which is close to a DJ. I do remind my customers that it may not be a good idea to roll 5 deep up a hill while going WOT in 5th gear

asubennett

iTrader: (5)

My OP made the point that 450 is an arbitrary number, however, you can not argue with, if you read or troll around this forum that 450 has not become some magical threshold, the crack that will break your mama's back if you will, that is not to be crossed.

That is great your motor has lived at higher levels for so long. Congrats.

I do not view my post as arbitrary, I am sorry that you did.

JohnBradley

iTrader: (30)

This is incorrect. What is 5,000 lbs of roller weight to accelerate? What is the LC (load control) that is standard on almost ALL DJs now? The only thing our dyno does differently from most DJs is the belt that ties the rollers together exactly like a Mustang.

When I post I post accurately. 400 ft lbs is still the seeming suggestion for total torque to stock rods, not the golden rule. I have seen them break at less and I have seen them hold more.

Here is an average time line before stock rod failure (someone wanna make an excel graph?)-

400 ftlbs- 49,000 miles
425 ft lbs- 2 year
470 ft lbs- 3 weeks
491 ft lbs- 3 days

I cant speak for the other owners, but the 49,000 I put on my car includes 150 dyno pulls and 7-10 romps per week at full power.

EVOlutionary

iTrader: (38)

Sorry, I don't own a dyno so I am lost a bit with what you are saying. Are you saying that most DJ's have a 5000 pound total weight for the rollers?

Are you also saying that the DJ's have some sort of electric or mechanical brake that can change the load based on inputs into the computer? You can set it to a 2000 pound load for a light weight Civic or to 3200 pounds for an EVO to show what the car is actually making in real world conditions?

I'm not sure why you italicized "exactly like a Mustang Dyno". Are you saying that Dynojets DO tie the two rollers together to get an accurate reading on AWD cars, or that they do not? If so, can you explain why shops such as AMS and Switzer use Mustang dynos to do some of their testing on AWD cars such as the Skyline and Porsches?

As for your Excel graph - sure, no prob. If you want to post info as to which cars made what torque and for how long before the rods failed I would be glad to do so. I know from first hand experience that mine has made 450 plus for over 3 years (high 400's for the past 2 years) under the guidance of two great tuners with a lot of race abuse during that time. . .

10.9 at the strip for many passes (at least 10 drag days)
two to three drivers autocrossing it banging off the rev limiter at 8000rpm
many track days at Mid-Ohio, Gingeman, Grattan and Blackhawk also running it out to redline at 8K and pulling hard in 4th and 5th gear . . .

Once again I state that the amount of torque your motor can hold is directly proportional to the quality of tuning. If you are getting a lot of detonation at any power levels your rods will not last long. . .

p.s. my car has over 150 dyno pulls at that power level . . .

asubennett

iTrader: (5)

Those above measurements you listed - I assume since you are a fan of 3rd gear dyno pulls each of those above motors made that power in 3rd gear and consequently the motor experienced a little more than what you have listed on during your 7-10 romps per week that may have included fourth gear run outs....

Is that a fair assumption?