the truth hurts
Banned
Joined: Apr 2006
Posts: 1,875
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From: Naperville, IL
On a Dyno:
Warm the engine up completely !!
Then, using 4th gear:
Do Three 1/2 Throttle dyno runs from 40% - 60% of your engine's max rpm. Let it Cool Down For About 15 Minutes
Do Three 3/4 Throttle dyno runs from 40% - 80% of your engine's max rpm. Let it Cool Down For About 15 Minutes
Do Three Full Throttle dyno runs from 30% - 100% of your engine's max rpm. Let it Cool Down For About 15 Minutes
Then you're ready to do whatever you want with it.
Now on topic:
a 4000 stall convertor, a T400 trans, and a 9"... yeah, you're losing a lot through the drivetrain on a dyno, but I don't think the numbers are terrible. I recall one of the sponsors saying in here that they had a car with a big stall, big rear, and T400 dyno in the 400's and run 9's.
man that's a solid mid/high 10 second pass at 125-127 MPH... 
See... makes the hurtful dyno numbers seem like a bogus bad dream 
fwiw, the car in the pic that I posted that was similar; ran like a 7.0 1/8th on stock wheels right after dynoing
See... makes the hurtful dyno numbers seem like a bogus bad dream fwiw, the car in the pic that I posted that was similar; ran like a 7.0 1/8th on stock wheels right after dynoing
398 rwhp through a 9" w/ 4.11's th350 w/ 4800 stall, and a 383 carb'd motor and 28 x 11.5 et streets. 11.16 @ 122 1.54 60ft just shows you how much power is being ate up through the stall and rear.
Tech Resident
Joined: Jan 2006
Posts: 5,117
Likes: 3
From: Philly
Dyno numbers...who cares?
I've heard of T56 -> TH400 swaps costing 90 rwhp. And the car ran faster at the track.
With a stalled TH350 AND a Moser 9-inch with 4.10's (a very parasitic gear), I wouldn't surprised if it was costing you 50-100 rwhp. Switch to a 4L60E and a 10-bolt with 2.73's and I bet you'd gain ridiculous amounts of power on the dyno - and suck at the track.
You have a hugely parasitic setup. Don't worry about it. Your motor's making good power.
I've heard of T56 -> TH400 swaps costing 90 rwhp. And the car ran faster at the track.
With a stalled TH350 AND a Moser 9-inch with 4.10's (a very parasitic gear), I wouldn't surprised if it was costing you 50-100 rwhp. Switch to a 4L60E and a 10-bolt with 2.73's and I bet you'd gain ridiculous amounts of power on the dyno - and suck at the track.
You have a hugely parasitic setup. Don't worry about it. Your motor's making good power.
Dyno numbers...who cares?
I've heard of T56 -> TH400 swaps costing 90 rwhp. And the car ran faster at the track.
With a stalled TH350 AND a Moser 9-inch with 4.10's (a very parasitic gear), I wouldn't surprised if it was costing you 50-100 rwhp. Switch to a 4L60E and a 10-bolt with 2.73's and I bet you'd gain ridiculous amounts of power on the dyno - and suck at the track.
You have a hugely parasitic setup. Don't worry about it. Your motor's making good power.
I've heard of T56 -> TH400 swaps costing 90 rwhp. And the car ran faster at the track.
With a stalled TH350 AND a Moser 9-inch with 4.10's (a very parasitic gear), I wouldn't surprised if it was costing you 50-100 rwhp. Switch to a 4L60E and a 10-bolt with 2.73's and I bet you'd gain ridiculous amounts of power on the dyno - and suck at the track.
You have a hugely parasitic setup. Don't worry about it. Your motor's making good power.
A4 eats RWHP too. Pretty much any Big Stalled car is going to make crap Dyno numbers it seems.
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Tech Resident
Joined: Jan 2006
Posts: 5,117
Likes: 3
From: Philly
Haha, don't compare a 4L60E to a TH350/TH400/4L80E. The 4L60E is a very efficient automatic by comparison. The others will suck rwhp up like a sponge by comparison.
I use the chassis dyno to break in new engines. What better way to control conditions and monitor everything? I keep a close eye on coolant and oil temps, oil pressure, etc. Start off with a light load for a few miles, then start commanding more load from the power absorber and keep varying the RPM. After about 50 miles of this, oil temps start dropping and the engine gets happier.
Of course this is with a load dyno, won't work for guys with intertia only.
Scott
Of course this is with a load dyno, won't work for guys with intertia only.
Scott
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Joined: Dec 2002
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From: Chattanooga,TN