Dyno Results at MTI
Thread Starter
Racer
Joined: Nov 2000
Posts: 296
Likes: 0
From: Houston Texas
Dyno Results at MTI
I finally got my car dyno`ed today: A4,3500 Yank, 3:42 gear, Donaldson and programming by Ed W. Max. RWHP 320.1 / Max. RWTQ 371.9 and Max. RWHP 320.1 / Max. RWTQ 374.8
[Modified by Am I Badd, 5:10 PM 1/4/2003]
[Modified by Am I Badd, 5:12 PM 1/4/2003]
[Modified by Am I Badd, 5:10 PM 1/4/2003]
[Modified by Am I Badd, 5:12 PM 1/4/2003]
Race Director
Joined: Dec 1999
Posts: 11,799
Likes: 10
From: Houston Texas
St. Jude Donor '08
Re: Dyno Results at MTI (Am I Badd)
Can someone tell me what are these figures at the crank or flywheel?
[Modified by CorvetteSS, 5:33 PM 1/4/2003]
Melting Slicks
Joined: Jun 2000
Posts: 2,386
Likes: 4
From: Dallas / Fort Worth, Texas Texas
Re: Dyno Results at MTI (Am I Badd)
I've always been told 20% for A4's & 15% for 6 speeds - so 320 RWHP / .80 = 400 Fly Wheel HP --- ahhh how sweet it is ...
Congratulations !! People spend lot's of $$$ trying to get to 400 Fly Wheel HP ...
:cool: :cheers: :smash: :seeya
Congratulations !! People spend lot's of $$$ trying to get to 400 Fly Wheel HP ...
:cool: :cheers: :smash: :seeya
Race Director
Joined: Aug 1999
Posts: 15,466
Likes: 0
From: GARDENA Ca, State Of Konfusion
St. Jude Donor '05
Re: Dyno Results at MTI (Don&Kelly)
Sorry I don't buy into these formulas. I had 353 rwhp and changed my gear (3.42) to 3.73 and changed the T/C (PT-2400) to a ST-3500 , my next dyno I had 341 rwhp. Does that mean I lost hp at the flywheel, I don't think so!
The car didn't get slower at the track, it got faster! :yesnod:
[Modified by wallstAL, 6:06 PM 1/4/2003]
The car didn't get slower at the track, it got faster! :yesnod:
[Modified by wallstAL, 6:06 PM 1/4/2003]
Team Owner
Joined: Jun 2001
Posts: 26,714
Likes: 344
From: Houston, TX
Re: Dyno Results at MTI (Am I Badd)
Make sure those are the corrected numbers. Uncorrected was significantly higher today. Either way that is some seriously strong torque. Not surprised though based on your last outing at Baytown. :cheers:
BTW, Mac, didn't get you voice mail till this evening. If you need me, try me again Sunday - I turn my cell phone off at night.
BTW, Mac, didn't get you voice mail till this evening. If you need me, try me again Sunday - I turn my cell phone off at night.
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Team Owner
Joined: Jun 2001
Posts: 26,714
Likes: 344
From: Houston, TX
Re: Dyno Results at MTI (wallstAL)
Sorry I don't buy into these formulas. I had 353 rwhp and changed my gear (3.42) to 3.73 and changed the T/C (PT-2400) to a ST-3500 , my next dyno I had 341 rwhp. Does that mean I lost hp at the flywheel, I don't think so!
The car didn't get slower at the track, it got faster! :yesnod:
[Modified by wallstAL, 6:06 PM 1/4/2003]
The car didn't get slower at the track, it got faster! :yesnod:
[Modified by wallstAL, 6:06 PM 1/4/2003]
Safety Car
Joined: Oct 2001
Posts: 3,504
Likes: 25
From: Insert Wittty Comment here
Re: Dyno Results at MTI (wallstAL)
Lowering your gear ratio will result in a lower HP number measured at the rear wheels. This is an accepted fact when measuring force at the rear wheels. Its just like dynoing your car in overdrive. You will get a bigger HP reading. And if you dyno in 2nd it will read lower. Your car didn't loose HP.
Also, look at your TQ figures.
Same thing apples if you went from a 4.10 to a 2.73. You'd see about a 20-40HP gain with no other changes.
Rember your gear is multiplying torque. HP is a measure of acceleration. Lowering your gear ratio means it takes longer to accelerate your rear wheels. Its easier for your motor to perform this work under a load. But this is a no-load situation. So you see it as less power.
Also, look at your TQ figures.
Same thing apples if you went from a 4.10 to a 2.73. You'd see about a 20-40HP gain with no other changes.
Rember your gear is multiplying torque. HP is a measure of acceleration. Lowering your gear ratio means it takes longer to accelerate your rear wheels. Its easier for your motor to perform this work under a load. But this is a no-load situation. So you see it as less power.
Melting Slicks
Joined: Jun 2000
Posts: 2,386
Likes: 4
From: Dallas / Fort Worth, Texas Texas
Re: Dyno Results at MTI (J-Rod)
:iagree: with J-Rod
My tuner said that every vette that he put 3:42's or 3:73's, or whatever, always dropped in RWHP, but got faster at the track .. I believe this has been debated before on the forum & they finally agreed that going from a 3:42 to a 3:73 would lower your RWHP - sometimes by quite a bit ...
My tuner said that every vette that he put 3:42's or 3:73's, or whatever, always dropped in RWHP, but got faster at the track .. I believe this has been debated before on the forum & they finally agreed that going from a 3:42 to a 3:73 would lower your RWHP - sometimes by quite a bit ...
Race Director
Joined: Aug 1999
Posts: 15,466
Likes: 0
From: GARDENA Ca, State Of Konfusion
St. Jude Donor '05
Re: Dyno Results at MTI (Don&Kelly)
So, flywheel (Crank) hp can not be determined by a generic formula and adding 20% to rear wheel horsepower for the A4 and 15% for the M6!!!!! Seems to me, there are many more factors involved in determining Flywheel hp. :yesnod: :yesnod:
Hope you guys get, what I am attemping to put into prospective.
If you add cold air with an intake (such as a Vortex), I would think the flywheel hp would increase and also rear wheel hp. But if you change to a taller gear, the rwhp should read less and the flywheel hp should remain the same.
[Modified by wallstAL, 1:25 AM 1/5/2003]
Hope you guys get, what I am attemping to put into prospective.
If you add cold air with an intake (such as a Vortex), I would think the flywheel hp would increase and also rear wheel hp. But if you change to a taller gear, the rwhp should read less and the flywheel hp should remain the same.
[Modified by wallstAL, 1:25 AM 1/5/2003]
Race Director
Joined: Jan 2000
Posts: 12,407
Likes: 0
From: My barber didn't know when to quit... Do you?
Re: Dyno Results at MTI (jschindler)
Yeah theat TQ is unreal.
That is more than alot of people with all the boltons and heads/cam!!!!
Are you sure it wasn't a spike in the graph or something?
Congrats!!!!
That is more than alot of people with all the boltons and heads/cam!!!!
Are you sure it wasn't a spike in the graph or something?
Congrats!!!!
Melting Slicks
Joined: Oct 2002
Posts: 2,855
Likes: 0
Re: Dyno Results at MTI (wallstAL)
The 3.73 changed your final drive ratio and doesn't give the same numbers as it did with the stock rearend, I changed to 390s on my M6 and it cost me about 5% on the dyno but is much quicker.
Race Director
Joined: Nov 2001
Posts: 10,143
Likes: 0
From: Retired USCG North Georgia
Re: Dyno Results at MTI (Don&Kelly)
:iagree: with J-Rod
My tuner said that every vette that he put 3:42's or 3:73's, or whatever, always dropped in RWHP, but got faster at the track .. I believe this has been debated before on the forum & they finally agreed that going from a 3:42 to a 3:73 would lower your RWHP - sometimes by quite a bit ...
My tuner said that every vette that he put 3:42's or 3:73's, or whatever, always dropped in RWHP, but got faster at the track .. I believe this has been debated before on the forum & they finally agreed that going from a 3:42 to a 3:73 would lower your RWHP - sometimes by quite a bit ...
