A HP question? NA vs FI?
Thread Starter
Joined: Mar 2004
Posts: 1,752
Likes: 27
From: Ontario, Canada
A HP question? NA vs FI? I figure that the hardcore racers will be the mostly likely place to get a straight answer.
I have a buddy who has a fast newer Charger. It has a 423ci Hemi (they all call them 426s? WTF), with a 1.9L blower. It has made 605rwhp with a near flat torque curve over 600ft.tq from 3000rpm on up one dynojet. He added meth and it made torque even lower and went up to 620rwhp on another dynojet. The car has gone 10.5@134.5 with a rough race weight of 4400-4500lbs. He is now trying to say because an online calculator shows 770rwhp for that mph, that this is what it is making. I know both of the dynos, and while they are not happy, they are not off by 150 rwhp.
As I see it, these calculators must be more oriented towards NA power which have a lot less power under the curve. Or are they just full of crap, period.
The calculator he is using showed my old 412 making 585rwhp when it never dyno'd better than 512 as it was set up when it ran 129mph.
He has had several 131-133 passes, this was the first 134.
I have looked for FI calculators, but there has to be a difference.
Thoughts?
I have a buddy who has a fast newer Charger. It has a 423ci Hemi (they all call them 426s? WTF), with a 1.9L blower. It has made 605rwhp with a near flat torque curve over 600ft.tq from 3000rpm on up one dynojet. He added meth and it made torque even lower and went up to 620rwhp on another dynojet. The car has gone 10.5@134.5 with a rough race weight of 4400-4500lbs. He is now trying to say because an online calculator shows 770rwhp for that mph, that this is what it is making. I know both of the dynos, and while they are not happy, they are not off by 150 rwhp.
As I see it, these calculators must be more oriented towards NA power which have a lot less power under the curve. Or are they just full of crap, period.
The calculator he is using showed my old 412 making 585rwhp when it never dyno'd better than 512 as it was set up when it ran 129mph.
He has had several 131-133 passes, this was the first 134.
I have looked for FI calculators, but there has to be a difference.
Thoughts?
Last edited by RAMPANT; Nov 12, 2012 at 09:16 PM.
Thread Starter
Joined: Mar 2004
Posts: 1,752
Likes: 27
From: Ontario, Canada
There are several that show both, but this is the one we were discussing.
http://vexer.com/automotive-tools/1-...MPH-calculator
http://vexer.com/automotive-tools/1-...MPH-calculator
So you already know what its making at the wheels via dyno and what it runs at the track. Why are you even talking about some bullshit calculator? Don't you already have all the information you need?
Unless hes just trying to boost his ego that conversation is totally worthless.
Unless hes just trying to boost his ego that conversation is totally worthless.
10 Second Club
Joined: Oct 2007
Posts: 2,630
Likes: 28
So you already know what its making at the wheels via dyno and what it runs at the track. Why are you even talking about some bullshit calculator? Don't you already have all the information you need?
Unless hes just trying to boost his ego that conversation is totally worthless.
Unless hes just trying to boost his ego that conversation is totally worthless.
Just out of curiosity what wheels does he run on the track passes?
Thread Starter
Joined: Mar 2004
Posts: 1,752
Likes: 27
From: Ontario, Canada
I was just curious if anyone has seen a calculator specifically for forced induction drivetrains, and see if I could bring a little common sense to the discussion.
As mentioned the same calculator inflated my numbers by 75rwhp vs reality of what it dyno'd.
Thread Starter
Joined: Mar 2004
Posts: 1,752
Likes: 27
From: Ontario, Canada
Pretty sure the weight can not be too far off. My DD is and SRT8 Magnum and it does weigh in over 4200lbs, and he is a big guy.
Rims I am not 100% on. I know he has some light Forgestars, but I think they are his street set up. Pretty sure on the strip he is using Hoosier DRs.
We have just been debating and thought I would check in with the hardcore guys.
He has owned and driven a 7sec Firebird that trapped over 190mph, so it does seem funny he is trying to inflate the numbers, but he is. Either way it is a really fast 4 door street car.
Rims I am not 100% on. I know he has some light Forgestars, but I think they are his street set up. Pretty sure on the strip he is using Hoosier DRs.
We have just been debating and thought I would check in with the hardcore guys.
He has owned and driven a 7sec Firebird that trapped over 190mph, so it does seem funny he is trying to inflate the numbers, but he is. Either way it is a really fast 4 door street car.
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10 Second Club
Joined: Oct 2007
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Mmmm, yes, we agree. I am trying to be nice, but also I would think a FI 620rwhp set up would easily out perform a 620 rwhp NA set up in the same car. Just due to the sheer under the curve power. If he uses the ET version it gets closer, but still I would guess inflated by 80rwhp.
I was just curious if anyone has seen a calculator specifically for forced induction drivetrains, and see if I could bring a little common sense to the discussion.
As mentioned the same calculator inflated my numbers by 75rwhp vs reality of what it dyno'd.
I was just curious if anyone has seen a calculator specifically for forced induction drivetrains, and see if I could bring a little common sense to the discussion.
As mentioned the same calculator inflated my numbers by 75rwhp vs reality of what it dyno'd.
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