Larger Rims and Dyno
07-18-2003, 09:06 PM
#2
17" isn't too bad since stock is usually 15"-17". Actually the tires are the most important weight since they're the farthest from the hub. In acceleration each lb of additional wheel/tire weight usually equals 8lbs static weight.
Figure out your weight and compare vs stock to begin.
Figure out your weight and compare vs stock to begin.
07-24-2003, 07:47 AM
#3
Dyno plot says I have the most area under the Administrator curve
Join Date: Jul 2001
Posts: 7,060
Larger/heavier rims are definitely going to hurt you, although it might not necessarily show up on the dyno. Some have dynoed claiming adding big rims made no difference. Others have dynoed claiming they lost a bunch of power. The added mass and resulting inertial resistance to acceleration of the big rims will most definitely hurt your acceleration, though.
08-03-2003, 02:09 AM
#4
I wonder if this is partially responsible for a 20hp/20tq decrease since my last dyno. I've added the full 2.5" exhaust, CAI, and tuned it, however I've gone from 15 inch winter steelies back to my 17x8 CSA's+245/45ZR17 S-03's... up until now, I was thinking of it as a dyno thing.
Originally posted by SteVTEC
Larger/heavier rims are definitely going to hurt you, although it might not necessarily show up on the dyno. Some have dynoed claiming adding big rims made no difference. Others have dynoed claiming they lost a bunch of power. The added mass and resulting inertial resistance to acceleration of the big rims will most definitely hurt your acceleration, though.
Larger/heavier rims are definitely going to hurt you, although it might not necessarily show up on the dyno. Some have dynoed claiming adding big rims made no difference. Others have dynoed claiming they lost a bunch of power. The added mass and resulting inertial resistance to acceleration of the big rims will most definitely hurt your acceleration, though.
08-06-2003, 03:08 AM
#5
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Join Date: Dec 2002
Location: Toronto
Posts: 103
Originally posted by Jer
I wonder if this is partially responsible for a 20hp/20tq decrease since my last dyno. I've added the full 2.5" exhaust, CAI, and tuned it, however I've gone from 15 inch winter steelies back to my 17x8 CSA's+245/45ZR17 S-03's... up until now, I was thinking of it as a dyno thing.
I wonder if this is partially responsible for a 20hp/20tq decrease since my last dyno. I've added the full 2.5" exhaust, CAI, and tuned it, however I've gone from 15 inch winter steelies back to my 17x8 CSA's+245/45ZR17 S-03's... up until now, I was thinking of it as a dyno thing.
Time to dyno with the 15" steelies but I just got the g-tech pro so I'm going to mess around with that and see if it gives me numbers that make me happy
08-13-2003, 02:24 PM
#6
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Posts: n/a
Originally posted by Zordburg
Yeah,That may be why I'm missing around 20hp as well Time to dyno with the 15" steelies but I just got the g-tech pro so I'm going to mess around with that and see if it gives me numbers that make me happy
Yeah,That may be why I'm missing around 20hp as well
Time to dyno with the 15" steelies but I just got the g-tech pro so I'm going to mess around with that and see if it gives me numbers that make me happy
08-13-2003, 06:46 PM
#9
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Join Date: Dec 2002
Location: Toronto
Posts: 103
Originally posted by 3.0HO
Those numbers are not low. They are right on based on your mods.
Will PM u now.
Those numbers are not low. They are right on based on your mods.
Will PM u now.
Compare with a33. I don't seem to be getting any gain from those 2 mods on the dyno but I can definitely feel a difference from the lightened flywheel and I've seen better dyno numbers.
No worries though if the numbers don't get better I may be going forced air
08-13-2003, 06:50 PM
#10
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Posts: n/a
Originally posted by Zordburg
They are right if you don't have a UDP or a lightened flywheel.
Compare with a33. I don't seem to be getting any gain from those 2 mods on the dyno but I can definitely feel a difference from the lightened flywheel and I've seen better dyno numbers.
No worries though if the numbers don't get better I may be going forced air
They are right if you don't have a UDP or a lightened flywheel.
Compare with a33. I don't seem to be getting any gain from those 2 mods on the dyno but I can definitely feel a difference from the lightened flywheel and I've seen better dyno numbers.
No worries though if the numbers don't get better I may be going forced air
You have pretty much every bolt on mod. You must go to the track a lot? What are your 1/4 times, 60fts and traps? Those are the bottomline numbers you should worry about.
09-08-2003, 09:56 AM
#11
Items that reduce rotational inertia will have the greatest effect when the rotational acceleration is the highest. That would normally be 1st gear and the noticeable gain decreases the slower the rotational acceleration. On a dyno in 3rd or 4th gear the effect is fairly low and may not show up much. In reality through 1st and 2nd there is probably a gain, but due to the way dyno testing is done, it can’t be measured easily.
09-22-2003, 11:16 AM
#12
Originally Posted by MAXimumHP
Items that reduce rotational inertia will have the greatest effect when the rotational acceleration is the highest. That would normally be 1st gear and the noticeable gain decreases the slower the rotational acceleration. On a dyno in 3rd or 4th gear the effect is fairly low and may not show up much. In reality through 1st and 2nd there is probably a gain, but due to the way dyno testing is done, it can’t be measured easily.
What maximumhp says is correct. You won't see the effect of a lightened flywheel on a dyno.
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