DYNO: Fidanza Lightweight Flywheel

[p5sundevil]

i saw a diagram about this on a site i was gonna buy my clutch/flywheel package from.

basically taking the number of 230lbs of savings in first gear with the 9lb flywheel in second gear it is about 1/4 to 1/3 of that and then in 3rd gear it is 1/4 of 2ng gears number and so forth to fourth gear being almost no gain and 5th none at all.

basically flywheels are for launches and gains in low end especially if you are boosted or heavily modded since most other mods move the power band up in the rpm and gear range and the flywheel helps in the opposite way. low gear.

 

[jred321]

http://rr-racing.com/flywheels.htm
was this the site?

 

[LinuxRacr]

http://rr-racing.com/flywheels.htm
was this the site?

That's where I got mine from. (thumb)

 

[Installshield 2]

the lightwieght flywheel will not make your car faster. it may make it quicker thru the gears but not faster. theres a big difference between the two.

what are you refering to? shifting between the gears will be faster? or for example in first gear you will go from 2,000 rpm to 6,000 rpm faster?

And what do you mean by you will not be faster in either case? If you spend less time shifting, the ETA times will show that, in which engine power is propelled through the wheels longer the faster the neutral point between gear changes...

being a fixed final drive and gear ratio gearbox, as long as tire traction is not compromised, your car will be faster if the the engine can move from 2 grand to redline faster.?..If you can get from 1st gear at idle to 3rd gear redlined faster, in turn your acceleration and thus your car will be faster...where you refering to "faster" as acceleration or as top speed?

I think I really missed your point...and I am not arguing, just asking for clarification...

Also lightweight flywheel equipped vehicles are difficult to launch...one main reason why 60' times suck so bad...The main cure is to rev some 1500rpm higher before the clutch dump than you did with the stock flywheel...A 9lb flywheel revved fast enough will still be able to induce massive wheel spin during a 0mph launch...If you still drop the clutch at 3300rpm or whatever you did normally, most likely the engine will simply bog with little wheel spin and a very poor 60' time...rev it higher and you can get just as good 60' times as before, it is just tricky to find the threshold between a good launch, a bogged luanch, and a crazy silly burnout...

 

[p5sundevil]

yes rr racing was the one i was referring to.

 

[Darin]

fwiw, a dyno difference of 1 or 2 hp = no measured gain. 1 or 2 hp can be found by any weather changes...spark firing hotter or cooler - anything. As I suspected, and my spreadsheets indicate, 3rd and 4th gear show no measured gain...as was mentioned, a before and after in 1st or 2nd should show the largest gains.

(cool)

 

[Installshield 2]

fwiw, a dyno difference of 1 or 2 hp = no measured gain. 1 or 2 hp can be found by any weather changes...spark firing hotter or cooler - anything. As I suspected, and my spreadsheets indicate, 3rd and 4th gear show no measured gain...as was mentioned, a before and after in 1st or 2nd should show the largest gains.

(cool)

We really need to see the dyno sheet...and how was the "peak" gain presented? Some dyno plots convey the peak gain as the highest power and torque achieved from before...Some show the peak gain as the higest actual gain over stock in any rev...

That is difficult to explain... A lot of dynos (refering to a stock dyno, then immediately compared to the plot of the modified car) will show the highest output the engine gained over the stock...For example: say you make 100whp at 6200rpm as the peak gain stock, then bolted on a pair of camshafts and made 112whp at 6500rpm...a gain of 12whp...Now say you use the same stock car with this dyno plot, bolt on only a lightweight flywheel and gain .5whp maximum at 6500rpm or something...This shows little as a maximum gain...but what about the gains achieved at 3200rpm or 2000rpm?...That engine may have made 5-7whp more at 3200rpm than the stock engine, but the graph sloped back down towards the stock engine's at higher rpm (for arguments sake say the stock engine made 70whp and 78lb/ft of torque at 3200rpm...and the flywheel'd engine made 77whp and 82lb/ft of torque at 3200rpm)...in a case like this the engine made significant gains low in the rev band, but came out with only a 1/2whp gain overall (say the stocker made 100whp at 6200rpm and the flywheel'd made 100.5whp at 6200rpm)...That is how it can get confusing...Some plots will undermind the actually graph and depict only the highest whp achieved as the highest gain...the highest gain was actually 7whp, but at that point the engine was only making 77whp, so it is not considered...

 

[Equinox]

well the dyno sheet is in ruins so don't count on me scanning it

 

[Installshield 2]

what mods entailed your 126whp/133lb/ft of torque?? I read through your massive list of mods, and from what I could tell you have a HKS 2.5" cat-back, flywheel, AWR Header, and an intake...No cams?...I read that the AWR Header gave massive gains, even compared to other headers...

 

[Equinox]

what mods entailed your 126whp/133lb/ft of torque?? I read through your massive list of mods, and from what I could tell you have a HKS 2.5" cat-back, flywheel, AWR Header, and an intake...No cams?...I read that the AWR Header gave massive gains, even compared to other headers...

the reason I have a list of my mods is I can't keep track of them, so is there really a question in there you didn't answer? heh

 

[70]

MP3 flywheel? aren't they like 5lbs lighter than P5's and regular pro's?

No...

 

[Darin]

We really need to see the dyno sheet...and how was the "peak" gain presented? Some dyno plots convey the peak gain as the highest power and torque achieved from before...Some show the peak gain as the higest actual gain over stock in any rev...

That is difficult to explain... A lot of dynos (refering to a stock dyno, then immediately compared to the plot of the modified car) will show the highest output the engine gained over the stock...For example: say you make 100whp at 6200rpm as the peak gain stock, then bolted on a pair of camshafts and made 112whp at 6500rpm...a gain of 12whp...Now say you use the same stock car with this dyno plot, bolt on only a lightweight flywheel and gain .5whp maximum at 6500rpm or something...This shows little as a maximum gain...but what about the gains achieved at 3200rpm or 2000rpm?...That engine may have made 5-7whp more at 3200rpm than the stock engine, but the graph sloped back down towards the stock engine's at higher rpm (for arguments sake say the stock engine made 70whp and 78lb/ft of torque at 3200rpm...and the flywheel'd engine made 77whp and 82lb/ft of torque at 3200rpm)...in a case like this the engine made significant gains low in the rev band, but came out with only a 1/2whp gain overall (say the stocker made 100whp at 6200rpm and the flywheel'd made 100.5whp at 6200rpm)...That is how it can get confusing...Some plots will undermind the actually graph and depict only the highest whp achieved as the highest gain...the highest gain was actually 7whp, but at that point the engine was only making 77whp, so it is not considered...

Doens't matter - physics tell us that regardless of what dyno runs on two different days tells us, the 'percieved hp gain' will follow the formula of the MOST gain in 1st gear, reducing gains in subsequant gears.

My 1-2hp = no gain applies throughout the powerband.

I'm well aware of the area 'under the curve' you are explaining. At one point I gained 25hp/25ft-lbs w/ my Probe GT by switching to a test pipe, instead of a cat-converter. 7 peak, but at 2000-3000 rpms, I was up 25.

 

[Installshield 2]

the reason I have a list of my mods is I can't keep track of them, so is there really a question in there you didn't answer? heh

ok, I just wasn't sure if I missed anything...Took a few minutes to watch the whole thing

 

[Installshield 2]

Doens't matter - physics tell us that regardless of what dyno runs on two different days tells us, the 'percieved hp gain' will follow the formula of the MOST gain in 1st gear, reducing gains in subsequant gears.

My 1-2hp = no gain applies throughout the powerband.

I'm well aware of the area 'under the curve' you are explaining. At one point I gained 25hp/25ft-lbs w/ my Probe GT by switching to a test pipe, instead of a cat-converter. 7 peak, but at 2000-3000 rpms, I was up 25.

I am confused on what you mean...why doesn't it matter? a small displacement engine rarely makes maximum output until near redline...and makes maximum torque not too far under 5250rpm....If you gain a lot of torque over stock low in the rev band, but still come out with a maximum number of 1 or 2lb/ft higher, you will definately still feel it...These are the type of gains you generally notice with bolt-ons...Intakes usually have fairly large power and torque spikes but come out with a maximum gain of 3-4whp...but you still notice the extra grunt in the midrange...