A Good Combination!

[Roger Ramjet]

I did a 3.89 gear change, an aluminum flywheel, and a SCT tune all at the same time on my '05 GT 5 speed. I also raised the idle RPM to 1000 to quicken the engine accel at the touch of the throttle. The engine does accel/decel much quicker. And, the RPM falls quicker between shifts - no more RPM hangup going up to the next gear.

I am VERY satisfied with the performance improvement but the factory tires are hating it - tire spin on demand in the first 2 gears.

 

[SpartaPerformance]

Taller gears means mor torque multiplication. A rear suspension and a pinion angle adjustment would be a good idea and should get some sticky tires.

 

[fobra559]

A new Driveshaft too maybe. The ones for the S197's are pricey though

 

[anticubicle]

Grats! Your sig is very vague on your mods but I'll say before you even bother with a driveshaft or any other stuff go for Lower Control Arms and Adjustable Upper Control Arm!!

 

[fobra559]

Grats! Your sig is very vague on your mods but I'll say before you even bother with a driveshaft or any other stuff go for Lower Control Arms and Adjustable Upper Control Arm!!

Yeah, LCA's and UCA's sound good to me. Sucks that the DS's are expensive though

 

[Roger Ramjet]

This is my street car - not a race car. Don't think I'll be doing anything else except tires.

 

[Roger Ramjet]

Got a 900 HP street legal GMC S-15 Blazer for a race car.

 

[fobra559]

This is my street car - not a race car. Don't think I'll be doing anything else except tires.

Whoops, sounded like the way you were going with the combo it was going to be a race car How about a simple CAI or an exhaust before you call it quits after the new tires?

 

[fobra559]

Got a 900 HP street legal GMC S-15 Blazer for a race car.

 

[Roger Ramjet]

The steroids that my Mustang got started when the local Ford dealer sent me an invitation to check out their new Roush Mustangs. My '05 was stock except for the Steeda exhaust that it got a week after I took delivery in late 2004.

I drove the Roush about 25 miles then disappointed the salesman when I told him I wasn't interested in the car because the car did not impress me. I told him that I could make a regular Mustang GT run that good for the street with a gear change, an aluminium flywheel, and a set of performance mufflers. Then I had to prove it to myself while I saved 20 few thousand dollars the deal would have cost me.

 

[kooldawg6]

This is my street car - not a race car. Don't think I'll be doing anything else except tires.

The driveshaft will drop a bunch more rotational mass and your RPMs will climb faster yet

 

[Roger Ramjet]

An aluminum flywheel is a lot better way to reduce rotating mass than the aluminum driveshaft - and it will last longer.

 

[Towelly]

An aluminum flywheel is a lot better way to reduce rotating mass than the aluminum driveshaft - and it will last longer.

What? ... This statement confuses me... I understand that the flywheel is a better way to reduce rotating mass and why. But lasts longer? Last time I checked you have to machine that flywheel with a new clutch install, once you have a driveshaft installed you don't have to do anything to it....

 

[stangdude2000]

Only bad thing about an aluminum driveshaft is that it twists more under load which slows down responsiveness slightly, but its still a vast improvement over stock. How about carbon fiber?

 

[fobra559]

The driveshaft will drop a bunch more rotational mass and your RPMs will climb faster yet

Indeed it does my friend

 

[fobra559]

The steroids that my Mustang got started when the local Ford dealer sent me an invitation to check out their new Roush Mustangs. My '05 was stock except for the Steeda exhaust that it got a week after I took delivery in late 2004.

I drove the Roush about 25 miles then disappointed the salesman when I told him I wasn't interested in the car because the car did not impress me. I told him that I could make a regular Mustang GT run that good for the street with a gear change, an aluminium flywheel, and a set of performance mufflers. Then I had to prove it to myself while I saved 20 few thousand dollars the deal would have cost me.

Just goes to show, the name ROUSH is worth a couple more thousands.

 

[Roger Ramjet]

The Fidenza aluminum flywheel that I bought has a bolted on steel friction plate for clutch contact. It should wear as well as the steel unit at 1/3 the weight.

 

[Roger Ramjet]

There are several reasons, in my mind, to not use a light driveshaft. The light materials fatigue and break more quickly, they are more easily damaged from contact, the riveted connections between the tubes and the steel yolks tend to loosen over time, and they cost a lot more. I'll stick with the steel driveshaft.

 

[ranger04]

Instead of either, or, why not just use them both? An aluminum DS and flywheel should let the motor really sing.

 

[stangdude2000]

There are several reasons, in my mind, to not use a light driveshaft. The light materials fatigue and break more quickly, they are more easily damaged from contact, the riveted connections between the tubes and the steel yolks tend to loosen over time, and they cost a lot more. I'll stick with the steel driveshaft.

Fatigue really isn't an issue in street cars. First, there is no fatigue failure associated with carbon fiber. Second, most of the aftermarket aluminum driveshafts are larger diameter (most I've seen are 3.5 inches instead of 3 for the steel driveshafts), so that helps offset the fatigue issue. At the torque we are running, its not nearly an issue. Even if you were transmitting 400 ft-lbs of torque through the driveshaft, it would take far more than a billion full throttle starts for the driveshaft to fail due to fatigue. I don't know the wall thicknesses of these driveshafts, but the stresses the driveshaft is put under (with 400 ft-lbs of RWTQ) would worst case would be about half of the stress level required for fatigue failure at one billion cycles. Keep in mind, when you do a less than full throttle start (say all half throttle starts), the number of cycles before fatigue failure would SIGNIFICANTLY increase.