Probably a dumb question but if you were to add alightweight driveshaft to an otherwise stock GT how much horsepower might it add.
__________________
2007 GT - Grabber Orange, exterior appearance package, IUP, leather, 5 Spd stick, 3.55s, C and L Street CAI, BamaChips tune, Gen 2 qtr window louvers, Astra Hammond chin spoiler, Mac Pro-Chamber with cats, Saleen Heritage Spoiler, FRPP LCAs,
Probably a dumb question but if you were to add alightweight driveshaft to an otherwise stock GT how much horsepower might it add.
Don't know the answer, but have an idea on how to figure this out. An auto has something like 15 RWHP less than a manual. This is due to rotational mass of auto trans over manual. So how much is the rotational mass difference?
__________________
2006 Redfire GT Vert Auto, every factory option, 490rwhp JDM Saleen SC, One piece driveshaft, Steeda ultralight springs - rear adjustable UCA and LCAs, CHE relo brackets, Granelli front cross-member, Intrax sway bars, Tokico dampers, Hawk brake pads, Shelby Redline wheels and Nitto tires, GT500 exhaust, FRPP 3.73's, Pioneer AVIC-D3 navigation head unit, and Saleen HID headlights. See profile for appearance mods
The weight diff between the stock two piece heffer and the 4" alu piece is 27 lb's. Probably more for the 3.5" unit.
There is no power 'gain' just a reduction in power lost... I have heard upto 15 RWHP.
But even if there is NO powergain the feel is awesome! There is no twisting and delaying, it feels much more like you're controling the rear tires with your right foot, much more direct power transfer, it's all there, INSTANTLY! Of course assuming you have a tune...
__________________
KJ, poorer but happier
Thanks to: Modular Depot Fox Lake Racing Tunable Induction Power House 411 Sun Coast Creations
The weight diff between the stock two piece heffer and the 4" alu piece is 27 lb's. Probably more for the 3.5" unit.
There is no power 'gain' just a reduction in power lost... I have heard upto 15 RWHP.
But even if there is NO powergain the feel is awesome! There is no twisting and delaying, it feels much more like you're controling the rear tires with your right foot, much more direct power transfer, it's all there, INSTANTLY! Of course assuming you have a tune...
Yeah, right, you're just recovering power lost by the drivetrain from the old shaft, but the engine still puts out the same. I can't wait for it! I'm assuming that my fuel mileage will improve slightly due to the lighter rotational weight of the shaft as well as the UDPs that I'm getting installed. I only get 14 to 15 miles per gallon since it's all city driving and I'm in warm up mode most of time since I'm only 5 miles from work.
Plus, I'm idling a lot and I know that the idle circuit on carbs run a richer mixture at idle so I'm sure the computer runs the fuel injectors richer at idle on these engines.
When I weighed the shaft it came in at 16.5 lbs which is the same as the 4" Powerhouse shaft, but that was with my pinion adapter plate bolted on (since DSS shafts are installed backwards) and I think the Powerhouse 4" shafts are weighed without that plate. Sooo, the 3.5" shaft should weigh about a half to a full pound less that the 4" shaft depending on how much that adapter plate weighs. I think I'm going to pull that plate today and then see what the shaft weighs for sure.
This snow better clear up by Sat or the ride to MD will be hairy!
__________________
06 Stang GT, Yeah I got stuff! Check out my profile for the low down.
Yeah, right, you're just recovering power lost by the drivetrain from the old shaft, but the engine still puts out the same. I can't wait for it! I'm assuming that my fuel mileage will improve slightly due to the lighter rotational weight of the shaft as well as the UDPs that I'm getting installed. I only get 14 to 15 miles per gallon since it's all city driving and I'm in warm up mode most of time since I'm only 5 miles from work.
Plus, I'm idling a lot and I know that the idle circuit on carbs run a richer mixture at idle so I'm sure the computer runs the fuel injectors richer at idle on these engines.
When I weighed the shaft it came in at 16.5 lbs which is the same as the 4" Powerhouse shaft, but that was with my pinion adapter plate bolted on (since DSS shafts are installed backwards) and I think the Powerhouse 4" shafts are weighed without that plate. Sooo, the 3.5" shaft should weigh about a half to a full pound less that the 4" shaft depending on how much that adapter plate weighs. I think I'm going to pull that plate today and then see what the shaft weighs for sure.
This snow better clear up by Sat or the ride to MD will be hairy!
I noticed no improvement in gas mileage after the d/s install. Though I did notice a distinct decline in drivetrain clunkiness.
To answer your question. The drive shaft has not been shown to improve dyno HP or TQ. When we did our testing it didn't show improvements in acceleration either. What it did do was reduce weight by 21 lbs and decrease the sloppiness of the driveline. KJ is right you definetly feel more connected to the rear wheels. If you are planning on doing any type of Drag racing or power adders I would suggest replacing the DS. The factory drive shaft has been known to fail even at low power levels.
Snow is gone... at least off the roads... dang did I have a bad ride home from work yesterday... well my 170K miles F150 4x4 Off-Road had no problems but all these other morans!! Even saw two S197 a GT and a sixer... blew by them both, my F150 tank is faster than I thought!!
Ben, so you guys found no gain on the dyno with proper testing? That's weird, I mean the gain should be up there with the LW FW...??
For you that don't know Ben is with the Grassroot mag...
__________________
KJ, poorer but happier
Thanks to: Modular Depot Fox Lake Racing Tunable Induction Power House 411 Sun Coast Creations
To answer your question. The drive shaft has not been shown to improve dyno HP or TQ. When we did our testing it didn't show improvements in acceleration either. What it did do was reduce weight by 21 lbs and decrease the sloppiness of the driveline. KJ is right you definetly feel more connected to the rear wheels. If you are planning on doing any type of Drag racing or power adders I would suggest replacing the DS. The factory drive shaft has been known to fail even at low power levels.
Hope this helps.
Hmmm, then why do autos dyno less HP than manuals? Thought it was due to more drivetrain rotational weight...
__________________
2006 Redfire GT Vert Auto, every factory option, 490rwhp JDM Saleen SC, One piece driveshaft, Steeda ultralight springs - rear adjustable UCA and LCAs, CHE relo brackets, Granelli front cross-member, Intrax sway bars, Tokico dampers, Hawk brake pads, Shelby Redline wheels and Nitto tires, GT500 exhaust, FRPP 3.73's, Pioneer AVIC-D3 navigation head unit, and Saleen HID headlights. See profile for appearance mods
Sorry to hear about the snow. I do not miss the snow at all. I heard from some family that the "white death" had gripped the Cincinnati area. Traveling was a real nightmare.
As for the drive shaft. I don't want to give away too much because we will have a pretty extensive online article for everyone to read that compares, heavy wheels to light wheels, factory drive shaft to 3.5 inch aluminum, and factory clutch and flywheel to aftermarket aluminum flywheel and clutch.
Rather than doing any dyno testing we used a Vericom and did accelration testing. For those who don't know the Vericom is an extremly accurate testing device for vehicle performance. Basically second gear acceleration, no wheel spin 15mph to 60mph. We did three runs and took the average. The driveshaft showed no improvement in acceleration. My thoughts are the drive shaft has such a small diameter and is low in the vehicle that the rotational forces are minimal.
As for an automatic, the main culprit in reduced HP figures is the Torque Converter.
I still think the DS is a GOOD MOD. You really have to feel it to believe it. The factory mustang has a lot of drive line play.
Well I got my car back today from getting a the new driveshaft, UDPs and LCAs and it seemed to pull a little harder. I heard a pop on the left side when I turned right out of Modular Depot and got on it and Ithought it was the LCA, but all it turned out to be was the stock driveshaft sliding around in the trunk...I told them to throw it away, but they gave it to me anyway.
I got a good look at that old driveshaft when I took it out of the trunk and what a piece of junk that part in the middle is...no wonder they break. I did feel more connected to the road probably because my new LCAs have stiffer bushings than stock...I could feel slight vibrations that weren't there before, but I liked it. My gas mileage did go up a little on the way back from the shop, but I had Steeda UDPs installed at the same time. I was getting on it a little on the straights and my mileage still went up a tenth on the way back. When this nasty weather clears, I'll wring her out a little to see how every thing shakes out for real. I've got to go back to MD in a couple of days when the paint on my new chin spoiler cures. The next mod looks like Long Tubes. Check em out here: http://www.americanracingheaders.com/
__________________
06 Stang GT, Yeah I got stuff! Check out my profile for the low down.
Well I got my car back today from getting a the new driveshaft, UDPs and LCAs and it seemed to pull a little harder. I heard a pop on the left side when I turned right out of Modular Depot and got on it and Ithought it was the LCA, but all it turned out to be was the stock driveshaft sliding around in the trunk...I told them to throw it away, but they gave it to me anyway.
I got a good look at that old driveshaft when I took it out of the trunk and what a piece of junk that part in the middle is...no wonder they break. I did feel more connected to the road probably because my new LCAs have stiffer bushings than stock...I could feel slight vibrations that weren't there before, but I liked it. My gas mileage did go up a little on the way back from the shop, but I had Steeda UDPs installed at the same time. I was getting on it a little on the straights and my mileage still went up a tenth on the way back. When this nasty weather clears, I'll wring her out a little to see how every thing shakes out for real. I've got to go back to MD in a couple of days when the paint on my new chin spoiler cures. The next mod looks like Long Tubes. Check em out here: http://www.americanracingheaders.com/
Congrats on the new toys... Sounds like all went well.
I have heard upto 15 RWHP.
