Rotrex Supercharger thread
09-27-2012, 03:27 PM
#106
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While I see your point here, why not take it to the dragstrip? That is a pretty good indicator of "real-world" power IMO. I'm just like you though, I really couldn't care less about a big power number, just so long as the car works in the real world. So, whatever numbers I get whenever I get around to supercharging my car will just be numbers, and when I take it to the track it'll be the real test. Still not gonna be as quick as my pickup though!
09-27-2012, 03:51 PM
#107
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I likely will never dyno because I am worried about modern steet drivabilty over peak rpm range HP. I think most good cars can handle another 100 or maybe even 150 Hp OK. It is pretty clear to anyone that if you get beyond that you need to start moddifing to no end or risk damaging your car. The low boost works great for me and I would never own another 928 without it. I don't need to be the fastest car around, but with all the big engines being made again I do want to know that I can keep up with the pickup next to me.
09-27-2012, 04:27 PM
#109
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I likely will never dyno because I am worried about modern steet drivabilty over peak rpm range HP. I think most good cars can handle another 100 or maybe even 150 Hp OK. It is pretty clear to anyone that if you get beyond that you need to start moddifing to no end or risk damaging your car. The low boost works great for me and I would never own another 928 without it. I don't need to be the fastest car around, but with all the big engines being made again I do want to know that I can keep up with the pickup next to me.
09-27-2012, 04:34 PM
#110
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I likely will never dyno because I am worried about modern steet drivabilty over peak rpm range HP. I think most good cars can handle another 100 or maybe even 150 Hp OK. It is pretty clear to anyone that if you get beyond that you need to start moddifing to no end or risk damaging your car. The low boost works great for me and I would never own another 928 without it. I don't need to be the fastest car around, but with all the big engines being made again I do want to know that I can keep up with the pickup next to me.
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Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
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Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
09-27-2012, 04:43 PM
#111
lol. Seriously though, If I was going to put a guesstimate on it I would say the sharktuning and boost gave the car about 35% more power. So if I started with say 325 rwhp considering the exhaust mods and weighing the factor that it is an old engine. Without being exact I think I might be anywhere from 410 to 440 rwhp which is pretty nice to get from point A to point B. I think it is great simple bolt on street performance for under $5K.
09-27-2012, 04:52 PM
#112
Seriously though, If I was going to put a guesstimate on it I would say the sharktuning and boost gave the car about 35% more power. So if I started with say 325 rwhp considering the exhaust mods and weighing the factor that it is an old engine. Without being exact I think I might be anywhere from 410 to 440 rwhp which is pretty nice to get from point A to point B. I think it is great simple bolt on street performance for under $5K.
09-27-2012, 05:00 PM
#114
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Much of the grin factor is probably the higher low RPM torque much like a big block old muscle car where you could smoke the tires ( the narrow low traction of the period) pretty much any where in the lower gears no need to use RPM and downshifting. Same with having 4:30 rear gears in the 428 super cobrajet the pull in first gear while brief was awesome !
09-27-2012, 05:06 PM
#115
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Much of the grin factor is probably the higher low RPM torque much like a big block old muscle car where you could smoke the tires ( the narrow low traction of the period) pretty much any where in the lower gears no need to use RPM and downshifting. Same with having 4:30 rear gears in the 428 super cobrajet the pull in first gear while brief was awesome !
Im not noticing a HUGE gain in low RPM "go" power, but over 4k, its an entirely different car.
There IS more..my up the mountain drive 2x a day, no longer feels as labored in 4th gear, and certainly a lot more energetic in 3rd...but its the upper half of the range that rains down sunshine now.
Easily 640 Canadian Horsepower.
09-27-2012, 06:25 PM
#117
Probably the assumption that when a lady in a mini van floors it, I can touch the accelator slightly, have the tach travel from 2200 rpm all the way up to a whopping 3400 rpms, and still stay with traffic. If I floor it to get a thrill it is sparingly and well away from traffic.
Last edited by rgs944; 09-27-2012 at 06:57 PM.
09-27-2012, 06:37 PM
#118
A lot of people have documented with exhaust mods and a few other small mods to get about a 35hp increase. So if my car started with 280 when I got it with only 109,000 on it. Then I did a lot of refreshing to maybe bring it back to 290 or 300. Add in the mods which might add as much as 35HP. I think 325rwhp is a very reasonable estimation on what I started with. Maybe its wrong but I don't think it's being completely unrealistic. Unless Porsche's factory #'s are off that much.
09-27-2012, 06:41 PM
#120
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