1990 DSM Turbo Talon vs. h/c C5
11-04-2010, 03:16 PM
#1
1990 DSM Turbo Talon vs. h/c C5 I ran a guy I know who wanted to gauge where his car is power wise. Its a 90 Turbo Eagle Talon on 21psi of boost. As far as I know it has a built motor but runs on pump gas and has a stock drivetrain. He wanted to go from a 40mph. First race I gave him 2 cars on the flyby (me at 40mph) and on the second run I gave him 1 car on a flyby.
1st run
http://www.youtube.com/watch?v=cfebF-eYK4w
2nd run
http://www.youtube.com/watch?v=0JAe_DCX2Uo
1st run
http://www.youtube.com/watch?v=cfebF-eYK4w
2nd run
http://www.youtube.com/watch?v=0JAe_DCX2Uo
11-04-2010, 06:13 PM
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What turbo was he using? 21psi describes nothing really if you don't know which turbo is installed.
Seems like a strange way to measure his power if all he wants to do are flybys. No dig runs?
Seems like a strange way to measure his power if all he wants to do are flybys. No dig runs?
11-04-2010, 06:15 PM
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11-04-2010, 07:23 PM
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11-04-2010, 08:52 PM
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Not sure what turbo he is running. Its aftermarket but not very big. He wont push it passed 22lbs. He bought the car with the parts it has now. it was just apart and he has put it together. I first thought I better get my slicks to go from a dig, awd right? He said he didnt want to break something in the stock drivetrain. Thing is he wants to race his friend that thas a 997 TT Porsche with 700whp and wanted to see where he would be. I think Im gonna hit up the Porsche now.
11-04-2010, 10:29 PM
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Not sure what turbo he is running. Its aftermarket but not very big. He wont push it passed 22lbs. He bought the car with the parts it has now. it was just apart and he has put it together. I first thought I better get my slicks to go from a dig, awd right? He said he didnt want to break something in the stock drivetrain. Thing is he wants to race his friend that thas a 997 TT Porsche with 700whp and wanted to see where he would be. I think Im gonna hit up the Porsche now.
By the looks of that vid, the Porsche is making at least double the whp as the dsm. Way, way out of his league.
He needs to drop a few grand with Forced Performance before trying to run with 700whp 911s.
11-04-2010, 10:33 PM
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Its more in depth then just bigger turbo = more flow. IF you ran a small turbo that was efficient at 9psi and a big turbo at 9psi, theyd make pretty close to the same numbers (peak; smaller turbo would obviously spool faster). When you start getting up into the big boost numbers, the smaller turbos create alot of heat when they compress the air and cannot keep up.
11-04-2010, 10:42 PM
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Its more in depth then just bigger turbo = more flow. IF you ran a small turbo that was efficient at 9psi and a big turbo at 9psi, theyd make pretty close to the same numbers (peak; smaller turbo would obviously spool faster). When you start getting up into the big boost numbers, the smaller turbos create alot of heat when they compress the air and cannot keep up.
Decent sized turbos at low boost are the most pointless thing FI guys do. All you do by oversizing a turbo is increase the lag and decrease the torque. My car on 13psi (wastegate spring when i started tuning) only made 240whp, because the turbo doesn't begin to get efficient until 20psi+
11-05-2010, 12:28 AM
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Right, i was keeping it simple.
Decent sized turbos at low boost are the most pointless thing FI guys do. All you do by oversizing a turbo is increase the lag and decrease the torque. My car on 13psi (wastegate spring when i started tuning) only made 240whp, because the turbo doesn't begin to get efficient until 20psi+
Decent sized turbos at low boost are the most pointless thing FI guys do. All you do by oversizing a turbo is increase the lag and decrease the torque. My car on 13psi (wastegate spring when i started tuning) only made 240whp, because the turbo doesn't begin to get efficient until 20psi+
Usually you see the high horsepower pump gas cars using a large turbo at a relatively low boost level (compared to race gas). For example, an AMS built EVO used a 950R turbo kit which is rated over 900hp on race gas to make mid 600s on pump.
11-05-2010, 07:26 AM
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That's not strictly true. While it is true you will generally make less peak torque with a large turbo vs a smaller turbo at the same power level, guys who don't want to build their engines or run race gas use a larger turbo at lower boost pressures to keep cylinder pressures down.
Usually you see the high horsepower pump gas cars using a large turbo at a relatively low boost level (compared to race gas). For example, an AMS built EVO used a 950R turbo kit which is rated over 900hp on race gas to make mid 600s on pump.
Usually you see the high horsepower pump gas cars using a large turbo at a relatively low boost level (compared to race gas). For example, an AMS built EVO used a 950R turbo kit which is rated over 900hp on race gas to make mid 600s on pump.
Its not oversizing the turbo if you're going to run it to capacity on race fuel, or going for max power on pump. My point is the (often honda) guys who run 18psi from a 35R on a 2.0L engine. If you've got a 35psi race gas map for the track, than thats a great turbo, but if it's a street car at 18psi all the time it's pointless. Run a 30R on 21-23 psi, and make the same peak power with a much better curve.
