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07-12-2000, 08:22 PM | #1 |
Scooby Specialist
Member#: 12
Join Date: Jun 1999
Chapter/Region:
MWSOC
Location: Appleton, WI
Vehicle:2018 STI Type RA Crystal Black Silica |
Possible to do sub 7.0 0-60 runs w/o turbo, supercharger, or nitrous?
I have a 98 RS with a JC intake, underdrive pulley, and a free flowing muffler. I am guessing my hp is around 190. Most 0-60 runs are in the low 7's with a few 6.9's and one 6.8. I was wondering if anyone was running faster with similar mods. I cannot afford a turbo or supercharger and don't want to blow up my engine with NOS, but I would like to make my Impreza faster. Any suggestions?
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07-12-2000, 08:32 PM | #2 |
Scooby Specialist
Member#: 1346
Join Date: Apr 2000
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Have you looked at Rallispec's cams yet? I hear they're still being designed, the DOHC ones that is, and it's substantially less than a turbo setup.
Check out www.rallispec.com and mail em for details. |
07-13-2000, 09:36 AM | #3 |
Scooby Specialist
Member#: 216
Join Date: Aug 1999
Location: san diego, ca USA
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Since it sounds like you've only replaced the muffler, you could replace the exhaust piping from the headers back. Take it to a muffler shop, have them fabricate everything with 2.25" piping, throw in a 2.25" cat and weld it up to the muffler you already have. Should cost around $300, and it will probably net you about 10 more horsepower.
If you want a turbo, but don't have the funds, I'd just save up until April of next year. As soon as the WRX hits I'm sure there will be a plethora of used turbo kits available with not many miles on them. |
07-13-2000, 10:46 AM | #4 |
Techno Sapien
Moderator Member#: 449
Join Date: Oct 1999
Chapter/Region:
MWSOC
Location: Lawrence, KS
Vehicle:2019 Impreza Sport Lithium Red |
I'm getting the same numbers as you with my mods. 6.8, 6.9 w/ a g-tec. I think I could do better with more practice but not much better
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07-13-2000, 11:14 AM | #5 |
Scooby Specialist
Member#: 102
Join Date: Jul 1999
Location: The meeting place
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My folks's 91 miata ran low sevens with a gtech! The miata for that year was rated with 115hp and errr... almost no TQ and a 0-60 of 9 ticks. So I won't trust gtech that much anymore.
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07-13-2000, 03:25 PM | #6 |
Scooby Specialist
Member#: 12
Join Date: Jun 1999
Chapter/Region:
MWSOC
Location: Appleton, WI
Vehicle:2018 STI Type RA Crystal Black Silica |
Tim, I thought replacing the exhaust from the cat back would be a good idea also, that is, until I did some research. There was a SCC mag a few months ago that tested many aftermarket items for the 2.5RS on a four wheel dyno and all of the enlarged catback exhausts actually lost horsepower due to the decrease in needed backpressure for the engine. Apparently a larger pipe will only help when you have more power, like with a turbo.
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07-13-2000, 04:02 PM | #7 |
Scooby Specialist
Member#: 216
Join Date: Aug 1999
Location: san diego, ca USA
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That's why I said 2.25" piping. SCC found losses when going to 2.5" piping. Larger diameters will decrease the exhaust gas scavenging effect. Basically scavenging is when the gases pull themselves along in a smooth flow, if the diameter is too large (for the amount of flow) you'll get turbulence in the exhaust stream. Replacing the intermediate pipe (cat back section) will help some, but if you want best results replace the the cats as well with a high flow 2.25" cat. Have the muffler shop straighten out some of those bends too and you'll be in business.
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07-14-2000, 12:17 AM | #8 |
Scooby Specialist
Member#: 626
Join Date: Dec 1999
Location: Miami FL
Vehicle:2001 Impreza 2.5 RS Black Diamond Pearl |
Nah Gambit I dont think the GTECH is that bad. Garbage in garbage out.
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07-14-2000, 12:40 AM | #9 |
Scooby Guru
Member#: 518
Join Date: Nov 1999
Chapter/Region:
NESIC
Location: Pelham, NH USA
Vehicle:762 PGT Impreza L, Elantra GT Sport |
Well, remember that the GTech is very accurate...relative to itself. If you put it up against real timers, it will be off. But it'll be dead on if you use it to compare modifications on the same car using the same GTech.
Trunk Monkey is Coming! Sean Sosik-Hamor < [email protected] > Sosik-Hamor Networks Project Subaru Epinions Automotive Reviews by `Sean Dmoz Subaru Index by `Sean [This message has been edited by Sean (edited July 13, 2000).] |
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