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#1
11-30-2004, 10:19 PM
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interesting thread on 3si
I was just skimming 3si and thought this was an interesting thread to read:
http://www.3si.org/forum/showthread....7&page=1&pp=10 It starts discussing 4" exhausts, then other restrictions holding the 3/S platform back, compares ideas that have been used on Supras, single turbo setups, etc. It has some interesting theoretical ideas. It's 7 pages, so it takes some time, but I found had some intersting points to consider.
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96 3000gt vr4 -K&N FIPK -Proboost mbc -Cusco front + rear strut bars -Greddy type-s -ATR downpipe -no cats -15Gs, 3sx aluminum pulley, FMIC, SAFC, walboro pump, EVO 560ccs, and Meth Injection Kit all waiting to go in shortly. Your 1996 Mitsubishi 3000GT VR-4 is the 92nd out of the 315 that were made that year. Only 21 of which are exactly identical. 
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#3
11-30-2004, 10:56 PM
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i work right next a guy who owns an exhaust shop and i was asking him bout 4" exhaust because the biggest he puts on is 3" because he says when you go to big it robs hp is this right or what?
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 89 Toyota Supra Turbo 5-speed 
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#4
11-30-2004, 11:18 PM
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Re: interesting thread on 3si
Quote:
It has a negative effect on NA cars, it is BS in regards to turbo cars. This has been addressed in plenty of threads...if you want more info, do a search for "loss of backpressure" I'm sure you'll find plenty of info regarding the subject. as far as mike's ?, I'm not sure exactly what you are asking.
__________________
96 3000gt vr4 -K&N FIPK -Proboost mbc -Cusco front + rear strut bars -Greddy type-s -ATR downpipe -no cats -15Gs, 3sx aluminum pulley, FMIC, SAFC, walboro pump, EVO 560ccs, and Meth Injection Kit all waiting to go in shortly. Your 1996 Mitsubishi 3000GT VR-4 is the 92nd out of the 315 that were made that year. Only 21 of which are exactly identical.
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#5
11-30-2004, 11:31 PM
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With 4" piping the exhuats gas would lose velocity thus creating more difficulty for the engine to expell exhuast gasses. Also, with such large piping the exhuaust would cool off much more than would occur in smaller diameter tubing. The hotter the exhuast gas, the less dense it is which means that the engine will have less trouble "pushing" it out.
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#6
12-01-2004, 01:34 PM
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Re: Re: interesting thread on 3si
Quote:
__________________
93 3000GT base K&N | long tube headers | 3sx crank pulley| testpipe | Addco front/rear sway bars (3SX) | rear strut bar & front 3-point strut bar (by JonVr4 on 3Si) | solid motor mounts | LSD insert | KYB GR-2 struts | intrax springs | adj. control arms | ss brake lines | 16% taller 5th gear (teamrip.com) | H4 conversion | push-button start | datalogger | HKS S-AFR | PLX WB O2 coming soon: adj. cam gears | bi-xenon HID retrofit
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#7
12-01-2004, 06:50 PM
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Re: Re: Re: interesting thread on 3si
Quote:
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 1992 3000GT VR-4 TOTALED  1991 figi blue VR-4 lots to come... 1993 civic hatchback 35-40 mpg of slow reliable daily driver 
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#8
12-01-2004, 07:22 PM
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Re: interesting thread on 3si
Another sweet thread...john monnin's write up on swapping in a 3.5L 6g74...and even talking about boring it out to 4.1 He actually has a detailed write-up...granted it isn't anything that'll be happening in my near future...but it's great to dream!
http://www.3si.org/forum/showthread....1&page=1&pp=10
__________________
96 3000gt vr4 -K&N FIPK -Proboost mbc -Cusco front + rear strut bars -Greddy type-s -ATR downpipe -no cats -15Gs, 3sx aluminum pulley, FMIC, SAFC, walboro pump, EVO 560ccs, and Meth Injection Kit all waiting to go in shortly. Your 1996 Mitsubishi 3000GT VR-4 is the 92nd out of the 315 that were made that year. Only 21 of which are exactly identical.
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