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#1
10-11-2005, 12:33 AM
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TB Porting... 55 or 60?
Im going to get my TB done. Is there any downfalls on a NT to get a 60mm bore? Again, Im looking for the most power. Is there a benefit for the 55 over the 60, or is 60 good? Thanks
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2013 Chevy Sonic 1LZ Daily Driver, 1.4L Turbo, 6spd 75 Monte Carlo SBC 400 6.6L, Aluminum heads, Hurricane Intake... 12 Chevy Sonic 1LZ 1.8L - Traded 01 Pontiac Grand Am SE - RIP 95 Eagle Talon ESi-T 5spd - RIP 88 Oldsmobile Cutlass Ciera- RIP 
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#2
10-11-2005, 02:27 PM
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It might just be a rumour, but I have heard that if you go as big as 60 mm, your car will eat gas like crazy. It will definately give you more power though over a 55 mm.
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'92 3000gt SL Zoom Stage 1 Clutch Quote:
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#3
10-11-2005, 02:52 PM
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Re: TB Porting... 55 or 60?
I was looking into this a year ago. I think I remember seeing a dyno of a 420A with a stock TB and then a 55mm TB, and there was virtually no difference. The Eclipse was turboed, too... So I would have expected the difference to be pretty drastic. All in all, I think that there are other mods that you'd be happier with performance wise. (Unless you do your own porting on the stock TB.) Just get some headers! My
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'98 Eclipse RS ENGINE: Twin Ceramic Ball Bearing T3/T4 with ceramic blades (20G for sale!), FMIC, 3'' Intercooler Piping and Down Pipe, Dump after Down Pipe, Walbro 255 FP, 450cc 4G63 Injectors, Greddy E-Manage, TurboXS DSBC (4/7psi for now). SUSPENSION: Sustec Front and Rear Lower Tie Bars, Suspension Techniques Front and Rear Sway Bars, DC Sports Front and Rear Upper Strut Tower Bars, Eibach Pro Kit Springs, KYB AGX Adjustable Struts, Polyurethane Bushings Everywhere.
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#4
10-11-2005, 02:57 PM
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Re: TB Porting... 55 or 60?
i think it would help if you had everything else ported too...intake/exhaust runners and ports with a full exhaust system. then it would increase overall flow, but otherwise i don't think it would help.
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95 Talon TSI AWD 97 Eclipse GST 
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#5
10-11-2005, 04:56 PM
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Re: TB Porting... 55 or 60?
"Just get some headers!"
Already got a header. I haven't seen a 4-banger with multiple headers in awhile. Well, I got the full exhaust and the CAI. Seems to me like that would be the next thing to get done. Got some more air coming in, and going out. This would help alittle more, right? Anyone here have a ported one and seen a difference? Thanks
__________________
2013 Chevy Sonic 1LZ Daily Driver, 1.4L Turbo, 6spd 75 Monte Carlo SBC 400 6.6L, Aluminum heads, Hurricane Intake... 12 Chevy Sonic 1LZ 1.8L - Traded 01 Pontiac Grand Am SE - RIP 95 Eagle Talon ESi-T 5spd - RIP 88 Oldsmobile Cutlass Ciera- RIP
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