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| Engine, Transmission and Drivetrain Discuss Engine, Transmission, Drivetrain, and all other performance modifications here. |
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#1
07-07-2006, 11:30 AM
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Boost
How many pounds of boost can you run on the 8.5:1 compression ratio before haveing to use above 91 octane.
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#2
07-07-2006, 12:17 PM
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Re: Boost
you should always use 91 or above no matter how many psi you run, My car only drinks 93.5
__________________
 2004 Flame Red SRT-4 |Audiobahn 1200Q|Rockford 602s|Jensen flip out dvd| Mods: 
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#3
07-07-2006, 12:41 PM
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Re: Boost
It all depends on your car and modifications. Do you have an upgraded fuel pump and injectors? do you have a way of controlling those injectors? What turbo are you running? you should have your mod list in your signature. we need a little more info before we can answer that.
__________________
1998 Eclipse GSX 6 Bolt swap MHI Big 16g FP Race Manifold Apex'i N1 Cat-back Apex'i N1 Downpipe Walbro 255 fuel pump GReddy Type S BOV Turbo XS Boost Controller Balance Shaft Elimininator ACT 2600 RRE 11lb No Name Flywheel Prothane Motor Mounts Tokico Illuminas Advanced Handling Kit RRE Front and Rear strut tower bars RMDSM Front and Rear Sway Bars TRE Stage 2 Tranny ARP Head Studs, Main Studs, Rod bolts
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#4
07-07-2006, 03:02 PM
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Re: Boost
8.5 isn't too high. I would say a few psi less than if you were on stock compression, but the only way to find out it to actually test it man. Most people that do it say it's completely worth it though.
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now - 2000 civic soon - 2002 is300
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#5
07-07-2006, 06:25 PM
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Re: Boost
92-93 FTW. I wouldnt run anything less. $3 more per fill up is way cheaper than rebuilding your engine because you knocked like hell on 87.
__________________
 Build on hold until I get a good paying job, either in school or once I get out. At that time a full tear down and complete rebuild should be in order. The Purple People Eater will ride again... January 2011 can't come soon enough.
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#6
07-08-2006, 01:22 PM
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Re: Boost
Some areas only get up to 91 octane.
Unfortunately, it is completely impossible to answer the question in the original post. The only way to know how much max boost you can safely run is to datalog the car while raising boost and watching knock (and AFR if you can afford it).
__________________
Kevin Jewer RWD Talon - 7.92 at 180 Mightymax - 10.7 at 125
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#7
07-11-2006, 11:20 PM
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Re: Boost
yea and thhat is cali for you, 91 is our premium
 n:
__________________
-1997 Eclipse Spyder GST |Stock| -1990 Eclipse GSX |ACL Main & Rod Race Bearings|Balance Shafts Removed|ARP Head Studs|Cometic HG|FP 20g TDO6H|EPROM Chipped (stutter box 5k, fuel comp.)|PTE 680cc inj.|Walbro 255 HP Fuel Pump|Autoteq FPR|SAFC 2|FMIC|2g MAF|Dejon Tool Hard Pipe|Greddy Type S|MBC at 17PSI|Ported 2g Exhaust Manifold|02 Housing w/ Tial 38mm WG|Full 3inch Exhaust w/ Y-pipe Cutout|Fidanza Flywheel|ACT 2100|4 Bolt LSD Rear|Poly Mounts|KYB AGX Suspension|Roll Bar|
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