2.2L Engine Rebuild for Withstanding Higher Level Forced Induction - Page 8 - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #71 of 72 (permalink) Old 04-24-2014, 08:47 AM
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Plain you're on the right track there in a way. Boosted cars typically run lower compression ratios yes, but only from the factory. I can explain it for you guys in a quick and simple way (I can do further explaination in detail off this topic tho if you message me).

Lower Compression Ratio = Less Torque = More Boost that can be achieved "safely" without Knock on lower grade fuels = Lower engine temps

Higher Compression Ratio = More Torque = Less boost needed to make the same power, BUT requires a higher grade fuel to keep from getting knock (to a degree) = Higher engine temps.

Keep in mind tho guys, boost is NOT the measurement of power, boost is the measurement of restriction, so more boost does NOT always mean more power. More boost giving more power is only when you've maximized the flow potential of the engine and it will not flow anymore and you want to add more to it.

Cobaltftw, you can go with the .040 HG, it will bump up your compression by like .03 or something like that. It's not a lot so it's not even something you should fret upon a whole lot. Just make sure you do a good amount of logs to get the tune back in touch with reality. Any slight bump in compression means you really only need to add a little more fuel and possibly take a little timing away at first then you can bump it back up as you log.

'09 SS/TC - Stolen
Mods - Injen CAI, CIA MAF Relocate CP's, Dejon FMIC,
Custom 3" DP, 3" Exhaust, GT3076R, Pioneer AVH-4100DVD, Hurst STS, ZZP triple pod, Autometer Cobalt boost/DPIC/WB gauges, Nitto NT05 245/40/18's, H&R Springs, 80:20 Meth Spray
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06 EVO IX MR/SE - Sold
Mods - *Updated 10/6/13* AEM TRUboost EBC, 4in custom TBE, SD dual 93/e85 tune, ETS 4in Race Core FMIC, Dual Aeromotive 400lph Fuel Pumps, T4 Tubular Manifold w/ dual WG's, FP Super99HTZ DBB Turbo, GSC 274 mivec cams, ARP headstuds/rod studs, FIC 2150cc Injectors, Aeromotive FPR, Aeromotive Fuel Rail, catch can, Mini Battery Kit, Slim Coolant Fan, Kiggly Racing high pressure valve Springs/Titanium Retainers, Supertech Stainless Steel Valves, Dual VTA Tial 44mm WG's, 4g64 Stroker Manley Pistons, 155mm 2.4 LR Manley Turbo Plus I Beam Rods with ARP 625 Studs, 100mm forged non-billet Manley Crankshaft, Full H/E PNP with Port Matching, Kiggly Racing Girdle, Dual Tial 50mm BOV's, Excedy Triple Disc Carbon HD Clutch, AEM EMS

'95 Ram 2500 Diesel
Mods - 5in TBE, Boost Elbow set to 28psi, Adjusted fuel pump, Open Turbo.

Future Mods- Super Street Clutch (rated @1400ftlbs tq), 67mm turbo, 160lb valve springs, added timing, tubular exhaust manifold, larger injectors, possible 6 spd swap.


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post #72 of 72 (permalink) Old 04-24-2014, 08:55 AM
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oh ok awesome, that definitely makes more sense now lol .040 it is. thanks for the great explanation.

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