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how many pounds of boost can our 1.7 engines handle? cause i went to my mech. where i work on my Eclipse GSX and the mech. told me with our engines the max it can handle is 5-10lbs max....i mean that dun sound like a lot of boost to me...why spend all that money on a turbo with 5lbs of boost? maybe some of your guys should save up for a car that is already turbo charged... cause the 2k1 is a great daily driver...well at least thats wut i use it for...if any one did some research on how much boost our cars can handle pls let me know.
p.s. i'm not tryin to diss anyone here but i justed wanted to know how much more power our cars can get with a turbo...

 
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I had a 1.8 L and had turbo charged the motor and boosted about 7PSI. That was the most I ever boosted and it created a nice pull. However, I believe that if you open up that motor and work it a bit, you may be able to boost a bit more than that.

Yet I think you're right. I believe that the more horsepower you start off with.....the more you'll end up with. i am a strong believer in that. Not only from experience but from educating myself about the subject.

Just my opinion.
[IMG]i/expressions/face-icon-small-smile.gif[/IMG]

 
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If you have the fuel delivery issue solved, then I would guess that we could do about 6psi - 8psi for an LX and 4psi - 6psi for an EX. If you get a new head gasket that will help seel the engine more and lower the compression at the same time, then I think you'll be able to run 1psi - 2psi above the numbers mentioned. Then if you run an intercooler you might be able to bump that boost up another 1psi - 2psi.

The lower the compression the more boost your engine can handle, but the horsepower gain to boost pressure with lower compression curve is a logarithmic one. That means that you'll see less and less gains in power by lowering the compression and raising the boost than you would at the onset of doing so. I think that there is also a point where your total power output will start to drop off. I bet that you could calculate the optimum compression and boost pressure using some hard core physics. I think I'll start reading up on this soon.

 
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eww...physics

 
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Grey

A great book that gives good formulas for calculating compressor/turbine size, intercooler area, and other good stuff (including probably the compression ratio / boost pressure, which is what you're looking for) is 'Maximum Boost: Designing, Testing, and Installing Turbochargers' by Corky Bell. Another older, but more theoretical and mathematically-inclined, book is 'Turbochargers' by Hugh MacInnes. Hope this info helps.

 
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<< eww...physics >>



Hehe, I know what you mean. I was going to major in physics, but after two years I switched to computer science. Too much theory and not enough application for me.

htowncivicEX: Thanx! I'll check those out. I wonder if my local library has them? As soon as I'm positive about any of this stuff I'll share what I figured out of course.

 
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5-6 pounds daily driving will be fine

 
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i know where u guys are comin from...but how much is a turbo gonan cost with labor? with that kinda money and save up a little u can put some down payment on a used DSM. A car tht came with turbo is always better than one that didn't because the engine was buitl and ready for a turbo, with our 1.7's if we push it the engine might be able to withstand the pressure cause it wasn't built for that kind of force. i mean NOS is a temp. thing..but with a turbo won't it put a lot of strees on the engines....oh yeh if any of guys actually get teh turo when it comes out make sure u get the turbo timer..i had to learn that the hard way with my old DSM. ( i didn't know $hit bout car back then) so they really messed up my turbo.

 
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oh yeh and our cars are SOHC, and most turbo cars have DOHC..which mean our cams work twice as hard...

 
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Actually, nitrous raises the compression of an engine just like forced induction (supercharger or turbo). I'm not sure what you meen by SOHC engines having to work twice as hard? All DOHC engines allow for is the adjustment of the intake valve timing independent from the exhaust valve timing. Anyway, I wonder what the weakest part is in our engines? What will go first if we run too much boost? I think the cylinder wall is one of the last things to go. I think the head gasket is an area of weakness for sure. Then the connecting rods. The pistons rings might have to be replaced next. Maybe thicker viscosity oil should be used? The spark plugs should be upgraded. The ignition system should be upgraded. The last two are to prevent detonation though. The extra heat that is generated might need to be shed through the use of an intercooler and an oil cooler, and maybe a bigger radiator or at least upgraded radiator fans. Better radiator fluid, or maybe just adding Water Wetter should work as well.

 
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great feedback grey..learn something new every day....about the SOHC vs DOHC i had this disgussion with my friend about it b4 i got my 2k1...he was tellin me that SOHC work a lot harder because with DOHC it splits the work in 2...but i was thinking that when u divide things into don't u lose power so shouldn't SOCH be better? but anyways then he dissed me and said all the good cars including th GSX i had in my garage was DOHC...then i had an epiphany...and was like [IMG]i/expressions/face-icon-small-confused.gif[/IMG]
well like u said grey i need to do som readin on this topic....

 
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you can run about 6 psi of boost fairly safely for about $3000, most kits at that price will include bigger injectors and a pump, for every 1 psi of boost you get roughly 7 hp, which means you've got apprx 42hp, thats comparable to NOS except you have that power all the time, if you intercool the charge and make the air more dense you'll see about another 10 to 15 hp at 6psi at the cost of an additional $1000....so at apprx $4000.00 you've got about 60hp, and it will be very reliable because the intake charge is cool and it's only 6psi......that sounds good to me.....+ with the relatively low 9.5:1 comp of the lx, you can probobly run intercooled boost up to 8psi with little worry, that should be good for around 20 more hp....add 80 hp to your civic and go race a dsm, see what happens......at $4000 you're still a cheaper package, and if you want to do some internal engine work you can boost up to around 15psi safely, i know, i know, you can just bump up the boost on a dsm, but hey, don't forget, it's still a piece of sh*t chrysler omni w/ a turbo.............

 
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umm..yeh race a stock dsm but if i put 4k on my GSX i can get over 400 hps...so....

 
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didn't some1 say they were gonna get a custom turbo? how much does that cost?