Panther550
Member
I was wondering out of all the VTEC engines (sohc and dohc) which require the use of high octane gas. And up to what compression ratio can i use 89+ octane gas in a sohc vtec engine.
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Originally posted by 2000Si@Feb 25 2005, 04:46 AM
i believe that 10:1+ CR is where you need to use 91-93 octane, but don't quote me on that.
i'm sure that sohc vtec engines all can use 87, dohc vtec B series all require premium.
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Originally posted by Panther550@Mar 7 2005, 01:10 AM
The reason I was wondering about the potential for a b16a was becuase i saw a supercharged z6 making 125 ft-lbs on a dyno sheet, and if i can get the transmissions to perform fairly smilarly the only other factors are torque and rpm.
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Originally posted by MikeBergy+Mar 7 2005, 02:34 AM-->Panther550@Mar 7 2005, 01:10 AM
The reason I was wondering about the potential for a b16a was becuase i saw a supercharged z6 making 125 ft-lbs on a dyno sheet, and if i can get the transmissions to perform fairly smilarly the only other factors are torque and rpm.
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First of all, 125lb-ft is not that much. My LS motor will make nearly that stock, and LS motors are a dime a dozen. Second, for $8500, I could buy a nice CRX, a BUILT LS/Vtec motor making more than 200 whp, and buy a nice suspension setup; my car would tear circles around whatever z6 build up you were talking about. ANd when you are talking engine weights, you have to remember that the difference in engine weights is less than 100 lb, not really anything to worry about. If you were talking about dropping an H22a into a crx, that'd be a different story, but you're not, so don't worry about it. And don't worry about running race gas if your aren't willing to fork out 500+ for custom pistons. You won't need it. Even if you were running PCT pistons in an LS block, you could probably get around it one way or another. I am going to be running ~11.5:1 in my LS build, and I'm going to tune for crappy California 91 octane, and I'm not worried at all. As far as the potential for a b16 over a D-series motor? The blocks are beefier, the technology is better, the aftermarket support is larger, two cams instead of one (excluding the 1 dohc d-motor), stronger connecting rods and crank, Better transmission gear ratios, More people familiar with tuning them, etc.....
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Originally posted by MikeBergy@Mar 8 2005, 12:13 AM
You can say that an ls tranny has tall gears and all, but overall it isn't going to be a big deal for me. I am going to stay with a cable tranny setup, and use my LS tranny until I can find a hydraulic gsr tranny and do a full hydraulic swap into the car. None of that hasport cable to hydro conversion garbage. You should price the ls again, I gaurantee it will not cost that much, even to ship it from the states. As for aftermarket, you won't need to modify the b16 tranny much, as it is already fairly short geared. And yes, the ys1 cable tranny from the 92-93 gsr will bolt to a b16a. ALL b series trannies will bolt up to any b-series motor, you just have to get the right number of splines on the clutch plate so it will match the transmission. Also, if you are willing to crack open a tranny and swap out gears, you have more experience and money than I do. I won't touch a transmission until I have at least 3 grand in the bank and a couple more years of engine repair experience under my belt.
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Well I've actually emailed a few places based in the states and they'd told me it would cost about $500 US to ship any engine to canada. And the only other places for engines are either onine stores or ebay.ca, I've yet to go to any non-online stores in my area and I don't have enough mechanical knowledge to go to a scrap yard and find a motor, so I don't know, and the only b18b i've seen for sale online in canada was @ jspecauto.com going for $990 US engine only. Although I still don't like the idea of having to buy springs right after swapping in a b-series engine, don't get me wrong i love NA, but the supercharged z6 just seems like a lot less hassle.
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Originally posted by ktanaka@Mar 8 2005, 02:11 PM
Flat out, the best performance to money in that car is going to be an LS motor with a Y1, S1, or J1 tranny (JDM B16 tranny). You'll make 120ft*lbs torque and 140hp and you'll have the option of later swapping the head to a VTEC one. You should be able to find an LS motor for about $500, a b16 tanny for about $500, put $500 into mounts, SL, and swap related shit, and you have a monster CRX for under $1500USD.Â
I have a b16 in my CRX and I can tell you that it is an awsome swap. It makes mad power up top and is fun as hell to drive. I also get really good gas milage and its runs just fine on 91 octane gas. However, the swap cost me a little over $3000USD.Â
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