Hello, Everyone! I'm trying to build my 91 MR2. I have the N/A, so it's not easy. I've done most basic mods, I'm looking at increasing my track times. I've been looking at DEI Cryo2 and the JET computer upgrade or the V-force. Will Cryo2 help? Will the JET upgrade or V-force module do anything? Thank you in advance.
Thank you for the information. Cryo2 is co2 bottled like NOS except not flammable, DEI makes it, there is intake cooling, and fuel rail cooling. The JET chip is a computer upgrade to reprogram the computer so it recognizes the modifications done to the engine (like header, cold air intake, etc). I was hoping somone has tried either of them.
lol...i put headers and a intake on my old 5sfe...the engine blew out but sounded soooo badass(main reason was i cut all my exhaust off and it was straight headers no cat no muffler NOTHING)
Thank you for the information. Cryo2 is co2 bottled like NOS except not flammable, DEI makes it, there is intake cooling, and fuel rail cooling. The JET chip is a computer upgrade to reprogram the computer so it recognizes the modifications done to the engine (like header, cold air intake, etc). I was hoping somone has tried either of them.
How much of a history does this JET thing have? When you start talking about piggybacks and engine management that isn't tuned on a dyno it makes me a little nervous because if it leans the engine out too much you can destroy it. If it works though, that might be pretty cool.
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"Our Lady of Blessed Acceleration, don't fail us now!" -Elwood Blues
That's what I'm looking for, anyone who's done either of these mods to an MR2. I can't find anything supporting or warning about either of the two. JET says they upgrade MR2 ECU's but I haven't been able to find anyone who's had it done, to see if it hurt the engine or if it made any difference. The company has been around for 35 years. But how many MR2's have they tested? Basically, I'm running out of Mods for the 5sfe and am trying to avoid the 3G swap. As far as installing NOS, I'm not sure about that either, I don't know if the 5sfe can handle it or if I would feel safe still driving the car. And finding interior engine performance parts is next to impossible. Got any suggestions? Thanks for the help.
I would avoid NOS (or NOS alternatives) unless you're drag racing the car and don't care how long the motor lasts. There just isn't any good reason for it.
Have you looked into what kind of history the manufacturer of the Jet thing can provide and what kind of guarantees/warrantys they have?
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"Our Lady of Blessed Acceleration, don't fail us now!" -Elwood Blues
Staying N/A isn't so bad, but having 2 extra cylinders and more displacement helps.
E.L. Prototypes also did ECU modifications for the 5SFE powered MKII, but it was pricey, for very little gain. ~$740 for about 10hp/15lb-ft. All they do is tinker with the fuel maps a bit to lean out the mixture. You can do that yourself with an AFC, but I wouldn't recommend it without pulling your injectors to have them cleaned, balanced, and blueprinted.
Also note, older ECUs are not reprogrammable. They do not contain a flash EEPROM, so many of the programs in the ECU are hard wired unless you solder in a new chip. Also note, the ECU is an 8-bit unit. 8-bit is useless for anything complex. My 2000 1MZ ECU is a 32-bit unit, so it runs circles around the older 5S ECU.
With that said, don't waste your money on that Jet chip. It won't do anything useful. You can improve the flow of your 5S by selectively modifying intake valve areas. There are some places in there where you can smooth flow, which will create more horsepower and a faster revving engine. Air turbulence creates the torquey motor that the 5S is, so you might lose a bit of low-end for top-end. Increasing valve size and modifying cams are also other options.
Thanks for the help everyone. I currently drag race and just need better times. I'm running out of smaller options, so I'm looking at the bigger ones, while trying to keep the 5s, because I know my engine so well. I've looked into a few things, but they're all around the same price range, including swapping my engine for the 3g. I've heard cams are a good idea, but I have two questions about that.
1. How hard is it to do in the MR2 (ie I'd like to do it myself)? Can it be done without pulling the engine out?
2. Where do I find performance cams for the 91 NA?
1. How hard is it to do in the MR2 (ie I'd like to do it myself)? Can it be done without pulling the engine out?
2. Where do I find performance cams for the 91 NA?
Melinda
Cams are pretty easy to change out. It can be done with the engine in the car. TED Components and Webcams do regrinds. With a grinded cam, you have to measure and reshim buckets as necessary. With a custom made cam (expensive), you do not have to reshim everything.
I've been looking at DEI Cryo2 and the JET computer upgrade or the V-force. Will Cryo2 help? Will the JET upgrade or V-force module do anything? Thank you in advance.
Cryo2 is compressed CO2 applied to intake (NOT mixing with intake air) to cool it down. Not much use unless you can keep the whole intake manifold cool.
Jet V-Force works pretty well but you should look into full programmable ECU.
I got 1 sec better on 0-60km/h.
Its not hard to get NA power, its just expensive.
Custom 11.5:1 piston will cost you $1500. P&P $800. Cams $800. Lighten, balance crank $500.
Thanks for the info. It looks like weighing my options is the next step in the project. I haven't been able to find performance engine internals for the NA, so other than cams, I need to do more research.
Thanks for the info. It looks like weighing my options is the next step in the project. I haven't been able to find performance engine internals for the NA, so other than cams, I need to do more research.
Chances are, you won't find any. The 5SFE isn't a performance motor nor does it try to be. Most of the aftermarket is with the 3SGTE.
My 1MZ isn't a performance motor either, but at least there's a TRD Supercharger for it.
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