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#1
10-19-2003, 01:46 PM
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91 rx7
i just put my 91 rx7 5spd on the road and i want to do a few mods, does anyone have a suggestion on the best basic bolt ons for more hp? is there any secrets to working the engine, or cheap changes that can be done?
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#2
10-19-2003, 02:33 PM
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You know this is a Honda forum right? Not much people here are into the rotary but anyways.......is it the NA or turbo one? In any case, I suggest replacing all vacuum lines and apex seals before any performance parts are added. For the NA basically you can do the same basic bolt ons as a Honda but for the turbo I suggest upgrading the cooling system before other common turbo upgrades are made. Cheap changes??? No such thing.
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#3
10-19-2003, 10:33 PM
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Re: 91 rx7
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#4
10-19-2003, 11:52 PM
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It depends on your rotary skills, because if you do your own work than it won't cost much. If you live in an area that has no rotary specialists your screwed and even if you do have em handy the cost is up there. I'd check with the previous owner to see if he's done either. The main problems are what I already listed, seals, vacuum lines, and cooling. That's why they aren't very popular. The rotary is ahead of it's time and specialists are few and far between. I'm currently looking for an FC or FD and I still have much to research. Study up young one.
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#5
10-20-2003, 02:46 AM
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Re: 91 rx7
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#6
10-21-2003, 12:48 PM
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K first no reason to replace the apex seals unless the compression is getting low. It will get lower with age like any car as the apex seals work like a spring so the less seal there is the more the spring is stretched and the less compression it has on the seal...think you get the picture so check the compression. If it is getting low you will want to rebuild before you go much further. I'd actually suggest buying a busted 1st gen GSL-SE as it will have the same engine 13B except it will have 3mm apex seals instead of just 2mm as the newer 13B engines do. It does weigh a little more but it is worth it. You should be able to find a wrecked one for cheap and have it rebuilt and it won't be anymore expensive to rebuild then the one out of your current car. From there just follow with most cars I/H/E another good thing with those cars is to get it fuel mapped with larger injectors as since it doesn't have a crank/rods/pistons to bust like a normal engine you can take the rotary up to crazy rpm's and not worry about throwing a rod or anything like that. Also another thing is the oil pump depending on your driving style you may consider mixing your fuel and having the oil feed that the motor normally uses cut off. Under hard accell. the oil can't keep up and it just burns the engine like crazy. Also regarless upgrade the cooling and get you a good aftermarket temp gauge as overheating once in these engines can be deadly to it.
http://www.pettitracing.com/ Pettit Racing sells the oil you can mix with gas. As for the vacuum go ahead and dress the engine up a little with all the vacuum lines as it shouldn't be much more expensive and the rotary does need VERY accurate readings for everything to work right. Jared
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