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Originally Posted by 83turbo' date='Jun 11 2004, 08:29 AM
Make sure the secondaries are working. I read (I think on the evil forum) that someont had a problem with this.
You can unhook the secondary linkage and see if it loses power, or put a screw in the linkage to force the secondaries to open. would have linkage for the secondaries might sound silly- but are you sure the carb is fully open at WOT? |
Originally Posted by Seraphx7' date='Jun 11 2004, 08:33 AM
Let alone a carbed one? https://www.nopistons.com/forums/pub...1047683561.gif a carb is the best way to get power from a N/A.
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it seems that most of the people who modify NA RX7s always
go carb to keep it simple I guess so that maybe that is the reason why its thought to make more power? |
Originally Posted by Seraphx7' date='Jun 11 2004, 08:33 AM
Let alone a carbed one? https://www.nopistons.com/forums/pub...1047683561.gif a carb is the best way to get power from a N/A.
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fuel injection is by far superior. power and tuning wise.
why do you think jegs has 3000 dollar injection systems for old skool chevys? it makes more power than carb. carb is just simpler, not better. stick with fi. |
Originally Posted by Rob x-7' date='Jun 11 2004, 02:47 PM
it seems that most of the people who modify NA RX7s always
go carb to keep it simple I guess so that maybe that is the reason why its thought to make more power? |
Originally Posted by Rob x-7' date='Jun 11 2004, 02:43 PM
he might have a 600 vacuum secondaries, only a 600 double pumper
would have linkage for the secondaries might sound silly- but are you sure the carb is fully open at WOT? rod coming from the secondary vacuum pod. Looking at a Holley, I also see that if you unhook this to disable to secondaries, it is also necessary to wire the secondary throttle shaft closed as there is no other spring. Then you just drive an note any power loss. If you don't see any difference, the secondaries weren't working to begin with. The other secondary linkage present on a vacuum secondary carb is the lockout that prevents the secondaries from opening before the primaries are open far enough. You can stick a screw in this one and thus make it force the secondaries to open (rather than just limiting when they can open). It's a rig, but makes for a useful test. If the car now has more power, you've got a problem such as a bad diaphragm (these get torn all the time when the vacuum pod is reassembled from a spring change due to the cheap nature of the diaphragm). |
holley's are too much trouble, get a demon or edelbrock. not too much more, and loads better.
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Originally Posted by 83turbo' date='Jun 12 2004, 03:49 PM
I'll try to clarify - the "linkage" I meant to is really more of an actuator
rod coming from the secondary vacuum pod. Looking at a Holley, I also see that if you unhook this to disable to secondaries, it is also necessary to wire the secondary throttle shaft closed as there is no other spring. Then you just drive an note any power loss. If you don't see any difference, the secondaries weren't working to begin with. The other secondary linkage present on a vacuum secondary carb is the lockout that prevents the secondaries from opening before the primaries are open far enough. You can stick a screw in this one and thus make it force the secondaries to open (rather than just limiting when they can open). It's a rig, but makes for a useful test. If the car now has more power, you've got a problem such as a bad diaphragm (these get torn all the time when the vacuum pod is reassembled from a spring change due to the cheap nature of the diaphragm). is gas coming out of the secondaries? |
Originally Posted by Rob x-7' date='Jun 13 2004, 10:58 AM
why not peek in the carb, open the throttle all the way and see if there
is gas coming out of the secondaries? they will barely move at all. They may open visibly if you rev the crap out of it. |
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