Brawlender

Hey everybody. I feel like my question might be especially newbie but here goes anyway.

In 1st, and at around 6000rpm+ (full throttle) i notice a pretty significant loss in power.

Is this just something that happens? as in I just dont know how to drive with power yet? or is this a mechanical issue that must be sussed out.

does this have to do with the 5th and 6th ports (still dont know what to look for, images helpful) that open at 4500+ rpm and VDI?

This is my first car and I'm without any guidance when it comes to cars. If you think I'm doing something dumb and wrecking my ride, please post with haste.

1991 convertible.

Hawaiian Punch

Hey Man, Got the exact same problem.

Check out my thread.
https://www.rx7club.com/new-member-rx-7-technical-256/test-drove-89-rx7-today-987322/

I also think its the 5th and 6th port problem.

whoknows

Read this,
http://www.aaroncake.net/RX-7/6porttest.htm

Hawaiian Punch

It could really be it but it felt like more than just 25hp loss.

whoknows

I think if your losing more than 25hp, you have a much bigger problem. On an engine thats 160hp, 25 is quite abit when you consider the money and time spent on getting more. A better exhaust is only going to get you maybe 7 more, acouple more for a CAI or freeflowing filter for example. Its really not that hard to pull the actuators off. 2 bolts and a vacuum line. You can then either then blow 2lbs of air into each one and see if the rod is moving freely. They should actually move freely by hand. Also make sure you can turn the rod the actuators hook to for opening the ports to make sure they move freely. This is one if the first things I had to do on mine after I bought it. One of mine i discovered was hanging up. I was able to clean and free up mine. If you do do this and and all is well, you can at least eliminate it as the problem seeing as its not hard to do. Itll get hard if the actuators are good but the rods in the sleeves of the intake that the actuators open are seized up.

Brawlender

so that means when in first gear, and full throttle from 3000rpm to whatever, i should feel the same or more power? Can someone confirm or deny that? (also, tell me if that is a bad thing to do)

whoknows

Whats the car doing or not doing that has you wondering? Does it hesitate or does it just not rev as fast? Is your clutch slipping at higher rpm provided its a manual trans? Rpm's climbing quickly but the car isnt speeding up with the rpm's would seem to be a bad clutch. You can check your coil packs with a VOM and compare to what the correct specs via the service manual to say their not shutting down or functioning intermittedly. Maybe your secondary injectors are clogged or leaking as they dont fire untill the higher rpm range as where they would have to be checked. To many things could be a problem to just say it seems like its lacking power. Your gonna have to be specific. Whens the last time a full tune up was done? If not recently, id say start there with a full tuneup then move on from there or if you have a good rotary shop in your area then take it to them and have them do a diagnostic and check it out.

Brawlender

So, first i don't think its a slipping clutch(emphasis on think), the tach doesn't climb when rapidly accelerating.

so when accelerate from a stop in first, the car pushes consistently up to 5000rpm or so mark, then (like a light switch) the harder push on my back stops and it continues to accelerate slowly.

I just got this car, and I haven't had a chance to give it a tune up yet. Should I put this problem on hold until I get that done? Also, thanks for the info about the secondary injectors, this list of things I don't know about cars is immense.

This Friday/Saturday will be the first day I will get to do a totally full examination of what is going on in my car(to the extent of my knowledge.)

whoknows

I'll tell you man, this site is great and so are the members on here. You may not always get the answer you wanna hear but you will always get the answer you need to hear, lol. Like me, i think you would benefit alot by going to the freq asked 2nd gen thread thats in this same section and scroll down till you find the links posted for the service manual and go through it. Its helped me out alot along with other members on here esp if you dont know the lingo used by the really knowledgible guys on here. And dont be afraid to pm one of these moderators. They have great knowledge and are good about helping out the new guy. I had one in particular really help me out alot. I figured one of the guys or gals woulda chimed in on this by now. But i had one tell me one thing i already knew when I bought mine, do a full tuneup so you can at least know where the proper maintenence starts. Belts, plugs, wires if they look bad, check for busted or rotted vacuum lines, change the oil, filters and so on. Keep posting and check out that manual.

Brawlender

thanks for the advice, I went through the FAQ by itself, and saw a lot of information that looked useful, but didn't quite apply to to my particular problem. I didn't look at the service manuals because i figured I'd have to figure out what the problem was first, before going to them for the instructions on how to fix it. You're right, I should read it anyway.
More posts with more information.

I feel like maybe an FAQ isn't the best format for engine problems. Like in this particular case, by reading through the FAQ, i learned about the existence of the 5 and 6 ports and the VDI, but didn't even know that there were secondary injectors. Would something a bit more through about the internal workings of the engine (but not a service manual guide) be helpful?

I'm only half volunteering.