ok, as far as reading material:

chilton's manual- local parts store
hayne's manual- same local parts store
Mazda shop manual- mazda dealership

i think its sposta kick in around 2800-3200 rpm. its sposta be a steady pull that sits u back in the seat. not a jerking feel.

i would say its NOTHING like my 400 pontiac equipped 79 Trans am, w/ a Holley 850cfm Double pumper: lights up the tires as soon as u punch it, even at 55 mph. a turbo is a steady surge of power. and it should be noticible, fairly obvious.

sorry if im not much help, im an NA guy...

chris

 

I also just picked up my first RX-7 that happens to be a TII. I don't know a heck of a lot about turbo's either but it sounds like there is something wrong. In my 89 TII it starts kickin' at about 2800 with my foot in it alittle. It should defiantly be noticeable and if it's not there could be something wrong with the turbo (but this is just my guess).

I'm just about to put my links page up on my site, so check it out there will be a bunch of good stuff focused towards turbo's. http://members.frys.com/~rtm/rx-7/

I would suggest that you should post this in the second generations single turbo's section there is usually someone around that knows about these issues (general help is just that, general). Sorry I can't help more.

 

check all ur vacume lines and hoses....my car was running real crap and gutless, I thought it might of been on its way out, but on closer inspection i found 2 vacume lines that had come off(or never been put on) and another two that had cracks in them...my car runs MUCH better now one of the cracked ones was goin to the boost guage and it wasnt working properly either.

 

We've got an '87 TII, and this is what happens. Anytime I give it a lot of throttle below 2500 rpm, the boost guage goes to about 0 (20, the bottom reading on the guage, is vacuum, 0 is 0, no boost or vacuum, anything higher is boost). After 2500 rpm the guage will read about 15. At this point, there is a mild but noticeable surge in power. At about 3500, the guage will then climb to about 35. From that point, the power really comes in. I feel like I am in a jet and somebody just kicked in the afterburners! Call it a surge, kick, whatever, but it certainly is noticeable! The first time I took Keith out in the car after fixing a secondary injector problem (1 injector was not working), he kept yelling "Oh S--t" for 10 minutes. Now, he is not new to RX-7's - this is our third one (1985 SE, and 1988 SE). Conclusion? Something's wrong, imho. Good luck!

Irv, Keith's dad

 

Technically speaking? You will get boost at about 3800rpm. Since you just bought your car, the car will buck at 3800rpm or stall..this is an ECU flaw. But after that, the car should give a fairly noticeable push.

When I first bought the car, it wasn't that noticeable either since I owned a ProbeGT that had more torque..

There could be something wrong with the car, but then again, there probably isn't anything wrong. That boost gauge didn't move much with me either but it did go about halfway when I was in 3rd or higher gears.

No. A turbo is a wheel that spins from the exhaust gases of the engine. It is always spinning but there is a threshold whereby it will spin at a certain speed that will start "pressurizing your intake manifold". This is what we call boost. You won't get full boost in 1st or 2nd gear unless you have some controller that keeps the wastegate closed. There just isn't enough load on the engine for that.

Get some exhaust and you'll feel the "kick" then.. Seriously, what "mark" are you talking about? You should get the needle to go above the zero mark. If not, then your turbo is bad. A leak in a vaccum line or intercooler piping would cause your car to hesitate and idle like crap. A bad turbo seal would cause your turbo to lose its free-play and the wheel will be rough and hard to turn..thus giving low boost.

-M

 

Do yourself a huge favor, and either buy a downpipe, or gut the pre cat.It is more than likely clogged(depending on milage and how rich the car is running).It connects directly to the exhaust side of the turbo.If the pre cat is clogged, exhaust gases can't escape quickly, which means they move more slowly past the turbo.This means the turbo won't spin as quicky as it should, and you will make less boost.After gutting my pre cat, I gained quite a bit of lost power.I get a really nice kick in first as soon as I hit 4000 rpm.The rest of the gears just pull really nicely.On my old tires, I could be driving slowly in the rain in first.Step on the gas, and right at 4000, the tires would break loose.I could also spinn 2nd at 4000 too)without even dropping the clutch .After replacing your pre cat, or gutting it, you will like your car 5 times more than you already do.Good luck