How does this damn turbo supposed to work?
#1
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How does this damn turbo supposed to work?
I must bow to the wisdom of the many intelligent RX-7 gurus on this forum. I have what may be a very simple question about my 1988 RX-7 Turbo II. I have just purchased it and am curious about the turbo. Could some one please tell me when the boost is supposed to kick in? I had driven other RX-7's but never a Turbo II, until now. I drove it on the highway and noticed that the boost gauge would barely move or go just close to what looks like a mark where it would "kick in" but just not go that far. I have not tried to do an acceleration from a dead stop yet and was wondering if this is where the turbo does it's thing. While on the highway I kept it tame only traveling between 50 to 100 mph. I was waiting for this infamous "kick" to take place, but it never seemed to happen, nor did the gauge quite make that "mark". I have no owner manual so I turn to you. Is this a problem? Also, is there a website where I may either purchase or download an owners manual for this beauty? Thanks in advance for your help.
#2
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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
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
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Re: How does this damn turbo supposed to work?
Originally posted by f16flyer
I must bow to the wisdom of the many intelligent RX-7 gurus on this forum. I have what may be a very simple question about my 1988 RX-7 Turbo II. I have just purchased it and am curious about the turbo. Could some one please tell me when the boost is supposed to kick in? I had driven other RX-7's but never a Turbo II, until now. I drove it on the highway and noticed that the boost gauge would barely move or go just close to what looks like a mark where it would "kick in" but just not go that far. I have not tried to do an acceleration from a dead stop yet and was wondering if this is where the turbo does it's thing. While on the highway I kept it tame only traveling between 50 to 100 mph. I was waiting for this infamous "kick" to take place, but it never seemed to happen, nor did the gauge quite make that "mark". I have no owner manual so I turn to you. Is this a problem? Also, is there a website where I may either purchase or download an owners manual for this beauty? Thanks in advance for your help.
I must bow to the wisdom of the many intelligent RX-7 gurus on this forum. I have what may be a very simple question about my 1988 RX-7 Turbo II. I have just purchased it and am curious about the turbo. Could some one please tell me when the boost is supposed to kick in? I had driven other RX-7's but never a Turbo II, until now. I drove it on the highway and noticed that the boost gauge would barely move or go just close to what looks like a mark where it would "kick in" but just not go that far. I have not tried to do an acceleration from a dead stop yet and was wondering if this is where the turbo does it's thing. While on the highway I kept it tame only traveling between 50 to 100 mph. I was waiting for this infamous "kick" to take place, but it never seemed to happen, nor did the gauge quite make that "mark". I have no owner manual so I turn to you. Is this a problem? Also, is there a website where I may either purchase or download an owners manual for this beauty? Thanks in advance for your help.
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.
#4
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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.
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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
Irv, Keith's dad
#6
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Thank You Guys
Just wanted to thank everyone here for thier input on my lack of output (sorry, its real late)! Not to late to go check some of this stuff out though! Everyone of these replies is very useful to me. Oh, hello again Irv (I think, or is it Keith?, my money is on Irv) and thanks AGAIN. You replied to me ECU "oppertunity" also and your back with some more great words of wisdom! So, all you gurus out there, please keep up the good work long enough for me to get a handle on the TII's. Then I can help other like you are now doing! This is my second 2G, but my first Turbo, so I need all the help I can get. I love these RX-7's so much I refuse to call them a mere "car". Sold my last one to get a Camaro and yes, grown men do cry, at least until they get another RX-7! I may be crazy, but I cant stand ANY piston powered piece of sh*&! It sounds like this is the place to be though because it seems that just about everyone is as "crazy" about the Rotory engine as I am! Thanks again and I am off to check on all of these things you good people wrote about!
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Re: How does this damn turbo supposed to work?
Originally posted by f16flyer
Could some one please tell me when the boost is supposed to kick in?
Could some one please tell me when the boost is supposed to kick in?
When I first bought the car, it wasn't that noticeable either since I owned a ProbeGT that had more torque..
I drove it on the highway and noticed that the boost gauge would barely move or go just close to what looks like a mark where it would "kick in" but just not go that far.
I have not tried to do an acceleration from a dead stop yet and was wondering if this is where the turbo does it's thing.
I was waiting for this infamous "kick" to take place, but it never seemed to happen, nor did the gauge quite make that "mark".
-M
Last edited by TBoost; 08-15-01 at 12:37 PM.
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#8
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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
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