1991 NA topped out @ 110 mph... Now that dont look right, doesn't it?
06-12-07, 04:10 PM
#52
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new. same problem
Hello everyone.I just purchased a 90gtu about 6 weeks ago. it only has a header as far as mods go. My car also tops out at 110mph?? can anyone give some insight as to how i need to check ports 5 0r 6, where they are,etc...My knowledge is limited to honda's or at least smaller 4 cyl.(i know i know)
I just got a haynes today so ill be reding up...
thanks.
I just got a haynes today so ill be reding up...
thanks.
06-12-07, 09:25 PM
#53
Automatic = Power drain
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sorry about the blurry pictures, it is dark here and hard to focus.
The first picture should be recognizable
The second one (although blurry) is closer to the car
The third one is of the rear actuator with it highlighted
The fourth one is of the front actuator with it highlighted.
Yes, those are springs to help them open at the right spot with a modified exhaust.
I hope that helps you
The first picture should be recognizable
The second one (although blurry) is closer to the car
The third one is of the rear actuator with it highlighted
The fourth one is of the front actuator with it highlighted.
Yes, those are springs to help them open at the right spot with a modified exhaust.
I hope that helps you
06-14-07, 10:49 PM
#54
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?
so, from what i've read. the 13b i have has 6 ports. thats 6 intake and 2 exhaust.
does the motor operate on only 4 intake ports and then the last two (5 and 6) open up at a certain speedto increase top speed?? how can i check to see if the actuators are messed up?? or is it a good idea to just take it apart and clean the 5th and 6th ports????
additional info is appreciated.
thanks everyone.
does the motor operate on only 4 intake ports and then the last two (5 and 6) open up at a certain speedto increase top speed?? how can i check to see if the actuators are messed up?? or is it a good idea to just take it apart and clean the 5th and 6th ports????
additional info is appreciated.
thanks everyone.
06-14-07, 11:35 PM
#55
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OK I should have told you more.
The 6-port rotary runs 4 intake ports at low engine speeds(<3500 rpm), this keeps higher intake runner velocity which helps with fuel atomization, swirl and dynamic tuning. At high engine speeds (>3500rpm), these ports open, allowing more cross-sectional area for the engine to breathe through and advancing the intake timing slightly.
On the S4 (series 4, 1986-1988) The auxilliary ports were opened by exhaust back pressure starting at about 3500 rpm and fully open at 4,000 to 4,000 rpm.
(That is why I made my comment about the springs.)
You have an S5 (1989-1991) These ports (looking the same) are open by a solenoid with air from the fresh air pump at about 3500 rpm.
All you have to do to test them is to start the car, open the hood, look down at them and rev the engine while sitting in nuetral. The port actuator pistons should retract into the chambers, rotating the port sleeves and allowing the engine more air.
I apologize for not being more clear in my previous post.
The 6-port rotary runs 4 intake ports at low engine speeds(<3500 rpm), this keeps higher intake runner velocity which helps with fuel atomization, swirl and dynamic tuning. At high engine speeds (>3500rpm), these ports open, allowing more cross-sectional area for the engine to breathe through and advancing the intake timing slightly.
On the S4 (series 4, 1986-1988) The auxilliary ports were opened by exhaust back pressure starting at about 3500 rpm and fully open at 4,000 to 4,000 rpm.
(That is why I made my comment about the springs.)
You have an S5 (1989-1991) These ports (looking the same) are open by a solenoid with air from the fresh air pump at about 3500 rpm.
All you have to do to test them is to start the car, open the hood, look down at them and rev the engine while sitting in nuetral. The port actuator pistons should retract into the chambers, rotating the port sleeves and allowing the engine more air.
I apologize for not being more clear in my previous post.
06-15-07, 12:15 AM
#56
Caramelldansen
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From what I understand the aux ports don't open up when in neutral, only when in gear.
06-15-07, 01:14 AM
#57
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You could be right, I know that they do on my S4, but that is just back pressure, the ECU may not ask them to open unless the car is in gear (which poses a problem for testing them.)
If you don't mind, could you test this really quickly?
Thanks for catching that!
If you don't mind, could you test this really quickly?
Thanks for catching that!
06-15-07, 01:17 AM
#58
Caramelldansen
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Search the forum, that should tell you whether they open in neutral or not.
One way I've heard of testing to see if they open is to put some grease on the actuators, take it for a quick spin and then pop the hood, see if the grease spread or not.
06-15-07, 01:58 AM
#59
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I should have checked Aaron Cake's site.
http://www.aaroncake.net/RX-7/6porttest.htm
The grease will work every time.
http://www.aaroncake.net/RX-7/6porttest.htm
The grease will work every time.
06-16-07, 02:28 PM
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sweet
thank you guys. quick replies and good info. kinda reminds me of my days on honda-tech when I was running my hatch. (lol, i know, ill never go back to 4bangers)
Rob
Rob
06-17-07, 08:06 AM
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I topped out at 135 and I have an 86 gxl. Have you changed the total wheel diameter on your car? this would cause the speedo to be off, if the wheel circumferance is off from stock.
06-17-07, 08:36 AM
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my stock 89 auto non-turbo tops out just under 110 on clean 12 lane highway
and at about 3.5K RPM at that speed it feels like a golf cart heh
and since no one seems to have taken a stab at the massive size change in tires
well DUH. you really think you can go 3" difference on tires w/o causing massive changes to the way the car works. lol!!!!
where were you during middle school filmstrips in science class lmao
and at about 3.5K RPM at that speed it feels like a golf cart heh
and since no one seems to have taken a stab at the massive size change in tires
well DUH. you really think you can go 3" difference on tires w/o causing massive changes to the way the car works. lol!!!!
where were you during middle school filmstrips in science class lmao
) =))
06-25-07, 10:50 PM
#64
Senior Member
I should have checked Aaron Cake's site.
http://www.aaroncake.net/RX-7/6porttest.htm
The grease will work every time.
http://www.aaroncake.net/RX-7/6porttest.htm
The grease will work every time.
P.S I have been having a really hard time starting it the last few days it turns over but it just floods out then I have to un-flood it . Then when I go to start it again I have to hold the pedal down to even get it to start and this is after its only been sitting for a few hours it does this . If it sits over night it starts up fine
Last edited by Toxindude; 06-25-07 at 11:14 PM.
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