Not Reving to Redline???
#26
Boost in..Apex seals out.
Join Date: Nov 2003
Location: Maryland, 21794
Posts: 1,931
Likes: 0
Received 0 Likes
on
0 Posts
Well if the 5/6th ports are wired open, it would be revving higher in the upper RPM then down low. Seems kinda strange. Nothing to do with trans if it did it in neutral as well...have him make sure the ports are correctly wired open.
#27
S4 is sexay!
Join Date: Jun 2004
Location: East Central MN
Posts: 326
Likes: 0
Received 0 Likes
on
0 Posts
On an S5, the port actuators should be fully pushed out if I remember correctly, maybe he got confused with the S4 and wired them shut?
Keep in mind that the actuators are supposed to open at around 3500-4000 RPM. When my car's 5th/6th port actuation system wasn't working I had no trouble redlining it in neutral. My vote is still on VDI or something else.
Keep in mind that the actuators are supposed to open at around 3500-4000 RPM. When my car's 5th/6th port actuation system wasn't working I had no trouble redlining it in neutral. My vote is still on VDI or something else.
#28
Junior Member
Thread Starter
Join Date: Apr 2005
Location: P.A.
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Turbo7MN
I had no trouble redlining it in neutral. My vote is still on VDI or something else.
#29
Former Moderator. RIP Icemark.
Originally Posted by fast90rx7
If you had no trouble redlining in neutral why do you still think it is something with VDI?? And you also said that they open up at 3500-4000 rpm.. Why is this car having trouble at 6000 rpm? Just a thought but maybe the 5/6th ports are not all the way open?? Maybe only half way?
But the Aux ports and VDI are two different things.
Think of the aux ports (or sometimes called 5th/6th ports) as extra valves opening on a DOHC piston engine (like your SHO), and VDI as different cam shaft timing (like a VTEC honda or Toyota VVVTC sort of). As you learn more about rotary engines, you will also see the aux port change intake time as well, but that is another story and I didn't really want to mention it as it sounds like you are already way confused on operation.
Two radically different things.
To me it sounds like a couple of things.
#1 no air pump. This pretty much kills the engine. The Aux ports won't work, the VDI won't work. Wiring them both open kills the low end power (everything under 4K RPM is gone making it a true dog). Leaving them closed will limit the high end rev to about 5500-6000 RPM.
#2 the walbro. If it is one for the Turbo (as most inexperienced non turbo tuners will put in) then there is radically too much gas at above 5K making it run like a rich pig and further lowing engine output. The absolute last thing you want on a non turbo is more gas above 5K RPM. They are all ready pig rich at that RPM.
#3 the tranny... using a Turbo tranny just adds extra weight that is not needed, but will have 0 effect on the way the engine runs. Gearing is almost close enough to be considered identical to a non turbo.
#4 spark plugs ... if the condition of the spark plugs or spark plug wiring is poor; then that too will limit the upper range RPM.
edit: FYI VDI:
A rotary valve between the intake tracks which opens at 5200 RPM. This variable dynamic intake (VDI) valve enhanced the DEI (Dynamic Effect Intake) by altering the length of the fuel/air mixture path based on engine speed and load.
Last edited by Icemark; 06-22-05 at 10:19 PM.
#30
Rotary Freak
I once parked my Vert for around 5 months while I drove my new FD almost constantly.
When I started driving the vert again, it had a lot of trouble getting to redline. When it started running bad, I would always back out out the gas.
After a while, I decided to 'push through' to see what would happen. So, getting onto the freeway, I would rev the **** out of it. When it started to slow, I would just keep my foot in it.
After a few trips past 5K it was back to normal. I've always been told by service dept. people that the engine needs to redline every once in a while.
When I started driving the vert again, it had a lot of trouble getting to redline. When it started running bad, I would always back out out the gas.
After a while, I decided to 'push through' to see what would happen. So, getting onto the freeway, I would rev the **** out of it. When it started to slow, I would just keep my foot in it.
After a few trips past 5K it was back to normal. I've always been told by service dept. people that the engine needs to redline every once in a while.
#31
ERTW
iTrader: (1)
Join Date: Oct 2002
Location: Ottawa, Canada
Posts: 4,328
Likes: 0
Received 0 Likes
on
0 Posts
i have driven around with 6pi and VDI not operational and i can still rev to redline.
icemark mentioned it about the fuel and spark, and i have to say it is most likely to be a fuel/spark problem.
it could be the engine getting too rich, but i think either the spark plugs or the coils may not be working properly, causing ignition break up at the upper RPM range. so check 2 things:
- spark plugs
- ignition coils
icemark mentioned it about the fuel and spark, and i have to say it is most likely to be a fuel/spark problem.
it could be the engine getting too rich, but i think either the spark plugs or the coils may not be working properly, causing ignition break up at the upper RPM range. so check 2 things:
- spark plugs
- ignition coils
#32
Junior Member
Thread Starter
Join Date: Apr 2005
Location: P.A.
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Icemark
VDI and aux ports only work under load.
But the Aux ports and VDI are two different things.
Think of the aux ports (or sometimes called 5th/6th ports) as extra valves opening on a DOHC piston engine (like your SHO), and VDI as different cam shaft timing (like a VTEC honda or Toyota VVVTC sort of). As you learn more about rotary engines, you will also see the aux port change intake time as well, but that is another story and I didn't really want to mention it as it sounds like you are already way confused on operation.
Two radically different things.
To me it sounds like a couple of things.
#1 no air pump. This pretty much kills the engine. The Aux ports won't work, the VDI won't work. Wiring them both open kills the low end power (everything under 4K RPM is gone making it a true dog). Leaving them closed will limit the high end rev to about 5500-6000 RPM.
#2 the walbro. If it is one for the Turbo (as most inexperienced non turbo tuners will put in) then there is radically too much gas at above 5K making it run like a rich pig and further lowing engine output. The absolute last thing you want on a non turbo is more gas above 5K RPM. They are all ready pig rich at that RPM.
#3 the tranny... using a Turbo tranny just adds extra weight that is not needed, but will have 0 effect on the way the engine runs. Gearing is almost close enough to be considered identical to a non turbo.
#4 spark plugs ... if the condition of the spark plugs or spark plug wiring is poor; then that too will limit the upper range RPM.
edit: FYI VDI:
FYI: Aux ports= a single port in each rotor that opens around 3800-3850 on non turbo 13B '84-'91 models, that allows both intake timing and amount to change when the engine is under load.
But the Aux ports and VDI are two different things.
Think of the aux ports (or sometimes called 5th/6th ports) as extra valves opening on a DOHC piston engine (like your SHO), and VDI as different cam shaft timing (like a VTEC honda or Toyota VVVTC sort of). As you learn more about rotary engines, you will also see the aux port change intake time as well, but that is another story and I didn't really want to mention it as it sounds like you are already way confused on operation.
Two radically different things.
To me it sounds like a couple of things.
#1 no air pump. This pretty much kills the engine. The Aux ports won't work, the VDI won't work. Wiring them both open kills the low end power (everything under 4K RPM is gone making it a true dog). Leaving them closed will limit the high end rev to about 5500-6000 RPM.
#2 the walbro. If it is one for the Turbo (as most inexperienced non turbo tuners will put in) then there is radically too much gas at above 5K making it run like a rich pig and further lowing engine output. The absolute last thing you want on a non turbo is more gas above 5K RPM. They are all ready pig rich at that RPM.
#3 the tranny... using a Turbo tranny just adds extra weight that is not needed, but will have 0 effect on the way the engine runs. Gearing is almost close enough to be considered identical to a non turbo.
#4 spark plugs ... if the condition of the spark plugs or spark plug wiring is poor; then that too will limit the upper range RPM.
edit: FYI VDI:
FYI: Aux ports= a single port in each rotor that opens around 3800-3850 on non turbo 13B '84-'91 models, that allows both intake timing and amount to change when the engine is under load.
Thanks for all your help everyone!!
#33
S4 is sexay!
Join Date: Jun 2004
Location: East Central MN
Posts: 326
Likes: 0
Received 0 Likes
on
0 Posts
I wouldn't bother putting the airpump back in, just run the 5th/6th ports and VDI off an electric airpump and RPM switch. It'll save weight and engine bay space, and it will open at the same RPM every time no matter what. People wire the ports open because they are ignorant (no offense) and probably too lazy to do it the correct way. If you don't push your car into the high RPM's all the time, you're probably better off just leaving them shut. I spent about a year with stuck 5th/6th ports and the car was still just fine for everyday driving. Wiring the ports open is a pretty stupid idea in my opinion.
Your best shot is probably the fuel pump.
-Darren
Your best shot is probably the fuel pump.
-Darren
#35
Junior Member
Thread Starter
Join Date: Apr 2005
Location: P.A.
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Turbo7MN
I wouldn't bother putting the airpump back in, just run the 5th/6th ports and VDI off an electric airpump and RPM switch. It'll save weight and engine bay space, and it will open at the same RPM every time no matter what. People wire the ports open because they are ignorant (no offense) and probably too lazy to do it the correct way. If you don't push your car into the high RPM's all the time, you're probably better off just leaving them shut. I spent about a year with stuck 5th/6th ports and the car was still just fine for everyday driving. Wiring the ports open is a pretty stupid idea in my opinion.
Your best shot is probably the fuel pump.
-Darren
Your best shot is probably the fuel pump.
-Darren
#36
S4 is sexay!
Join Date: Jun 2004
Location: East Central MN
Posts: 326
Likes: 0
Received 0 Likes
on
0 Posts
It blows air. Seriously. It's main purpose is to blow air into the exhaust system for emissions reasons, but on S5's it also operates the 5th/6th ports and VDI. If you want a diagram, look up the FSM.
http://www.teamfc3s.org/main/factory...ual/1989_1991/
It should be in section 4A
http://www.teamfc3s.org/main/factory...ual/1989_1991/
It should be in section 4A
#37
Junior Member
Thread Starter
Join Date: Apr 2005
Location: P.A.
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
I talked to the owner again, and he said that the old owner (that was his friend) had the same revving problem that it has now. I asked him if it had the fuel pump in it that is has now. He said yes. So im almost positive that it is the fuel pump causing the problem. Now do I have to put in a stock fuel pump, or can I just put in a pressure regulator to big the pressure down?
#38
S4 is sexay!
Join Date: Jun 2004
Location: East Central MN
Posts: 326
Likes: 0
Received 0 Likes
on
0 Posts
I'd put in a stock one first, just because they are cheap and common and you should be able to tell right away. I have a spare one laying around my garage, but I have no idea if it works. Ideally, you should get a Walbro that is designed for the N/A.
#39
Junior Member
Thread Starter
Join Date: Apr 2005
Location: P.A.
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Well once I learn more about rx's and stuff, I think im gona buy a TII motor with a blown Apex seal. I also happen to know someone with one. And ill get it rebuilt with 3mm apex seals, and do some kind of P&P. Im not sure how big yet. But anyway ill do that and put in the motor, ECU, Harness, ect. So that is why I want to keep the pump in if possible. I mean worse comes to worse, ill just throw in a stock pump and just keep the walbro until I turbo it.
#40
Former Moderator. RIP Icemark.
Originally Posted by fast90rx7
Well once I learn more about rx's and stuff, I think im gona buy a TII motor with a blown Apex seal. I also happen to know someone with one. And ill get it rebuilt with 3mm apex seals, and do some kind of P&P. Im not sure how big yet. But anyway ill do that and put in the motor, ECU, Harness, ect. So that is why I want to keep the pump in if possible. I mean worse comes to worse, ill just throw in a stock pump and just keep the walbro until I turbo it.
You may wish to find something that is not blown and just has high miles or try a crap shoot like a Jspec for rebuilding.
#41
Junior Member
Thread Starter
Join Date: Apr 2005
Location: P.A.
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
well I have a friend who bought a motor for his Gen II. He got the motor and put it in his car. When he started it, it blew alot of oil. So he told the company that he bought it from, which was one of those Jap inporters. And they are giving him a Gen III TT motor in place of the old one. So I was just thinking about getting the old one. What would be the problem with this?
Thread
Thread Starter
Forum
Replies
Last Post
Shainiac
Single Turbo RX-7's
12
07-17-19 02:20 PM