Help!
08-22-09, 02:18 PM
#26
did you ever get to the bottom of these issues?
You mentioned in a previous post you purchased 720cc injectors? How are they being controlled? Adding that much more fuel without anyway to control it would surely cause a "bogging" issue. I'd like to give rx-7 specialties the benefit of the doubt here, i can't imagine they would throw 30% larger injectors in without some sort of control? At least i'd hope not.
Now that i think of it why did you even need larger injectors? Are you running higher than stock boost? To be honest i would throw the stock injectors back in, i don't know what injectors they used but they may have had to throw resistors in, which can cause issues if not done properly, hell it can cause issues sometimes when it's done right. That should solve the "bogging" issue. It may solve the electrical one as well. But just in case i would redo all the grounds with nice new cables. I don't know much about the s5 cars but my s4 had a few small grounds by the back firewall that attached to the bellhousing near the slave cylinder.
Let us know.
You mentioned in a previous post you purchased 720cc injectors? How are they being controlled? Adding that much more fuel without anyway to control it would surely cause a "bogging" issue. I'd like to give rx-7 specialties the benefit of the doubt here, i can't imagine they would throw 30% larger injectors in without some sort of control? At least i'd hope not.
Now that i think of it why did you even need larger injectors? Are you running higher than stock boost? To be honest i would throw the stock injectors back in, i don't know what injectors they used but they may have had to throw resistors in, which can cause issues if not done properly, hell it can cause issues sometimes when it's done right. That should solve the "bogging" issue. It may solve the electrical one as well. But just in case i would redo all the grounds with nice new cables. I don't know much about the s5 cars but my s4 had a few small grounds by the back firewall that attached to the bellhousing near the slave cylinder.
Let us know.
08-24-09, 12:13 PM
#27
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Did you ever get to the bottom of these issues?
You mentioned in a previous post you purchased 720cc injectors? How are they being controlled? Adding that much more fuel without anyway to control it would surely cause a "bogging" issue. I'd like to give RX-7 Specialties the benefit of the doubt here, I can't imagine they would throw 30% larger injectors in without some sort of control? At least I'd hope not.
Now that I think of it why did you even need larger injectors? Are you running higher than stock boost? To be honest I would throw the stock injectors back in, I don't know what injectors they used but they may have had to throw resistors in, which can cause issues if not done properly, hell it can cause issues sometimes when it's done right. That should solve the "bogging" issue. It may solve the electrical one as well. But just in case I would redo all the grounds with nice new cables. I don't know much about the S5 cars but my S4 had a few small grounds by the back firewall that attached to the bellhousing near the slave cylinder.
Let us know.
You mentioned in a previous post you purchased 720cc injectors? How are they being controlled? Adding that much more fuel without anyway to control it would surely cause a "bogging" issue. I'd like to give RX-7 Specialties the benefit of the doubt here, I can't imagine they would throw 30% larger injectors in without some sort of control? At least I'd hope not.
Now that I think of it why did you even need larger injectors? Are you running higher than stock boost? To be honest I would throw the stock injectors back in, I don't know what injectors they used but they may have had to throw resistors in, which can cause issues if not done properly, hell it can cause issues sometimes when it's done right. That should solve the "bogging" issue. It may solve the electrical one as well. But just in case I would redo all the grounds with nice new cables. I don't know much about the S5 cars but my S4 had a few small grounds by the back firewall that attached to the bellhousing near the slave cylinder.
Let us know.
Once i gave them the car to put the engine in, they found that my fuel pump was not getting the necessary amount of volts. So they wired up a fuel pump switch, and told me that should fix the fuel pump volt problem. So im guessing the 720's are not necessary now.
About the "bogging" i was just looking around and stuff and i found that the intercooler was out of the elbow coming from the intake manifold. i tried put it in but it gave me such a hard time, the after like 30 min i felt like taking the elbow and twist the ends around, and theintercooler just slid right in place, so that fix the bogging issue i think, it did not spotter at 5000 rpm anymore.
So i think its ok
About the electrical problem i had Andrew a guy here from the forum came and gave me a hand, the car was running of the alternator for 15 min and the it would turn off so it was weird it was like the alternator wasn't gettingthe current after 15 minutes so we checked and it was just fine, i ended up getting an FD alternator and the car works just fine, It hasn't died on me yet (knock on wood) and it runs fine, I've put around 100 Kms ont he new engine just at low RMP and it feels nice.
08-24-09, 02:07 PM
#28
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I Believe there was a fault in the alternator that when it reached a high enough temperature it would stop producing any amps. and then it would continue to run off the battery until it was dead.
Did you get the 550s back in OscarA?
Did you get the 550s back in OscarA?
08-24-09, 05:27 PM
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Sweet good to hear!
When it comes to the injectors, the stock injectors are more than enough for stock boost levels. Now if your fuel pump wasnt getting full voltage that might be a possible cause for the blown motor. Either way throwing larger injectors at the problem is kind of like replacing your garden hose with a fire hose in an attempt to get more water flow out of a well with a burnt out pump. It sounds to me more like someone saw an oppurtunity to sell some injectors
And to do so with no additional injector control? That whole senario is aggrivating. What needs to be asked is why the rear rotor blew. Fuel pump could be a culprit, poor coolant flow to rear rotor, locked clogged injector, not running proper octane fuel, clogged fuel filter, etc etc.
That aside. Now that you have the "bog" figured out and the alternator issues solved, keeping those bigger injectors in is ok provided you use a controller of some kind. If you have no use for a fuel controller then I would go back to stock injectors and run stock boost. Just make sure all your ducks are in a row regarding the issues that I stated above.
When it comes to the injectors, the stock injectors are more than enough for stock boost levels. Now if your fuel pump wasnt getting full voltage that might be a possible cause for the blown motor. Either way throwing larger injectors at the problem is kind of like replacing your garden hose with a fire hose in an attempt to get more water flow out of a well with a burnt out pump. It sounds to me more like someone saw an oppurtunity to sell some injectors
And to do so with no additional injector control? That whole senario is aggrivating. What needs to be asked is why the rear rotor blew. Fuel pump could be a culprit, poor coolant flow to rear rotor, locked clogged injector, not running proper octane fuel, clogged fuel filter, etc etc. That aside. Now that you have the "bog" figured out and the alternator issues solved, keeping those bigger injectors in is ok provided you use a controller of some kind. If you have no use for a fuel controller then I would go back to stock injectors and run stock boost. Just make sure all your ducks are in a row regarding the issues that I stated above.
08-24-09, 11:25 PM
#30
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in the injector sellers defence. the RHD model doesn't have a cat. so perhaps the seller with thinking is was running higher then normal boost.
when i eliminated my cat. 680cc injectors and a fd fuel pump worked perfectly without any fuel control.
when i eliminated my cat. 680cc injectors and a fd fuel pump worked perfectly without any fuel control.
08-25-09, 05:42 PM
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Your telling me that by some great form of "magic" and "luck" 680cc injectors and an FD fuel pump adds the precise amount of additional fuel required when running without a cat? I find that a little hard to believe. Do you have any datalogs with a wideband to stand behind the claim it worked "perfectly"? I would suggest it worked less than perfect. Now those mods in conjuntion with a fuel controller, dyno time, and a wideband, and yes it would be a great setup and make optimal power. You can't just toss in larger injectors and a high flow pump and "hope for the best" It doesnt work that way. Never has never will.
You and I both know selling larger injectors without anyway of controlling them is a bad idea. Anyone that disagrees must live on another planet.
08-25-09, 06:58 PM
#32
I run a wideband on my supercharged 13b, carbed. And I can tell you I notice a difference in the "feel" relevant to the air fuel readings I get. I had a narrowband years ago, useless! I think anyone going beyond stock, even just changing injectors, is foolish if they do not run a wideband to see what is happening. Perhaps the increased fuel flow combined with bigger injectors and a increase in boost level from reduced exhaust restriction may be a great combination. After a popping more than one engine, I do not leave things like this to chance or seat of the pants any longer!
08-25-09, 07:59 PM
#33
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agreed i ran with the narrow band before.
yes just by luck the racing beat full exhaust, racing beat FCD, 680cc secondaries and an FD pump worked great. maybe a little less then perfect, but with no hesitation, detonation or pinging, the all i can tell you is that the AFR were anywhere between too rich and too lean.
would i suggest it to anyone now? not a chance. i'm just saying small air flow mods and small fuel mods aren't usually way out of spec. it's just a band-aid fix instead of the proper solution.
yes just by luck the racing beat full exhaust, racing beat FCD, 680cc secondaries and an FD pump worked great. maybe a little less then perfect, but with no hesitation, detonation or pinging, the all i can tell you is that the AFR were anywhere between too rich and too lean.
would i suggest it to anyone now? not a chance. i'm just saying small air flow mods and small fuel mods aren't usually way out of spec. it's just a band-aid fix instead of the proper solution.
08-25-09, 08:38 PM
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I run a wideband on my supercharged 13b, carbed. And I can tell you I notice a difference in the "feel" relevant to the air fuel readings I get. I had a narrowband years ago, useless! I think anyone going beyond stock, even just changing injectors, is foolish if they do not run a wideband to see what is happening. Perhaps the increased fuel flow combined with bigger injectors and a increase in boost level from reduced exhaust restriction may be a great combination. After a popping more than one engine, I do not leave things like this to chance or seat of the pants any longer!
Most people will spout off about all kinds of nonsense, then when they actually run with a wideband they STFU in short order.
Syritis. Small fuel mods? 720cc injectors is a 30% increase in injector, hardly what I would consider small. No? And if you, someone with some experience would not recomend it to people, and in your own words it's a band aid fix, why on earth would a "reputable" shop do it? I'm not mentioning the shop cause I don't want a fight or this thread to get closed. It's just really really aggrivating. It's the way things were done 10-15 years ago, it's a hack job, and a screw you to the customer. These types of practises are a large part of the reason rotarys have such a bad rap in North America.
It makes me livid.
08-25-09, 10:17 PM
#35
LOL, we agree on another point too, right sized BB turbo and a good standalone and I could double my power. Now for where you won't agree...the experiment next year: Blow through carb & supercharger with a holset and custom exhaust manifold, intercooler, maintain the methanol and use a locked distributor.
08-26-09, 02:31 PM
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I have no problem with experimentation. Some things are tried, tested, and true and that's great but there is always room for new ideas. Your not spending my money so experiment away. Even if I do poo poo all over it and pull out the "I told you so" at the end. lol!