3900K Boost Stops
#1
In Atlanta? Hit me up.
Thread Starter
3900K Boost Stops
My Rex boosts nice and quick but as soon as I hit 3800-3900 it feels like I hit a wall and the powers gone. I can keep revving but it doesn't feel like im going any faster.
I did just install new injects and put on block off plates and have been fighting an overheating issue for some time now.
Any ideas?
I did just install new injects and put on block off plates and have been fighting an overheating issue for some time now.
Any ideas?
#3
Disco Biscuit
iTrader: (9)
Do you have an aftermarket boost gauge?
boost controller (manual, electronic, etc.)?
Do you know what you are boosting at?
Do you have a FCD?
What are you using to control your fuel? It sounds like you are going really rich when your upgraded injectors are coming online.
boost controller (manual, electronic, etc.)?
Do you know what you are boosting at?
Do you have a FCD?
What are you using to control your fuel? It sounds like you are going really rich when your upgraded injectors are coming online.
#4
In Atlanta? Hit me up.
Thread Starter
No I'm sorry, I should have explained it better. You can feel the car really pick up momentum until about 3900 rpm then it feels like you just hit resistance. It doesn't feel like its producing much power. Maybe I should video tape it.
No I don't have anything else besides whats listened on my signature bellow.
No I don't have anything else besides whats listened on my signature bellow.
#7
Engine, Not Motor
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Check your grounds: http://www.aaroncake.net/rx-7/grounding.htm
Also, how much boost is the car producing when it cuts out? You may be hitting fuel cut.
Also, how much boost is the car producing when it cuts out? You may be hitting fuel cut.
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#9
Disco Biscuit
iTrader: (9)
Considering that your secondaries kick on around 3800 rpm with the stock ecu. I would suspect that is your problem. The stock ecu is programmed for 550cc injectors, not 800cc injectors, so I'd say you're super rich when they come online.
I'm not 100% positive, but I would say that you are in need of a rtek upgrade, or some type of fuel controller. A wideband and an aftermarket boost guage would also be recommended.
I'm fairly sure you would know if you hit fuel cut from over boosting. It really feels like you hit something with your car. I hit it once while adjusting my manual boost controller, and immediately found out why it's referred to as "hitting a wall".
I'm not 100% positive, but I would say that you are in need of a rtek upgrade, or some type of fuel controller. A wideband and an aftermarket boost guage would also be recommended.
I'm fairly sure you would know if you hit fuel cut from over boosting. It really feels like you hit something with your car. I hit it once while adjusting my manual boost controller, and immediately found out why it's referred to as "hitting a wall".
#10
Senior Member
iTrader: (3)
Considering that your secondaries kick on around 3800 rpm with the stock ecu. I would suspect that is your problem. The stock ecu is programmed for 550cc injectors, not 800cc injectors, so I'd say you're super rich when they come online.
I'm not 100% positive, but I would say that you are in need of a rtek upgrade, or some type of fuel controller. A wideband and an aftermarket boost guage would also be recommended.
I'm fairly sure you would know if you hit fuel cut from over boosting. It really feels like you hit something with your car. I hit it once while adjusting my manual boost controller, and immediately found out why it's referred to as "hitting a wall".
I'm not 100% positive, but I would say that you are in need of a rtek upgrade, or some type of fuel controller. A wideband and an aftermarket boost guage would also be recommended.
I'm fairly sure you would know if you hit fuel cut from over boosting. It really feels like you hit something with your car. I hit it once while adjusting my manual boost controller, and immediately found out why it's referred to as "hitting a wall".
A video might be beneficial.
#12
In Atlanta? Hit me up.
Thread Starter
I'm just not sure as I have never hit the fuel cut before. But do you guys think I could actually create enough boost at 3900 to actually create a fuel cut situation? I thought the turbos don't even start boosting until 2700.
Your very right thought I do need a real boost gauge, it would shed a lot of light on the situation. Moneys just tight but I'll see what I can come up with real quick.
Your very right thought I do need a real boost gauge, it would shed a lot of light on the situation. Moneys just tight but I'll see what I can come up with real quick.
#13
In Atlanta? Hit me up.
Thread Starter
Sorry lunch I didn't see your question. I'm sure they are but I never checked with an meter so I'll get on that too. Actually I have the box so I could call the company real quick.
#19
Sharp Claws
iTrader: (30)
fuel cut or a severely clogged cat.
when my cat was dying it gave similar symptoms like it would hit a brick wall half through the RPM range, the cat will make a loud hissing sound under the car if it is failing and the tailpipes will be a bit on the quiet side(the engine will also run hotter against the backpressure), if you don't have a cat that refer to #1.
when my cat was dying it gave similar symptoms like it would hit a brick wall half through the RPM range, the cat will make a loud hissing sound under the car if it is failing and the tailpipes will be a bit on the quiet side(the engine will also run hotter against the backpressure), if you don't have a cat that refer to #1.
#22
In Atlanta? Hit me up.
Thread Starter
I drove it today for about 30 minutes. I really think you guys are right. Its the fuel cut off. I can rev it slowly past the point no problem.
Worst part is the overheating. I'm not even running a thermostat and my RX7 has this special feature of turning water into chocolate milk. I think my water jacket is clogged up with garbage. I keep flushing it and it keeps turning it brown.
Worst part is the overheating. I'm not even running a thermostat and my RX7 has this special feature of turning water into chocolate milk. I think my water jacket is clogged up with garbage. I keep flushing it and it keeps turning it brown.
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