blown apex seal on dyno
#2
If I am reading it right it looks like you were way lean for turbo rotary territory. However, there are a lot of other factors involved and with the info you provided no one is going to be able to tell you much.
If the mods in your sig are correct and you were running anything more than 8 psi you obviously have some issues with the setup. The power is very low but I dont know boost pressure.
If the mods in your sig are correct and you were running anything more than 8 psi you obviously have some issues with the setup. The power is very low but I dont know boost pressure.
#3
If I'm reading this correctly, the first pull was around 13. It didn't sound like it was under full throttle.. The second pull looks richer, and I guess those sqiggly lines show when it blew. The last time I had it dyno'd it made 360ish with the cat installed, 400 with a mid-pipe
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#10
the dyno chart is not set up in such a way that you could draw many conclusions from it.
Ask the dyno operators to email your the .drf run files. Then post them up here in a zip file. The .drf files can be read in the Dynojet WinPEP7 software, available for free on the Dynojet website. You also should upload the .dat map files from your Power FC, and any data logs generated during the tuning.
Ask the dyno operators to email your the .drf run files. Then post them up here in a zip file. The .drf files can be read in the Dynojet WinPEP7 software, available for free on the Dynojet website. You also should upload the .dat map files from your Power FC, and any data logs generated during the tuning.
#11
I'll see what I can do. In the meantime, I was told the cause was my Racelogic unit, which cut power to the secondaries, making it go lean. The afr's don't seem to show that, do they? And, Racelogic (who responded almost immediately) says the unit can't cut power to one injector...it cuts power to both.
#12
Original Gangster/Rotary!
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If your sig is accurate, you have a 9 yr old reman in the car correct? Probably three piece seals as well. At levels approaching and over 400 rwhp a slight ping can be all it takes. Sorry to hear.
#15
"It blew with water injection? That's surprising."
Yeah. Back in 2003, I bought the Aquamist unit. As I remember, using their info on how much water to inject, I replaced the Aquamist pump with a Shurflo, added an accumulator, and ran 3 Aquamist jets, 2 post turbo and 1 pre-turbo. The motor got plenty of water.
Don't buy the "bullet-proof" story.
Yeah. Back in 2003, I bought the Aquamist unit. As I remember, using their info on how much water to inject, I replaced the Aquamist pump with a Shurflo, added an accumulator, and ran 3 Aquamist jets, 2 post turbo and 1 pre-turbo. The motor got plenty of water.
Don't buy the "bullet-proof" story.
#20
I'm not convinced the A/F meter signal was displaying correctly, not yet at least. Where was the sensor positioned in the exhaust stream? Did you have an onboard A/F meter? Also, the rpm window shown in the image for post #1 is very narrow which can obscure the big picture.
Did you have the Racelogic hooked to all 4 injectors? It says on their website that it alternates which cylinder it cuts. Well since there are 4 injectors and 2 rotors, I would think that you need to wire each rotor together so that it is, functionally speaking, treated like a 2 cylinder engine. Did you or whoever installed it talk to Racelogic for a while before you set it up? There are enough settings here that something could have gone wrong.
Did you have the Racelogic hooked to all 4 injectors? It says on their website that it alternates which cylinder it cuts. Well since there are 4 injectors and 2 rotors, I would think that you need to wire each rotor together so that it is, functionally speaking, treated like a 2 cylinder engine. Did you or whoever installed it talk to Racelogic for a while before you set it up? There are enough settings here that something could have gone wrong.
#21
"Where was the sensor positioned in the exhaust stream?"
He uses a sensor stuck in the exhaust pipe. I have a gauge on the dash. (I forget whose, but it's a good one. The sensor is in the exhaust manifold.)
"Did you or whoever installed it talk to Racelogic for a while before you set it up"
The same shop installed the Racelogic. There was concern over how it worked, but he was satisfied that their system couldn't result in a lean condition. My understanding was it cut both the primaries AND the secondaries.
Nevertheless, the dyno a/f readings don't show a sudden change.
Actually, I was told there was continuity from the Racelogic to the injectors, and continuity from the Apexi to the Racelogic, but no continuity across the Racelogic processor. Racelogic says the primaries wouldn't work under that scenario.
I drove the car for a couple of miles, no boost, before it went on the dyno. It ran perfectly.
He uses a sensor stuck in the exhaust pipe. I have a gauge on the dash. (I forget whose, but it's a good one. The sensor is in the exhaust manifold.)
"Did you or whoever installed it talk to Racelogic for a while before you set it up"
The same shop installed the Racelogic. There was concern over how it worked, but he was satisfied that their system couldn't result in a lean condition. My understanding was it cut both the primaries AND the secondaries.
Nevertheless, the dyno a/f readings don't show a sudden change.
Actually, I was told there was continuity from the Racelogic to the injectors, and continuity from the Apexi to the Racelogic, but no continuity across the Racelogic processor. Racelogic says the primaries wouldn't work under that scenario.
I drove the car for a couple of miles, no boost, before it went on the dyno. It ran perfectly.
#22
"Did you or whoever installed it talk to Racelogic for a while before you set it up"
The same shop installed the Racelogic. There was concern over how it worked, but he was satisfied that their system couldn't result in a lean condition. My understanding was it cut both the primaries AND the secondaries.
The same shop installed the Racelogic. There was concern over how it worked, but he was satisfied that their system couldn't result in a lean condition. My understanding was it cut both the primaries AND the secondaries.
Nevertheless, the dyno a/f readings don't show a sudden change.
Actually, I was told there was continuity from the Racelogic to the injectors, and continuity from the Apexi to the Racelogic,
![](https://www.rx7club.com/attachments/3rd-generation-specific-1993-2002-16/444625d1318298888-blown-apex-seal-dyno-racelogic_install.png)
See any potential problems here?
but no continuity across the Racelogic processor.
Racelogic says the primaries wouldn't work under that scenario.
![](https://www.rx7club.com/attachments/3rd-generation-specific-1993-2002-16/444626d1318298888-blown-apex-seal-dyno-racelogic_install2.png)
![](https://www.rx7club.com/attachments/3rd-generation-specific-1993-2002-16/444627d1318298888-blown-apex-seal-dyno-racelogic_cut.png)
But here's the deal: with a 2 rotor engine running staged injection, if you randomly cut 1 injector you are not going to fuel cut a whole rotor. You are going to cut a random primary or secondary injector depending on how they have the thing wired up and how they have the software configured. See those little x's above? Those are the random injectors being cut if the system was essentially configured like a regular old Honda 4 cylinder.
I drove the car for a couple of miles, no boost, before it went on the dyno. It ran perfectly.
Anyway, this is all speculation. Now you need to hook the laptop up to your Racelogic and see what settings they have configured it for. I doubt they were doing any logging during the dyno runs so honestly we'll probably never know for sure if the traction control intervened and did anything. I'm skeptical that this shop understands the peculiarities of sequential fuel injection on a rotary engine and then accounted for it in their configuration of this traction control system.
IMO aftermarket traction control systems are extremely primitive and not worth it. The traction/stability system on a 7-8 year old Rx-8 is 20 years ahead of this box you bought. If you want traction control buy a car that was already engineered for it. I could go on and on about the differences between this box and an OEM system.