My A-Spec 500R Kit Dyno Charts

[TurboSquirrel]

Originally Posted by DamnitzRoger

wow thats awesome! i'm actually planning on buying the same kit, but their "500r-sp" kit instead.

Yeah, I am assuming that's what I have as well, if you look at that pic above of the number plate on the turbo they call it 500RSP. Do you know what the difference is between this and the regular 500R kit?

- Kevin

[DamnitzRoger]

Originally Posted by TurboSquirrel

Yeah, I am assuming that's what I have as well, if you look at that pic above of the number plate on the turbo they call it 500RSP. Do you know what the difference is between this and the regular 500R kit?

- Kevin

Originally Posted by Zero R

The newer ones use larger turbines with custom profiles machined to suit the specific housing. This allows for better more specific applications. They fit better, meaning they have more room around the CHRA to work with than the older models. They are proving to perform better as well in testing. The SP runs a .84 turbine housing, it spools quicker than the older 1.0 or 1.06 obviously however due to the specific wheel profiles the new .84 SP is showing more flow up to top than the old 1.06 A/r So your getting quicker response down low and more flow up top. Sounds like a good move in the right direction to me. The HP models will be able to outperform your standard 1.0 TO4Z as that was the goal in mind for that version and will be geared more towards high hp street/highway type car.

If it were me I would say a SP is about as good as it gets. Great response with the capability of going over 500whp. and honestly anyone who has been in a 500whp FD can tell you. It is more than adaquate for anything short of bragging rights.

I'll check the links and GOOD FOR YOU!! Another track proven a-spec powered FD.

got if from their section on rx7club.com

[cewrx7r1]

The boost curve is sloppy like your EBC is not functioning too well or not properly hooked up. It spikes and then drops off erraticaly.

Mine did that when I first hooked it up. Then I tried hooking my EBC differently than the manual showed. If you use the turbo outlet as your boost source for both the WG and EBC, then it senses a higher base pressure than the controlled pressure source. This is caused by the pressure drop in the IC.

I take my pressure source from my Greddy TB elbow and that "Ts" into the WG side and WG solenoid input. The IC also acts like a filter to smooth out fluctuations.

This made a great improvement in my boost control. You might also need to experiment with the GAIN to obtain the quickest spoolup that does not either cause spiking or boost start to increase.

You max HP was produced at 15 psi boost. Thus if it stayed at 16psi, you would have made maybe another 15 HP.
"Ray said I was making about 15HP / pound of boost."

[TurboSquirrel]

Originally Posted by cewrx7r1

The boost curve is sloppy like your EBC is not functioning too well or not properly hooked up. It spikes and then drops off erraticaly.

Mine did that when I first hooked it up. Then I tried hooking my EBC differently than the manual showed. If you use the turbo outlet as your boost source for both the WG and EBC, then it senses a higher base pressure than the controlled pressure source. This is caused by the pressure drop in the IC.

I take my pressure source from my Greddy TB elbow and that "Ts" into the WG side and WG solenoid input. The IC also acts like a filter to smooth out fluctuations.

This made a great improvement in my boost control. You might also need to experiment with the GAIN to obtain the quickest spoolup that does not either cause spiking or boost start to increase.

You max HP was produced at 15 psi boost. Thus if it stayed at 16psi, you would have made maybe another 15 HP.
"Ray said I was making about 15HP / pound of boost."

Thanks Chuck, your guide has been invaluable to me learning this stuff and helping tune my idle / cruise! I'll see how adjusting the gain helps spoolup.

Quicker spoolup is my main goal.

I'm using an old Profec-B with the solenoid pressure sourced from the UIM. The "OUT" side of the EBC solenoid goes to the top of the WG, and the side of the WG is being sourced near the Compressor before the intercooler.

Previously, I had the side of the WG pressure source coming from the UIM and I would get boost creep consistently. Have not seen any creep since sourcing from the compressor.

Thanks

- Kevin

[dregg100]

Originally Posted by TurboSquirrel

Thanks Chuck, your guide has been invaluable to me learning this stuff and helping tune my idle / cruise! I'll see how adjusting the gain helps spoolup.

Quicker spoolup is my main goal.

I'm using an old Profec-B with the solenoid pressure sourced from the UIM. The "OUT" side of the EBC solenoid goes to the top of the WG, and the side of the WG is being sourced near the Compressor before the intercooler.

Previously, I had the side of the WG pressure source coming from the UIM and I would get boost creep consistently. Have not seen any creep since sourcing from the compressor.

Thanks

- Kevin

get rid of the pressure source from the intake manifold. run pressure from the compressor housing to the "in" on the profec and run the "out" to the side port on the wastegate and leave the other port open(could be the other way around for the the wastegate, i cant ever remember)that could be part of your problem, but damn, that is absolutely horrible for response. when i had my regular 35r on a stock port engine with the 1.06 housing i was seeing 18 psi by~3800. the 500r just has a differend comp wheel if im not mistaken. that just seems really odd, especially for a ported motor.

have you checked all your intercooler piping for leaks? intake gaskets?

:edit: just read the above post copied from the other forum. the sp has a different hotside, but is getting better response than the standard 500r according to sean. so you should be hitting 15psi under 4k no problem.

[David Jerome]

I spoke to another owner of this kit and he is claiming actually slightly worse response in 3rd and 4th gear but marginally better response in 1st and 2nd? His car made around the same power at the same boost level, within about 10rwhp.

I havent seen many if any other dyno graphs or reports about this turbo. At this point I am lost on what is causing the slow response. Hopefully adjusting the Profec B will help dramatically. We will see I guess.

Kevin, I know the wastegate spring is 13lbs, when you had it running directly off the spring bypassing the Profec was response really any better or have you tried this since have it tuned?

[David Jerome]

Originally Posted by cewrx7r1

The boost curve is sloppy like your EBC is not functioning too well or not properly hooked up. It spikes and then drops off erraticaly.

."

It is hard to see in the graph that Kevin posted but the boost actually only fluctuates less than 1psi between 5100-7500 rpms. Only flucuated about .5psi from 5500-7500rpms.

[TurboSquirrel]

Originally Posted by dregg100

get rid of the pressure source from the intake manifold. run pressure from the compressor housing to the "in" on the profec and run the "out" to the side port on the wastegate and leave the other port open(could be the other way around for the the wastegate, i cant ever remember)that could be part of your problem

dregg100 I had the EBC hooked up that way once before (inline between the pressure source and the side of the WG with top open to atm) and it would never allow the WG to open (as if the WG was never seeing pressure). DIP switches set to external WG option btw.

Just to be clear, here's how I have it setup currently:

- a line from Compressor to the side of the WG
- a line from the (OUT) port on the solenoid to the top of the WG
- a line from the UIM to the (IN) port on the solenoid
- a line from the UIM to the Profec-B control box inside the car

New UIM to LIM and TB Gaskets. No boost leaks that I can find between compressor and TB.