My A-Spec 500R Kit Dyno Charts

[TurboSquirrel]

Had my '93 tuned by Ray Wilson at PFSupercars last week. Very happy with the power numbers but the lag is pretty bad.

Tune was with 93 octane gas, Ray said I was making about 15HP / pound of boost.

I've marked each graph at the point max boost was achieved (15.9lbs @ 5.6K rpm). On the road it seems more like 6K rpm until max boost though....

Mods include:
- Tial 44mm WG w/ .9 bar spring
- Greddy 3-row FMIC
- 550s/1600s, Supra pump
- a-spec long runner manifold

Would be very interested to know from others with this kit how much boost they're running and what RPM it is reached at.

I'll put some pics of the kit in the next post.

[TurboSquirrel]

Here's a few pics of my A-Spec 500R Kit pre-install...

[DamnitzRoger]

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

[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

[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.

[Phoenix7]

Why are you getting full boost so late?

[TurboSquirrel]

Originally Posted by phoenix7

Why are you getting full boost so late?

No idea, really wish I knew. I wanted to see if you folks had any ideas?

Someone was looking at it Saturday at the Speed for Sale shootout and thought the manifold looked pretty restrictive....

Again, I'm happy with the power, just wish it was more responsive.

[David Jerome]

The car pulls great up top, but it should be seeing 15lbs by around 42-4500 not around 5300 rpms.

Here are some pics of Kevin's car, one of the best looking fds in the country in my opinion.

[TurboSquirrel]

Originally Posted by David Jerome

The car pulls great up top, but it should be seeing 15lbs by around 42-4500 not around 5300 rpms.

Here are some pics of Kevin's car, one of the best looking fds in the country in my opinion.

Sweet pics David thanks! The compressor does look big in that one, lulz.

[Phoenix7]

holy giant turbo of immensity! That thing is HUGE!

Any porting done to the motor?
Is it possible the manifold isn't working with the exhaust flow (if motor is ported)? Looks like the mani starts off wide, then gets narrow and then wide again, right by where your hand is. I really don't know a thing about the A-spec manifolds though. Any more info?

Worse case scenario you add a bit of nitrous to get the car going?

[David Jerome]

Originally Posted by phoenix7

holy giant turbo of immensity! That thing is HUGE!

Any porting done to the motor?
Is it possible the manifold isn't working with the exhaust flow (if motor is ported)? Looks like the mani starts off wide, then gets narrow and then wide again, right by where your hand is. I really don't know a thing about the A-spec manifolds though. Any more info?

Worse case scenario you add a bit of nitrous to get the car going?

The turbo really isnt that big, not in my opinion any ways. I would be interested to see how that turbo acts on another manifold. I installed a T04R recently which is very similar in size with the .84 exhaust housing and it would hit 15lbs by 4k rpms with no problems.