Dyno Results: Apexi Rx-6 w/details [371rwhp @ 13.8]
Thread Starter
Joined: Mar 2005
Posts: 280
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From: St. Paul, Minnesota
Dyno Results: Apexi Rx-6 w/details [371rwhp @ 13.8]
I wanted to post up some information I had about my recent tuning session when Steve was up in Minnesota a few weeks ago.
Firstly, I have been working on my car for the last year and a half, and it's been such an enjoyable experience, I wouldn't trade it for anything! It wouldn't have been possible without all of the help and support from both GooRoo (Andy) and Damian. It's safe to say without their patience and help, I would have sold the car shortly after my cross country trip home upon discovery that the engine was in fact shot. (See my first post as I posted in desperation during the trip home from NY: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/emergency-broke-down-michigan-driving-new-rx-7-home-hotel-432675/ Thanks again doods!
Anyways, onto the dyno results!
The cars specs:
Engine: JDM engine purchased from Fritz. Upon receipt, the engine was sent down to Landers at Rotary Resurrection for inspection/cleaning and porting. I am trying to keep this post as much about the dyno as possible, but I can't bring myself to not mention how satisfied I was with the work I received from Kevin Landers. He sent me detailed pictues, and had great communication with me through the whole rebuild process. Alright, now back to the car!
Porting pics:
Power Mods relevant to Dyno #'s:
Turbo: Apexi RX6
Computer/Fuel: PFC w/550 x 1600, RP Competition Fuel Pump
Ignition: 9's and 10's for plugs w/ HKS Twinpower
Cooling: ASP Large I.C. - Cooling Mist 2 Stage W.I. system. Evans system
Flow: 3", plumbed back into DP, resonated midpipe, HKS Ti exhaust
Boost Control: Hallman manual in bay, 11.8 psi spring, 50mm HKS wastegate.
Car was tuned on 91 octane here in the Twin Cities, with water injection on.
Now, on to the numbers. My goal was to make 400rwhp @ 17psi, and I fell a bit short. The car made 371 rwhp at 13.8psi.
A few issues that kept me from reaching my original goal are the following:
1) Hallman manual boost controller: My boost was bleeding off with the manual boost controller all afternoon. We could get it to boost pretty quickly (10psi @ 3200 and 17psi @3900) but the boost would start to bleed away at 5000rpm, as evidenced in the dyno data.
GooRoo was having the same issue with his hallman setup bleeding off, but it was less pronounced with his setup. (Wastegate spring, wastegate port, other variables etc.) I'm either going to find a way to modify the Hallman's internals with GooRoo and Damian's help, or I'm going to look into an EBC for next season.
2) Water Injection Active: During the runs, I forgot to turn off my water injection kit. Originally, I was hoping to tune without water, and then just add it as a safety net above and beyond the tune. From similar tests performed by GooRoo, we have strong evidence that water is eating approx 20-25 rwhp when the system is active.
3) Very heavy wheels on car for dyno testing: While on the dyno, the car was wearing the street 18" Akuza rims with 245/45/18 tires. I was quite ignorant on the issue, and confused the rims not playing a factor in the tune and performance as the same thing. Basically, the tune will be the tune regardless of the unsprung weight mass variables, but the actual performance would be affected.
Stockers with tires weight: Approx 40lbs per tire/rim.
18" Akuza with tires weight: Approx 56lbs per tire/rim.
Initial estimates for power with the Akuza's is somewhere between 5-10% rwhp.
Conclusion: I am very very happy with the car, and am quite satisfied with its recent dyno numbers considering #1, #2 and #3. I'm looking forward to finding a solution to the MBC creep, so I can try to hold 17psi through the powerband.
Also, I wanted to give a big thanks to Steve for his tuning work. I had such an enjoyable just talking with him and watching him tune the cars over the weekend! Anybody who has met Steve knows what I am talking about!
Here's to the rotary and the joy she brings us all!
-Ben
Firstly, I have been working on my car for the last year and a half, and it's been such an enjoyable experience, I wouldn't trade it for anything! It wouldn't have been possible without all of the help and support from both GooRoo (Andy) and Damian. It's safe to say without their patience and help, I would have sold the car shortly after my cross country trip home upon discovery that the engine was in fact shot. (See my first post as I posted in desperation during the trip home from NY: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/emergency-broke-down-michigan-driving-new-rx-7-home-hotel-432675/ Thanks again doods!
Anyways, onto the dyno results!
The cars specs:
Engine: JDM engine purchased from Fritz. Upon receipt, the engine was sent down to Landers at Rotary Resurrection for inspection/cleaning and porting. I am trying to keep this post as much about the dyno as possible, but I can't bring myself to not mention how satisfied I was with the work I received from Kevin Landers. He sent me detailed pictues, and had great communication with me through the whole rebuild process. Alright, now back to the car!
Porting pics:
Power Mods relevant to Dyno #'s:
Turbo: Apexi RX6
Computer/Fuel: PFC w/550 x 1600, RP Competition Fuel Pump
Ignition: 9's and 10's for plugs w/ HKS Twinpower
Cooling: ASP Large I.C. - Cooling Mist 2 Stage W.I. system. Evans system
Flow: 3", plumbed back into DP, resonated midpipe, HKS Ti exhaust
Boost Control: Hallman manual in bay, 11.8 psi spring, 50mm HKS wastegate.
Car was tuned on 91 octane here in the Twin Cities, with water injection on.
Now, on to the numbers. My goal was to make 400rwhp @ 17psi, and I fell a bit short. The car made 371 rwhp at 13.8psi.
A few issues that kept me from reaching my original goal are the following:
1) Hallman manual boost controller: My boost was bleeding off with the manual boost controller all afternoon. We could get it to boost pretty quickly (10psi @ 3200 and 17psi @3900) but the boost would start to bleed away at 5000rpm, as evidenced in the dyno data.
GooRoo was having the same issue with his hallman setup bleeding off, but it was less pronounced with his setup. (Wastegate spring, wastegate port, other variables etc.) I'm either going to find a way to modify the Hallman's internals with GooRoo and Damian's help, or I'm going to look into an EBC for next season.
2) Water Injection Active: During the runs, I forgot to turn off my water injection kit. Originally, I was hoping to tune without water, and then just add it as a safety net above and beyond the tune. From similar tests performed by GooRoo, we have strong evidence that water is eating approx 20-25 rwhp when the system is active.
3) Very heavy wheels on car for dyno testing: While on the dyno, the car was wearing the street 18" Akuza rims with 245/45/18 tires. I was quite ignorant on the issue, and confused the rims not playing a factor in the tune and performance as the same thing. Basically, the tune will be the tune regardless of the unsprung weight mass variables, but the actual performance would be affected.
Stockers with tires weight: Approx 40lbs per tire/rim.
18" Akuza with tires weight: Approx 56lbs per tire/rim.
Initial estimates for power with the Akuza's is somewhere between 5-10% rwhp.
Conclusion: I am very very happy with the car, and am quite satisfied with its recent dyno numbers considering #1, #2 and #3. I'm looking forward to finding a solution to the MBC creep, so I can try to hold 17psi through the powerband.
Also, I wanted to give a big thanks to Steve for his tuning work. I had such an enjoyable just talking with him and watching him tune the cars over the weekend! Anybody who has met Steve knows what I am talking about!
Here's to the rotary and the joy she brings us all!
-Ben
Nice numbers
it would be nice to see the torque curve as well
I just installed my RX6
from the pics it looks like you have the older b model too
get a EBC and turn up the boost
it would be nice to see the torque curve as well
I just installed my RX6
from the pics it looks like you have the older b model too
get a EBC and turn up the boost
Thread Starter
Joined: Mar 2005
Posts: 280
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From: St. Paul, Minnesota
Bottlefed: Here was the torque information, good luck with your setup too bro! I received the turbo from Damian when he moved to the R-85. This was the turbo that was in the track car that Damian picked up from Fabian a few years ago. (Yes, the turbo is rich with Road Racing history!!!)
rx7twinturboboy: Yah, it's a great setup for the street, 10psi @ 3200 =
Damian and Andy still think there is something weird about my setup which is causing it not see full boost as early as it may be capable of.
One of the advantages to an EBC may also be a slightly faster spool up... getting 10 psi below 3000k would be really nice.
rx7twinturboboy: Yah, it's a great setup for the street, 10psi @ 3200 =
Damian and Andy still think there is something weird about my setup which is causing it not see full boost as early as it may be capable of.One of the advantages to an EBC may also be a slightly faster spool up... getting 10 psi below 3000k would be really nice.
Joined: Mar 2001
Posts: 30,807
Likes: 648
From: FL-->NJ/NYC again!
I would definitely junk the MBC, along with fouled spark plugs those things are one of the worst 'dyno day party poopers' I have ever seen.
It looks like you have a nice setup and a sharp looking car man, have fun with it
It looks like you have a nice setup and a sharp looking car man, have fun with it
In my post above I meant to say the a model (not b)
that is a nice torque curve
it is also nice to see the AFRs that Steve tuned it for - gives me something to model mine after
why did he cut it off at 7500rpm? does the turbo drastically run out of steam after that? I guess the curve starts to drop after that... but I've got my redline set at 8300rpms (usually shift at 8K)
that is a nice torque curve
it is also nice to see the AFRs that Steve tuned it for - gives me something to model mine after
why did he cut it off at 7500rpm? does the turbo drastically run out of steam after that? I guess the curve starts to drop after that... but I've got my redline set at 8300rpms (usually shift at 8K)
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Joined: Oct 2001
Posts: 6,279
Likes: 728
From: Florence, Alabama
ben,
congrats on a nice setup, it looks like you are on the right road. it was super to see the car going fast at Road America. Damian sucked you in to the slippery slope. there is no 12 step for road racing
howard coleman
congrats on a nice setup, it looks like you are on the right road. it was super to see the car going fast at Road America. Damian sucked you in to the slippery slope. there is no 12 step for road racing
howard coleman
I remember reading your first thread; you've made a lot of progress since then. I'm glad the car is treating you well now, and congrats on the dyno numbers. I'd like to pick up an RX-6 kit myself someday.
-s-
-s-
