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Twin power and 14.4 peak boost yielded 340rwhp/283tq. I kept it on the rich side for safety, could have squeezed a few more out it, but why push the car that hard for something that can't be felt. The injector duty cycle was at 91.3% so we are done until the fuel system is stepped up. Keep in mind this car still has all of it's smog equipment intact and functioning. So from where we started on Monday morning we have picked up a total of 86rwhp & 61tq and have only raised the overall boost by 2.7psi.
Last edited by Banzai-Racing; 08-23-16 at 03:30 PM.
Impressive, this gives hopes and inspirations to us the ones who want to keep the car as stock as possible and still make decent power. You guys are the best.
about 2 hrs total for tuning, but it is a twin turbo base map that I have been fine tuning for over a decade, hence the 340rwhp.
Part of what should be taken from this thread is that all the bolt ons and the base map PFC gained 41hp, with much better transition, but with proper tuning and the addition of the HKS twin power I was able to more than double that gain with another 45hp for a total of 86rwhp increase. Our customer is going to have a difficult time with traction considering he has stock wheels and tires.
Last edited by Banzai-Racing; 08-23-16 at 05:27 PM.
Can I ask a question, If you was to remove the engine and do a street port then reinstall what sort of extra power would be made and where would it be on the graph. (keeping all other things the same).
Very nice job. Really enjoyed reading this thread. Brought back lots of memories of mine when I still had stock twins! Great result! Was this on 91 or 93 octane?
Very nice job. Really enjoyed reading this thread. Brought back lots of memories of mine when I still had stock twins! Great result! Was this on 91 or 93 octane?
Thx Chris!
same here. trying things on the spot before and during the dyno. !
Good job! Just like others members of the club I do enjoy reading about details on how to get the best out of your RX7 with the right bolt on upgrades. One thing that Im confused because it seems like a lot, on your last upgrade you connect the HKS Twin Power. What else you did to get 23 RWHP? I think I saw that you raise boost from 12 to 14 PSI but Im not sure. Thanks for taking the time to do a nice write up. I also enjoy your page a lot. Lots a good info, pics and combinations on the Dyno charts either for single turbo or TT
Great thread. It's amazing to see the difference in boost and torque curve from the stock ECU to the default PFC map considering the actual hardware on the engine didn't change (same turbos, same exhaust, same intake, same restricter pills, same boost solenoids).
Right now with the parts and tune you are basically a "stage 2" in the modern/Cobb parlance and you picked up all that power on a 2800lb car. And it would still pass an emissions test and not smell like gas driving around.
Forgot to show low boost with HKS twin power, so I strapped the car back down and did a quick pull this morning. The air quality has changed a lot since yesterday, it is far more humid and hotter, which reduces power. That being said the car the car picked up 7hp with the twin power installed. I have also included a low boost from today comparison to yesterdays high boost run, along with a shot of the engine bay as it is going back to the customer.
Last edited by Banzai-Racing; 08-24-16 at 09:54 AM.
Thanks for the response. Im about to invest on the HKS Twin Power and I always wonder if It was worth at this point to invest $400 in something that I don't even know that is going to make a significant difference on my car performance. Question answered. Thanks!
It took so long because dyno time is expensive and most shops don't bother to put a car on the dyno unless there is something to tune. Even this experiment took twice as long as it normally would have, as typically all the parts are installed, then the car is tuned.
I was looking to seeing how the "three mod rule" with the stock ECU would hold up. Since there are people that say it does/does not exist, however, I have never seen any documented proof in either direction. What we have found on this car is that the spiking at transition started immediately after the catback was installed along with the DP. This would not have been as aggressive if something restrictive like the RB was installed, however peak HP is also hurt. I feel that with the findings in this thread for this particular setup, that it would have been beneficial to install the PFC very early in the modification process. The AFR's were rich but the boost was all over the place.
The other thing is, the internet as we know it didn't exist when this car came out. Nowadays when a new car comes out, people immediately dyno it stock and put the sheet on the internet. The various vendors for new parts put before and after sheets on and tunes + parts are sold as packages, advertising a specific amount of horsepower.
This is such a great thread, I've been looking forward to each installment and they have come very quickly!
Question about the choice of Walboro fuel pump...what was the reason for using this over the Denso? Did you do any wiring changes to support the pump or just drop it in?
The Walbro 255 is a very capable pump. I have never had a problem with any that I have installed in over 15 years. The issue is when people buy cheap knock offs on ebay or install then incorrectly. This one was dropped in no rewiring or additional relays.
I have had issues on multiple cars with the Denso TT pump not supporting more than 450 rwhp as the fuel pressure dropped at 19psi of boost. Swapped them for Walbro 255's and continued tuning to over 23psi & 500rwhp. It also costs twice as much, the only upside is that it is quieter.
This of course is my opinion and experience, others will have differing opinions, but that is not what this thread is about.
Last edited by Banzai-Racing; 08-25-16 at 06:42 AM.
08-23-16, 03:27 PM
