- Joined
- Feb 18, 2018
- Messages
- 688
As a new season of fun starts again, I went back to ensuring all systems are a go and did a quick test to see if the 15psi (low boost setting) is as good or in line with last year. Hopefully there are no nasty surprises from the hibernation!
I started with doing some quick back to back hits from 60-100mph (in mexico) to ensure all is in line with the previous year. Thought id spend a bit of time playing around with the injection timing and test a few different settings to see if it makes any difference in the real world?!
This year the FD has 2 big changes which will impact draggy times...effectively making it a slower.
1st change - 245 35 18 cup 2 front to 265 35 18 cup 2 front.
2nd change - BGW is back on!
Both mods guaranteed to slow the car down in acceleration tests.
As i'm on the link g4+ (for now) it runs start of injection.
I was running a setting last year of 270 -330deg which wasnt too bad and at 15psi at 11.1afr it ran a 60-100mph as confirmed below.
I also ran 90 - 180 deg and 440 - 300deg and couple more variations, which resulted in similar or slower times.
I think the best i did last year was 4.42 from 60-100mph on the G35 1050 street port at 11.1afr. Easily fast and fun for street and track use.
I spent a bit of time with the trial and error method to try and find the best start of injection numbers and settled on 90 -105 degrees which in my testing netted the best results for me! 90deg from 0-5krpm made the fd the most responsive on and off throttle and 105deg above 5krpm again made it buttery smooth and the response was the best i'd ever experienced. Every other setting i tried could not compare subjectively when behind the wheel. The biggest improvement in my opinion was the throttle control and linearity of the power delivery.
I re-tested quite a few different combos noted above with injection timing (took a while as the afr changed and had to spend a more time to get the 15psi back to 11.1afr, it was such a tedious process)
I tested it on draggy and surprisingly, the new injector timing (90-105 degrees) shaved 0.16 seconds off my 60-100 mph at 15 psi boost 11.1afr same as last year (I genuinely did not expect any improvements). In fairness, tt's not a night-and-day difference on draggy, but a significant subjective improvement behind the wheel and free performance is always a win ahh and i pulled out nearly 5-10% fuel in the idle and cruise areas as compared to the 270-330, 420-300 deg options. In terms of smells the fumes nearly eliminated.
With the baseline numbers looking good on the streetported engine, it's time to push the 100-200kph!
The aim is to determine if a streetported RX7 with a small turbo can consistently achieve low 6-second to high 5-second performance in 100-200 kph acceleration with the standard box and diff. Stay tuned to see if this setup can achieve these aggressive goals!
I started with doing some quick back to back hits from 60-100mph (in mexico) to ensure all is in line with the previous year. Thought id spend a bit of time playing around with the injection timing and test a few different settings to see if it makes any difference in the real world?!
This year the FD has 2 big changes which will impact draggy times...effectively making it a slower.
1st change - 245 35 18 cup 2 front to 265 35 18 cup 2 front.
2nd change - BGW is back on!
Both mods guaranteed to slow the car down in acceleration tests.
As i'm on the link g4+ (for now) it runs start of injection.
I was running a setting last year of 270 -330deg which wasnt too bad and at 15psi at 11.1afr it ran a 60-100mph as confirmed below.
I also ran 90 - 180 deg and 440 - 300deg and couple more variations, which resulted in similar or slower times.
I think the best i did last year was 4.42 from 60-100mph on the G35 1050 street port at 11.1afr. Easily fast and fun for street and track use.
I spent a bit of time with the trial and error method to try and find the best start of injection numbers and settled on 90 -105 degrees which in my testing netted the best results for me! 90deg from 0-5krpm made the fd the most responsive on and off throttle and 105deg above 5krpm again made it buttery smooth and the response was the best i'd ever experienced. Every other setting i tried could not compare subjectively when behind the wheel. The biggest improvement in my opinion was the throttle control and linearity of the power delivery.
I re-tested quite a few different combos noted above with injection timing (took a while as the afr changed and had to spend a more time to get the 15psi back to 11.1afr, it was such a tedious process)
I tested it on draggy and surprisingly, the new injector timing (90-105 degrees) shaved 0.16 seconds off my 60-100 mph at 15 psi boost 11.1afr same as last year (I genuinely did not expect any improvements). In fairness, tt's not a night-and-day difference on draggy, but a significant subjective improvement behind the wheel and free performance is always a win ahh and i pulled out nearly 5-10% fuel in the idle and cruise areas as compared to the 270-330, 420-300 deg options. In terms of smells the fumes nearly eliminated.
With the baseline numbers looking good on the streetported engine, it's time to push the 100-200kph!
The aim is to determine if a streetported RX7 with a small turbo can consistently achieve low 6-second to high 5-second performance in 100-200 kph acceleration with the standard box and diff. Stay tuned to see if this setup can achieve these aggressive goals!
Last edited:
) is 54.431
) to be able to drive back home. That concluded any further tuning for the night. It was a bit disappointing as I was in the zone and only had 0.1s left to find in a rather conservative tune ha!
