Return restriction would show highest pressure at idle (maximum return flow) not on boost unless he is running PWM pump speed control.

if the return was restricted or regulator undersized differential pressure would decline with increasing power output.

 

"Return restriction would show highest pressure at idle (maximum return flow) not on boost unless he is running PWM pump speed control.

if the return was restricted or regulator undersized differential pressure would decline with increasing power output"

.yes, you are correct. i am glad Pat's fuel pressure situation is fixed.

 

Close but no Cigar! Just 0.13s off my previous 60-90mph pace. Only a matter of time till i get the setting dialed in and run a new PB.

 

Good progress.

@Howard Coleman everyone flips their thoughts occasionally. I certainly appreciate you sharing data long term in the forum.

 

Getting better with acceleration 60-90mph 0.07s off previous pb and 60-100mph around 0.13 quicker than previous PB already. So some progress is being made.




I need to continue working on the transient fueling and accel fuel between the 3rd to 4th gear shift at 24pi to increase acceleration because dragy is a cruel mistress. I've done around 10 60-90/100 mph pulls at 24psi and things are looking good to continue up to 29psi.

 

Back to PB pace - Managed to match my previous PB (0.02s faster, small win) despite running in much hotter ambient temps. I was up to around 25psi and still a way off from the optimal tune, so it's actually quite encouraging and slowly getting there! Makes me feel happy the new fuel system is doing the same things repeatedly and consistently. I want to give Omar from Raceonly credit for sending over some crucial bosch injector data to make these injectors work well. Thanks mate.



Did another run at 26psi on a pretty lazy tuneup, and it still managed a low 6-second pass! The plan now is to dial in 26psi as best I can before stepping up to 28psi. I’ve got a feeling I won’t be able to push all the way to 29, since the ECU’s map limits and safety settings will probably kick in just before maxing out the 3-bar sensor.



Took the M3 out for a little "mental reset" drive today and it really hammered home just how ridiculously engaging, visceral and raw the RX7 experience is. Nothing quite like it.

I love the M3, its one of the greatest hits from M division but it a completely different animal! Refined, comfy and quiet.

Took a step back from chasing boost the past couple of days to appreciate the FD as it is right now and honestly, I’m loving it.



For a pump-fuel streetport running a modest G35, this thing is putting down seriously impressive performance. I reckon a lot of fellow FD owners would absolutely love this level of performance. Sometimes it's nice to enjoy the setup rather than always pushing for more! I mean just have a look at modern cars running between 5.9 - 6.2s range.

 

How do your intake air temps look on that log?

 

I used a bit of WMI injection to help manage the temp, so the run started at around 22°C and peaked at 35°C. After the run, WMI brought the temps down to about 16°C, but it eventually stabilized around 27°C.

 

Firmly in the 26psi range now and it's still getting better! I need to shift better from 3rd to 4th shift. Only about 2psi left to squeeze out, getting close to the sweet spot! Fuel pressure and duty cycle are stable and not stressed.

 

Looks awesome. Well done

 

Thanks and means a lot coming from you .

 

Tubby getting in the sweet spot and honing in on the tune up!
G35 26.5psi ~ 1.8bar

 

What's the intention of your test protocol? Is the expectation that you are already WOT and target boost when you sweep through 100? Or more like some of the motoring magazines used to do, throttle stomp from base speed?

 

For me it's more about the fun and joy aspect rather than doing anything scientific. The draggy results is the objective piece of data, which can be used cross platform to compare overall power and acceleration. My intention is to simulate real world roll on performance as I'm already at WOT building boost as I pass through 100 km/h. I sweep from 3rd gear at 3krpm to 8k rpm (like a dyno pull), then again in 4th. This helps me assess acceleration, transient fueling, and engine response between that manual shift and if there's anything i can do to improve performance while keeping it reliable and consistent.

 

27psi and still moving up slowly but surely with a sub optimal tune up.

All performance metrics hit a new PB today. For the first time ever, my 60–90 mph time dropped below 2 seconds showcasing strong performance during a third gear pull.

The current limitation is the stock box, which is costing approximately 0.45 seconds during a manual shift. This includes time lost off boost as the turbo goes into vacuum and has to spool up again. A DCT or dog box would eliminate that downtime, keeping the turbo spooled and likely shaving off at least another 0.3 seconds, possibly more. That said, the stock box is impressively holding up to some serious abuse!



New PB of 100-200 in 5.71s, the small wins add up!

 

I'm sure your ecu has a flat shifting option? Obviously not as good as a dog box/sequential strain guage setup, DCT or auto but shouldn't drop as much boost as having to throttle off and pick up again.

Depending on how aggressive it is/you want it to be you can probably flatline boost through the shift. If going extreme with ignition retard you just need to be mindful of trailing plug position relative to next rotor face if it's not set up to be able to fire leading only in flat shift conditions.

 

flat shift
also no blowoff valve but this is always controversial
a Tilton clutch flow valve is also a good option to reduce shock stress on the powertrain.

 

If you flat shift an OEM trans your gona hurt it.
I would continue as you are and keep sprinkling that boost. You got her singing now

 

"If you flat shift an OEM trans your gona hurt it."

if you flat shift you will get very good at installing additional transmissions

 

Its mega scary to think about flat shifting the oem trans at this boost level. One mistake could be disaster. I did get the logic working but then i broke my previous box on a trackday at 14psi...maybe i had hurt it from prior setup of the flat shift logic as third gear stripped after i hit a curb on track and got back on the power.

 

.

 

Same boost but this was THE shift!! 0.249s on the log for the stock box.


5.58s range with 27psi I did it but still working on believing!!

You Tube

 

If gearbox fragility is a major concern surely boost per gear to protect 3rd being it's the one that suffers most displacement on load? Shifting into 4th is of least concern as it's direct drive input to output. Generally only guys on drag radials shearing input shafts?

 

She's moving out!!!! Awesome work bro! Glad to see you still out there pushing it!

It's motivating me to get back out for some Dragy runs and try to better my time.


Steve

.

 

I may give it a go at the very end when i hit some form of equilibrium in the 100-200s. Still have to enable DRS system (remove big gay wing) and perhaps tape up the front bumper to bonnet gap and headlight covers. maybe another psi of boost left before map sensor is maxed out and trial and error an optimal tune. Hopefully wont take too long to test and find limits. I rekon i'm already there with 27-28psi but would like to push up to 30psi and see if thing improve.