opps my bad--you are correct sir. Its been so long since I did that i simply forgot.

Would like to give you credits for believing in your idea, invest time and money in trying it out.

Just like a good scientist you observed(even if observation was triggered by a malfunction:)), then made yourself a hypothesis why, then put it to test. Very good. Even if it did not work like you was hoping, knowledge is increased.

People like you drives development further.

Thanks!

Thanks for all the positive comments . I really did think this could have been something good for the RX8 community if it had panned out .

As it is - I still think I will dyno the car with this mod in place . There just might be a bit extra up top .
If there is , however , it certainly wont be anything earth shattering.

This is pretty interesting and seems to support what I've been feeling seat of the pants .
Two virtual dynos


New engine with port mod
https://www.rx8club.com/attachment.p...1&d=1359670446


Old (low compression) engine
https://www.rx8club.com/attachment.p...1&d=1359670446

Mid range torque seems reduced but there is an improvement from 7000 onwards .

The comparison is a bit skewed below 6500 because I was running an extra 2 psi of boost on the old engine in that range . From 6500 onwards boost should be fairly close between the two plots.

Should throw this in here as well because it shows pretty well the effect of the boost controller on MAF . This is an internal wastegate with the WG arm held at a certain position to stop it fully opening.

Red - no boost control
Blue - Boost control on at 10psi (spiking to 12 at 4500 )

Nil effect from 6500 onwards .


https://www.rx8club.com/attachment.p...1&d=1359674889

very interesting!
would the difference in gear ratios have any affect on the virtual dyno--I am not familiar with it.

It sure would - that's why I made sure those are correct ;)

I can see your settings on the side, dynojet with 1.11 is pretty generous

Yeah - but it looks good :)

I keep looking for the damn like button!

it would be nice to get a hold of this software just for viewing logs and such!

I don't suppose he has a version like that for free?

Don't think you can import csv logs into it - you need the tactrix 2.0 hardware and then that has to be mated with the software .

hmmm - this is getting better . Cooler IATs this time down to 26C

Still on dynojet setting but yeah ............... 374. In the cool night air the car feels very strong up top .
350whp @ 10 psi might not be such a wet dream afterall ...............

One of the keys to getting a good reading on virtual dyno is a smooth road , bumps etc play havoc with it .


https://www.rx8club.com/attachment.p...1&d=1359710179



In other news - I learn't how to tune the hillbilly way today . Seeing as how i can't flash my ECU i had to find a way to richen up the tune under boost . An induced air leak just after the MAF did the trick nicely by removing most of the negative trim :)

Also : set up the overboost safety as talked about earlier using my old vfad valve and a pressure switch - works well !

welcome to my world--lol

DIY on the boost safety? I have a few actuators laying around.

Think I'm going to redo it once i get my fuel pressure gauge installed and run it off the spare air pump solenoid instead (as suggested earlier) . That will give a more positive dump plus the added safety from low fuel pressure .

Cool, look forward to seeing how you do it.

Sweet
Would love to see some pics and setup on this

Everyone wants to know about the boost dump valve and no one seems to be interested that the port mod might actually be working .... LOL

Maybe (to me anyway) it's because of the way the post reads

Seems like it might be working just because it was cold outside

I've had my car out in -20c and boy does that make a difference

Ok then Brett spill it ... full disclosure ... pics, diagrams and pie charts with a full write up

Yeah that is what is so aggravating to me about tuning. My car runs like a beast when ambient temps are below 50F, but now that it has been getting to high 70's, lower 80's my car seem to be running richer. I will get into the tuning heavy this weekend and see what I can fuck up.

whats 374whp, if your fuel pressure drops and you blow the engine.

we demand safety mod details!!!

hehe

i am guessing a hobb switch, solenoid, hook to vacuum box and BOV?

Point taken .
OK - my initial impression of the setup was disappointment because I didn't see a huge gain and the car didn't feel as snappy as i remembered it to be. But when i think about all the things that have slowed the car down incrementally . IE Gear ratios higher , new tyres -slightly larger , removal of LW flywheel, running less boost low down , and high IATs .
Taking all that into consideration , maybe I was a bit quick off the mark . What i felt last night in cooler air was the best the car has ever been in the 7000-8000rpm range .
Does that spell it out a bit better ? :)

Yep - real simple

what maf voltage?
Glad the second look --looked better!

4.77v

LoL
I love this thread

Ha nearly about to max out the maf!

there's always...

http://1.bp.blogspot.com/_Yb5Qjt-TpN.../s1600/MAP.gif

Sorry, couldn't resist... by product of having too many kids.

He could also just put the MAF in a bigger housing to reduce air speed and recalibrate :P

thewird

Still have 45g/s up my sleeve and it doesn't look like i'll get to that as I'm almost at the limit of adjustment on the wastegate.

4:77? Dang--got me beat! I topped out at 4.6 something at 8.2K rpm--7-8 psi of boost.
I bet it is screaming--woo hoo!
Congrats ole buddy--Congrats!

Not really one to get excited about maf voltages - seat of the pants is actually the best indicator i have . Which tells me - less down low more up top .
So depends on if you are a tit or an ass man as to if that's good or not :)

understand--but you are moving some air:)
Driveability/personnel performance preferences are not reflected by numbers--very very true.

Is the grin back on your face?:)

What injectors are you running and what duty cycle are you seeing?

Hey Brett what is the g/s at 4.77 volt on your Maf scale?

Mine is 442.73 g/s

Not really - the drop in low end makes the car feel sluggish to me . The lift up top is nice but I'm rarely ever revving that hard anyway.

yellow/yellow/blue

Have not checked DC sorry . I know I haven't run out of injector though.

375g/s

Yours is 442 ? Wow , why so high ?

^^^^ Clearly I need to investigate
Mmmmm seems to work ok

I'll be making enough changes to the intake that I'll need to basically start from scratch with my tune. I'll make sure to watch this area.

Thanks

(Cars parked for the winter)

UPDATE:

Bruttes: "I put the car on the dyno and made 398whp!! its incredible!!"









































j/k

Haha . Well I debated putting it on the dyno with the port mod in place but my butt dyno tells me the expense of doing that is not justified .
I'm going to take the sleeve out and fit a stock one because the loss of spoolup and midrange torque has taken a lot of the spark out of owning a turbo 8. It used to rip the panties off unsuspecting women - now it just makes them giggle a bit - just not the same !

This experiment has definitely turned me off the idea of going for a big turbo and high peak whp .

so watcha going to do when you install the port again and it still responds the same?

shoot myself

just write me into your will as the receiver of all things rx8 related

can you go back to your original turbine wheel and housing?

:yelrotflm

Nothing has changed on the turbine side .........

The compressor wheel was the only thing changed .

I would be curious to try the orginial compressor wheel and see what happens, not sure which is easier, but it would give you a better idea of what that port is really doing. apples to apples.

I hear ya . But i also have numerous logs from people with 60-1 greddy turbos and what I have gleaned from those is that my 60-1 turbo is spooling poorly by comparison . So in my mind there is only 1 variable .

Drop an REW in it and call it a day. Stock motor and turbo's (though I'm not sure you can fit them) can make 300-330 rwhp without breaking a sweat.

thewird

that's the only logical choice IMO, an FI Renesis engine failing is just a matter of when, not if ...

The legit way do you think you could pass Ontario emissions laws with this setup?

Don't know what they are like in NZ