speeddemon32

everything is really a wash right now I think. I also think none of this has anything to do with oil.... look at those air fuel

Nemesis8

iTrader: (3)

Cool - 200 RWHP all motor. Welcome to the club

speeddemon32

thanks.... as long as the air fuel stays put I guess i am in there.

dont knwo what to do about that at this point... :/

olddragger

iTrader: (3)

im dizzy thinking about this.
olddragger

r0tor

iTrader: (1)

definately why i've never trusted any dyno numbers with this and perfer real world driving results as a performance indicator

... this reminds me to a confused time a few years ago of doing log after log of real world AFR around 12.0 stock WOT and estimated hp in the high 190's and comparing with dyno's posted here with 17x hp and afr lower then 10... the damn car does not dyno right

BoosTED

iTrader: (2)

Is it because of not getting a good RPM signal from the engine?

TeamRX8

iTrader: (25)

Enjoy the fact that you have a sponsor providing you with a quality product

ps: after all those dyno runs don't forget to change your oil ...

pss: the dyno rpm pickup signal has nothing to with the AFR reading or how the engine management system works

.

speeddemon32

he he he... yeah I guess that is true.

still would be nice to know what is going on under there though. :/

Will work on the dyno charts and stuff tonight. will post more later.

speeddemon32

here are 9/10 of the dyno runs.... for some reason pull 2 will not graph.... no biggy.


as you can tell there is something wacky going on with the air/fuel. the 3 strong runs were all with the engine running more "normal" air/fuel ratios. the "bad" runs are much richer. take a look at that pink run (run 7 - the first one out of 4 today) look at how rich that one was!

whats going on. if there is ignition breakup (like the untouched graphs show) that would cause the fuel not to burn.... or maybe something to do with the computer??????

whats a little on the odd side, is I dont feel the differance when I drive the car.... then again this is comming from the guy that cant tell the diffferance when I put the intake, flywheel, & pulleys on. I think my butt dyno is broken.



here is a video of the last run today.
http://www.youtube.com/watch?v=aUCJ7Aw8bFk&q

olddragger

iTrader: (3)

you appear to have some big dips there dude. on run 8 it appears to be a 15 hp dip at 7.2K. You got some sticky valves? Intake i mean. Check for condensation in the oil filler pipe.
excluding runs 9 and 10 and they are all within range
OD

speeddemon32

seems to me (judging by the air fuel) that the 5th, 9th and 10th runs seem to be the only runs with the AF closer to whare it should be...... right? optimum is ~13.5 or so.

this would make me think that all of the other runs are "out of range"??? am I alone in that?

speeddemon32

just compared my results above with some other members Dyno sheets on the dyno section. it does seem everyone hase those dips, but it does apear mine might be a little more drastic. also only a couple people I saw had AF ratios, but yeah it does look like I am the only one with the AFs that low (at times)

Brettus

iTrader: (2)

I agree with OD - your high rpm intake valve is not opening properly every time . This seems logical - if it doesn't open you get less air therefore a richer mixture . Worth checking this anyway.
As an aside - I noticed when I was dynotuning my 8 that you could get some wild variations . The method we used (eventually) was if two back to back runs were near identical - we would take that as an accurate run.

BTW : i've done lots & lots of runs checking the AFR's & never got much variation from run to run . Just to add to the sticky valve thought .......

speeddemon32

how would I go about checking the sticky valve? I have plenty of 2nd gen experience, but little RX-8. only in bolt ons and stuff like that.

and yes that would make total sense. intake not opening every time, ignition cutting out, computer freaking out (or sensor telling the computer... like an O2)


the 201s were back to back.... it seems as if I have two modes... the mid 180s and the 200s..... (the 191 is the odd ball if you look at all of those numbers)

thanks for the help.


EDIT: I don’t remember when the valves open, but is the last one at 7,700 RPMs (that looks like when the failure is.) or does the last set of injectors open then? seems a little high for anything to start happening there, but I really just don’t remember when what does what.

also seems to me that if the valves are not opening it would get rich on a more "smooth" fashion. the graph is showing something that is hard hitting..... like injectors opening up....????? ..... or does both heppen at that point?

Brettus

iTrader: (2)

yeah - those two back to back runs in the 200's - I would take those as being reliable

No idea how to check the valve though

speeddemon32

shoulda tried for a third... just for the fun of it.



OD said I should look for water in the oil fill tube...... OD what would that tell me??? (besides weather or not there is water getting in the oil)

TeamRX8

iTrader: (25)

I disagree, on the worst run it is rich all the way through, and the valve dips all correspond appropriately

when's the last time you cleared the computer trims? I tend to suspect the knock sensor, if anything ...

speeddemon32

that day.... before all runs.....

by clearing them your talking about the 20 pumps on the brake right?

TeamRX8

iTrader: (25)

no, that's not clearing the full PCM, I prefer to use a scan tool, otherwise I'd recommend RB's room fuse procedure

speeddemon32

...... hmmm..... ok then..... I dont know the last time they have been cleared... I would inmagine the last time the battery was off?????

why would this show 7/10 dyno runs as way rich at 7,800? you have something in mind?

TeamRX8

iTrader: (25)

you can't establish a baseline if the computer is at different fuel trim levels, by resetting it you are always working off the PCM's base map, you can always get back to that setting by clearing the PCM, it's explained on the RB flash site, which should be your next mod

Brettus

iTrader: (2)

Team - the base trim level is not going to give a wildly varying result like that .
Also - the ECU would not make changes that radical from one run to the next.

TeamRX8

iTrader: (25)

it can, and did

Razz1

I think you ought to dyno it again this Saturday.

Then you can get 210 HP and make claims it was due to Amzoil.

Actually if you keep this up you may hit 220 RWHP!

Maybe this is how SR got 15 HP from pullies along with other mfgr. claims to high increases in HP

Brettus

iTrader: (2)

Team - I respect your knowledge - how can you know that is what happened ?