olddragger

iTrader: (3)

i have never seen over 10psi? most of the time i have a straight 9--from 3K up( I dont full throttle until AT LEAST 3K)
Does that mean I have belt slippage? Would I not hear it and wouldnt the engine be erratic?
Maybe my gauge? Mechanical boost/vacum with hook up at the lim.
I am moving good air per maf.
Phil how is your idler pulley done?
????
OD

Phil's 8

iTrader: (3)

Well the idler pulley seems OK but when we get the main pulley done I don't know. Jeff was telling me my air flow was good but..............I never heard the belt to pulley but watching the dyno it was obvious something was wrong. I need to let MM explain it as i was so dissapointed that I may have undersood something wrong but I was flat told that it was slippage by the belt.

MazdaManiac

iTrader: (3)

Yeah, your belt started slipping almost immediately (around 4500 RPM, IIRC), but was screeching like a banshee by 6200 RPM.
You could see on the dyno plot that the boost was surging/oscillating with increasing amplitude as the RPMs went up.
By the time you hit 6000, your manifold pressure was swinging back and forth between 6 PSI and 28 PSI!
However, your airflow was fairly consistent with your actual torque curve.

Rote8

Interesting, did the dyno logs show this pressure fluctuation?

6000 RPM on a 6 port with the large pulley is right at 13 to 14 PSI, I suppose the lower volume of the 4 port runners could account for the increase to 28 PSI.
Neither the 6 rib belt, nor the blower pressure design is intended for 28 PSI, but still awesome boost from the Lysholm.



Update:

The spacer block between the S/C and the S/C pulley may have been installed backwards, if the top blower pulley was ever removed; it is only designed for one orientation to the blower pulley.
The small aluminium spacer should be checked for weird wear, or chatter marks, also torque the S/C pulley bolt down if the pulley slips on the S/C input shaft.

Brettus

iTrader: (2)

I thought you guys were all converting to ribbed for greater pleasure ?

olddragger

iTrader: (3)

ha ha--need more than 6 then

MM/Phil ---Dang! A/f's where also affected during the boost fluctuation?
Good tune must have saved him or at least helped.

Who is getting 12-14 psi boost with this system? Like I said I have never seen over 10 and 99% of the time I am at 9.

Root for me --I am headed toward Roebling Road raceway to drive 8 sessions tomorrow with Seat Time. Its my favorite track. Its a Good Friday

california style

ha, just did an airfield autoX day again. I love my car soooo much. It rained and was slippy, and I was power sliding out of corners half way up the straights to the next one! I even did a bit of involuntary rally cross (whoops!) but thankfully didnt get stuck int he mud.....

One cone was great and i was turning into it well before I even got there and doing hero drift all the way around (about 220 degrees or so!) Sweeeeeeet!

The charger gives so much throttle controllability its fantastic....

MazdaManiac

iTrader: (3)

I bet your times were awesome. lol

california style

jeez was the emoticon appropriate or necassary??
I wasn't trying for times at all...
I was having fun... if that makes me a w@nkler then perhaps you should check your priorities?

MazdaManiac

iTrader: (3)

My priorities are to net good times when I'm at a competitive event.
When I see other guys out goofing off while I have to stand out there in the rain working, I think .

So, yeah. You're a "w@nkler". lol

olddragger

iTrader: (3)

If you like drifting like that --you should try modifing the motor mounts --it does give you more on an "instant/solid" throttle response!
Just did a track day at Roebling Road this past Saturday. Used a tank and 1/2 of gas!
My 09 pump is still kicking *** (this track is the one that is notorious for starvation) and i was able to run until 3 dashs from empty.
Modified S 2000's are fast and smooth I can tell you that, but watch their tails--they will kick out at times. These one's did not brake as good as the 8's.
Temps were great and car ran very well---no issues. I only went above 7K rpm's but twice and those times i went to 7.5---top speed attained was 135 (i could have went a little faster--didnt want to--oem safety gear and I had some really good track times. Guess i was driving 8/10? Certain sections 9/10. Testing stuff.
I will return 1st part of May!
Hope a vid soon.
OD

california style

MM....but it wasn't a competitive event, it was a UK RX8 club event where everyone had fun.

When I did the same course "seriously" on an open day for all cars, I came second, behind a full sprint prepared Elise who knew the course and had track slicks etc. I beat a few 911s, a TVR Tuscan, and a bunch of other stuff.
Happy now, or still randomly offensive?

PS OD sounds like fun at Roebling

Bastage

iTrader: (1)

Nice man! Those Elises are quick little cars. We have a few stock ones that show up at events here in FL, and they're usually some of the fastest overall.

Have any videos of your autocross laps?

california style

no not that day, as it was just a few of us. I took a vidcam this time, but stupid camera went wrong.... 8(

zenrx8

iTrader: (4)

Has anyone had their coolant temp sensor go **** up, and if so, what problems did you notice.

If you've never had this problem, what would you expect to see in a car that has a bad coolant temp sensor in terms of starting and fuel mixture.

Brettus

iTrader: (2)

I missed plugging mine in after an engine rebuild once .
Engine would not start . Plugged it back in - engine started .

Weird

swoope

iTrader: (5)

135?

sounds like you were 7/10s on the straight! and i bet real real fast everywere else, just saying.

wait, i have to figure out the 09 tranny + you sc.. dude.. i hope you have a beers or two in may. got lots of questions for you..

beers

dannobre

iTrader: (3)

It will run in open loop...really rich

Or go into limp mode and not really run at all

Should start fairly normal..it's open loop anyway...but it could flood easier..and likely not run well after a few minutes of idle

zenrx8

iTrader: (4)

Thanks B. Sounds very, very familiar.


Rich enough to make you think there was a manifold leak when you were stopped at a light?

MazdaManiac

iTrader: (3)

Random? No. Offensive? Probably.

A vacuum leak makes it run lean (and add a bunch of positive fuel trim).

zenrx8

iTrader: (4)

Exhaust manifold leak, not intake.

MazdaManiac

iTrader: (3)

Oh. Sorry.

Exhaust leaks only affect the trim if they are before the O2 sensor and fairly major.
If its not loud, it probably isn't doing much to your closed-loop operation.
It won't affect open loop at all.

zenrx8

iTrader: (4)

Thanks. I don't have an exhaust leak, it just smells like it. When the car is stopped at a light even with the windows up, cabin fills with fumes. I had the manifold and gaskets replaced along the entire exhaust, still had the stink. Now the car won't start and is pumping more fuel than the motor can handle. I've been deflooding it all winter but no luck. Starts, tries to catch, then dies.

Before I pull it down the street I'm going to replace the coolant temp sensor; it may have been crapped out all along. Any other ideas at this point are more than welcome.

olddragger

iTrader: (3)

stuck injectors?

Good luck with this dude, i know its a pita.

Well after some thought i have decided to finish my system out in a wrinkle paint finish---stay tuned.
OD

olddragger

iTrader: (3)

heres a little vid from RR--i was playing around. the S2 was tracked prepped and the driver was good.
if i stay in 5th down the straight longer then that is a sign that i was pushing a little harder. I was experimenting with lines and gears a lot.
sorry the mic is the pits at speed
the long left handed turn is a 105-110 mph turn--my favorite off all turns!
http://www.vholdr.com/node/80364
OD