Brettus Turbo install thread
12-02-2008, 07:26 PM
#226
6800 -7300rpm
8.0 - 8.5 psi
960-970 C exhaust
AFR - could be over 12
15 - 17 degrees advance - hard to pinpoint the exact number but it will be in that range . Split was around 14 degrees but not sure as I dont have that map to look at .
Here is the full map . Numbers on the far right are the base map numbers . Numers in the square are the modification to the base map .
so for 7000 and 7.4 psi we have 20-3= 17 degrees
green square is the one I think i was in - or half way to the next square on the right .
8.0 - 8.5 psi
960-970 C exhaust
AFR - could be over 12
15 - 17 degrees advance - hard to pinpoint the exact number but it will be in that range . Split was around 14 degrees but not sure as I dont have that map to look at .
Here is the full map . Numbers on the far right are the base map numbers . Numers in the square are the modification to the base map .
so for 7000 and 7.4 psi we have 20-3= 17 degrees
green square is the one I think i was in - or half way to the next square on the right .
Last edited by Brettus; 12-02-2008 at 09:09 PM.
12-03-2008, 01:35 AM
#227
your exhaust temps are very hot. are they measured with a thermocouple or from some other source?
the consensus on ausrotary.com is in the 800deg c range is the zone for reliability measured at the ports pre-turbo. if you only have one probe measuring both rotors then you can have an averaging effect and one could be 800 the other 1100 and you get 970.
the consensus on ausrotary.com is in the 800deg c range is the zone for reliability measured at the ports pre-turbo. if you only have one probe measuring both rotors then you can have an averaging effect and one could be 800 the other 1100 and you get 970.
12-03-2008, 01:45 AM
#228
980°C is hot, but not unusual for a rotary.
Its not unusual for a high-output street rotary to see pre-turbo EGTs as high as 1100°C!
I wouldn't expect a motor to live very long if you sustained those sort of EGTs for any duration beyond a couple of seconds.
Cruise EGTs on a bone-stock RX-8 can be as high as 820°C.
I regularly hit 980°, but that is at 14 PSI, not 6.
That said, your ignition timing is pretty retarded.
Especially above 6500.
Its not unusual for a high-output street rotary to see pre-turbo EGTs as high as 1100°C!
I wouldn't expect a motor to live very long if you sustained those sort of EGTs for any duration beyond a couple of seconds.
Cruise EGTs on a bone-stock RX-8 can be as high as 820°C.
I regularly hit 980°, but that is at 14 PSI, not 6.
That said, your ignition timing is pretty retarded.
Especially above 6500.
12-06-2008, 01:27 AM
#236
That's about what mine looked like.....bit of carbon on the ends...and a bit of oilly stuff on the barrels that wiped right off.......about the same mileage too...and lots of track time
The old " redline a day" thing seems to hold out for carbon. Problem seems to be in the seals though
The old " redline a day" thing seems to hold out for carbon. Problem seems to be in the seals though
12-06-2008, 11:28 AM
#239
Administrator
iTrader: (7)
brett: good to see the engine out, going to a good rotary rebuilder?
12-06-2008, 02:01 PM
#241
Sorry to hear about this.
Are you going to use the mazsport coils with the rebuilt engine?
Personally, I'd have recommended going back to the oem coils, and keeping boost to 9 psi for that kit. It's just not efficient enough to work well above that. High IAT spells trouble.
12 AFR wouldn't necessarily mean blown engine.
Are you going to use the mazsport coils with the rebuilt engine?
Personally, I'd have recommended going back to the oem coils, and keeping boost to 9 psi for that kit. It's just not efficient enough to work well above that. High IAT spells trouble.
12 AFR wouldn't necessarily mean blown engine.
12-06-2008, 02:15 PM
#242
/\ well I'm not blaming the coils at this stage but yeah - that is another uncertainty ......
I would like to figure out what psi will give me the lowest IATs at 7000-7500 but the flow map cant really tell me that because i'm off it no matter what pressure i run
I would like to figure out what psi will give me the lowest IATs at 7000-7500 but the flow map cant really tell me that because i'm off it no matter what pressure i run
Last edited by Brettus; 12-06-2008 at 02:18 PM.
12-06-2008, 02:25 PM
#244
good question
here is what i was thinking so far
*run 9-10 psi up til about 6200 then let it drop off to about 7psi from there on . I know that can work .
*Look into getting something to measure IATs
*Fit larger primary or secondary injectors and run a lot richer higher in the rev range
*Advance the ignition 3-4 degrees and montor EGTs
*make sure i dont push the car when it develops a misfire
here is what i was thinking so far
*run 9-10 psi up til about 6200 then let it drop off to about 7psi from there on . I know that can work .
*Look into getting something to measure IATs
*Fit larger primary or secondary injectors and run a lot richer higher in the rev range
*Advance the ignition 3-4 degrees and montor EGTs
*make sure i dont push the car when it develops a misfire
12-06-2008, 02:33 PM
#245
Administrator
iTrader: (7)
you forgot:
* throw mazsport coils in the trash
* throw mazsport coils in the trash
12-06-2008, 02:45 PM
#246
So what you're doing is keeping the boost up till you're out of the danger zone then decreasing the pressure... doesn't sound like it's going to do what you think it will.
*Advance the ignition 3-4 degrees and montor EGTs
right
12-06-2008, 02:46 PM
#248
12-06-2008, 02:57 PM
#249
everything I've read says it's the peak torque that you have to worry about detonation the most, the low and upper rpms are fine. Which is why Jeff's maps go rich in the 5.5k range, and leaner above and below that point.
So what you're doing is keeping the boost up till you're out of the danger zone then decreasing the pressure... doesn't sound like it's going to do what you think it will.
So what you're doing is keeping the boost up till you're out of the danger zone then decreasing the pressure... doesn't sound like it's going to do what you think it will.
1/at aux valve opening when running higher boost - this kinda points to the leaning off causing the misfire
2/Above about 6800 when at higher boost
Everything below this in the rev range was fine even when I ran 11 psi one time
12-06-2008, 03:01 PM
#250
Administrator
iTrader: (7)
Not bashing but at this stage in the game, it doesn't make sense to reinstall the Mazsport coils.
- dwell settings have been questionable for certain FI applications
AND
most importantly, what if a coil goes bad, ignitor freaks out? How is he going to replace that? Might as well install something where replacement parts / support is more readily available.
- dwell settings have been questionable for certain FI applications
AND
most importantly, what if a coil goes bad, ignitor freaks out? How is he going to replace that? Might as well install something where replacement parts / support is more readily available.