Any MIVEC love for cosworth cams?
#1
Any MIVEC love for cosworth cams?
Hey guys,
Just got my cosworth cams installed, and the car runs pretty crappy on my stock cams maps. I am running a GST base tune tweaked for larger injectors and using E-85.
I know for idle / cruise I need to dial out some of the overlap in the MIVEC maps. Is that alone enough for me to do a long road trip to take the car to be tuned? My current MIVEC settings are the ones from the GST base map.
Thanks for any help,
Keith
Just got my cosworth cams installed, and the car runs pretty crappy on my stock cams maps. I am running a GST base tune tweaked for larger injectors and using E-85.
I know for idle / cruise I need to dial out some of the overlap in the MIVEC maps. Is that alone enough for me to do a long road trip to take the car to be tuned? My current MIVEC settings are the ones from the GST base map.
Thanks for any help,
Keith
#2
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Yea you are going to have to dial the mivec settings way back. The cosworth cams for sure drive and idle a bit crappy compared to the smoothness of the kelfords.
Are you running cams on the stock RA turbo??
- Bryan
Are you running cams on the stock RA turbo??
- Bryan
#3
Do you think the MIVEC settings from the stock tune would help enough, or should I dial them back even further?
Later,
Keith
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For me (Dom 2.0 + Cos cams), I don't go beyond +25 or so on intake and I gradually decrease to +10 by 6500 RPM or so. As for exhaust, I'm pretty much 0 throughout the entire WOT range.
Also as a side note, there isn't much you can do for the idle mivec area since +10 is minimum for intake and 0 is minimum for exhaust. It should already be set like that for any tune you come across any ways. Just increase the idle/cruise timing, raise your idle, and adjust your fuel trims as needed to take care of the idle/cruise.
Also as a side note, there isn't much you can do for the idle mivec area since +10 is minimum for intake and 0 is minimum for exhaust. It should already be set like that for any tune you come across any ways. Just increase the idle/cruise timing, raise your idle, and adjust your fuel trims as needed to take care of the idle/cruise.
#5
For me (Dom 2.0 + Cos cams), I don't go beyond +25 or so on intake and I gradually decrease to +10 by 6500 RPM or so. As for exhaust, I'm pretty much 0 throughout the entire WOT range.
Also as a side note, there isn't much you can do for the idle mivec area since +10 is minimum for intake and 0 is minimum for exhaust. It should already be set like that for any tune you come across any ways. Just increase the idle/cruise timing, raise your idle, and adjust your fuel trims as needed to take care of the idle/cruise.
Also as a side note, there isn't much you can do for the idle mivec area since +10 is minimum for intake and 0 is minimum for exhaust. It should already be set like that for any tune you come across any ways. Just increase the idle/cruise timing, raise your idle, and adjust your fuel trims as needed to take care of the idle/cruise.
I still get a slight bit of hesitation in the lower gears when going WOT, probably from running a bit lean more than anything else. I am definitely running leaner in the upper RPM's.
The stock Ralliart turbo on stock cams was only able to hold about 16.5 psi at 6500 RPM in 4th gear. With the cosworth cams I am holding 19.0 psi at the same RPM point in 4th gear!!!
Another thing I noticed, at 80 mph, even on almost dead flat ground I am building just a bit of boost. It may have been a VERY gentle up hill slope, but on the stock cams with JDM MIVEC maps I never built any boost in that situation.
In short, I am really starting to like these cams
Keith
PS: I don't have the idle RPM defined in my maps, so I can't bump it up... can anyone help out with that one?
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well, the car is drivable now! I haven't played with ignition timing or fuel tune yet. What i did so far was to take the bone stock usdm ralliart mivec map, and pull out 5 deg of advance on the intake and 5 deg or retard on the exhaust. This gets rid of 10 deg of overlap in the cruise / low boost areas of the map. The stock usdm maps don't have any adjustments for high boost operation unlike the jdm maps, and for now i will leave them like that.
I still get a slight bit of hesitation in the lower gears when going wot, probably from running a bit lean more than anything else. I am definitely running leaner in the upper rpm's.
The stock ralliart turbo on stock cams was only able to hold about 16.5 psi at 6500 rpm in 4th gear. With the cosworth cams i am holding 19.0 psi at the same rpm point in 4th gear!!!
Another thing i noticed, at 80 mph, even on almost dead flat ground i am building just a bit of boost. It may have been a very gentle up hill slope, but on the stock cams with jdm mivec maps i never built any boost in that situation.
In short, i am really starting to like these cams :d
keith
ps: I don't have the idle rpm defined in my maps, so i can't bump it up... Can anyone help out with that one?
I still get a slight bit of hesitation in the lower gears when going wot, probably from running a bit lean more than anything else. I am definitely running leaner in the upper rpm's.
The stock ralliart turbo on stock cams was only able to hold about 16.5 psi at 6500 rpm in 4th gear. With the cosworth cams i am holding 19.0 psi at the same rpm point in 4th gear!!!
Another thing i noticed, at 80 mph, even on almost dead flat ground i am building just a bit of boost. It may have been a very gentle up hill slope, but on the stock cams with jdm mivec maps i never built any boost in that situation.
In short, i am really starting to like these cams :d
keith
ps: I don't have the idle rpm defined in my maps, so i can't bump it up... Can anyone help out with that one?
#7
55590006
The stock rom is available as a zip file here:
http://norcalmotorsports.org/users/b...M_55590006.zip
Thanks,
Keith
The stock rom is available as a zip file here:
http://norcalmotorsports.org/users/b...M_55590006.zip
Thanks,
Keith
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#9
Later,
Keith
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What I did so far was to take the bone stock USDM Ralliart MIVEC map, and pull out 5 deg of advance on the intake and 5 deg or retard on the exhaust. This gets rid of 10 deg of overlap in the cruise / low boost areas of the map.
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Right, I'm sure that is what he meant but since the stock tune he uses is already at minimum overlap during idle, I was telling him that he can not decrease any more than what it already was.