Interesting Map JB,

I've did some dyno testing way back when and lost *a ton* of hp up top with that kind of advancement. Always made the most power with zero advance. Is that map with an exhaust cam gear?

However I've never to this day tuned S2's. I don't see how those cams would be so drastically different than others though.

Are your findings on the dynojet or on the street?

 

but that is the 9 turbo with the 10.5 hotside. Would you think that the IX turbo may be a little more equal at higher RPMs with the larger compressor housing?

 

JB,

Did you notice better performance with this mivec map over the one you posted in this link:

https://www.evolutionm.net/forums/sh...ighlight=mivec

I've never tried negative advance in the idle range. What effect did this have on your idle? Did you notice that it's better to have some mivec advance in the upper rpm range or no advance at all?

 

Bryan,

These are based on the S1 dynos we have done recently, and then using my dyno sim software for 24hours straight at every 500 rpm to determine max hp at XXX advance while maintaining duration. Then I backed it up on the street and at the track. I run 119.7 on 24psi on pump for a reason

The S2's have something like 4 variations though and the centerlines arent the same, so one set might not make as much power as these do at XXX advance. Add to that the level of boost, timing, and type of fuel I am running and there are probably somethings that work for me that dont work for others. I agree with you though that it should be close.

As I recall I thought when you ran those tests on 91 it didnt show any gains though as it was relative to timing? Perhaps I misrecall though I am not sure. I had thought way back when that if it had been done on 92-93 there was more timing that could be run with more advance. Hard to say which caused the power increase. I do know however that on stock cams we found something like 9whp with more than 0* advance on Bob's dynojet. At our next dynoday I will bring my car out and dyno for once and we can see what completely zero'd does versus this map.




That map was for cosworths which have an entirely different engineering profile and require a different strategy from what i have found. The M3 is the only Cossie set that I have found that really likes any amount of advance more than that map. I believe that one was the plain jane 272 (prior to the M2) though I could be wrong.

 

so getting back to stock cams ehehe

do we need to reduce our MIVEC advance over 200load and say 3500rpm?

 

David, I dont see it hurting anything and most likely with a scale similar to mine no doubt (at least left to right, maybe not so much rpm wise).

 

that sounds suspiciously like "try it and let us know"

hehehe

dammit I prefer just copying other ppls work!!! :P

 

David, when I get a chance I will send you a version for the stock cams that I have

I was going to lead you in the direction, but since I like you I'll hook it up.

aaron

 

Yeah, you're definitely a copy-cat. :-)

 

Dave, I've got to get on the dyno next week to make sure the tune is right for my 1050s', so I'll play around a bit with the mivec maps and see if I can get any distinguishable benefits.

 

Cool dudes

I will try and come down this time Jibbed!

I filled up with Vpower (not racing) and now my timing seems good again... I am thinking my local servo is filling the 98RON tank with 95RON...

 

LOL - Okay!

Sucks re: the fuel - That's so dodgy - but I've heard that happen before...

BTW - Looks like VPower Racing is done and finished (100RON fuel - 94-95ron for you guys in the states). The last station I know of (in Richmond) has replaced it with E10.

I'm going to tune the car for Boost 98 (E10 93RON fuel for the rest of you) and see what I can get!

Cheers,
matt

 

Go ahead and post up that stock cam map JB :-)

Good Info here , This weekend Iam going to try 21 vs 28.8 @ peak and see if it fells any diff .

 

Is there a way of determining whether I have the Cossie S2 or M2? I've had the cams for about a year now and I know they are 272/272 but not sure which version. What is the difference between the versions

In the meantime I've replaced my mivec map with yours and will run a log to see how they compare. The comparison will be on 91 octane which is what we run on here in cali.

 

S2=GSC

Cossies are 272/272

the newer M2 (I am thinking this is what you have if its within a year) are also 272/272 with some revamped profiles.

The M3 is a 280/272 combo


...and the stock turbo version...well a girl has to have her secrets