MIVEC and high boost
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?
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?
Since we are going to revisit this, Bryan was that the Cosworth and Stock...or any cams? I have always found the opposite, but even then I think we are talking about peak versus overall smoothness of the powerband. I lost 1/2mph with zero on the S1's and immediately gained it back when I re-upped the advance to to 6.6*...the S2s do not seem to be any different.
While I cant totally explain how I know, Martin said WAY back in the day that some advance had helped them when running staggered profiles (not totally the same thing I realise as what we are talking about).
While I cant totally explain how I know, Martin said WAY back in the day that some advance had helped them when running staggered profiles (not totally the same thing I realise as what we are talking about).
Since we are going to revisit this, Bryan was that the Cosworth and Stock...or any cams? I have always found the opposite, but even then I think we are talking about peak versus overall smoothness of the powerband. I lost 1/2mph with zero on the S1's and immediately gained it back when I re-upped the advance to to 6.6*...the S2s do not seem to be any different.
I added advancement up top on a E85 Evo 9 with M2's and the car dropped 10 whp and the peak hp curve flattened out.
On another E85 Evo 9 with FPgreen I tuned last month I gained approx 12whp from actually using negative Mivec up top (-1.8), although this was with a Exhaust cam gear as well.
I actually tried this out yet again today. I don't really want to revisit this as everyone has their own techniques.
I added advancement up top on a E85 Evo 9 with M2's and the car dropped 10 whp and the peak hp curve flattened out.
On another E85 Evo 9 with FPgreen I tuned last month I gained approx 12whp from actually using negative Mivec up top (-1.8), although this was with a Exhaust cam gear as well.
I added advancement up top on a E85 Evo 9 with M2's and the car dropped 10 whp and the peak hp curve flattened out.
On another E85 Evo 9 with FPgreen I tuned last month I gained approx 12whp from actually using negative Mivec up top (-1.8), although this was with a Exhaust cam gear as well.
TIA
So I am wondering if we dropped MIVEC to zero at peak power and started reintroducing it back into flatten the hp drop back out? We'd end up with all sorts of odd dips but if its what it takes it might be worthwhile.
By revisit maybe I should have said reread...and then I would mean me
By revisit maybe I should have said reread...and then I would mean me
The car feel dead afterwards , looking at the boost I see why . It made my GM bcs act like my old mbc quick peak to 25psi and quick drop to 20psi .
So less cam timing = less boost at same wgdc .
Iam going to keep screwing around with it and see whats up
.
I did drop the advance down after peak to around 20 vs 28.8 this weekend .
The car feel dead afterwards , looking at the boost I see why . It made my GM bcs act like my old mbc quick peak to 25psi and quick drop to 20psi .
So less cam timing = less boost at same wgdc .
Iam going to keep screwing around with it and see whats up .
The car feel dead afterwards , looking at the boost I see why . It made my GM bcs act like my old mbc quick peak to 25psi and quick drop to 20psi .
So less cam timing = less boost at same wgdc .
Iam going to keep screwing around with it and see whats up
.
The problem with changing MIVEC tune is it is the foundation of the rest of the tune so it could throw off timing and fuel. Make sure you adjust the whole tune when you change the MIVEC.
