Split Ratio roller Rockers loss of power?

[L67 Calais]

Hi Mark,

So yesterday i finally got around to installing the 1.9 - 1.95 Rockers i bought off you 3 weeks ago and i was a little surprised by the lack of power gains?

Just wondering if i could have missed something as because i run FI i thought my gains would be more significant than an NA, like say around 15 rwkw?

Ive taken it for a few drives now and seat of the pants does not really feel much different

A little more power down low but a loss of top end, Is this normal and do you have any advise?

Cheers

[L67 Calais]

In fact, Definately a loss in top end. It feels like it's bleeding off boost or pulling back the timing for some reason? More loss of traction down low though.

[TI3VOM]

Did you reset the computer after installing?
What way did you install them, 1.9 on intake and 1.95 on exhaust I take it?

[L67 Calais]

Havent reset the ecu, no.

And yes, 1.95's on the exhaust side.

[wraith]

Reset the ecu and go from there

[L67 Calais]

Reset the ecu, Feels the same but it shifts better now.

[TI3VOM]

Sounds weird mate as I have the split ratio's in my N/A V6 and noticed the difference straight away, still the biggest gain from a mod that I have done.

[L67 Calais]

Mine's supercharged so i thought i would get more but alas, Not to be...

[TappetHead]

Sounds like something else is holding it back up top.
Might need to get on a dyno and check mixtures etc, maybe the fuel pump is struggling to keep up or something like that.
Doesn't make sense that it would be better down low and worse up top.

Cheers.
Mark.

[TI3VOM]

What sort of filter do you have on it?

[L67 Calais]

Sounds like something else is holding it back up top.
Might need to get on a dyno and check mixtures etc, maybe the fuel pump is struggling to keep up or something like that.
Doesn't make sense that it would be better down low and worse up top.

Cheers.
Mark.

I've been doing realtime tuning runs using TunerPro RT with The1 and there is no evidence of it leaning out at all.
The better down low part is probably due to the fact that i put a Pod on at the same time. It's only very minimal down low but absolutely the same throughout the rev range.

Got me stumped.

[L67 Calais]

What sort of filter do you have on it?

SAAS Pod Filter.

[chargedvx6]

I've been doing realtime tuning runs using TunerPro RT with The1 and there is no evidence of it leaning out at all.
The better down low part is probably due to the fact that i put a Pod on at the same time. It's only very minimal down low but absolutely the same throughout the rev range.

Got me stumped.

I've always found the splits to spread the power through the rev range more which does make the car feel more linear in it's acceleration. If you are only road tuning it can be hard to gauge genuine steps forward using only seat of the pants to tell I've found. A smaller pulley will be in order if your exhaust is modded and tuning is been done. 82mm on a stock cam should be spot on

[TI3VOM]

You fitted a pod at the same time?
what was your old setup? and is your pod enclosed??

If your pod isn't enclosed then that is what it will be.

[wraith]

You fitted a pod at the same time?
what was your old setup? and is your pod enclosed??

If your pod isn't enclosed then that is what it will be.

What makes you think it's the pod?

[The1]

I've been doing realtime tuning runs using TunerPro RT with The1 and there is no evidence of it leaning out at all.
The better down low part is probably due to the fact that i put a Pod on at the same time. It's only very minimal down low but absolutely the same throughout the rev range.

Got me stumped.

Small Correction / misunderstanding probably on my part, Closed Loop Fueling is Fine, PE fueling i can't tell as there's no wideband to go by, but you were getting retard 2-3deg (no knock counts) while WOT, so the next revision has more PE fueling as the timing should be fine.

If you want to tune the top end properly you can either fit a wideband kit and wire to the Injector Monitor line via linear output on the wideband kit or jump on a dyno and send a screenshot with afr's.

[L67 Calais]

I've always found the splits to spread the power through the rev range more which does make the car feel more linear in it's acceleration. If you are only road tuning it can be hard to gauge genuine steps forward using only seat of the pants to tell I've found. A smaller pulley will be in order if your exhaust is modded and tuning is been done. 82mm on a stock cam should be spot on

Just curious, What PSI is a 82mm Pulley? I have 10psi on it at the moment.

[L67 Calais]

You fitted a pod at the same time?
what was your old setup? and is your pod enclosed??

If your pod isn't enclosed then that is what it will be.

The old setup was standard OTR CAI with a K&N Panel.

I have placed the pod inside the lower half of the standard airbox and retained the OTR CAI so if anything it should still be getting the same cold air just more air overall.

[L67 Calais]

Small Correction / misunderstanding probably on my part, Closed Loop Fueling is Fine, PE fueling i can't tell as there's no wideband to go by, but you were getting retard 2-3deg (no knock counts) while WOT, so the next revision has more PE fueling as the timing should be fine.

If you want to tune the top end properly you can either fit a wideband kit and wire to the Injector Monitor line via linear output on the wideband kit or jump on a dyno and send a screenshot with afr's.

Sent you an email Nigel.

Cheers

[The1]

Just curious, What PSI is a 82mm Pulley? I have 10psi on it at the moment.

11.5psi from memory

[TI3VOM]

What makes you think it's the pod?

If it was setup with it just sucking hot air that would be the problem, but since the OP has got it setup the way he does, I have no idea!! lol

[wraith]

If it was setup with it just sucking hot air that would be the problem, but since the OP has got it setup the way he does, I have no idea!! lol

Lol oh boy hot air theory again.

[vn_v6]

hot air does make it go slower, i put a pod on mazda bravo ute as the airbox cracked and couldnt find one anywhere, lost power then i enclosed the pod and made a cold air induction to, not a BIG difference, but i felt it, doubt itd make that much difference though i might be wrong

[wraith]

It's a bravo ute what do you expect. Also I highly doubt it. You expected a difference and you got one. Not hard to figure out.

[chargedvx6]

Just curious, What PSI is a 82mm Pulley? I have 10psi on it at the moment.

If you are saying that you have an 87mm pulley (generic "10psi" pulley) and split ratio rockers and are seeing 10psi on the gauge there is something funny going on. Usually when going to splits from standard ratio rockers along with a free flowing exhaust you will drop at least 1psi, maybe 2. I usually fit split rockers, 82mm pulley and exhaust together for a nice all over gain