Gt2859R-9 Vs Gtx2860R Response

[GT-R David]

Does anyone have experience with adjustable cam gears on the original cams.

Any suggestions on a value to start with?

[GT-R David]

Just a small update, maybe it's usefull for someone in the future.


I bought the -9's and got them fine balanced. I don't have a dyno graph yet because it was just mapped on the street, but I'm very happy with them. Full boost (1,45 bar) is at 3900-4000rpm with Tomei cam gears in stock position until now. Will adjust this on the dyno in the near future and see what it will do for better spool, I'm sure this will bring some extra response and midrange power.


I really like it, that I get the same boost earlier than before. 1 bar was at 3800rpm before, now it's 1 bar at 3500rpm.

Edited September 10, 2015 by GT-R David

[sneakey pete]

I ended up going down the gtx path but I've yet to install them.

Did you balance brand new turbos or were they second hand?

[GT-R David]

Yes, they were brand new. Heard the balancing from Garrett isn't the best.

[Piggaz]

Really?

From who?

[GT-R David]

The Garrett balancing is max of 1g up to 30000rpm and max 2g after that.

Mine are balanced to max 0,2g now.

Can upload a chart of the balancing if someone is interessted.

Wasn't that expensive, so thought I maybe won't feel a difference, but won't harm.

[Hadouken]

When you get it on the dyno can you give us a before and after....?

[Hadouken]

When you get it on the dyno can you give us a before and after....?

[GT-R David]

This for example is what a normal balancing diagram looks like:

The balancing from factory is anywhere below the big line.

I attached a picture of one of mine now

You can see the big line on the left corner. The balancing should be anywhere below the line to meet the manufacturers specification.

I think you won't feel a difference at all. All they say, the Turbos last longer with a better balancing.

This is how the biggest Garrett dealer in Germany discribes the Garrett balancing:

Garrett balanced the core assembly of the GT-R and GT-X turbocharger according to appropriate guidelines in a reasonable and cost-efficient framework. This balancing is usually sufficient. If it's not enough for you and you want a more exact balancing for your turbocharger, we can perform this for you. The costs for this is 130EUR. The work delays the delivery of your turbocharger to a maximum of one working day.

[GT-R David]

When you get it on the dyno can you give us a before and after....?

Before and after adjusting the cam gears?

Yes I will.

[STATUS]

Before and after adjusting the cam gears?

Yes I will.

Before and after adjusting the cam gears?

Yes I will.

should be a big difference, the inlet cam really responds well to adjustment on the RB26

[Hadouken]

Before and after turbo balancing

[GT-R David]

Before and after turbo balancing

No, as they were balanced brand new and are one the car now.

And as I said before, I'm sure there won't be a noticeable difference from fine balancing.

[XGTRX]

Very interesting. I wonder to what level the local guys go when they rebuild turbos?