Please Help Me With My Very Lazy Gt2860-9's!

[sydking]

Greedy profec b

[sydking]

There's one in fs section for 300 odd

[tommis85]

Greedy profec b

Yep I've been checking them out...there're also some newies on ebay for $220-370. They look easy enough to install too which is great!

[Dajae]

I can vouch for the Greddy. On my previous setup I had one holding boost dead-straight for my HKS GTRS @ 20 psi. Can't remember when full boost was achieved, but it was scary responsive.. Boost would fluctuate between 19.8 - 20.7 psi when on full song. (According to boost gauge)

[Hadouken]

I can vouch for the Greddy. On my previous setup I had one holding boost dead-straight for my HKS GTRS @ 20 psi. Can't remember when full boost was achieved, but it was scary responsive.. Boost would fluctuate between 19.8 - 20.7 psi when on full song. (According to boost gauge)

is 6k rpm scary responsive?

[XKLABA]

is 6k rpm scary responsive?

I think you'll find he had it as a single setup on a RB25, so yes VERY responsive

[iplen]

Don't rule out timing, the front of the exhaust cam can get chewed out and timing will move 10-15 degrees.. Tends to be less consistent though, will go like a shot one day and a bucket of crap the next.

[Don Dada]

Don, I think I have about 10mm now...the outer end of the actuator just touched the boss that the flapper shaft/spindle passes thru. You'll see what I mean when you check yours

Checked mine and the outer end of the act sits just before the middle of the pin giving a measurement of hole center on the act to center of the pin about 7mm.

So basically with 9psi acts with less preload, we have about the same response......EBC time!!

And these turbos were proven time and time again, and as a matter of fact seen some really shitty response times for -7s as well on paper too, so its just a matter to tweaking to get them up to scratch so dont worry

[Hadouken]

I think you'll find he had it as a single setup on a RB25, so yes VERY responsive

Ah. Apologies

[tommis85]

There appears to be different understandings of response here....

1. The initial time it takes the turbos to spool up from idle speed during take off, and,

2. The time / delay for max boost to be achieved when you're in the turbo's working rpm band, above say 4000 etc. Eg, when you're on the track, holding 4500 around a corner and then power back up for the exit.....example 2.....you're at 4.5k, you put flat down, how long does it take to make full boost = level of responsiveness.

What we "should" be talking about in this thread is No.1....how long it takes for the turbo to get everything going hard from idle rpm. I guess it shouldn't reeeeealy be called "response" just by itself...maybe initial spool up time would be a better way of putting it :P

And yes, big singles can be very "responsive" up top when there're plenty of fumes going round....but I don't think you can beat the responsiveness of small twins or the stockers. When you're up it they on max in a split second - awesome on the windy roads

[Hadouken]

My 9's love the twisties. When are you getting the final tune and stuff?

[tommis85]

Checked mine and the outer end of the act sits just before the middle of the pin giving a measurement of hole center on the act to center of the pin about 7mm.

So basically with 9psi acts with less preload, we have about the same response......EBC time!!

And these turbos were proven time and time again, and as a matter of fact seen some really shitty response times for -7s as well on paper too, so its just a matter to tweaking to get them up to scratch so dont worry

Haha I see...yes, I think we're going to go down that path I'm not gonna wind on any more pre-load for now....I need to see where this thing boosts to now without bleeding anything off (bleed valve is closed, may as well take it out). I reckon the 10mm on mine will make it boost to exactly 18 pounds or so - if it goes over, I'll have to wind some preload off ....ultimately I'll have to maybe wind some off again anyway so EBC can do some controlling up there as per XKLABA's recommendations.

[tommis85]

My 9's love the twisties. When are you getting the final tune and stuff?

ASAP mate. Right now I've been ganny-ing around with front prop shaft removed because tuning mob killed the front diff (somehow). Hope to have it in soon and then it's off for a tune once more

[tommis85]

My 9's love the twisties. When are you getting the final tune and stuff?

...also, there's the EBC....wondering if I should just putter around some more and get that as well before tuning

[tommis85]

That's good that they're good in the twisties....I had a brief taste of how they come on before backing off (needs tune etc etc) and it looks quite promising.

[sydking]

...also, there's the EBC....wondering if I should just putter around some more and get that as well before tuning

Yes, I would think its a good idea to let the tunner play around with it and get it all set up.

[Don Dada]

Definately get an ebc before the final tune as they do need tuning and the dyno is the best place as you will see any changes on the graph, and of course tune the map to suit these changes

[tommis85]

Haha I reckon anything would look good on the graph right now....they tried to tune it with the wastegates flapping in the wind - dumbasses! I mean hell, what tuner does that? "Hmmm....turbos are laggy....lets not check for mechanical issues and crank up the boost instead" GRRRRRRRR!!!!

Right now they'd have a graph that would similar to a GT30 except a bit fatter down low...just need to have the whole show shifted forwards by another 500rpm and then I'll be a happy chappy!

So what are your plans Don? Do you have any graphs? Mine was so pathetic that I didn't take a copy....it's flat and gay and would just remind me of when I spent all that money for nothing

[tommis85]

Am quite motivated now...just came back from a drive that had a highway stretch in it where I loaded them up a bit in 3rd up a hill.....expected just the normal low boost but they instead ramped up to what would have been (I backed off) around 16psi at 4000 Can't wait to get it tuned so that she'll ramp up like that in the lower gears too!

[linkems]

tommis85: with your foot pump hooked up what pressure did the wastegate start to crack open? how much preload have u dialed in (1 full turn is equivalent to 0.8 mm) and as a result what is your peak boost.

Cheers