Hks2835 Tune

[DaveO74]

What size rear is the op running to achieve the 290kw?

I'm about to order one of these but am unsure whether to get the .6 or .8 rear

[bcozican]

hmmm ...must be 0.87 then def not 0.68 yes its laggy for rb22 but good for drift at barbs

sorry to hijack thread OP ..lol

[Harey]

What size rear is the op running to achieve the 290kw?

I'm about to order one of these but am unsure whether to get the .6 or .8 rear

My understanding is the op is running a 0.68 exhaust housing. joeyjoey runs the 0.68 rear and makes 280kw on 98 and 320kw on E85.

I would definitely recommend the 0.68 for a good combination between response, mid range and peak power. I think the 0.68 is the default option in the rb25 kit anyway.

[75coupe]

yep its the .6 housing for sure...

here are the dyno charts, if anyone has any critic please comment...

Havnt had a good drive of it yet, but it feels good and thats the main thing.

and this time I got rmp, power & afr, easier to read.

[wolverine]

Boost control still looks like a bit of an issue but its making good power at 4000rpm.

I would expect it to be a bit crisper and slightly earlier coming on boost and a little flatter holding your set level.

[75coupe]

Boost control still looks like a bit of an issue but its making good power at 4000rpm.

I would expect it to be a bit crisper and slightly earlier coming on boost and a little flatter holding your set level.

I agree, any ideas on what could help the response and get a flatter boost line?

I expected it to ramp up smoothly and a tad steeper.

and whats with the dip at 4800-5400rpm???

[joeyjoejoejuniorshabadoo]

still looks a lil lazy getting onto boost... can you crank the gain up at all with the PFC boost kit?

i have a blitz dsbc spec S with the gain set to full and i see 20psi just before 3500 with the HKS 1 bar actuator

it trails off to just under 18 by redline, but i'm not worried as its safer that way and it's only a ~5rwkw difference

midrange and getting the party started sooner is where it's at

[joeyjoejoejuniorshabadoo]

there's always going to be a slight dip just after you hit full boost... nothing really to worry about.... have a look at my graph at around 3500

i'll try to find a run on a dyno dynamics somewhere for an easier cross reference

[joeyjoejoejuniorshabadoo]

this is an incomplete tune @ my previous tuners from the day we installed the turbo

it does however show a slightly more similar looking graph, but with more gain

[75coupe]

Yeah I want mine to come on boost like that... I'll try changing the gain and see, although its going to hard to tell the difference without hitting the dyno again, $300 for a tune touch-up yesterday doesnt exactly make me want to keep seeing improvements on the dyno printouts.

[Harey]

$300 isnt too bad, depends how long they spent I suppose.

Excellent response/midrange there, 130rwkw at 3,500rpm, 195rwkw at 4,000rpm. Yup strange dip from 4800-5400, but then a nice top end especially considering the boost is dropping.

Joeyjoeys drops about 2psi but yours is about 4. So not too bad but I agree the gain should be wound up a bit more to improve it.

Still great result and I would prob leave it as is until you come back with E85

[NickR33]

Yeah I want mine to come on boost like that... I'll try changing the gain and see, although its going to hard to tell the difference without hitting the dyno again, $300 for a tune touch-up yesterday doesnt exactly make me want to keep seeing improvements on the dyno printouts.

leave it... its pretty damn good as is... very progressive/responsive with beefy midrange... would be really nice to drive I imagine... that's gotta be the best setup for a street driven GTSt IMO

I had one making 260rwkw but had the boost dropping off issue you were having... sold it before I sorted that out, would have been awesome with another 30rwkw

[75coupe]

ok Im convinced time to move onto other things (of course checking the boost control gain first), like installing all of the CF Ive got coming, and rip through the masses of tyres Ive accumulated for destruction...

[GTScotT]

Your graph looks good now, it is however sprawled over 200rpm points so the boost response can look a little lazier than it should. I actually see it as being quite good. Nice to see the preload worked for you.

Can you check your EX cam gear setting?

Fact of the matter is, your motor is now making the power at the right intervals. Perhaps the change in cam timing has increased engine VE at lower RPM which has allowed it to accept more volume (decrease actual measured boost).

[Revspeed]

So I just got my car back from the tuners and Im not really disappointed with the results but am wondering if the dyno printout shows any issues.

253.2rwkw

HKS2835 ProS

sard 550cc

front facing plenum

powerFC with boost control kit

splitfire coilpacks

arc air intake

stock cams

adjustable exhaust cam pulley

98ULP

its disappointing that the dyno print doesnt show rpm so I find it harder to read than normal, but more experienced people may be able to see something from looking at this printout...

Does boost control look right?

Do I need the rpm indicator for more info of how the setup is performing?

Is power output lower than expected?

Any suggestions?

I did expect more peak power tbh, but Im more interested in midrange.

first of what kind of dyno is that?

how is it compare to a dynojet or dynopack?

[Harey]

Its the same format as joeyjoeys dyno so 'Dyno Dynamics'

[75coupe]

yep its on a dyno dynamics, Im keen to get home now and try the gain change

[89CAL]

Who wanted the hi red photos of the KAI? I have to take it out of the box to match some things up so can probably snap a photo, anything in particular you wanted to look at?

[75coupe]

exhaust housing, wastegate and manifold flange area... Im interested to know what they have changed??

[SimonR32]

yep its the .6 housing for sure...

here are the dyno charts, if anyone has any critic please comment...

Havnt had a good drive of it yet, but it feels good and thats the main thing.

and this time I got rmp, power & afr, easier to read.

Boost control as others have mentioned is shocking...

Ditch the Power FC boost control kit as it is junk, either install a Turbotech bleed valve for $35 which will work very well or fork out for a Blitz Dual solenoid (spec r or IDIII) so you can have multiple boost settings