Garrett Gtx3071R

[zebra]

basically, they use an Idle air valve, super rich mixtures and 0 deg ign advance

Idle valve lets enough air in to keep the fuel burning, super rich and super retarded means the exh valve is open when it ignites.

[89CAL]

I thought I read somewhere about the missfiring.... that they didnt fire 1 cylinder out of 4 combustion cycles or something like that but cant find that info now only what your saying zebra.

Must have been dreaming that day lol.

but anyway, the only way I could see it working is having a Power FC pro with launch control (or another ecu that supports this) setting your launch control to a certain RPM and retarding the timing in those cells.... an RB will not push a turbo at idle

[R33 Eddy]

Any updates?

[scotty nm35]

I re-routed the wasegate lines on mine 2 months ago, with boost pressure helping the spring. The gtx is pushing 30psi in the midrange now, falling to 25, not bad considering the Turbosmart has a 1 bar spring. It was road tuned so I dont have a new graph but the power curve seems flat from 4k to 7.5k. Exhaust temps in the manifold are very low, I havent seen more than 700 degrees and that is on lean cruise.

Very happy with the Garrett and i'm amazed how quick it can spool to 30psi when I drop back a gear. Its absolutely silent too, great stealth setup.

[zebra]

I thought I read somewhere about the missfiring.... that they didnt fire 1 cylinder out of 4 combustion cycles or something like that but cant find that info now only what your saying zebra.

That sounds more like rotational idle

Used to help cool the engine off after a hard run

[89CAL]

That sounds more like rotational idle

Used to help cool the engine off after a hard run

I dunno where I was reading about whatever it was hey, i thought it was why the rally cars sounded so rough when they anti lag on the start lol

No idea what I was actually reading then

[Mick_o]

Missed my spot last week to get my cars final tune but hoping the end of this week the tune will be finished and ill have a dynosheet for you guys to pull apart lol i connected my rocker cover breather into my suction line and i pulled the aac valve off and cleaned that but it still didnt help my little idling bug though it did seem to make it start quicker. When i pull up at a set of lights it sits a little high around the 1100rpm zone but sometimes as high as 1500rpm but after a few seconds it drops down to 900 and from time to time it hunts up and down from 1100-600 any ideas where i should look next? Or could that be to do with the tune now since i hooked that breather line up?

Any updates?

[89CAL]

What's your AFR around the idle points?

Edited October 24, 2011 by 89CAL

[GTScotT]

C'mon Mick, I want to see it come to life already lol

[wolverine]

Missed my spot last week to get my cars final tune but hoping the end of this week the tune will be finished and ill have a dynosheet for you guys to pull apart lol i connected my rocker cover breather into my suction line and i pulled the aac valve off and cleaned that but it still didnt help my little idling bug though it did seem to make it start quicker. When i pull up at a set of lights it sits a little high around the 1100rpm zone but sometimes as high as 1500rpm but after a few seconds it drops down to 900 and from time to time it hunts up and down from 1100-600 any ideas where i should look next? Or could that be to do with the tune now since i hooked that breather line up?

A vacuum leak?

Did Jez manually check your idle? If not then disconnect the TPS and adjust the idle closer to the value set on the PFC.

[rob82]

basically, they use an Idle air valve, super rich mixtures and 0 deg ign advance

Idle valve lets enough air in to keep the fuel burning, super rich and super retarded means the exh valve is open when it ignites.

Try 30-40 degrees retard and a bit more fuel. Its the ignition event with the exhasut valve open that cause the turbo to spool. The idle valve is required to stop the engine rpm from dropping too much.

If you did nothing but retard the timing you would still get 95% of the benefit of anti lag - hence it is the most important variable.

[Rolls]

If you did nothing but retard the timing you would still get 95% of the benefit of anti lag - hence it is the most important variable.

My cold start values were f**ked on my nistune, meant zero ignition advance, I could build ~1psi in idle at 2500rpm with about half throttle.

Would get massive compressor surge and 5psi+ trying to cruise at 60kph with a 250kw highflow.

[Mick_o]

Wouldnt have a clue sorry mate lol

What's your AFR around the idle points?

[Mick_o]

Havent checked for vacuum leaks yet ill suss that out tomorrow arvo hopefully. yavus did tune it but we had this idle issue so i been tryin to fix it but not much free time atm took it for a run today and it was nearly stalling and idling bit rough worse than its ever been it runs great everywhere except for idle :@

A vacuum leak?

Did Jez manually check your idle? If not then disconnect the TPS and adjust the idle closer to the value set on the PFC.

[Mick_o]

Lol sorry harry its been long time coming mate i know haha

C'mon Mick, I want to see it come to life already lol

[wolverine]

Havent checked for vacuum leaks yet ill suss that out tomorrow arvo hopefully. yavus did tune it but we had this idle issue so i been tryin to fix it but not much free time atm took it for a run today and it was nearly stalling and idling bit rough worse than its ever been it runs great everywhere except for idle :@

I will have been smoked at Unigroup prior to the tune so leaks should have been found but I would inspect all the vacuum hoses very carefully anyway.

[wolverine]

We found a few things this arvo that need attention.

[tridentt150v]

Got my car back yesterday unfortunately i didnt get a dyno sheet because ive got a boost control issue that i need to sort out and ive also got an idling issue so the tune isnt finished yet

Yuvaz said i made 270kw @ 20psi which was a lil disappointing number wise BUT it feels unreal pulls like a freight train is very responsive and the sound is amazing!

Does anybody know where i could get my hands on some English instructions on how to setup a HKS EVC boost controller?

http://www.xspeed.com.au/manuals.php

[Mick_o]

I will second that scotty my garrett is very quiet it whistles a little bit down low and thats the only trace of it really i believe it is actually much quieter than the stock turbo

I also got a shock when i used bout 60% throttle and my gauge was at bout 18psi then i stepped on the noise pedal to bout 90% throttle and the gauge went up to near 27psi almost instantly!

I re-routed the wasegate lines on mine 2 months ago, with boost pressure helping the spring. The gtx is pushing 30psi in the midrange now, falling to 25, not bad considering the Turbosmart has a 1 bar spring. It was road tuned so I dont have a new graph but the power curve seems flat from 4k to 7.5k. Exhaust temps in the manifold are very low, I havent seen more than 700 degrees and that is on lean cruise.

Very happy with the Garrett and i'm amazed how quick it can spool to 30psi when I drop back a gear. Its absolutely silent too, great stealth setup.

[Mick_o]

Pulled my pcv valve out today cleaned it up it works fine but the rubber grommet on the other hand was stuffed when i pulled it out it broke in half Nissan want $50 for a new 1!

Getting a new rubber tomorrow but used a rubber hose that i had and dodged it up and it didnt seem to play up as much so fingers crossed its sweet when i put the new rubber in

Im getting frustrated cant get my tune done till next thursday now

We found a few things this arvo that need attention.