09 cobalt ss/tc using stock boost control on external gate

black06g85 · 03-25-2009, 07:14 PM

anyone have any experience with this. I've been playing with the airload tables and am slowly getting it where I like it. Just need to keep the wastegate closed at lower rpms, any tips?

black06g85 · 03-26-2009, 06:18 PM

no one, guess we're going MBC then.

Baldturbofreak.com · 03-27-2009, 09:44 AM

Run an 8psi spring in the gate.
Set the airmass as per stock. At least the shape anyway. you can make small overall boost level changes here but make sure that the shape remains the same or you'll have overboost issues/wildly changing boost.

Then use max air torque and cater it to your turbo's charicteristics.
No boost below 4K? better make your Max air torque reflect that or you'll get an underboost code.
Slight overboost at high rpm? trim it with the max air torque table.

Biggest thing is to make sure you run a 8psi sprign as per factory.

black06g85 · 03-29-2009, 06:49 PM

thanks man, yeah I need to try that I guess. Car is on a 8lb spring right now. Too bad I didn't see this earlier had the car on the dyno this afternoon and it was pissing me off lol. Kept closing the Throttle up top though, can't figure that one out as of yet.

Baldturbofreak.com · 03-29-2009, 07:49 PM

It got a 38mm or a 44?

black06g85 · 03-30-2009, 05:19 AM

38mm Turbosmart gate.
was going to an absolute TPS of 69% above 6300 rpm. No matter what I changed it still did the same shit.

Baldturbofreak.com · 03-30-2009, 07:37 AM

Post some logs. I'll have a peep. maybe a torque table was missed?
Or the gate is having difficulty controlling boost on the top end and the pcm is closing the throttle to prevent overshoot?

black06g85 · 03-30-2009, 05:48 PM

I think I screwed up something in the tune possibly. I'm going to start from scratch this week. Load was reading weird, it was rising then dropping off after 5700rpm down to @72% it was also a little choppy. I dunno, I'm new to the LNF PCM. I'll get the hang of this animal though.

black06g85 · 03-30-2009, 05:48 PM

btw I could email it to you as I'm not posting it up on here.

black06g85 · 04-01-2009, 05:33 AM

Thanks for the advice, swapped out to a dual stage MBC last night, re tuned. 22 psi, car is an animal. Can't wait to get it back on the dyno. No more throttle closing which is fantastic.

03-25-2009, 07:14 PM	#1
black06g85 Senior Tuner Join Date: Jul 2006 Posts: 242	09 cobalt ss/tc using stock boost control on external gate anyone have any experience with this. I've been playing with the airload tables and am slowly getting it where I like it. Just need to keep the wastegate closed at lower rpms, any tips? __________________ mods= turbonetics HiFi 60-1 ball bearing t3/t04E Hahn Racecraft Intake manifold Hahn Racecraft FMIC 4.5" core custom hot and cold side hard piping 79lb/hr injectors vulcan equal length tubular manifold 3" turbo back TiAl 38mm wastegate newly built motor, more to come soon
	Location: New York, New York

03-26-2009, 06:18 PM	#2
black06g85 Senior Tuner Join Date: Jul 2006 Posts: 242	no one, guess we're going MBC then. __________________ mods= turbonetics HiFi 60-1 ball bearing t3/t04E Hahn Racecraft Intake manifold Hahn Racecraft FMIC 4.5" core custom hot and cold side hard piping 79lb/hr injectors vulcan equal length tubular manifold 3" turbo back TiAl 38mm wastegate newly built motor, more to come soon
	Location: New York, New York

03-27-2009, 09:44 AM	#3
Baldturbofreak.com Senior Tuner Join Date: Jul 2007 Posts: 611	Run an 8psi spring in the gate. Set the airmass as per stock. At least the shape anyway. you can make small overall boost level changes here but make sure that the shape remains the same or you'll have overboost issues/wildly changing boost. Then use max air torque and cater it to your turbo's charicteristics. No boost below 4K? better make your Max air torque reflect that or you'll get an underboost code. Slight overboost at high rpm? trim it with the max air torque table. Biggest thing is to make sure you run a 8psi sprign as per factory. __________________ Me love boost long time.
	Location: Honeoye,Ny. Boondox son. Shoot guns out my back door. noone cares.

03-29-2009, 06:49 PM	#4
black06g85 Senior Tuner Join Date: Jul 2006 Posts: 242	thanks man, yeah I need to try that I guess. Car is on a 8lb spring right now. Too bad I didn't see this earlier had the car on the dyno this afternoon and it was pissing me off lol. Kept closing the Throttle up top though, can't figure that one out as of yet. __________________ mods= turbonetics HiFi 60-1 ball bearing t3/t04E Hahn Racecraft Intake manifold Hahn Racecraft FMIC 4.5" core custom hot and cold side hard piping 79lb/hr injectors vulcan equal length tubular manifold 3" turbo back TiAl 38mm wastegate newly built motor, more to come soon
	Location: New York, New York

03-29-2009, 07:49 PM	#5
Baldturbofreak.com Senior Tuner Join Date: Jul 2007 Posts: 611	It got a 38mm or a 44? __________________ Me love boost long time.
	Location: Honeoye,Ny. Boondox son. Shoot guns out my back door. noone cares.

03-30-2009, 05:19 AM	#6
black06g85 Senior Tuner Join Date: Jul 2006 Posts: 242	38mm Turbosmart gate. was going to an absolute TPS of 69% above 6300 rpm. No matter what I changed it still did the same shit. __________________ mods= turbonetics HiFi 60-1 ball bearing t3/t04E Hahn Racecraft Intake manifold Hahn Racecraft FMIC 4.5" core custom hot and cold side hard piping 79lb/hr injectors vulcan equal length tubular manifold 3" turbo back TiAl 38mm wastegate newly built motor, more to come soon
	Location: New York, New York

03-30-2009, 07:37 AM	#7
Baldturbofreak.com Senior Tuner Join Date: Jul 2007 Posts: 611	Post some logs. I'll have a peep. maybe a torque table was missed? Or the gate is having difficulty controlling boost on the top end and the pcm is closing the throttle to prevent overshoot? __________________ Me love boost long time.
	Location: Honeoye,Ny. Boondox son. Shoot guns out my back door. noone cares.

03-30-2009, 05:48 PM	#8
black06g85 Senior Tuner Join Date: Jul 2006 Posts: 242	I think I screwed up something in the tune possibly. I'm going to start from scratch this week. Load was reading weird, it was rising then dropping off after 5700rpm down to @72% it was also a little choppy. I dunno, I'm new to the LNF PCM. I'll get the hang of this animal though. __________________ mods= turbonetics HiFi 60-1 ball bearing t3/t04E Hahn Racecraft Intake manifold Hahn Racecraft FMIC 4.5" core custom hot and cold side hard piping 79lb/hr injectors vulcan equal length tubular manifold 3" turbo back TiAl 38mm wastegate newly built motor, more to come soon
	Location: New York, New York

04-01-2009, 05:33 AM	#10
black06g85 Senior Tuner Join Date: Jul 2006 Posts: 242	Thanks for the advice, swapped out to a dual stage MBC last night, re tuned. 22 psi, car is an animal. Can't wait to get it back on the dyno. No more throttle closing which is fantastic. __________________ mods= turbonetics HiFi 60-1 ball bearing t3/t04E Hahn Racecraft Intake manifold Hahn Racecraft FMIC 4.5" core custom hot and cold side hard piping 79lb/hr injectors vulcan equal length tubular manifold 3" turbo back TiAl 38mm wastegate newly built motor, more to come soon
	Location: New York, New York