Bnr k04-gt28
10-02-2010, 09:30 AM
#126
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I'm guessing that even with a twin scroll setup, this will probably be hitting full boost at 3200-37. Also, you guys are going to be losing some torque too. That is my guess. 400whp is a possibility before running into the DI fueling problem, even if Vince from Trifecta has found a work around. Someone needs to unlock that **** already. Guys i think I would be happy with 400whp if I still had my SS/TC. What is the point of more in a FWD car. Think I should ditch the GLi and get a Sky Redline with this upgrade????
10-02-2010, 12:46 PM
#127
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With the fueling GM stage sensors trifecta and hp hybrid tune this thing should be a pretty good deal for that kind of money , I mean it's a great happy medium for me .. Less money and less to deal with .. Bolt ons are just ideal for simplicity.. Should make a great street setup ...
10-02-2010, 04:47 PM
#128
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im not sure about losing torque. It will just come in later in the powerband which is a good thing. Too much torque down low you tires and clutch going bye bye
10-02-2010, 06:09 PM
#131
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exactly. you might be able to get away with the stock clutch with this turbo. I have a 50 trim on. Around 400 wtq but the torque comes in late as **** so no clutch slipppage.
10-03-2010, 02:09 AM
#132
With the fueling GM stage sensors trifecta and hp hybrid tune this thing should be a pretty good deal for that kind of money , I mean it's a great happy medium for me .. Less money and less to deal with .. Bolt ons are just ideal for simplicity.. Should make a great street setup ...
10-03-2010, 06:08 PM
#134
yea i was .. apparently the stock tensioner on the 2.4s doesn't like the 2.55" pulley i'm running so i'm trying to get a new bracket so i can use the lsj belt setup and it'll run.. however the bracket is 2 weeks or so out .. soo now i'm not boosted.. and idk if i'll even stay boosted after i get the bracket just cuz i'm so annoyed with it.. the car sat for a good portion of this year because of stupid belt / tensioner issues.. now if i go to a larger pulley it's no problem but a larger pulley wont give me the power i want lol 
you have NO idea how depressing it is going from a ~300 whp and 250 wtrq to a ~160 whp and 145 wtrq car is lol i'm still running all my **** from when i was boosted.. just no belt to put the blower in play.. lol sooo ***** weak right now lol
you have NO idea how depressing it is going from a ~300 whp and 250 wtrq to a ~160 whp and 145 wtrq car is lol i'm still running all my **** from when i was boosted.. just no belt to put the blower in play.. lol sooo ***** weak right now lol
10-03-2010, 09:35 PM
#135
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yea i was .. apparently the stock tensioner on the 2.4s doesn't like the 2.55" pulley i'm running so i'm trying to get a new bracket so i can use the lsj belt setup and it'll run.. however the bracket is 2 weeks or so out .. soo now i'm not boosted.. and idk if i'll even stay boosted after i get the bracket just cuz i'm so annoyed with it.. the car sat for a good portion of this year because of stupid belt / tensioner issues.. now if i go to a larger pulley it's no problem but a larger pulley wont give me the power i want lol
you have NO idea how depressing it is going from a ~300 whp and 250 wtrq to a ~160 whp and 145 wtrq car is lol i'm still running all my **** from when i was boosted.. just no belt to put the blower in play.. lol sooo ***** weak right now lol
you have NO idea how depressing it is going from a ~300 whp and 250 wtrq to a ~160 whp and 145 wtrq car is lol i'm still running all my **** from when i was boosted.. just no belt to put the blower in play.. lol sooo ***** weak right now lol
Oh wow, yea I know how it feels. Imagine going from a SS/TC with every bolt-on and tune(totaling that) and going to a VW GLI with 157whp 168wtrq. Blows donkey *****. I thought that you were turbo not SC. I have a friend of mine with an 8th gen that was thinking about going SC but I convinced him to go turbo. What do you think? PM me!
Anyway, on with the thread.....
10-04-2010, 04:25 PM
#136
Senior Member
Updated
Update
Hello all.
I had a custom stainless wastegate bracket drawn up to fit a Garrett universal actuator on the BNR LNF stage 2 and 3 units. The stock crack pressure on the factory LNF turbo is around 7 psi. If you have boost drop happening up in the top RPM, the stock actuator is part of the problem (other problem is the turbine wheel which is taken care of in the upgrade line up).
There are 2 actuators of choice. .5 bar- 1.0 bar (7.35 psi-14.7 psi) base pressure and then 1.0 bar- 2 bar (14.7-29.4 psi) base pressure. Typically most people choose the 1 bar and set it to 1 bar then use a boost controller or solenoid to up the boost beyond the base set pressure.
I also threw in a pic of the stock compressor wheel comparison. Stock is to the left, middle compressor is the 2860 and the 2871 on the far right.
I had a custom stainless wastegate bracket drawn up to fit a Garrett universal actuator on the BNR LNF stage 2 and 3 units. The stock crack pressure on the factory LNF turbo is around 7 psi. If you have boost drop happening up in the top RPM, the stock actuator is part of the problem (other problem is the turbine wheel which is taken care of in the upgrade line up).
There are 2 actuators of choice. .5 bar- 1.0 bar (7.35 psi-14.7 psi) base pressure and then 1.0 bar- 2 bar (14.7-29.4 psi) base pressure. Typically most people choose the 1 bar and set it to 1 bar then use a boost controller or solenoid to up the boost beyond the base set pressure.
I also threw in a pic of the stock compressor wheel comparison. Stock is to the left, middle compressor is the 2860 and the 2871 on the far right.
10-04-2010, 04:38 PM
#138
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https://www.cobaltss.net/forums/4339369-post15.html
From another thread:
That is an interesting question. Like I said, I am still learning the tuning thing. I learn by doing it on my car, and thats why the MBC went on. I wanted to see the effects and stuff of it.
As far as I can tell, this is what happened on mine (with the MBC)... What an MBC does is reduce the amount of boost pressure the wastegate actuator sees. This in turn slows the response of the wastegate, which was giving me erratic boost, since the car was guessing what would happen next. It was not odd for me to see 30+ psi (scary, really). There are other ways of achieving this, and there are also other types of boost controllers. This is something I am still learning (got a book beside my bed right now, lol). Some other type of MBC may be better for the LNF, or there may not be a good one for the LNF.
But, I really don't know the answer to your question. I am sure Vince uses wastegate control on his tune, so the computer is still controlling it. I just don't know how reliable this is on the stock sensors yet. A local friend of mine has the infiniboost, and it seems to run well. I need to get back out and do some logs on his car, and compare them to mine again. I only got one log last time, and its not enough.
As far as I can tell, this is what happened on mine (with the MBC)... What an MBC does is reduce the amount of boost pressure the wastegate actuator sees. This in turn slows the response of the wastegate, which was giving me erratic boost, since the car was guessing what would happen next. It was not odd for me to see 30+ psi (scary, really). There are other ways of achieving this, and there are also other types of boost controllers. This is something I am still learning (got a book beside my bed right now, lol). Some other type of MBC may be better for the LNF, or there may not be a good one for the LNF.
But, I really don't know the answer to your question. I am sure Vince uses wastegate control on his tune, so the computer is still controlling it. I just don't know how reliable this is on the stock sensors yet. A local friend of mine has the infiniboost, and it seems to run well. I need to get back out and do some logs on his car, and compare them to mine again. I only got one log last time, and its not enough.
Last edited by PrincessTurbo; 10-04-2010 at 04:53 PM.
10-04-2010, 04:54 PM
#140
If we had access to the WG tables, we could switch to a cheap fast interrupt style solenoid, which builds boost much faster. It makes a huge difference for bigger turbos, though I would not really call the GT28 hybrid a big turbo. I think it'll be a very good match actually. 350-375 at the wheels without generating a ton of heat is perfect.
10-04-2010, 05:00 PM
#141
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Well as far as I can tell it will be a 2871 You will need A hybrid Trifecta and HPT tune on top of a stage tune with the GMS1 Sensors. Vince will program the requested waste gate tables fueling etc and you do the rest.
10-04-2010, 06:29 PM
#142
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Should be ok with GMS1 sensors and Trifecta tune. All the Trifecta/HPT tune does if give HPtuners owners the ability to tweak some the stuff in the Trifecta tune. Though a Trifecta/HPT tune would probably yield better results due to being tuned more aggressive then what Vince does.
10-06-2010, 10:31 AM
#143
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You guys think it would help?
10-07-2010, 01:02 PM
#148
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zzp is not as prestigious or that great of a shop as people on here make them to be. I'll never buy their SH@% products again. Plus, customer service is Horrible.
10-07-2010, 01:12 PM
#149
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im not gonna bash zzp hard but i will say a friend of mine bought the stage 3 and they tuned it wrong 3 times even after i did a data log and vince told me what they needed to change and wouldnt do it
10-07-2010, 01:22 PM
#150
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