Well i been thinking it over and over and i don't know what to do so here im, want advise but only from knowleageable people. If i want to keep stock internals for like another year or so and i want to get to 285whp. Do i really need my gt28rs or can i do it with the stocker. And if people boost 14psi on gt28rs whats the most i could boost on the gt25 with halteche6x?
GT28rs or stock Turbo
- Thread starter MSPLIFE
- Start date
shane02pro5
25ish_psi
- :
- New Caney TX
Your saying you want to keep the boost down for now but want the turbo to be able to get to that power level after the motors built right!?
Joka1 ran 22psi on the stock turbo for a long time before blowing the motor. May try and get some info from him.
Joka1 ran 22psi on the stock turbo for a long time before blowing the motor. May try and get some info from him.
4
43975
You already have the GT28RS in leave it. The Stock turbo is ok but not a great unit. If I absolutly had to run the stock turbo again, It would have to be that was rebuilt by MPNick with the GT28RS internals.
Isn't the stock unit rated for 300 HP? You'll have to almost max out the gt25 to get the numbers your looking for. Your RS is rated to 350. BTW boosting 14 PSI with the GT28RS on stock internals expect the motor to last about one race. 10 PSI on the stocker is just about equal to 6 PSI on the GT28RS. With stock internals I would n't be comfortable boosting more then 7 psi with the bigger turbo. I hope that helps some.
Are you looking to use the stocker because of the boosting issues we've talked about on the other thread?
Isn't the stock unit rated for 300 HP? You'll have to almost max out the gt25 to get the numbers your looking for. Your RS is rated to 350. BTW boosting 14 PSI with the GT28RS on stock internals expect the motor to last about one race. 10 PSI on the stocker is just about equal to 6 PSI on the GT28RS. With stock internals I would n't be comfortable boosting more then 7 psi with the bigger turbo. I hope that helps some.
Are you looking to use the stocker because of the boosting issues we've talked about on the other thread?
4
43975
I think Joka had a mutant engine!
no really, i just figure if i only want 270 or so for now the stocker but i mean a brand new stocker should be fine right? b-c when i built the motor i want something bigger than gt28 like a turbo capeable of holding 450+whp. i have the new t25 ready, but i dont know if to replace the gt28sr yet
shane02pro5
25ish_psi
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- New Caney TX
Definately but I ran 13psi on my VF-22 around 250whp before my built motor.
Mazdaspeed2oo35
600whp - 600wtq at 30 PSI
You really don't want a turbo that spools too fast, main reason is your transmission, the faster your turbo spools, the faster and more risk you are running to break your transmission. First of all you need to know what exactly you want out of your car, you want to be fast red light to red light, or you want to be fast and keep up. you can't make your car, fast, with a very responsive turbo and keep up in top end and not break your transmission. if you want to have a fun car use a small size turbo, if you want to be fast and be more competitive in high RPM use a GT28RS or GT2871, but if you want to make real power, and be real fast in mid and top end and make big numbers you need to move to a mid size turbo, GT3071, or GT35R or similar turbos, it all depends what you are looking for, but to be safe and good no matter what turbo you use, you need to Forged your internals, Weld your LSD and or get Stronger 3rd and 4th cryo treated gears and some good clutch.. this is just my .02
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shane02pro5
25ish_psi
- :
- New Caney TX
You are pushing beyond the limits of the block for sure at 270. I had a J&S knock sensor at 250whp that held things together.
My vf-22 is a little smaller than a 28rs.
The point is the bigger the turbo the more lag you will have which is good for stock tranny and block but it's powerband will be higher in the rev range. So you won't get much until past 3500rpms+
My vf-22 is a little smaller than a 28rs.
The point is the bigger the turbo the more lag you will have which is good for stock tranny and block but it's powerband will be higher in the rev range. So you won't get much until past 3500rpms+
Mazdaspeed2oo35
600whp - 600wtq at 30 PSI
very well said Shane, i rather in my case to make power a little later, and keep up in top end, than having a very fast spooling turbo and run out of breath in top end, also less chance to break the tranny while making power on higher speed, rpm and gear.. my setup makes power from 3.9k all the way to redline, and stays on full boost on every upcoming gears.. is all about what you want and are looking for in a car, i love to make power in mid to top end, and keep up with other fast cars, but i also know people like to have a very responsive turbos setups for like red light to red light races...
Mazdaspeed2oo35
600whp - 600wtq at 30 PSI
if you want to race on High RPM you'll need something bigger than the Stock unit, the GT25 spools very, very fast, but also runs out of breath fast in high rpm. they are both fast spooling turbos just that the 28RS makes more power and hold it more than the Stocker in high rpm. the best in my consideration turbo in the 28 family is the GT2871R, is the fastest spooling in its category and makes power through the whole power band. just remember all turbos are made to make certain amount of power and psi efficiency range.
shane02pro5
25ish_psi
- :
- New Caney TX
The gt2871 or similar is probably what I will be going to next.
4
43975
What are your current mods so we can help you figure out how to get to your goal?
with:GT28rs,Vibrant Exhaust with delete cat,Perrin FMI with open HKS BOV,
Walbro fuel pump,All 4 motor mounts,SRI with AEM dryflow filter,and A/F SplitSecond with the Super Stock map i made 240whp.
Right now i got rid of the FMI and undesided about ion FMI or just stocker with methanol. And also got rid of the split second for the halteche6x but still no install. And then the turbo, that don't know if i should change.
In my plans i have t25 at 12psi so the engine dont suffer to much like 10psi from the gt28rs, also haltech with 440ccs injectors tune, 505s intake mani, my new stock turbo mani ported, and 3'' S n J pipes. And the mystery of ION FMI or methanol with stock SMIC. I think that i should easily hit atleast 260whp with this.
Walbro fuel pump,All 4 motor mounts,SRI with AEM dryflow filter,and A/F SplitSecond with the Super Stock map i made 240whp.
Right now i got rid of the FMI and undesided about ion FMI or just stocker with methanol. And also got rid of the split second for the halteche6x but still no install. And then the turbo, that don't know if i should change.
In my plans i have t25 at 12psi so the engine dont suffer to much like 10psi from the gt28rs, also haltech with 440ccs injectors tune, 505s intake mani, my new stock turbo mani ported, and 3'' S n J pipes. And the mystery of ION FMI or methanol with stock SMIC. I think that i should easily hit atleast 260whp with this.
shane02pro5
25ish_psi
- :
- New Caney TX
MSPM1cheLe
DRVRMOD
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- 2010 BMW 135i
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