12psi on turbo

[Silverspeed2015]

I am getting my motor fully rebuilt, Wiseco forged pistons and k1 rods, head being port and polished, valve job, 1mm oversized valves, titanium retainers, after i get the motor broke in if i wanted to run 12 psi boost what would should i get for it to run properly? I would be using the stock gt25 turbo, im not to fimiliar with turbo setups so i am looking for advice

 

[Boosted_Speed]

get a standalone it will save you the trouble tuning wise and you have many other options with other turbos.. you can either go with a gt28rs with a thunder manifold or get something custom made like me =)

 

[yudkib]

doing all that work for the stock turbo is an absolute waste of money, unless you want to spend like 3-4 grand just for peace of mind. ive heard of people forging after they threw a rod and stayed with the stock turbo, but theres not many people who do head work and keep the GT25. upgrade to a GT28RS and you can still run "stage 2" kind of stuff and not tear apart the whole car... you can go even bigger but then youre looking at a lot of fueling and cooling upgrades, not to mention you have to start thinking about how to strengthen the transmission.

generally my rule of thumb for an EMS is based on the turbo you want to run, i recommend split second stuff for the GT25 GT28RS and usually the T3/T4, but if you want to do like a GT3071RS then you need to go standalone.

 

[Silverspeed2015]

yeah i was going to upgrading to a gt28rs, but not right away, because the car is pretty much all stock except with an intake and samco hotpipe

 

[nvmsp]

Shop around with people who actually tune car's where you live and know how to tune. The most popular EMS is any Haltech, but the AFC will work apparently. Just make sure someone will be able to tune whatever you choose.

 

[shane02pro5]

In that case you may want to think about maybe fmic, welded lsd, motor mounts, full exhaust and injectors on top of the afc before all that unessesary stuff upfront.

 

[justanothermp5]

you may want a upgraded exhaust/intake/IC

if you forge it and put all the mods you have now back on it will be a waste, at least get all the bolt ons before forging

i didnt get any stock parts for when i went turbo, i figured it would be a waste of money, i got all the aftermarket i could, only stock part...is the turbo itself lol

 

[yudkib]

yeah you need a FMIC/exhaust and a good tune before even running 12psi on the stock block. even then its iffy. and if youre forged, its kind of doing things out of order

 

[43975]

I'm all for out of order..
My first mod on my bone stock MSP was a GT28RS!!
If your planning 12 psi and a t25 then a Split second will be more then enough. Plus you can tune it yourself with the help of others on this board, you can end up with a great solid tune. I witnessed the stock block handle 14 psi with the t25 so a solid tune with split second and 12 psi with a well maintained motor should be fine. A few stand alone is overkill for this build at the moment. You should consider a few stand alone when your fuel requirements are over the 440 injector range But I think the 440s are good for 400HP. You might want to also consider the AEM FIC. It's the closest thing we can get to a stand alone for a it being a piggyback.

 

[Silverspeed2015]

the only reason im going forged is because im getting the motor rebuilt so i dont want to mess with it later on

 

[yudkib]

are you going to do transmission work, ever? what do you want to get from it? reliability? 250 whp? 400whp? or how about a price target?

 

[MSP 2 K20]

How many of you even run large injectors with a big turbo on an AFC?
The stock ecu fights the piggyback when you run large injectors due to the map corrections on the stock ecu.

 

[yudkib]

i dont, but i plan to, and have read plenty of success stories from people who have.

 

[MSP 2 K20]

it works, but does it work well? hell no. cold start map runs pig rich. sometimes during idle the afrs bounce around from the stock ecu is fighting it. i had both piggyback and standalone on my old msp. it was built to the hilt and nothing short of a standalone made it run smooth like factory.

 

[yudkib]

just curious - what piggyback did you use?

 

[MSP 2 K20]

smt6 aka mpi, also tried unichip. both did the same thing.

 

[yudkib]

i have heard there can be issues with the unichip and (previously) the SS if not installed correctly. i think almost all of the kinks have been worked out with the SS installation.

 

[43975]

The split second is the way to go in the MSP. that hasn't maxed out the 440s. THe highest injector you can run on a split second is a 440, but really not a whole lot of us are going to need more then that anyways.

 

[Silverspeed2015]

it will be an everyday driver, the max i was looking to get was 250whp, i was going to upgrade to a stage 1 clutch, and maybe look around for a new transmission, i don't expect to go straight to 250whp though, maybe within a year. Once i am out of school i will probably want more whp out of it but for now id be more than happy with 250whp

 

[shane02pro5]

Yeah, you say that now...boost is a bit addictive