darkstarrskata

I have a JDM GSR and I am currently in the process of upgrading the engine internals so that I can run my GT42R Turbokit.

Now I was going to go with Brian Crower Stage 2 Turbo Cams because it said it was for turbo. But I read into it and it has very aggressive lift and shorter duration for more back pressure. But I hear with this setup you lose high end power.

And i see plenty of people running Stock CTR, GSR and ITR Cams at nearly 700+

But my question is which would be the best?
I dont want to make a decision yet until I know.

I hear Skunk 2 Pro's 1 are good for a turbo set up. But I just cant be sure I want to get the most that I can out of this.

Also would you recommend me boring valves 1.0mm over to lower compression even more? or just .5mm? or just stay stock?

And valve springs, Valves, ti retainers, guides and seals. Which are the best springs for a turbo set up depending on cams for max power without cutting into lower end? ANd what about valves? I guess the rest are brand preference?

sanman000719

.5 s2p1 cams also man

what fuel you planning on using

sanman000719

im on supertech springs

darkstarrskata

Fuel wise I was just going to get injectors off of jhpusa.com

But I really haven't researched about fuel systems too much.

One thing my buddy has been trying to talk me into looking into is running E-85, but I'm not sure where you can get that or what it takes and I would have to search the pros versus the cons.

Muckman

iTrader: (2)

How much valve spring pressure is recommended for the S2P1 cam?

Gold DA9

Sanman was taking about type of fuel. 93, E85, etc...

darkstarrskata

I was going to just run 93 octane in it. I would like to run E85 eventually though. I just have to read into it more

Schister66

This doesn't appear to be the best plan so far. You have found a large turbo, but the rest of your setup seems to be lagging behind. To make use of the turbo, there are a certain few things you need to consider. Just grabbing a set of injectors off a website shows me that you haven't really put a ton of thought into this. Maybe you should slow down a bit and research what a proper setup utilizing a GT42r should entail...or ditch that turbo, get a smaller turbo and go about your business. Lower power setups don't require much, if any forethought

darkstarrskata

okay well I'm going for atleast 600hp. So i dont know if that helps with much. I've been thinking about going to a GT37R

racebum

have you given any thought to the traction or transmission concerns you're going to face?

i don't really see how 600hp could be too hard since there are a variety of ways to get their just reading about existing builds. imo cams could be a last thought once you get the combo together and dyno it with your existing cams, if you actually need more then go from there.

darkstarrskata

Yeah, I've got the transmission and everything else I need for the build. All I really need now is the turbo kit and some random here and there parts. Although I was looking at a site for turbo's and I wasn't sure if anyone had used it before. Have you guys heard of usedturbos.net? They have some pretty decent looking stuff. But as I am starting to read more and more about turbos I am starting to realize that I really have no idea what I'm looking for. Because I don't know what turbo's for my engine will give it at least 600hp. And I don't know what all the specs for turbo mean. Like I know I'm going to take it to Mason Engineering for the tuning because I have no idea how to judge the Fuel/Air ratio. I can do all the work and the bolt -ons and everything.

racebum

best bet is looking around and using what's worked for others. gringoteg that has another thread here in the FI forum put down 550 to the wheels, that's basically what you want. if i remember right he's using a precision 6262 to do it, check his build thread

i had the same problem when i first got into this. i was like wtf turbo works to make a 300whp daily driver itr...seemed simple but getting one that actually had a great powerband was a little harder. what's this AR **** do i wondered, well, lota research, pms and dyno charts later i found a great fit with the precision 5031e which wasn't even close to the first turbo i was looking at

boosted_teg10

i have SK2 pro 1s and love them they ate every bit of the 6lbs i was running on my wastegate spring up and i made 308hp and 238 t ....they love boost i am about to go back to the dyno to set up my high boost tune i should be seeing 475 or more on pump gas dont want to go over that really because the fuel wont hold up... my set up if wonderin is a ls block sleeved 84.5 mm bore with 10.0.1 pistons GSR stock ported head with ferra valves crower tt spring and ret and sk2 pro 1s the turbo kit it a peakboost 57 trim garret turbo & ram horn mani with 3inch exhaust and has a sk2 pro series intake mani and 70mm TB with a gsr trans hope that helps

kyden

475 isn't happening on a 57 trim.

darkstarrskata

boosted_teg, yes that actually helps me out quite abit. I'm still going to do alot more research for turbo's based on HP goal.

boosted_teg10

its a 57 housing thats been bored out to a 60 now with a billet wheel but, that was my goals before the change in the turbo so we will see and did u not see what i made on 6 psi J/w plenny of room for growth i feel anyway but only way to see is to try it tho so u may be right ill let ya know