I’m going to build a 2.0L ls motor for boost and I was wondering what turbo I should use. This is somewhat a serious build since I plan on sleeving the block. What do people think about the T4’s? I’m not saying that’s what I want, but just wondering if anyone is using one and why. I’ve heard of some people using straight t4’s. I know most people use t3\4, but with what trim do you recommend for my specific build. And is it possible to use a gsr water pump and oil pump on a ls build? I’m not sure if that’s a dumb question, but I want to just upgrade with honda parts if possible. I know people use them with ls\vtec, but I haven’t put much thought into using it on just a b18b. I didn’t think it would work, but I thought I’d ask. I’ve decided to just build the ls and use extra money for the turbo down the road. I’m still keepin’ my gsr head just in case I run across something to do with it. Thanks for any help and I did search, but I still want specific answers. Thanks for any replys.
Garret GT28rs or GT2871R. very fast spooling ball bearing turbo.
just out of curiosity what are your reasons for sleeving the block?
i’m just looking for a forum to share a few ideas and thought this might be a good place for it. (i.e. stock sleeves don’t fail because of psi level) 
btw…with a 2-liter setup i’d recommend probably the GT3071R. The GT28 series will spool insanely quick, possibly too quick for good traction in 1st and 2nd. along with that you’ll be slightly less limited on what you can accomplish numbers-wise with the larger gt3071R.
here’s some compressor maps. at 2.0L straight LS, you’ll be around 37lb/min airflow and 2.2 pressure ratio (i’ve done plenty of compressor map math in the last couple years so i’m fairly well-versed) at redline, and at 50% redline you’ll be around 28 lb/min. So keep those points in mind when looking at the maps:
GT28RS (disco potato):
GT3071R:
If you’re set on one of the GT28 series, at least get one of the larger a/r (.86) setups. I’d be happy to share some dynos of the GT28RS and GT2871R showing how they lose efficiency around 5500-6000 rpm’s on 2-liter(ish) setups at around 350-400 hp range. (and they’re even off of VWVortex :))
thanks for the pics…,but I don’t know how to read airflow maps. I’m still checking them out and I’ll most likely go with a larger trim. That does seem to be an appropriate turbo though. I’m still learning all the turbo stuff, so bear with me. I’m not worried about the stock sleeves, but I did want to have more options in the future with this motor. I just like the idea of a b20 and want one, but cylinder walls are weak…so I’m making my own b20. Do I want a fast spooling turbo or one with a little more top end?
we’re not the ones you should be asking. 
good call mark, I first suggested the gt30 but edited and said the gt28rs/2871r. reason being that hondas dont have any torque as it is and your going to want to get something that spools quickly to make up for it, rather than takes for ever than hits hard, late.
to tell you the truth, I would go with the GT2871R (which is actually what I will be going with on my Jetta) because it will still spool quickly, but has the ability to make power at higher RPMs.
I guess you’re right lol. I want one with massive pull, but I was referring to the b18b motor mainly. I wanted a good turbo for the motor and that’s why I asked if I should get one with top end or not. I’m trying to get the best of both worlds if possible, so I’ll look into the gt2871r. There is a turbo cam out there right? How are they? Thanks for the help.
i would recommend the rocket motorsports L21 cams over the crower turbo grind. they have less lift, but more duration. the reason the LS head dies off as you get higher in the revs is because of lack of breathing. more lift doesn’t help with that as much as more duration in the higher revs. obviously if the valve is open longer it’ll allow more air in. 
there’s lots of info about LS turbo setups on evans-tuning.com 
i highly recommend you check out that site. not just for LS either…tons of IMMENSELY good information no matter what you’re building.
I dont know whats out for honda’s as far as turbo cams, but marks suggestion sounds good.
I didn’t know evans tuning was boostedhybrid. I’ve been looking on there a lot. I’m trying to make a ls like the one that made 300hp on 8lbs. He said it had very good portwork and cams, so I would like to do the same. I’m also debating on the 84mm bore cause I could use the block money to save up for the turbo. I was planning on turbo sometime next year, but this way I would be boostin’ real soon. Not sleeving would fits more with my piggy bank. How far can I bore if I use the stock block? thanks again…I hate making these decisions.
doing some research…that gt30 is an expensive turbo. About as much as sleeving the block.
http://www.atpturbo.com/Merchant2/merchant.mvc?
try this. GT2871R with .86 a/r
I seriously think the GT30 will be to big if your using it for a daily driver and want it to be streetable.
for the hell of it, heres my near future upgrade. (only using the gt2871r instead)
V-Band is the shit 
There was a T60-1 G2 running 36PSI on his LS/VTEC. it did very well( this was a straight drag car). don’t know if you want to take it that far. I don’t know what your goals are?
What was the theory behind (stock sleeves don’t fail because of psi level) I remember reading it and found it very interesting…cant find it…if someone knows where this topic is email it to me or just post it here…sorry for taking your trend…
Thanks Mark…
Not to steal the thread but im trying to boost my LS as well and im pretty new to the turbo learning process.Now ive heard that anything that is smaller than a T3 spools to quick to make any power at top end and the t3-t04 has too much lag but is good at high rpms.So what about a SC34?Whats the comparison?
read the turbo guide, then start looking at compressor/turbine wheel specs.