imptricer

iTrader: (1)

gsr built bottom end .010 9:1 itr cams skunk2 mani wanting something in the range of 300-350whp 350 considering if got bored with 300 and just wanted to up the boost. i want a decently quick spool but not have to run 15-20 lbs to get the power im looking for! i have searched and found really i could go both ways but i was wondering your guys opinions i want turbo that is the best for my app b/c i hate lag with big turbo's but want my powerband to keep growing so more less i really dont want a turbo designed for just top end! I am going to go with the peakboost kit with a ramhorn mani so i hope i gave you enough info to help me out thanks guys

RC000E

Seems like for that power goal that a GT28RS might be more what your looking for...it's pretty known for being the ideal street turbo for low to mid 300's. The GT3071R is definitely more turbo than is necessary for what your looking for, and you might pay for it a tad lagwise versus other options.

Then again, the GT3071R with the small turbine housing might not be bad either.... I'm bias I suppose though...I have the GT3071R with both the .84 and 1.06 ar turbine housings. They have that .63 housing I think it is. Quick spool and enough compressor to go bigger.

Turbo-charged

30r for sure. they normally make around 300 at 9-10 psi and spoolup is great...and thats on a b16.

i wouldnt put a 28 on anything but a single cam. 28s are awesome on single cams. made 273 @ 11psi this week on a stock d16 with head studs

imptricer

iTrader: (1)

why the gt28rs and not the gt2871r? whats the difference i want my powerband to be useable so lets here some different opinions! what do all of your guys apps hit full boost at post up for apps thanks

RC000E

It's really gonna be a tough call between the 28's. If you take a look at the maps, it really comes down to your engine and what's a better match. Truly the 28 is gonna be a little more responsive.....it's a tight call.

I've never had a 28, nor have I built a car for anyone with a 28. I know the 30's feel very responsive, even on a B16 like dude stated above. I also tuned a B16 with a GT3071R and the car on the street was super fast, very responsive, and pulled all the way to redline easily.

Alot of it is tune too. The car came to me running a really crappy tuned map that was using over 1 degree of timing retard per psi. I ended up adding alot more timing back in, and really didn't start pulling any until 3psi or so, then kind of pulled timing in steps instead of per psi. It woke up the thing big time.

After driving his car for a day, I knew I wanted a 30...it just seemed like a super solid street turbo with enough to still put down some serious power. I don't know man....good luck with whatever you get

imptricer

iTrader: (1)

another issue is that theres not anythign for tuning in montana i was going to have john vega burn me a chip and check the a/f with a wideband

dif betweeen the gt28rs and gt2871r???

blackntegra

Ive got a GT2871R 0.86ar on my ITR (9.3cr 1.8L stock bore)
i think it is rather responsive and spools to full boost around 4200rpm.

lo boost 8psi - 270whp
hi boost 16psi - 380whp

peaks hp near redline (just keeps climbing)

BoostnEK6206

bump

imptricer

iTrader: (1)

i dunno if i would want the .86 a/r i think i will be running the .64 becuase i want a some what quicker spool at lower rpm and more of a useable powerband no i really dont know between the two gt28's i need some help from some of you and open to opinions about the gt30 still

imptricer

iTrader: (1)

up?

fmfkid250

bigger turbos are better for your motor

imptricer

iTrader: (1)

thanks for being vague but how so? cuz u cud have huge lag. i can see for dyno pulls and top end u wud wont that.

fmfkid250

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imptricer &raquo;</TD></TR><TR><TD CLASS="quote">thanks for being vague but how so? cuz u cud have huge lag. i can see for dyno pulls and top end u wud wont that.</TD></TR></TABLE>

alot of boost on a small turbo = less boost on a bigger one...

therefore less boost less strain less heat all around better for your motor...

turbo lag is hyped to be real shitty this and that...but think about it when do you think that lag is going to effect you?......a roll race..thats it..even road racing you will be up pretty high in the rpms and spool time will not effect you

drag racing you can launch at boost and it will not fall out if you drive it correctly. I drove around a stock ls turbo with a 61mm turbo for a long time and loved it it dident get full boost till 5300rpm and i am shifting at 7100 and it never falls out...

Srt-4 guys would kill to rev to 8000+rpm

this is my advice take it or leave it but roll racing is for ******s!

imptricer

iTrader: (1)

funny part is you have a powerband of not even 2500 your setup would be a decent one if you made power and reved to 9000 thanks for your 2 cents

still the dif between those to turbo's im for sure going with the gt28 just dont know which one

fmfkid250

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imptricer &raquo;</TD></TR><TR><TD CLASS="quote">funny part is you have a powerband of not even 2500 your setup would be a decent one if you made power and reved to 9000 thanks for your 2 cents

still the dif between those to turbo's im for sure going with the gt28 just dont know which one </TD></TR></TABLE>

yea that power band sucks...you couldent do anything with that.... it only went 11.87@118 on Drag radials 2 years ago.... one of the only passes on drag radials to go 11's under 120mph (sounded like a smart *** but dident mean it that way im bored at work and trying to explain a point here)

what is it with the 2871 people I tried talking someone out of that turbo before but they got it anyway and had trouble selling it when it sucked on a b series...

whats the Cost comparison?

oscarmayer

I think it depends on what kind of driving your watning to do. the 28 will aloow spooling very quickly so it wodl be more ideal for autocrossing and off the line short drag on the srteets. it's not going to offer you the best performance your engine can do, but it does offer good spooling and responce. the 30 will give you more power for the punch, but at a cost of more lag and less bottom end. about 1500rpm + - 500rpm, so it's a good deal of a difference depending on the specs of both turbos. the 28 i believe will support up to around 375-420 hp depending on specs and the 30 can go as high as 525-600 depending on model and specs.

anyway, hope this helps some. and good luck man.

imptricer

iTrader: (1)

thanks i know imnot going to go with the gt28rs now its way to small lol

screaminvtec

i was also deciding between the 28r an 30r. After looking into boith i decided to go with the gt2871r. My goals were only to have 300-350 whp on a dd car. I wanted to make sure the car was streetable.

imptricer

iTrader: (1)

how do you like it? can you post your app and stuff when did you hit boost around

screaminvtec

its still in process of being built. I haven't driven it yet. Motor should be going in another month or so. setup though is....

84mm aebs sleeves
sp 9:1 pistions
cometic hg
b16 head with itr componets
ramhorn mani
3" dp
gt2871r
750cc injectors
victor x im
custom ic
custom icp

probaly forgot some items but i hope this will give you an idea

hondata s300

imptricer

iTrader: (1)

what hp you going for you shouldnt need 750's even with the gt28 maxed lol

screaminvtec

i'm only looking for 300-350whp. I'm only getting 750's for room to grow in the future.

imptricer

iTrader: (1)

any other opinions i mean i want a turbo that pulls good but i dont want lag i just wish i could find some gt30 setups on gsr s and find out when they hit full boost around

imptricer

iTrader: (1)

how would the gt3071r with a smaller compressor and turbine so it would not have much lag if it would hit full boost around 4 or 4.5 i would be happy i just really dont want to lose the top end either so thats why im wondering if the 30 would be fine

mike1114

iTrader: (1)

a regular journal bearing t3/t4 57 trim .60/.63 will we perfect for what your looking for and be a lot cheaper that a GT. I have plotted this turbo for my gsr and it was perfect. I rocked it for over a year. I even ran the same turbo on same motor with a .48 turbine, it was quick awesome spool, but I think it was t the point that is was just creating a lot of heat.

With that said, the smallest GT30, .63 turbine will also work perfect.

What you need to do is go up to the faq at the top, find out how to plot the numbers for your motor, and take those and plot them on the compressor maps also found in the faq or online. Then you'll know which turbo is better.