FlewByU352

I just dont get some people when they build their 1.6 or 1.8 they put a big turbo that doesnt spool till 5500 and with shitty gearing it takes them forever to get there. Why? Its just dumb to have the turbo spool so high IMO with long gearing and a final gear that puts you out of boost when you shift lol. I've seen so many Honda owners do this I really dont get it.

azandford

because they dont know what they are doing or working with leftover parts

accord99power

agree+2

TypeRfit

iTrader: (6)

It all depends on the setup, a friend of mine is running a gt35r on a 2Ltr gsr, yes it does spool a little slow, full boost around 5200rpm, but from there to 9500rpm that thing rips and does not fall out of boost when shifting. I do agree that there is overkill on some turbos, but if the builder/tuner knows a little something about turbo setups you can actually run a decent sized snail.

Schister66

Yes, some people are stupid. I'll give you that. To address your actual concern however, those of us with Honda B series engines, dont have the option of large displacement. In order to build a setup that makes 400whp or so, we have to run a large turbo but that doesn't mean it has to be slow spooling or slow in general. Even though our engines are small, they are remarkably efficient which allows us to run larger turbos with better success than a comparable Evo, WRX, DSMpoop, etc.

Even my own turbo setup by your definition is laggy and dumb, but i can tell you that although the graph shows full boost seems to be about 5k, it starts coming on much earlier and with a bit of brake-boosting, i can have full boost at a hair over 3k rpm.

The biggest thing to remember is to match your turbo to your setup and goals rather than just going by what everyone else says or by what is popular at the time. I was just posting in a thread where the OP wanted 315-365whp and the first suggestion was a GT35R...really?!? Thats where people start acting in accordance with your original claims.

Here's my graph for comparison...not my final graph (which is lost) but one of the random pulls along the way

FlewByU352

I have a B18C-R. I understand to get to the higher HP goals you need a bigger higher flowing turbo. I'm saying people that take a stock LS and throw a 57 trim on it. The LS doesnt rev that high to begin with and the gears are long. The turbo doesnt spool until 5500 of so. I know another guy with a LS/VTEC I saw him run it the other day. He takes off and its so slow eventually the turbo spools and it spins the tires. IMO the only thing thats good for is drag racing with slicks because all of the power is so high up. I think people think the bigger the turbo you have on your DD the cooler you are. In your case your stillmaking over 200HP @ 5k. Thats not slow.

Turbo_TONY

what 57 trim doesnt "spool" untill 5500???????
I had a t3/t4 57trim on my stock ls before i built it and threw a vtec head on it. It hit 8psi around 4500rpm.

Also, the guys using larger turbos ARE doing so because they drag race. Your not going to put a 35R on a circut car.

I do agree that there are those people who just want a "DD" with a large dyno number. There are those that just get too large of a turbo to meet their goals i.e Schister66's example. They are usually misguided and/or uninformed.

SIXTY-1HATCH

Alls I know is my 57 trim hit full boost by 3-35k on my bone stock ls motor, it was bad ***!

Other than that, there is NO way to answer this. EVERYONE is diff., and do **** for diff. reasons. I run a 2.0l gsr with a gt40, yea it doesn't hit boost till about 52ish. Think about it though, when drag racing @ what point does your car go under maybe 6500? Not sure about you guys, but I'm on the gas and shiftin my *** off, and I don't drop out of boost. That is the point for the big turbos, TOP END, with out them you would't be seeing the #'s that everyone is doing. For a DD or circuit track, yea it's just dumb, but some people have to have the best of the best. I mean I don't own a trailer so I drive my car to the track and back, and enjoys night and weekend cruisin with it, and honestly I would rather have a laggy turbo on the street. Why would you want to be spinning and boosting that low in the r's? Mine drives like a normal all motor car, unless you wake her up and hit the gas....

Bottom line is, everyone is diff., and everyone has diff. goals. I think now a days though you see more and more of kids using daddy's money or what not, and they buy what the big boys run, just to be cool.

GEN2 LS

iTrader: (3)

I agree! we all know b16's are gutless below VTEC lol, so I wanted to just increase where it already shines which is 5700rpms and up! my t3 housing 60-1 .63 hotside was hitting full boost around 5,500ish but my rev limiter was set at 9,300. its a nice powerband for the highway, as I try not to fool around on local streets. I don't think I picked the wrong turbo, I ran a 50 trim previously before the 60-1 and it got down no lie, 3,500rpm full boost till redline at 8500 but the top end tapered off. It just blew the tires off as well. I hardly take my car to the track, its my daily driver and just something to have fun with and **** of the occasional m3, ZO6 or Cobra haha:p

turbociv910

this is going on a 81mm b16.



JK

GEN2 LS

iTrader: (3)

what's it going on?

Boosted-EH-804

singlecam

turbodailydan

my b18c-r (fully forged) running 57trim hits 1.2bar around 4.8k rpm on a street car i find this just right. not too laggy and power doesnt drop off between gear change. i see alot of people run massive turbo's on street cars and all they do is light the tyres up whenever they hit boost, big turbo's can be good as long as the car has the right setup ie not just thrown a gt40 something on a stock ls

Abraham-ATS

iTrader: (1)

i run a big turbo bc its for drag race apps i come out the line at 7800rpm i rev til 10,200 and my motor doesnt go lower then 7500 on any gear... if i show one of my data logs youll see boost in evry gear...

if its for the streets stick w/ something that makes you feel the spool @ 3000 rpm like a GT30R or so....

turbociv910

2.0

GEN2 LS

iTrader: (3)

sleeving the b16?

turbodailydan

agree

Bailhatch

RPM is the reason. 1.8 liters at 8000 rpm is like 3.6L at 4000 rpm. A stock b16 with a medium sized turbo is making noticable power over stock by 4000rpm. You have another 4-4.5k rpm of good power after that. Hugely oversized turbos are silly, yeah, but a ~60lb/min turbo can be really fun on a small engine as long as you have good gearing, which GSRs and B16s come with.

If you fall out of boost with the typical honda setup between shifts then you are shifting about 3000 rpm too early.

Personally I can't stand a small engine with a small turbo on a fwd car. Traction is important and without some road speed you just cant hook up a t28 on high boost without slicks. On rwd small turbos on small engines is a blast though

LightningTeg

Im rolling a GT28r (the turbo that comes with the Dseries edelbrock kit) on my LS and its the best DD turbo ever. Its instantaneous full boost at any rpm above 4500 and will make the wastegate (10psi) @ 3400rpm from a slow start.