Squirtin EGsr

whats better to do ?

SiRkid

k20 but itll be the most expensive (cost of motor+ turbo ****)

bang for buck=b18b.(unless you score a good deal on a b18c)

ek4hatch

b series turbo!!

Rod.

if it is all up to money...b18b turbo....if you have it coming out your ***....k20 turbo

STHPERFORMANCE

I'd say the k20. I've read the K20 head flows better then a S2000 head and tested better then a ported b16a head..

Also, I'd do a K20 just cause i seen one make 301whp @ 6psi at honda-day. Pretty impressive for only 6psi

However a k20 is going to cost u a grip more of cash, You could save that money and invest it into a Built Ls turbo and make as much if not MORE hp. So either way u look at it you'll end up with a nice setup

joek84

go with the b18, use the money saved on building it

ritalin

Ls turbo definitely. I like tq so that rules out k20 and gsr.

Tinker219

k20 seems to be damn near matching hp and tq. If $ is no object(or if you have a lot ), K20...

XDEep

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ekhatch00 &raquo;</TD></TR><TR><TD CLASS="quote">Ls turbo definitely. I like tq so that rules out k20 and gsr. </TD></TR></TABLE>

uh.. nm.

System-7

doesn't really matter IMO. your pretty much changing and all-motor engine into a turbo setup. You will encounter the same problems whether b-series or k-series. oh and that 6psi could have been made with a t67/t66 big turbo. Drop a t25 into that k-series and i will make 300whp at 15psi. Just wanna correct all you guys that think PSI makes the same power for all every turbo. My ls/vtec turbo made 317whp at 9psi with an Innovative GT35killer 9:0compression and stock b16cams. IMO k-series turbo is not worth getting because they pretty much do the same thing. Just because its a new engine doesn't mean its better for turbo. If it were all-motor i'd be a different story.

White Smoke

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redturbocivic &raquo;</TD></TR><TR><TD CLASS="quote">if it is all up to money...b18b turbo....if you have it coming out your ***....k20 turbo</TD></TR></TABLE>
He's right
BUT if you have the money than no doubt get the k20 built and boost that thing.

boosted92

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ekhatch00 &raquo;</TD></TR><TR><TD CLASS="quote">Ls turbo definitely. I like tq so that rules out k20 and gsr. </TD></TR></TABLE>

LS stroke = 89MM
GSR stroke = 87.2MM

That's a 1.8MM difference. 0.07 inches. If you think you're going to notice that, or if you think that is going to make a 20+ ft-lbs of difference in torque, I hate to break it to you but you arn't. If someone swapped your LS block for a GSR block and changed nothing else and didn't tell you that they changed out your block, you wouldn't notice it.

Zakar

then how do you explain why you can't rev a ls past 6750 when a gsr is 8k factory?

that 1.8mm must make a difference

boosted92

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MusclecarGuyhasHonda &raquo;</TD></TR><TR><TD CLASS="quote">then how do you explain why you can't rev a ls past 6750 when a gsr is 8k factory?

that 1.8mm must make a difference</TD></TR></TABLE>

You're kidding, right? This isn't serious, you don't actually belive that, do you?

If you are serious, i'll explain why the LS doesn't rev as high. The LS is a more mild motor. It has a non-vtec head which does not flow as well, and cams with less lift and duration. Because of the poorer flowing head and less agressive cams the LS does not make power past 6750 so they don't rev higher than 6750. If you port and LS head and throw in some bigger cams or do an LS/VTEC conversiont he motor will rev well past 8000.

MachAF

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ekhatch00 &raquo;</TD></TR><TR><TD CLASS="quote">Ls turbo definitely. I like tq so that rules out k20 and gsr. </TD></TR></TABLE>

umm.... NO

Zakar

so then why do they say it isn't SAFE to spin the ls past 6750?? using your logic i could spin it to 8k.... it just wouldn't make power there..

rusteds2k

It's true that the k20 produce more power and it will produce more power than any b series at a giving psi. But the cost of that will be almost the same as building a strong bserie block that can handle more psi.
So with the same amount (not always true) of money, you can make alot more power with an LS or GSR since a built block can handle more boost than a stock k20 with boost. Therefore, I would build a b block and boost the hell out of it. And it would be cheaper to replace also.
Try boosting a stock k20 at 17-20psi. and then try boosting a built ls block at the same amount. Let's see which one will bo BOOM first.

95GSRTT

i rev my stock internaled LS to 7400 all the time, and my dyno will show you that i would continue to make power a hell of a ways past that also.

I think your confusing FI with all motor. All motor, sure the LS MAY not make HP much higher up in revs. FI is completely different. Also the LS doesnt have the cams/springs or retainers to continue to rev really high. Thats another reason why you cant rev as high as the GSR or Type R.

b16sedan

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MusclecarGuyhasHonda &raquo;</TD></TR><TR><TD CLASS="quote">so then why do they say it isn't SAFE to spin the ls past 6750?? using your logic i could spin it to 8k.... it just wouldn't make power there.. </TD></TR></TABLE>

What are you trying to say? Who says that it isn't safe to spin it past 6750, and who is "they".

FWIW, I helped build my girlfriend's LS/VTEC setup, running a stock block with a Z10 girdle, ported ITR head, toda C's, bunch of valvetrain upgrades, skunk2 IM, DC header and 2.5" apexi n1 she's spinning it to 8500 DAILY and has been doing that for 8 months and over 10 thousand miles.

LS/VTEC having a poor rod/stroke ratio to spin it up = myth.

XDEep

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16coupe &raquo;</TD></TR><TR><TD CLASS="quote">
LS/VTEC having a poor rod/stroke ratio to spin it up = myth.</TD></TR></TABLE>

engineering = incomprehensible

blackpearlgsr29

got a ? i have a clean 99 si with gsr motor and trans built head ctr cams stock bottom. i got this guy wantin to trade me a 98 ek hatch with a k20a2 with some bolt on's and the 6 speed trans. what do yall think should i trade him the 99 gsr/si for the 98 ek k20a2?

CanadianEF9

if the car its self is as nice as yours then i would deffinately do it and if they did a good job swapping the motor in

Tony the Tiger

I would personally choose a B-series over a K20. It's simply due to the tuning options available for the B-series (ECTune, Neptune). For a K-series, you are stuck with expensive standalones.

Glove

also no one has mentioned that B-series tranny's are far stronger than K series ones.

Go B series just kuz its so cheap, and makes so much damn power.

K series for bling.

hybrdthry911

edit: just realized thread was old

the LS rods werent made to spin higher, more precisely the rod bolts are the bigger weakness. people use stock bottom ends all the time with arp rod bolts to spin the higher rpms of a GSR.

the MYTH behind LS motors making more torque than VTEC engine is that they dont make any top end power. so when you have the 2 exact same turbo setups both with a goal of 300whp. you have to push the turbo setup harder(lets say 3 psi higher) on the LS engine therefore making more midrange to get the same top end power of the VTEC setup. now push that 3 psi higher on the VTEC engine and you make the same torque and a lot more power than the LS engine.

also lets not forget with a higher rev limit you can gear the car down more to multiply that torque even higher. so even if the LS made 15% more torque, which it doesnt as i showed above, if you rev 25% higher guess what? you can still make more torque to the actual wheels if you geared the car down 25%.