B00STED Si

hey guys, just wanted to let you know of what happened. ive been running the sc50 for a while, made 309.9whp @ 14.5lbs of boost and 204ft/lbs of torque (temp was 50 degrees and no humidity). then last week, i got the sc61 on, (52 exhaust trim) and took it to the same dyno, same tuner, and hit 297whp@15.5lbs of boost and 174ft/lbs of torque! (86 degrees and 67 percent humidity) we looked at the dyno chart and the spool time was so bad, it was hitting max boost at about 6,500rpms and ran out of rpms before it started making a lot of power. before, with the sc50 the spool was pretty bad as well about 5,200, but not as nearly bad as the sc61. I just ordered a neukin manifold, 3'' downpipe and 3'' exhaust so hopefully that will reduce the lag...but will it be dramatically different? b/c right now im running a inline pro manifold w/ 2.5" downpipe and 2.5" exhaust.

Bailhatch

damn, that **** would spool faster on a d16. Did you get a nice short runner manifold? The big exhaust should help.

hondaguyef

The exaust may be what is holding back you power but, damn......It almost seems like something is wrong. I could spool a straight To4e(.84/.70) by 5100-5200ish. I would be more than disappointed if I were you. Hope you get it squared away

Phil

mrx

don't scare me ;-)

i want to buy a SC34 but when a sc50 will spool such bad... i can't believe that...

i also think that something went wrong... i can't imagine that even a sc61 will spool that late...

what engine do you run?

RNPoo7

my sc 61 spools at 5500 on stock gsr

tthame1

The main reason its not making more power is the weather conditions, 50 degrees and no humidty vs. 80+degress and 67%humidity, thats at least 20 whp usually. Im running the same exact turbo with inline pro mani and dp on my 9.1 b16 and it hits full boost at 5500 and pulling the motor to 9000 it steadily climbs never dropping off. You have something else going on man, mine also made 322whp on 12-13 psi.

B00STED Si

yeah but im running stock head, and then stock bore 9.0:1 compression JE pistons, which isnt helping either...even with the tiny sc50 (32E) it wouldnt be fully spooled till like 5,200 or so, and its always been like that. i just ordered the neukin equal length manifold, 3'' downpipe and 3'' full exhaust, so hopefully it'll spool the SC61 by 4,500 rpms or so, which should lay down hopefully around 350whp @ 15-16lbs of boost....maybe more, i hope. the spool is my main problem tho, thats whats holding back all the power b/c you can see on the dyno graph (ill try to post it later, im at the shop right now) that once it does spool up the power just keeps on climing hard as ****, but i run out of rpms. a lot of people keep saying it seems to be a problem with something else.... what else could it be??

boosted92

Please, being stock bore and 9:1 compression has little to do with the fact that you're spooling that turbo 1000 RPM's later than people on stock B16's are. You have an exhaust leak or a boost leak, an SC61 doesn't spool that slow just because you're on lower compression. And I bet the humidity/temp had nothing to do with the numbers either, since they were probably SAE corrected.

DRIVENRacing

sorry but sc61 is a kick *** turbo nd makes amazing power on low and high boost...

M.A.R.C.

ill tell you what your problem is right now.... i'm running the same setup. i had a 2.5" dp and 2.5" exhaust (Well... 2.4" to be exact). the car was dead slow. like horrible. went 13.7 @ 107 on 17's. i was pissed and frustrated... swapped to a 2.5-3" downpipe and 3" exhaust. WOW... what a difference. powerband is A LOT better, the response is way better, and the car FEELS faster. those upgrades will make the car happy... trust me

mrbsponge

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted92 &raquo;</TD></TR><TR><TD CLASS="quote">Please, being stock bore and 9:1 compression has little to do with the fact that you're spooling that turbo 1000 RPM's later than people on stock B16's are. You have an exhaust leak or a boost leak, an SC61 doesn't spool that slow just because you're on lower compression. And I bet the humidity/temp had nothing to do with the numbers either, since they were probably SAE corrected.</TD></TR></TABLE>


BINGO!

I think yo may have an exhaust leak as well, or something may be wrong with the turbo, was it new? and as far as an equal length manifold goes, that has shown to actually give more power on the top end and less on the low end. my turbo spooled later with an EL manifold.

the inline pro should spool it faster than that, but have seen plenty of frind experience full boost or spool in the 5000 range, so to me this is no big surprise, i think the sc61 is probably overkill, the 44 or 50 would be great, what is the AR on both of the exhaust sides of each turbo, were they both 63s or was the sc50 a .48 AR and the sc61 a .63?

s2kdre

si's have a short stroke too, and with 9:1 compression its even worse. I'm runnin 9:8 on my ls and i spool that sc61 like it aint ****.

DIRep972

iTrader: (1)

Im voting for exhaust leak. That is very uncharacteristic of both of those turbo's.

B00STED Si

ive had an exhaust leak, ive fixed it, yes, its a brand spanking new turbo. theres no boost or exhaust leaks, it has been like this since the day it was boosted. maybe im over estimating the spool levels, but it feels pretty laggy, but when it hits i feel like i got kicked in the *** by an 18 wheeler, lol.


btw if neones interested i think the car will be for sale soon.

*Boostwerks*

Maybe I shouldn't ask the dumb question...but how sure are you actually have an SC61?

It should say "61" engraved on the compressor outlet.

boosted92

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmhonda &raquo;</TD></TR><TR><TD CLASS="quote">si's have a short stroke too, and with 9:1 compression its even worse. I'm runnin 9:8 on my ls and i spool that sc61 like it aint ****.</TD></TR></TABLE>

http://www.evans-tuning.com/fo...=1612

Compression makes a big difference in how quick the turbo spools, too

JDogg

compression dosnt matter with spool... if you tune it right there is no difference... displacement spools turbos

the sc61 has a big outlet, almost 3inches, if you have anything less than a full 3 inch dp you are killing the flow coming out of the turbine... remember it has a t350 turbine wheel, not your standard t3

fast93accord

the compressor on the sc61 is only efficeient from 15-22psi. at 15psi it is just getting started. I hope you plan to run more then 15psi. Otherwise i'd buy a smaller turbo.
I'm running the same compressor wheel on my F22.
I get full boost at 5000rpm, and i redline at 7000.

JDogg

you guys have something wrong.. i have done a bunch of b16's with that turbo, 10-12psi comes in about 4800-4900... sc61 is perfectly happy running 8 or 30psi.

boosted92

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fast93accord &raquo;</TD></TR><TR><TD CLASS="quote">the compressor on the sc61 is only efficeient from 15-22psi. at 15psi it is just getting started. I hope you plan to run more then 15psi. Otherwise i'd buy a smaller turbo.
I'm running the same compressor wheel on my F22.
I get full boost at 5000rpm, and i redline at 7000.
</TD></TR></TABLE>

60-1 wheel isn't the same as an SC61 champ. And for that matter, the 56-trim wheel is in it's peak efficiency zone starting as low as ~7 psi.

TheShodan

iTrader: (14)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg &raquo;</TD></TR><TR><TD CLASS="quote">compression dosnt matter with spool... if you tune it right there is no difference... displacement spools turbos
</TD></TR></TABLE>

I'm sorry, but this is also incorrect. Compression really helps in turbo response on and off boost with the change in exhaust turbulence

boosted92

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TheShodan &raquo;</TD></TR><TR><TD CLASS="quote">

I'm sorry, but this is also incorrect. Compression really helps in turbo response on and off boost with the change in exhaust turbulence</TD></TR></TABLE>

http://www.evans-tuning.com/fo...=1612

That says it doesn't. I'll take Boosted Hybrid's actual test, and Jdogg's opinion as an experienced tuner over your thoughts, thank you kindly. Shockingly my 9:1 GSR spools up my turbo the exact same as it did at 10:1.

wantboost

iTrader: (2)

I bow to jdogg


Modified by wantboost at 4:01 AM 6/12/2005

95GSRTT

wow dont sound like you just got done slobbering on his nuts or anything.... Jeff is a great tuner and has done tests on trying to prove that compression doesnt really help all that much. But Im also sure there is someone out there that is as good who thinks otherwise. Doesnt necessarily make either of them right...

boosted92

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wantboost &raquo;</TD></TR><TR><TD CLASS="quote">^ do you even know who theshodan is and who he works for... i do and i think ill take his word over yours, jdogg's and jeff evans. prepare to be pwned if he decides to reply </TD></TR></TABLE>

He has opinion right now, Evans has a REAL test. If he can show something other than a "well I worked on this one car...." go right ahead. Evans tested the same car on the same dyno, and showed that with the right tune the spool up time is virtually the same, and if you think 2 WHP before boost hits makes your car a lot more responsive on the street then your butt dyno is a lot more sensitive than mine.