thinking about using this with a fully built ls vtec at 15psi? thoughts? id be willing to sacrifice top end for some down low power. i plan to take my motor up to 8000rpm.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by the.hamburglar &raquo;</TD></TR><TR><TD CLASS="quote">thinking about using this with a fully built ls vtec at 15psi? thoughts? id be willing to sacrifice top end for some down low power. i plan to take my motor up to 8000rpm. </TD></TR></TABLE>

Rpms are irrelevant. What hp goals are you trying to accomplish? What are your needs? You've been here long enough to know you must be more specific than this question..

 

b16 at 15 psi maybe.

how about a 30r on the ls?
am i wrong?

 

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

Rpms are irrelevant. What hp goals are you trying to accomplish? What are your needs? You've been here long enough to know you must be more specific than this question..</TD></TR></TABLE>

Jesus christ.

RPM and HP couldn't be closer tied together. If you replace the "word" hp with torque, then maybe your statement has some validity, but even then it's very little.

 

lol

 

here's my gt2871r.

https://honda-tech.com/zerothread?id=2035882

 

IMHO the disco potato, is the BEST street turbo

they are very popular with VW,
I heard it's most officiant @ 17psi


I jsut have the GT2860R @ 10 and I'm faster then my friend with the SAME ENGINE, SAME TUNER, they actually make about 40 MORE HP then I,and have bigger turbos
but I'm still faster.

I wish I had purchase the GT2871RS, best for street!

 

The "Disco Potato" is the GT2860RS.

As far as GT2871, the GT3071 with a smaller turbine housing might be a better match for street. It would combat the fast torque peaking that causes wheel spin. But I digress...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by brute &raquo;</TD></TR><TR><TD CLASS="quote">The "Disco Potato" is the GT2860RS.

As far as GT2871, the GT3071 with a smaller turbine housing might be a better match for street. It would combat the fast torque peaking that causes wheel spin. But I digress...</TD></TR></TABLE>

Word. The only thing is with a smaller turbo you can throttle in and out to control wheel spin and not have to worry about lag. Bigger turbos are kind of like light switches, either on or off. With a smaller turbo, its like a dimmer switch. It's nice to be at 65-70% throttle and still make positive pressure.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Daniel-sanB1 &raquo;</TD></TR><TR><TD CLASS="quote">IMHO the disco potato, is the BEST street turbo

they are very popular with VW,
I heard it's most officiant @ 17psi
!</TD></TR></TABLE>

its a mix of pressure ratio (psi) and flow, and even at that sometimes the compressor maps can be a little off of how a turbo and setup can perform


imo 3071 or 3076 if you are looking into gt series. with the ball bearing id expect to see all the boost by 4500 on an lsvtec, but it dont matter much the motor wont be making peak power till 7000+ anyway, and your transmission will never have you in low rpms while hammering it anyway

 

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

Rpms are irrelevant. What hp goals are you trying to accomplish? What are your needs? You've been here long enough to know you must be more specific than this question..</TD></TR></TABLE>

huh, what are you talking about? air flow is a function of rpm. at 8000rpm a motor will flow twice as much as at 4000rpm.

and my question was "does anyone have experience with the disco potato?" i just want to hear what some people think about them.

 

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

its a mix of pressure ratio (psi) and flow, and even at that sometimes the compressor maps can be a little off of how a turbo and setup can perform


imo 3071 or 3076 if you are looking into gt series. with the ball bearing id expect to see all the boost by 4500 on an lsvtec, but it dont matter much the motor wont be making peak power till 7000+ anyway, and your transmission will never have you in low rpms while hammering it anyway</TD></TR></TABLE>


here are the two compressor maps.





looks as though the gt30 is most efficient at 32lb/min (or 6700 RPM) at a pressure ratio of 2.0 (15psi), and the gt28rs is most efficient at about 27lb/min (or 5600 RPM) at the same pressure ratio. im just worried that the gt28rs will not hold until 8000rpm with a 1.86L (117cid).

i am just having a hard time justifiying spending twice as much money on a ball bearing when i have never tried one out or have any friends with them. are they that much better?

 

here is another map for the t04e compressor:



looks like it will be most efficient at about 28lb/min at about 15psi (2.0 pressure ratio). almost the same as the gt28rs, hoever it might not spool as fast becuse its a thrust bearing but it might hold to 8500?

here is a current vid of my car with a t3/to4e 60 trim. way to laggy for me. it made 322whp at 10psi last week. when the turbo kicks in it kicks in hard as you can see:




Modified by the.hamburglar at 1:27 AM 8/29/2007

 

50 trim will fall a tiny bit around 8000 i think, but you might not notice it much.

a 57 trim should hold out.

i run the 60-1 which is very very similar to a 3076 just not ball bearing. i hit 17 psi at between 4900-5100 and it pulls very hard to 8700.


if you really want that fast of spool, then i think you will be sacrificing some up top, especially if you dont go ball bearing center section

 

the 28rs will work.. use the t3/82ar turbine that atp offers.

i have made ~380hp with 18-19lbs of boost with that turbo. the turbine is small so it dosnt carry the power out very far. 7500-8000 is about it.

 

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

Word. The only thing is with a smaller turbo you can throttle in and out to control wheel spin and not have to worry about lag. Bigger turbos are kind of like light switches, either on or off. With a smaller turbo, its like a dimmer switch. It's nice to be at 65-70% throttle and still make positive pressure.</TD></TR></TABLE>

a gt28rs is like a light switch with no off button lol.

hamburgler ive spoken with you in pm's i think everyone here wants a little more information about your build, and your goals. you told me you wanted 350whp. what kind of engine components will you be using?

if i had a fully built ls/vtec i would be running a gt3076 and shoot for more power. thats me though.

 

just get a t3/t4 57 trim .60/.63 AR and call it a day. This will hold till redline (8700 rpms on my 2.0 LS/VTEC) and spools up around 3250-3500 rpms.

I did a 12.2 my first time with it at the track with only around 15 psi.

I had just a hair over 400whp@ 20psi

I loved how it had such low-midrage power. I had 150ft lbs of torque before 3000 rpms!!!

 

it's not about HOW MUCH HP you have. it's "When you have it"

and with you the disco potato, you'll have it sooner then your friends with smaller or bigger t3/t4

you'll be ahead of them... and even if they have that extra 50-80 HP top end.. they'll never catch up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Daniel-sanB1 &raquo;</TD></TR><TR><TD CLASS="quote">it's not about HOW MUCH HP you have. it's "When you have it"

and with you the disco potato, you'll have it sooner then your friends with smaller or bigger t3/t4

you'll be ahead of them... and even if they have that extra 50-80 HP top end.. they'll never catch up.</TD></TR></TABLE>

Do you guys race from a 5th gear punch at 40mph or something?

If you know how to drive, you can make a turbo MUCH bigger than a GT28 stay in boost when you're racing....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike1114 &raquo;</TD></TR><TR><TD CLASS="quote">just get a t3/t4 57 trim .60/.63 AR and call it a day. This will hold till redline (8700 rpms on my 2.0 LS/VTEC) and spools up around 3250-3500 rpms.

I did a 12.2 my first time with it at the track with only around 15 psi.

I had just a hair over 400whp@ 20psi

I loved how it had such low-midrage power. I had 150ft lbs of torque before 3000 rpms!!!</TD></TR></TABLE>

well.. one of my customers made ~380hp at 18lbs with a gt28rs on a built b16, went 12.0 at 120mph on street tires... a fat guy in a full weight 00 civic si. he shifted at 8500 or so

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg &raquo;</TD></TR><TR><TD CLASS="quote">well.. one of my customers made ~380hp at 18lbs with a gt28rs on a built b16, went 12.0 at 120mph on street tires... a fat guy in a full weight 00 civic si. he shifted at 8500 or so</TD></TR></TABLE>

And I shifted like an old lady too, still on the OEM tranny and axles after hundreds of launches (although I did knock all the teeth off of my ring gear one day at Rockingham, but that was from wheel hop on launch from that sticky crap the pro cars were slinging all over the track) and over 100K miles.

That was at around 22 PSI, on stock B16 cams. We ran the thing way out past it's efficiency range and it still kept making power, and it did it for a long time, was in perfect shape when I sold it.

Here's a partial dyno, the clutch was slipping up top on this one. Later we made 380 with a new clutch, but I never got a scan of that one:



Here's a dyno of the same motor running the same PSI on a GT3071R. This setup had more HP and torque, trapped 5 MPH faster (125), but had slower ET's and was way less fun:



Disco Potato FTW!

 

I have the GT2860RS with the .82 housing from ATP on a stock bottom end, built top end, LS/Vtec. This setup is paired with a GSR trans with a type R LSD. I am still useing a DRAG manifold and 2.5" downpipe and exhaust. This turbo rocks. I haven't found a situation yet where it wasn't 100% satisfactory. I am running this turbo @ 15 psi. Oh and for all the haters thinking, "that manifold sucks" and "why not a 3inch". I used it because it was what I had and I still have power steering and use my A/C everyday. This is all bundled up in a 92 SI.

Long story short Disco get "s up form me.

 

Downshifting is your friend. I've never had a small turbo so I ask this question- The turbo's that you guys are hitting full boost at &lt;3k rpm are they even holding boost/making power to redline?

 

disco is NOT for drag, it's for RR

a disco @18psi is totally stupid, your way the F off the compressor map....

Only clowns quote HP numbers on the net, every dyno is different

 

18 PSI (2.22PR for the mathematically challenged) goes right across the highest efficiency portion of the disco potato compressor map and goes within 1-2 lb/min of the PR (2.1) that goes the farthest to the right side of the map (i.e. - moving the most lb/min of air efficiently)! Have you ever seen a compressor map for a disco potato?

Disco potato's suck for RR in a Honda, I've RR'd one on multiple tracks. The torque ramp is way too steep to control when it hits (look at that vertical torque cliff on the dyno chart). You either have to keep the boost really low or stay out of the throttle until after you track out, trying to make up time in the straight. You could set up some kind of boost/traction control, but I got much better results from swapping my disco potato out for a GT3071R. I guess you could run a DP at 7 PSI, but you'd really have to be stupid to spend that much $ to run it in such a shitty portion of its map.

Edit - And my ET's got worse with the GT3071R, although my trap speed went up, fat lot of good that did me.