Tony the Tiger

I'd thought I like to let you guys see the difference between the two turbos side by side. The difference is quite drastic, and I think the GT2871R is a little to big to be a good match with the turbine though. Anyways, here's a pic of the two turbos:




Pics of the GT2871R:

alpha

I thought the compressor wheel was a little too large to be a good match with the turbine wheel as well. That was until I saw the results Jeff Evans was getting with it and before I got a chance to get my hands on one. Spools quick and makes good power I will update when we replace the wastegate.

stick

Tony the Tiger,
did u ever get ur GSR dynod?

Tony the Tiger

No new dyno except for the old 286WHP @ 8 psi

The GT28RS turbo died before I got a chance to dyno the car at 12 psi... Ever since, I switched to the GT2871R. I will be dynoing that shortly though I am waiting on my electronic boost controller so that I can dyno my car at several boost settings.

Makdaddynuge

still gonna be using the sleeper setup with the exhaust heat shield and all?

Tinker219

I agree, GT28/71R is uber sweet. "Atheist" thought it would be too big for his b16a, but he gets full boost by 3500rpm and rips all the way to the rev limiter(gets there quick too!).
Im using the 30/71R in my S2k, same story, 3500-redline with the flattest torque curve Ive EVER seen...

wantboost

iTrader: (2)

cody, you dont have a torque curve.... you have a torque line

Tinker219

ok, youre right
We will be touching up the basemap this week, turning up the boost so hopefully we can see 350whp on pump gas, 10psi or so

blundar

Tonythetiger, try to find some pictures of the turbos used on the old-school F1 honda/mclaren turbo motors. You'll find compressors that dwarf their turbines to an even more drastic degree than the GT2871.

When you have a turbo with such a "mismatched" hotside/coldside, the key to keeping the system working well is wastegate placement and size... You essentially need to optimize your system for the steady-state where your wastegate is holding boost in an equilibirum state NOT try to minimize losses while spooling the turbo by choosing a larger A/R. Throw efficiency pre-spool out the window and reap the benefits after the wastegate opens...

I'm excited to see how this fares with your motor. Your last setup was very impressive.

Edit: my bad on the Tonys - apology.


Modified by blundar at 4:05 PM 6/17/2005

.dave

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blundar &raquo;</TD></TR><TR><TD CLASS="quote">Tony1, try to find some pictures of the turbos used on the old-school F1 honda/mclaren turbo motors. You'll find compressors that dwarf their turbines to an even more drastic degree than the GT2871.

When you have a turbo with such a "mismatched" hotside/coldside, the key to keeping the system working well is wastegate placement and size... You essentially need to optimize your system for the steady-state where your wastegate is holding boost in an equilibirum state NOT try to minimize losses while spooling the turbo by choosing a larger A/R. Throw efficiency pre-spool out the window and reap the benefits after the wastegate opens...

I'm excited to see how this fares with your motor. Your last setup was very impressive.</TD></TR></TABLE>

Its TonytheTiger, not Tony1 .

I think I'm going to pick up one of these from Full-Race to throw on my D16. They offer one with a T3 exhaust housing, which is what my manifold is flanged for. Any thoughts on this?

EDIT: Never mind, they only offer it with the 5 bolt flange and I'm sick of ******* around with my setup. Anybody know the closest or smaller sized SC-series turbocharger to this one?

BlackT5

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tony the Tiger &raquo;</TD></TR><TR><TD CLASS="quote">
The GT28RS turbo died before I got a chance to dyno the car at 12 psi....</TD></TR></TABLE>

What caused the turbo to take a crap?

roydogg

will this turbo bolt up to a 18g Greddy manifold?

ITSME4G63

the one on the right!!!111

accord387

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlackT5 &raquo;</TD></TR><TR><TD CLASS="quote">

What caused the turbo to take a crap?</TD></TR></TABLE>

non-VTEC

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlackT5 &raquo;</TD></TR><TR><TD CLASS="quote">

What caused the turbo to take a crap?</TD></TR></TABLE>

his right foot

O3DigitalBath

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlackT5 &raquo;</TD></TR><TR><TD CLASS="quote">

What caused the turbo to take a crap?</TD></TR></TABLE>

wantboost

iTrader: (2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ITSME4G63 &raquo;</TD></TR><TR><TD CLASS="quote">the one on the right!!!111</TD></TR></TABLE> ?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlackT5 &raquo;</TD></TR><TR><TD CLASS="quote">

What caused the turbo to take a crap?</TD></TR></TABLE>

Ace.

Even those in the Nissan world at first shunned the 2871 as being an improper mismatched turbocharger...that was until the first dynos came out...

While not as quick as the Disco Potato (only a few 100 rpm), the 2871 more than makes up for it by not 'dieing' off from 5500 to redline...infact it keeps gaining power...

As with Nissans and as even seen in the dyno above, the 2871 is known to create 'torque lines' insteadof curves...not a bad thing IMO :]

May I ask what size you are running?? the .64 or the .86???? I'm still undecided with my 240 build...I want quick spool bad, but I believe extrude honing the manifold as well as turbine may help the larger .86 housing spool equal the .64..

Good choice of turbocharger :]

Tony the Tiger

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlackT5 &raquo;</TD></TR><TR><TD CLASS="quote">

What caused the turbo to take a crap?</TD></TR></TABLE>

It was mainly caused by the way I had my rev limiter set up... Everytime I hit the ignition cut, it would create pretty nasty backfires because I dial back the timing and add a bit more fuel at redline (to promote better boost response). I never cared much about it though until one particular night, the ignition rev cut created this awfully loud abnormal backfire, probably 10x louder than a regular backfire. Got back home and the turbo was trashed... just like that.

The GT2871R is indeed a good turbo... Just by looking at the dyno graphs tells the story. However, it did lose that "boost on tap" that I used to get with the GT28RS. I do miss it because with the ITB's and my engine combo, the car actually felt close to NA with the GT28RS. I was able to modulate my throttle to control wheelspin just like an NA car and it was a blast to drive. Now with the GT2871R, I am much more dependant on gear-based boost control and it's hard to catch up during an "unexpected" run (where as the other car has a slight headstart). Power is great, but I am all about useable power. Anything above 350WHP for a street driven FWD Honda is trouble, and the GT2871R is more than I ever need for a street setup. The GT28RS was indeed the perfect turbo for my power bracket though, so I might switch back one day.

Ace.

What size though .64 or .86???

From what I've seen/read in the Nissan world, the .64 is damn near equal to the disco potato when it comes to spool whereas the .86 has a bit of boost onset waiting...?

Tony the Tiger

Still running the same .86 I had when it came with the GT28RS

For high revving hondas, if I go with the 0.64, it's going to choke pretty badly especially when seeing 9200RPM's The power curve would change because although the compressor is larger, the smaller turbine housing would shift the powerband earlier. I liked the GT28RS because boost came immediately with the smaller compressor, but the larger 0.86 turbine housing was able to hold power all the way to 9200RPM.

Makdaddynuge

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Makdaddynuge &raquo;</TD></TR><TR><TD CLASS="quote">still gonna be using the sleeper setup with the exhaust heat shield and fake intake?</TD></TR></TABLE>

Tony the Tiger

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Makdaddynuge &raquo;</TD></TR><TR><TD CLASS="quote">still gonna be using the sleeper setup with the exhaust heat shield and all?</TD></TR></TABLE>

Yup, same manifold and everything. The GT2871R was a direct swap

HiProfile

And here I thought the gt28rs was considered on the big side for the LS I was dreaming of putting it on.

Speaking of which, that same turbo will fit on the manifold I'm selling. Not to steal the thread with the new, still in kanji-makred baggie, rust-free unused part, but...it is a nice manifold design. Perfect for the T25 exhaust flange those turbos run.

Tony the Tiger

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">And here I thought the gt28rs was considered on the big side for the LS I was dreaming of putting it on.

Speaking of which, that same turbo will fit on the manifold I'm selling. Not to steal the thread with the new, still in kanji-makred baggie, rust-free unused part, but...it is a nice manifold design. Perfect for the T25 exhaust flange those turbos run.</TD></TR></TABLE>

Not to pick on your words, but it is pretty damn obvious that you are trying to hijack this thread. I am running the HKS manifold which is the same one you are selling...duh LOL Get you own thread at the classifieds