there are other ways to make it work.(COMBO is the key) for example .96? comp trim ext trim etc.........

 

 

no. a gt 4082 will not flow enough air. there are no ways to make it work other than going to a 4088 which is a different compressor.

 

this is why I perfer the GTS series........

 

... gts series?

 

Are you refering to the ITS GT and GTS series or the Garrett GT series? They're totally different turbos.

 

the "new" garret lineup,gt technology with a twist . they come in 74/76/78/etc.....
it's a PRECISION turbo.i'm curently using the 74mm.

 

I knew pluto would know "ITS GT/ GTS" yes they are totally different.

 

the 87-88 ports will flow enough, but you have to worry bout the oil filter platform area cracking.

i just ordered a pt61 with .96 hotside. this should outflow my gt-40 and spool better =]

 

thats right,stock s/5 ports @ that!!!! w/ extra dowels (4)

 

engines dowl'd and the
oil is by-passed

I can crack loose the rear dowl and it won't leak a drop

 

if your ports are stock you should see > 500rwhp at around 25psi

 

11.72@118 you think its stock?

 

.... thats not hard to do on stock ports, infact the mph is low. but you said a few posts earlier > 500rwhp on 87-88 ports.. if you ported it, then what are you trying to prove?

 

My friends shop has 20B's Cosmos GTR 13BT and GTX 13BT's housings laying around

I know for a fact 89's have larger ports to port

93-95 have way bigger ports then the 13BT's
and the Cosmo's are EVEN bigger

you would have to read the 2nd gen section to see the people saying S4's engines are no good for 500 to understand.............


My top MPH has been 120
at 14PSI

GT40's cant make the power I made at 14PSI
comparing all the Dyno's so far
with my T66 and now I'll try to do more with the new PT-67

My point being the S6's (FD's) should make MORE power at my PSI
cause they have larger ports......ported or not

 

Well this is all very interesting. I too, run the 4082. Steve, is the 4082 you tuned the same as mine? Has the V-band compressor discharge? I have a "marine" version apparently, but the turbo's composition appears to be the same for the automotive app.

I'll really really have to watch my boost more closely to see if it falls off. I seem to recall the boost really comes on hard at 4K rpm holds fine and then seems to drop off a bit by redline. I thought it was just the duty cycles on my AVC-R. For those that don't know, Steve tuned my car to the tune of 390hp or so. I have what I would consider very large ports (ported Cosmo 13BRE) but I'm sure they're not as efficient at producing hp as ports done by a pro. With more agressive timing/fuel on a different dyno, I made 406rwhp with this turbo. I also have what I consider to be just an "ok" manifold, GReddy JDM model with runners that are very large and not fully divided. My 4082 has a .96 hot side. My old turbo, a modified GReddy T78 with a GT series compresor wheel made much more hp up top (i'm estimating 50hp more) but didn't spool all that well with the setup I had.

I considered Precision Turbo except no one there seemed to know anything about rotaries. They kept on trying to push an SC63 or something, which had a T3 flange. Every person I talked to there gave me a different answer. So I went with the 4082 which, at $700, seemed like a good deal. It does spool quickly and has a nice strong top end. Enough so that my clutch is now gone and I suspect, caused my dyno numbers to be a bit low. An RPS Max series is on the way with a six puck. I may dyno again and see what's what.

If it isn't up to snuff, I guess that gives me an excuse to experiment a bit more, no? I "hear" they make a plain bearing 4088 but I have yet to see or be able to get my hands on one.

It's strange, but when I was debating this turbo some time back, everyone said go with the 4082 and not the 4088 (except for a select few). I won't mention any names! Still, 390hp is nothing to sneeze at, especially for a turbo that costs comparatively little to big name offerings.

 

hell no 390 is sweet on the street
theres no shame there

plus for the price

Its not like you spent a fortune and would be at a major loss to sell it
and get a diffrent turbo..later on........if you so desired

for daily drving I would be happy with 300HP on low boost (pump gas)
at the track..High boost of course

I.E duel stage boost controller comes in handy

 

see michel i knew you wanted a 6 puck so you could be like me!

 

Hey Michel,
Do you have a copy of the dyno chart (scanned) so that I can look at the difference? On the car that I tuned yesterday, I couldn't get it over 17psi of boost no matter what I do so it leads me to believe that the turbo is definately too small for rotary application. Now that I wanted to compare the spool up time with different manifold just to see how that compares.

 

Yes I have it scanned...I'll have to search through my 10,000 images on my archive here (it's more like 100,000!). Give me a few...but I just got to thinking that you weren't able to hold it past 17psi and I remember seeing that my drops down a bit at high rpm...I just always thought it was the boost controller.

John, mine will be a sprung hub :-) Nick talked me out of the Exedy and into the RPS.

Lemme go find that dyno graph.
Michel

 

Ok, here we go...Steve, I remember you saying that you were surprised at it's spool time. If you remember Russ' car actually started to spool sooner with the GT40R and his bad motor! I may have that graph someplace too. Going to go look again.

 

Ok here's a GT40R on a low compression motor vs. me, same day, same dyno, with what I believe is a motor in ok condition (wasn't my strongest run that day, 2nd best I believe as Steve was still working on her). Notice that Russ with his GT40R and bad motor makes more power down low. Could be a combination of my large ports and less-than-optimal manifold however. You know Steve, if you want to, you could send me one of your manifolds and a downpipe and I would be more than happy to test it out for you on my motor.

And just for kicks, here's all the single turbo cars that were tuned that day. There's an RX6 and a T04S as well.

 

thats scary i've had mine for 5 yrs now,time for a new name?

 

GTS turbo? never heard of it.. any Sites or info on it.. is it a sieries or just a Turbo?

Frank

Damn this thread moved fast