I have a ls/vtec setup... stock sleeves with blockguard and pistonsrods... i have reached to boost limit for efficiency on my 60-1... i am looking for a good breathing turbo up top with not too much lag... obviously the gt35r has a better spool time than the t3/t67 but is it that much better to offset the price difference??
this is a t3/t67 w .82ar exhaust housing vs gt3540r with .82 ar exhaust housing... info appreciated...

 

What are your power goals Danny? if you can afford it the GT35 is NIIIIICE and will make 620ish or alittle more whp the T3/T67 will lag a little more but will make more top end and have a little more potentioal. Can't go wrong with either. The GT35R is backordered for awhile though!

 

i think your think of someone else... im chris... all good though...

i made 475 on stock sleeves... power goal is around 550...
im having a problem with my setup... it could be a got an ls tranny or just fourth gear or clutch may be slipping... at the track diwn low the car puts out consistent good number but something is hindering the setup up top... im trapping 98.5mph in the eighth and 123 in the quarter... trapped should be somewhere in the 130's

anyway the car feels like it dropps boost goin into fourth and has too spool again to reach full hp...

 

Sorry I was thinking Danny with the ITR. DOH!

 

Slowboy racing can get em quick......eric(don't blink) runs a GT30R from them....they have a lot of turbos and also have a GT14(also known as a GT3040) they may even have em in stock..... they are local to me and pretty good guys(this is not a business plug but a place you can get em I would say decently fast)

T3/T67 is a ineffiecient dog. think about it. if this is a street car you are runnin a T3 exhaust wheel which is pretty small then a huge t67 compressor side. just think how fast the T3 wheel will be spinning as compared to the T67 making say 15-20psi. the centripital(sp) force on that wheel would be rediculous.....I have yet to see a compressor map or anyone run one over 10psi on a street car for any length of time, but who am I to say since I don't have enough posts to be trusted

 

i don't think its correct to say the 67 compressor is a dog. the 67 makes power under a broad boost range 9 psi to 30+ psi. whereas the GT35R has a sweet spot around 25+ psi.

 

I am not talking power potential I am talking over effiency....you will pull exhaust wheels apart kind of like jordo did at 8psi but 4 times worse at 30psi......GT35R is the way to go

 

gt35r is wat i am leaning towards. another option for me is the innovative gt61s

 

i agree with bostr41 gt35r is what ya need imo

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BoostR41 &raquo;</TD></TR><TR><TD CLASS="quote">I have yet to see a compressor map or anyone run one over 10psi on a street car for any length of time, but who am I to say since I don't have enough posts to be trusted </TD></TR></TABLE>

I am running a cheapturbo.com T3/T67, .63 A/R exhaust housing and a stage 3 wheel, 16 psi on pump gas and I have about 11 thousand miles on this setup. Impeller speed is impeller speed, no matter if you have an R-trim TO4 exhaust wheel or a stage 3 T3 wheel. I remedied the small exhaust wheel with a larger wastegate to bypass more exhaust from the housing. Works fine on my street car.

 

no impeller speed is not impeller speed....this is physics. look the outside diameter of the exhaust wheel is XX the outside diameter of the compressor wheel is XX now the outside of the compress wheel is spinning for example at 400,000rpm if the exhaust side that is connected by a shaft is spinning with the compressor wheel it's RPM will be much higher....that is why they don't recomend mismatched compressor and exhaust wheels. it really is simple physics but what do I know

 

If the compressor is spinning at 100,000 RPM's the turbine is spinning at 100,000 RPM's, what doesn't make sense about that? If a TO4E 57 trim wheel can spin to 100,000 RPM's to make, say, 30 pounds of boost, and a T67 wheel only needs to spin to say, 80,000 RPM's. What you're saying doesn't even make sense, the shaft speed for the turbo should/will be lower with a larger compressor wheel than a smaller one.

But hey, what do I know, I only run a T67 on my car. Real life experience be damned, lets do it by the books!

 

400k rpm is 400k rpm on both side. If you are judging speed by rpms then they are equal.

The speed of the blade tips WILL be different if the wheels are different size.

 

wrong....OD of the wheel dictates it's speed man....that little T3 wheel is spinning so fast with so much force it is rediculous.....talk to people who know physics...yes real world is where it is but that exhaust wheel will not take that forever....it is all about centripital force man. it is the same concept as 17" wheels compared to 13" wheels if you put one on one side of a car the other on the other the 13" will rotate more times in a mile than the 17 even though they are both moving the car and it is moving at a uniformed speed

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vteg &raquo;</TD></TR><TR><TD CLASS="quote">400k rpm is 400k rpm on both side. If you are judging speed by rpms then they are equal.

The speed of the blade tips WILL be different if the wheels are different size.</TD></TR></TABLE>

that is what I am talking about the wheels RPM not the turbo shaft RPM

 

I too have been running the t3/t67 stage 5 wheel turbo on my car at 24psi and race gas consistanty on the street for a while now without any problems, n if I remember right geoff said that someone on the east coast dynoed at 640whp on a gsr motor at over 30psi.

I'm using the .63 a/r housing on my car now but I used to have a 60-1 stage 3 wheel with a .82 a/r housing and they car spools up quicker and made more power at the same amount of boost on a more conservative tune.

For the price you can't really beat it, but I'll tell you this if you do decide to get this turbo get it with the stage 5 wheel and the .82 a/r housing because thats the only way it will work right for you and make the power you really desire.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BoostR41 &raquo;</TD></TR><TR><TD CLASS="quote">

that is what I am talking about the wheels RPM not the turbo shaft RPM</TD></TR></TABLE>

No no no, RPM is revolutions per minute and what is connected to the turboshaft (i.e compressor and turbine wheel ) will of course spin at the same RPM as the shaft

What you are thinking about is that the speed of the blade tips on the compressor wheel will be higher because of the larger diameter, and therefore the longer distance it will have to travel at the same rpm's.

 

I think you are both right, just looking at it from a different angle, at two different things..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BoostR41 &raquo;</TD></TR><TR><TD CLASS="quote">that is what I am talking about the wheels RPM not the turbo shaft RPM</TD></TR></TABLE>

i suggest you not talk about physics when you can't tell the difference between angular speed and tangential speed. angular speed is measured in rpm, tangential speed is feet/meters per sec.

the downside of going with a t3 turbine on a 67 compressor is the flow potential or in other words hp potential is lower than a t4 turbine paired with the 67 compressor. the T4 turbine may accelerate slower than the t3 turbine, but ultimately has higher angular speed and tangential speed.

from my personal experience the gt35 compressor doesn't make much power @ the mid to lower boost ranges appropriate for pump gas. i find that the 67 compressor is much more flexible and makes power over a wide range, as demonstrated by people on this board, and myself. my car made 427 whp on a 1.8 @ 1 bar.


Modified by SEFIxCivic at 3:01 PM 11/6/2004

 

newgsr had the information i was looking for... i have a 60-1 stage 3 wheel with a .82 ar exhaust housing... i would be looking to switch to a t3/t67 w/ a .82 ar and a different exhaust wheel... i just dont want to car to be much worse in lag than it is now... car kinda falls off some boost between shifts but i think thats an unrelated driveterrain problem... it saw jeff evans comparsion with the gt3701 vs. the gt28rs... i want some midrange with alot up top.. right now im leaning towards the t3/t67 for price reason but the gt35r is just a sick turbo...

 

i have had no problems with my 67 up to this point, and honestly i love how the power comes on all at once. I get 12 pounds around 5200.

 

hey chris --

one thing you might want to consider is that there are no gt35Rs available right now, and there may not be any for a long time. I was told 4-6 months. We can do a cool setup with a p trim turbine in an 82 a/r t3 housing coupled with a t67 compressor for crazy power

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Full-Race Geoff &raquo;</TD></TR><TR><TD CLASS="quote">hey chris --

one thing you might want to consider is that there are no gt35Rs available right now, and there may not be any for a long time. I was told 4-6 months. We can do a cool setup with a p trim turbine in an 82 a/r t3 housing coupled with a t67 compressor for crazy power</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Full-Race Geoff &raquo;</TD></TR><TR><TD CLASS="quote">hey chris --

one thing you might want to consider is that there are no gt35Rs available right now, and there may not be any for a long time. I was told 4-6 months. We can do a cool setup with a p trim turbine in an 82 a/r t3 housing coupled with a t67 compressor for crazy power</TD></TR></TABLE>Hey geoff, how much will this turbo would cost me? pm me please. thanks.

 

I saw somewhere on here that a GT35R made 667whp on someones car...