boport

Hello,

I am new here and am impressed with the amount of turbo tech that goes on here.

I have a 2.3L SOHC engine (non-honda) and currently am using the GT40/94R turbo from Garrett. Based on power output and responsiveness of my current turbo I am led to believe that I am leaving power on the table with a restrictive turbine section. I am after maximum power output and am not concerned with spool time (to an extent). I would be happy to make 30# by 6000 rpm and am open to the use of nitrous for spooling.

My problem with the Garret GT40R series of turbos is the limited turbine housing options. I have a fairly well designed header that was intended to utilize an open or undivided turbine housing. This led me to the precision line of housings available for that turbo. I am at the maximum A/R housing they offer right now and would like more turbine flow.

The 42R is only available with a split scroll housing....and I cant see putting my efficient header design to waste by transfering my open exhaust outlet from the header into a "wall" basically of the split scroll housing. A heavy wall at that.

The Precision line up of traditional T4 open housings seems like the better ticket. I am thinking the efficient header could utilize a larger T4 style turbine wheel and housing, despite the precision turbos of this inducer wheel diameter I target are only available with a journal bearing section.

My main question is for those that have found a T series turbo (precision, turbonetics, etc) that is comparable to the 42R and what the major differences in power and spool time were. Or am I over thinking the split scroll flow losses and I would be best of with a 42R...?

Here is a picture of my 321 header I built and why I want to keep an undivided housing layout.

ek9t72

I had the same problem I just going with a turbonetic t76 Q-trim .68a/r bb

OBRJosh

what size .Ar turbine housing are you running on the 4094 now? 1.06 or the 1.19

pheurton-skeurto

its gonna be asked eventually, so i'll be the first...

what engine is this going on?

boport

Well that's good news, at least now I dont feel like I am a COMPLETE nut. What turbo were you using beforehand?

boport

I was using the .95 Precision housing (undivided).

boport

2.3l Ford SOHC 8valve...a pinto engine for those of you who aren't familier with the engine.

boport

no other opinions? Thanks

Justin Olson

Wait a little while for the Tial Turbine housings to come out. They have a round undivided turbine housing for the GT42R. That would be the best bet in my opinion.



If you dont want to wait, get a t51r turbine housing for a gt42r
http://cgi.ebay.com/ebaymotors...wItem

Justin

ludicrous

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


The 42R is only available with a split scroll housing....and I cant see putting my efficient header design to waste by transfering my open exhaust outlet from the header into a "wall" basically of the split scroll housing. A heavy wall at that.

</TD></TR></TABLE>

Hi and welcome...

I ran into the same problem when I had my manifold built and was not aware that the turbo I was getting HAS a divided housing...didn't want to sell the maifold and buy another one, also I didn't want to go out and buy another turbine housing either...what I did was knife edged the housing I had, knowing that the spilt hosuing may cause a bit of problem, i went ahead and knife edged it. It seemd to work fine...made some decient power. (ran the whole year like this)

We also just did some testing on some turbo's and using the same manifold we forgot that my housing was knife edged and it seemed like the little grinding wirked fine...sooo, just get a GT42r and just grind the "wall" to a knife...

thats my experience and my 2 cent...

b18sihatch

for the tial housing

SPOOLINmatt

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b18sihatch &raquo;</TD></TR><TR><TD CLASS="quote"> for the tial housing</TD></TR></TABLE>

am i not the only one scared of the thought of the turbo hanging on by a v band clamp, none the less though, its bad ***. I do it.

k24em2

Formula One has been using vband turbine inlets for years.

Cyber ITR

what about HKS T51R ???
full v-band turbine housing too

SPOOLINmatt

kool.

why are we comparing a 70mm turbo to a 76mm turbo in the topic title. thats like squash and grapes comparison

Boostfed

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

why are we comparing a 70mm turbo to a 76mm turbo in the topic title. thats like squash and grapes comparison</TD></TR></TABLE>


Actually a GT42R comes in three configurations
GT4294R , Inducer 70.3mm Exducer 94mm
GT4202R , Inducer 74.3mm Exducer 102mm
GT4276R, Inducer 76mm Exducer 102mm


Edit:But if you wanted to get technical a GT42R is the GT4294R but the GT4202R is actually called the GT42RS soooooooooooooo it would make sense by the thread title if you meant it that way

accordking

sorry to thread jack, but it's about time someone came out with this. <TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Justin Olson &raquo;</TD></TR><TR><TD CLASS="quote">Wait a little while for the Tial Turbine housings to come out. They have a round undivided turbine housing for the GT42R. That would be the best bet in my opinion.

</TD></TR></TABLE>

SPOOLINmatt

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


Actually a GT42R comes in three configurations
GT4294R , Inducer 70.3mm Exducer 94mm
GT4202R , Inducer 74.3mm Exducer 102mm
GT4276R, Inducer 76mm Exducer 102mm


Edit:But if you wanted to get technical a GT42R is the GT4294R but the GT4202R is actually called the GT42RS soooooooooooooo it would make sense by the thread title if you meant it that way </TD></TR></TABLE>

i as just going by the website listings for sizes, didnt even see the gt4276r on there.

i was gonna say RS but i just kept it simple for those 2 sizes.

SPOOLINmatt

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by accordking &raquo;</TD></TR><TR><TD CLASS="quote">sorry to thread jack, but it's about time someone came out with this. </TD></TR></TABLE>

so is tial making housings that can swap out on teh gt42? are they going to make any with a smaller AR ratio than 1.01, they dont have much info on them right now from what it looks like.

boport

Thanks for the replies.

Yes, I should have clarified more in the post title. I am rfering to the GT42rs (76mm inducer) to the precision 76mm.

I am awaiting the release of the tial housings. This opens up the door for even more posibilities. I would need to re-engineer my current turbo bracing however, which used the T4 header flange as a main mounting point to the engine and chassis. I think it would be worth it though.

I wasn't aware of the HKS unit, thanks for the information. I think though If I am going to change the header and bracing for a V band inlet I would hold out for the Tail housing and stay with a 42rs.

On a side note, if anyone has a 42rs now or precision PT76 GTS that would be interested in trading for a GT4094 with a custom bell inlet please let me know. Its probably unlikely someone would want to downgrade in size, but what the hell. PM me if you know of anyone interested.

Thanks again for the responses.

Bo