T34, where to get one?
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Joat_s2 (12-02-2015)
06-02-2015, 03:32 PM
#6
I haven't tried anything yet. I wanted to know with which suppliers people have good experience. BTW, I will probably keep the .48 exhaust housing, so I can simply use my current housing if I'm correct. But If I can get one with a .63 or a .55 I will put that on the shelf as future upgrade option. 
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06-02-2015, 04:12 PM
#8
I only see a second hand T34 on eBay and a new one for an escort RS turbo. Is the rs turbo one the same as a Cosworth one, except for the exhaust housing? A few days ago there was a T34.48 for a cossie on eBay from the same supplier, but it was a lot more expensive than the RS turbo one.
06-02-2015, 04:19 PM
#9
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if it was me id be wanting a modern roller bearing billet turbo there will be a considerable increase in boost threshold, maybe a gtx3071 im sure there available on a cossie rear aswell, I got 2 gtx3071s on my car there great turbos will run 480 hp each and there restricted in mine aswell.
I found the rear housing for the gt30r and gt35r
http://www.atpturbo.com/mm5/merchant...&Category_Code=
that will bolt directly to your stock yb exhaust manifold so you can fit a modern turbo
I found the rear housing for the gt30r and gt35r
http://www.atpturbo.com/mm5/merchant...&Category_Code=
that will bolt directly to your stock yb exhaust manifold so you can fit a modern turbo
Last edited by scoooby slayer; 06-02-2015 at 04:30 PM.
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Paul_RS (09-02-2015)
06-02-2015, 06:14 PM
#13
I already asked both MSD and Gerry Knubben. They both say the GT3071 will surge on a standard engine, that's why it would need a proper setup. Besides that James from MSD said the GT3071 would spool about the same as a T34.63. So it's a lot of trouble to go GT3071 and because of my standard gearbox I can't really benefit from the higher power either. That's why I'm back at a T34. But Gerry can't supply a T34 either.
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costina (06-02-2015)
07-02-2015, 01:03 AM
#22
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I already asked both MSD and Gerry Knubben. They both say the GT3071 will surge on a standard engine, that's why it would need a proper setup. Besides that James from MSD said the GT3071 would spool about the same as a T34.63. So it's a lot of trouble to go GT3071 and because of my standard gearbox I can't really benefit from the higher power either. That's why I'm back at a T34. But Gerry can't supply a T34 either.
If thats the case then a gtx28 on a T3 housing would be ideal, 400 hp and should easily outspool a T34, bb turbos are so much better it's night and day ime
07-02-2015, 07:39 AM
#24
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there are a few options, I have used one of these on a cosworth as all it needs is an rs500 rear 5 bolt flange wastegate housing and its then a direct fit
http://www.atpturbo.com/mm5/merchant...&Category_Code=
or this flange can be used on the above housing and your downpipe will just need a v band flange welding on
http://www.atpturbo.com/mm5/merchant...&Category_Code=
then there is this complete wastegate assembly, but it needs a iirc delta flange adaptor to bolt on which will then make it direct fit for your downpipe
http://www.atpturbo.com/mm5/merchant...&Category_Code=
I still don't see why you cant run a gt3071 though, it just needs running at lower boost so it doesn't surge.
I will try and find a link to the 5 bolt wastegate housing I used, as I had one on my saph and it looked like an rs500 rear housing.
Last edited by scoooby slayer; 07-02-2015 at 07:54 AM.
07-02-2015, 09:54 AM
#29
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cossierich ran one at 453 hp on a stock port head with just a bd14 inlet cam at iirc 30 psi.
I would think you should be ok at 20 psi, I ran a t4 on a stock port head with bd14 inlet and could run 22 psi before surge was an issue.
ask stu or tony if he could write a chip for just 20 psi across the board, that's what I would do they are so much more responsive roller bearing turbos and a gt30 with the adaptor rear housing will be a simple bolt on affair
tbh if I was you id want it live mapped anyway to get the best out of it, any off the shelf will be a compromise it has to be on the safe side imo.
07-02-2015, 01:04 PM
#30
But if the GT3071 is less responsive than a T34.63 and I would limit the boost, what's the point of having the GT3071? I'm Stu would be able to do a safe chip, but it's probably less optimal than the T34.48 chip, as that has been done many many times.
I know a live map would be best, but I'm from Holland so that isn't easy. There are a few people here who can map the Weber management, but none of them do the closed loop fuel control that I really want to have.
So I still believe a closed loop, off the shelf chip for a T34 is my best and easiest option. It's a bit of a shame, because I know the GT3071 live mapped and running full boost would be much nicer. But I'm coming from the standard T3, which is only running about 1.2 bar since it doesn't have a 360 degree bearing, so going to a T34 that is able to run full boost should be quite an improvement already.
I know a live map would be best, but I'm from Holland so that isn't easy. There are a few people here who can map the Weber management, but none of them do the closed loop fuel control that I really want to have.
So I still believe a closed loop, off the shelf chip for a T34 is my best and easiest option. It's a bit of a shame, because I know the GT3071 live mapped and running full boost would be much nicer. But I'm coming from the standard T3, which is only running about 1.2 bar since it doesn't have a 360 degree bearing, so going to a T34 that is able to run full boost should be quite an improvement already.
07-02-2015, 04:39 PM
#31
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But if the GT3071 is less responsive than a T34.63 and I would limit the boost, what's the point of having the GT3071? I'm Stu would be able to do a safe chip, but it's probably less optimal than the T34.48 chip, as that has been done many many times.
I know a live map would be best, but I'm from Holland so that isn't easy. There are a few people here who can map the Weber management, but none of them do the closed loop fuel control that I really want to have.
So I still believe a closed loop, off the shelf chip for a T34 is my best and easiest option. It's a bit of a shame, because I know the GT3071 live mapped and running full boost would be much nicer. But I'm coming from the standard T3, which is only running about 1.2 bar since it doesn't have a 360 degree bearing, so going to a T34 that is able to run full boost should be quite an improvement already.
I know a live map would be best, but I'm from Holland so that isn't easy. There are a few people here who can map the Weber management, but none of them do the closed loop fuel control that I really want to have.
So I still believe a closed loop, off the shelf chip for a T34 is my best and easiest option. It's a bit of a shame, because I know the GT3071 live mapped and running full boost would be much nicer. But I'm coming from the standard T3, which is only running about 1.2 bar since it doesn't have a 360 degree bearing, so going to a T34 that is able to run full boost should be quite an improvement already.
07-02-2015, 05:15 PM
#32
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But if the GT3071 is less responsive than a T34.63 and I would limit the boost, what's the point of having the GT3071? I'm Stu would be able to do a safe chip, but it's probably less optimal than the T34.48 chip, as that has been done many many times.
I know a live map would be best, but I'm from Holland so that isn't easy. There are a few people here who can map the Weber management, but none of them do the closed loop fuel control that I really want to have.
So I still believe a closed loop, off the shelf chip for a T34 is my best and easiest option. It's a bit of a shame, because I know the GT3071 live mapped and running full boost would be much nicer. But I'm coming from the standard T3, which is only running about 1.2 bar since it doesn't have a 360 degree bearing, so going to a T34 that is able to run full boost should be quite an improvement already.
I know a live map would be best, but I'm from Holland so that isn't easy. There are a few people here who can map the Weber management, but none of them do the closed loop fuel control that I really want to have.
So I still believe a closed loop, off the shelf chip for a T34 is my best and easiest option. It's a bit of a shame, because I know the GT3071 live mapped and running full boost would be much nicer. But I'm coming from the standard T3, which is only running about 1.2 bar since it doesn't have a 360 degree bearing, so going to a T34 that is able to run full boost should be quite an improvement already.
its entirely upto you mate im just pointing out the option I would take.
and I don't believe for 1 second that a gt3071r is less responsive than a t34 0.63.
ive run a gt40 on a 2.6 at over 700 hp and it was more responsive than my old 500 hp yb on a t4, if its available roller bearing I would want it, if you want maximum response go with the smallest turbine housing you can get which is 0.63 I believe, or find a t34 and just fit it just seems a waste to me as you've got to spend anyway so may aswell upgrade while your replaecing it.
07-02-2015, 07:13 PM
#33
Too many posts.. I need a life!!
I run a gt2871r with .48 housing really great unit only run 20psi but gets there by 3,400rpm starts coming on boost @ 2700 rpm. totally standard internals and engine needs a rebuild.
Don't know what max bhp is at 20psi cos not Dyno'd .
Cheers. T
Don't know what max bhp is at 20psi cos not Dyno'd .
Cheers. T
08-02-2015, 09:23 AM
#34
Decisions, decisions... 
So would an air injector kit solve all the issues with possible surge?
I still wonder what has a smaller boost threshold, the T34 or the GT3071r (Cosworth turbine housing is 0.72). Some say the T34, others say the GT.
So would an air injector kit solve all the issues with possible surge?
I still wonder what has a smaller boost threshold, the T34 or the GT3071r (Cosworth turbine housing is 0.72). Some say the T34, others say the GT.
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