I want 400bhp and a good torque figure, but.... i want it to last
22 September 2003, 06:39 PM
#62
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Tweenie,
I only know of two of the Garretts mounted on the VF exhaust housing as you describe.
Indeed one was mapped very recently and I saw the graphs. Both of them produced solidly in the 390bhp bracket. One of them did this at just over 1.2bar and so there is potentially more to come.
These are great results on the standard Subaru fitting - however moving to a full GT Series will probably give better results especially if you are looking for more torque.
Cheers,
Rannoch
I only know of two of the Garretts mounted on the VF exhaust housing as you describe.
Indeed one was mapped very recently and I saw the graphs. Both of them produced solidly in the 390bhp bracket. One of them did this at just over 1.2bar and so there is potentially more to come.
These are great results on the standard Subaru fitting - however moving to a full GT Series will probably give better results especially if you are looking for more torque.
Cheers,
Rannoch
22 September 2003, 07:27 PM
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Now i'm lost!!
I can understand the more boost principle, but why not run more boost on the hybrid?? fair enough if we are talking 2bar of boost, but if we are only talking 1.4 say, then if i want to up the boost i can do with the hybrid still
I thought you were going to go along the lines of exh flow or something?
Rob
I can understand the more boost principle, but why not run more boost on the hybrid?? fair enough if we are talking 2bar of boost, but if we are only talking 1.4 say, then if i want to up the boost i can do with the hybrid still
I thought you were going to go along the lines of exh flow or something?
Rob
22 September 2003, 07:29 PM
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What i mean is that i was thinking that you could bring the torque figure up with a full GT, but running the same kind of power.
Rob
Rob
22 September 2003, 07:33 PM
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With the full GT you could probably pull the boost in earlier ?
I say 'probably' because I don't know of one that will do this on a 2.0 scoob AND run over 400 bhp.
I presume there are little ones available though ?
I say 'probably' because I don't know of one that will do this on a 2.0 scoob AND run over 400 bhp.
I presume there are little ones available though ?
22 September 2003, 07:37 PM
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I see, but using a bigger garrett will have surge issues on a 2lt as per TD06??
Rob
p.s. out of interest, you say that the 06 is only good for 450bhp due to the 05 exh housing, what is the 06 exh housing like??
Rob
p.s. out of interest, you say that the 06 is only good for 450bhp due to the 05 exh housing, what is the 06 exh housing like??
22 September 2003, 07:44 PM
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06 turbine is an easy swap but it is relatively BIG and would be laggy on the scoob with the big manifold. I estimate you'd be up at 3700-3800 before getting 1 bar. The 20G wheel would still limit the power to 460 ish so you would end up with a narrower power band....... but your car would feel faster as it comes in later with a surge
22 September 2003, 10:23 PM
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By running more boost ?
as you so gracefully pointed out to me recently I did not understand the relative merit of air flowed v. boost. My comment related to two things - a full Garrett, at least of the type I have in mind - will flow more air.
It will also achieve this at relatively low boost and spool up when sized correctly will be very early.
You are quite correct tho - I am not aware of anyone who has tried a GT series on a 2.0l properly - the results could be interesting.
Amusingly we were going to try one on my car for TOTB II - but I was ill when I came back from India and ran out of time. The main issue is sorting out very different pipework - uppipe, downpipe, FMIC pipe, inlet, etc. HOwever the opportunity has passed and I will leave it to someone else to give it a go.
Rannoch
22 September 2003, 10:33 PM
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For some reason I can't edit on this PC - however I just wanted to add that on slightly larger displacement Scoobs the GT is not suffering from surge with boost pressures of around 2.0bar at 3,500rpm - we just need someone to try it on a 2.0l as Andy says.
Rannoch
Rannoch
22 September 2003, 10:36 PM
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You're quite right David 
but in the case of the Garrett GT Vs the 20G I believe there is only 1% compressor efficiency at best to be gained, (from the maps I've seen) hence my point re increasing boost to provide more airflow.
The difference in efficiency between the 20G and the earlier garretts or the 16g as fitted to a std TD05 can be 5% - 7% and this is where the extra flow comes from at the same boost.
Andy
but in the case of the Garrett GT Vs the 20G I believe there is only 1% compressor efficiency at best to be gained, (from the maps I've seen) hence my point re increasing boost to provide more airflow.The difference in efficiency between the 20G and the earlier garretts or the 16g as fitted to a std TD05 can be 5% - 7% and this is where the extra flow comes from at the same boost.
Andy
23 September 2003, 07:36 AM
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Andy,
it is - and spool up on the road will be 3-400rpm later - based on comparitive experience.
However the crucial point is that such high levels of airflow are being acheived with no surge at all, foot on brake or not. But this is on 2.33s and 2.5s - although all these turbos are sized at over 500bhp.
What we need to try is an appropriately sized Garrett on a 2.0l and to see what results can be obtained - as this is not a direct comparison.
Rannoch
it is - and spool up on the road will be 3-400rpm later - based on comparitive experience.
However the crucial point is that such high levels of airflow are being acheived with no surge at all, foot on brake or not. But this is on 2.33s and 2.5s - although all these turbos are sized at over 500bhp.
What we need to try is an appropriately sized Garrett on a 2.0l and to see what results can be obtained - as this is not a direct comparison.
Rannoch
23 September 2003, 10:29 AM
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I'd be interested in the results the EVO's are getting good results on a 2.0 but I don't know how much effect our crappy manifolds have ?
Andy
the EVO's are getting good results on a 2.0 but I don't know how much effect our crappy manifolds have ?Andy
23 September 2003, 11:09 AM
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Completely off topic, but....
Have any of you guys ever considered writing a book about Impreza modding?
Seriously here, not taking the p1ss. You'd make a fortune!
I'd definately buy it.
Cheers
Rich
Have any of you guys ever considered writing a book about Impreza modding?
Seriously here, not taking the p1ss. You'd make a fortune!
I'd definately buy it.
Cheers
Rich
23 September 2003, 08:07 PM
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Things seem to get a bit strange anywhere south of Yorkshire
Scared!
Rannoch
23 September 2003, 10:43 PM
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No - that occured during my ten years in Edinburgh!
Anyway - I thought you were supposed to be on holiday?
Rannoch
PS Have you sold that car yet now you have detuned it?
Anyway - I thought you were supposed to be on holiday?
Rannoch
PS Have you sold that car yet now you have detuned it?
23 September 2003, 11:43 PM
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you should have a look at octobers issue of jap performance there is an sti7 with a reliable 404bhp engine built by roger clarke motorsport, check it out its raelly informative!
24 September 2003, 09:38 AM
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David
Holiday delayed for the time being, car not detuned yet as I've been layed up after fookin my back changing the gearbox (again)
So might just pop down to Scooby Shootout to see how slow it is compared to the "monsters"
You will be ready, yes ?
Andy
Holiday delayed for the time being, car not detuned yet as I've been layed up after fookin my back changing the gearbox (again)
So might just pop down to Scooby Shootout to see how slow it is compared to the "monsters"
You will be ready, yes ?
Andy
