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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#838425
26/05/2009 10:39
26/05/2009 10:39
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Joined: Dec 2005
Posts: 3,158 Near Reading
JohnS
I need some sleep
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I need some sleep
Joined: Dec 2005
Posts: 3,158
Near Reading
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Not sure there is much point in a GT3071R on your car, you can make more power on your current setup with headwork so it seems a pointless exercise.
Nigel, your best option is probably an external wastegate and a decent equal length manifold not a bigger turbo if you want the lag to be no worse.
Former low boost hero - 616BHP@1.5 bar. 2.4 20VT RIP
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#838479
26/05/2009 12:11
26/05/2009 12:11
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Joined: Dec 2005
Posts: 17,367 Staffordshire
Nigel
Forum veteran
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Forum veteran
Joined: Dec 2005
Posts: 17,367
Staffordshire
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VGT isn't an option - I've spoken with turbo Dynamics this morning I'm faced with the traditional choice of better top end taking some bottom-end tractability away I love the top-end rush of a big turbo, but I'm not willing to suffer any worse lag than I currently get, so it would appear that I may still have my ideal turbo John - thanks for the suggestions - I know that your transition to external wastegate was rewarded with a jump in power, so maybe this is the way to go - I'll empty the piggy bank to see what's in there I await Luke's results with eager anticipation...
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: JohnS]
#838684
26/05/2009 17:23
26/05/2009 17:23
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suba
Unregistered
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suba
Unregistered
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I thought a ported shroud helped with surge? If anything I was under the impression that it increased spool slightly (as in later in the rev range)?
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#838864
26/05/2009 21:56
26/05/2009 21:56
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luke
Unregistered
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luke
Unregistered
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the gt30 is on tbh its no biggy if i end up finding the gt30 is overkill as to put it. . . . il just sell and get smaller turbo but untill thursday afternoon after ive been back to leighton for fueling tweaking. i wont know what its like as ive hardly even went on boost earlier today on way home from nobbys due to not knowing how AFR been affected!?
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#838866
26/05/2009 21:57
26/05/2009 21:57
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eldinho
Unregistered
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eldinho
Unregistered
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have you ported the wastegate?
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#838892
26/05/2009 22:26
26/05/2009 22:26
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luke
Unregistered
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luke
Unregistered
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you make it sound soo easy no and how would i?
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#838899
26/05/2009 22:30
26/05/2009 22:30
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eldinho
Unregistered
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eldinho
Unregistered
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the 3071R has been known to boost spike as the wastegate can't control the boost, this can be cured by porting the wastegate. You can do it yourself, but I sent mine off to Turbo Dynamics so I knew it was getting done properly (and because I'm lazy)
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#838907
26/05/2009 22:36
26/05/2009 22:36
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luke
Unregistered
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luke
Unregistered
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how much did that cost if you dont mind me asking?
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#838909
26/05/2009 22:38
26/05/2009 22:38
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eldinho
Unregistered
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eldinho
Unregistered
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£80 I think, I got the compressor shroud polished whilst I was at it which was an extra £10-15!
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#838923
26/05/2009 22:58
26/05/2009 22:58
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MiniPit
Unregistered
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MiniPit
Unregistered
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the 3071R has been known to boost spike as the wastegate can't control the boost, this can be cured by porting the wastegate. You can do it yourself, but I sent mine off to Turbo Dynamics so I knew it was getting done properly (and because I'm lazy) Right. Especially if Luke wants to run low or mid boost Like Leighton advised me, if you are going to run high boost you don't care about boost creep... but if you don't want more than 1.2/1.3 bar you'll probably need a little porting.
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#838967
27/05/2009 00:08
27/05/2009 00:08
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TurboJ
Unregistered
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TurboJ
Unregistered
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Mine creeps up to 1.7Bar without the porting but that’s with a 3” system. So I can't hold less than 1.7Bar to redline at WOT even if it set the boost to 1Bar. If this is the case with the GT30 with you exhaust then you are in trouble if your aiming for 1.4MAX.
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#838969
27/05/2009 00:11
27/05/2009 00:11
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eldinho
Unregistered
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eldinho
Unregistered
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which turbo is that with J?
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#838971
27/05/2009 00:17
27/05/2009 00:17
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TurboJ
Unregistered
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TurboJ
Unregistered
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#839012
27/05/2009 06:42
27/05/2009 06:42
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Jari
Unregistered
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Jari
Unregistered
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Hi,
I don't have any problems with boost creep what so ever with GT3071R-WG 0.86 turbine housing. With the 0.64 housing I have heard that to happen.
I use Apexi AVC-R and it can handle programmed boost level without problems. For example at the moment I ran "only" with steady 1.3 bar boost and the variation is only some 0.2 bar vs. set boost value.
-Jari-
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#839044
27/05/2009 08:53
27/05/2009 08:53
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luke
Unregistered
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luke
Unregistered
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rog, no not booked for rolling road on thursday but will arrange one very soon. Just need to know fueling is perfect for whatever boost my setup allows me to run then after that it will be down to engine holding out. im using blitz boost controller and am pretty sure it will keep good tabs on any serious boost spikes as it will cut boost if it tries goin over 1.5bar so we shall see if it keep cutting my boost i know whats trying to happen.
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#839070
27/05/2009 09:37
27/05/2009 09:37
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eldinho
Unregistered
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eldinho
Unregistered
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I know Matty was having problems until he ported the wastegate. Did Fergie not have the same problem aswell? Where has Fergie gone?
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: Flea]
#839084
27/05/2009 10:05
27/05/2009 10:05
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eldinho
Unregistered
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eldinho
Unregistered
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Panic over!
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: Flea]
#839091
27/05/2009 10:16
27/05/2009 10:16
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TurboJ
Unregistered
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TurboJ
Unregistered
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I would say TurboJ your problem lies elsewhere as that is an extreme case of boost creep! Who said I have a problem . It is down to the fact that I have a 3" free flowing exhaust. Less back pressure more chance of boost creep. Porting the WG will simply solve this or revert back to my old 2.5" system. My case is a bit extreme but the point I am making is that IF luke does encounter creep it will be a problem whereas mine is fine because I’m mapped to 2Bar.
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#839140
27/05/2009 11:18
27/05/2009 11:18
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Joined: Dec 2005
Posts: 3,158 Near Reading
JohnS
I need some sleep
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I need some sleep
Joined: Dec 2005
Posts: 3,158
Near Reading
|
I thought a ported shroud helped with surge? If anything I was under the impression that it increased spool slightly (as in later in the rev range)? It does help with surge but it depends on the design if it increases or improves spool. The more old school ported shrouds just move the whole volumetric efficiency of the turbo (i.e. moved the whole compressor map to the right) but there are some modern designs out there that spread it/stretch it. Mine was proven to improve spool as I did do a before and after. I wouldn't buy a turbo without it now tbh. It isn't just a case of polishng the shroud, although that itself can improve spoolup slightly. It is basically adding a seperate port between the compressor cover and where the majority of the air goes in. The designs vary quite widely - mine is basically a totally seperate cone sitting inside the standard shroud. I think a lot of you are missing a trick with some of the options around the compressor housing - be it porting or the availability of larger compressor housings like the T04S style 0.70A/R housing. It's all well and good being a bolt on king but you can get more bng for your buck if you think a bit more about your options.
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: JohnS]
#839159
27/05/2009 11:44
27/05/2009 11:44
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MiniPit
Unregistered
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MiniPit
Unregistered
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This can be a good idea to avoid boost creep too : http://www.atpturbo.com/Merchant2/mercha...tegory_Code=GTHBut something seems to be wrong with this. If this part is exactly like on the pics i think it won't fit on our cars. The "hole" on the housing is going to be in front of the engine And WG will be impossible to fit. An "opposite" version of this part would be great!
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#839171
27/05/2009 11:57
27/05/2009 11:57
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westcoupe
Unregistered
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westcoupe
Unregistered
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i had know problems with boost creep,i found if i turned my avcr off my car would run 0.7bar to the redline,its all down to your actuator really
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Re: Gt28rs . . . .. . . Tooooo . . . . . . GT3071R
[Re: ]
#839188
27/05/2009 12:18
27/05/2009 12:18
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Joined: Feb 2006
Posts: 5,390 Essex
Trappy
Forum is my life
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Forum is my life
Joined: Feb 2006
Posts: 5,390
Essex
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I buying Luke's GT28RS and now wondering if it would be worth having any work down to it prior to fitting. What do we think then guys?
F****** b****** thing...
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