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Hi I have a GT3076Rwg on my Saab 9000 but the compressor housing is 0.50a/r and the turbine is a 0.86 so externally looks pretty much the same as a 0.86 GT3071Rwg, but the compressor wheel is 76mm and the part numbers have it down as a GT3076R....so its definitely a 3076!! (confusing as hell to me this stuff!!) Here's a 0.86 GT3071Rwg:  Here's mine:        But pretty much all the other 3076 ones I've seen have the 0.70 compressor housing (which I 'think' is the same as the GT35R uses?)  Would I see any gains by fitting the 0.70 compressor housing to mine or isn't it worth the effort and extra £££? Has anyone done this with theirs and did you notice much more turbo lag or any more power? I'm fitting a tubular manifold next month so was thinking of doing this housing swap at the same time. Any help/info appreciated:) Thanks in advance, Dave. |
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In theory, going from a 0.5 compressor housing, to 0.7 housing, will raise the boost threshold a bit (it's pretty much 50% larger area) so lag will increase, theoretical top bhp will improve, as it can flow much more air... but only if the compressor wheel can support the needed airflow requirements.
If it were me, I'd see if I could borrow one for a week or so, to see how it affected the engine/driveability - then either buy one, or just go back to your original jobbie
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You're like a crazy backyard genius! |
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The 30 in your GT30 refers to the turbine size (its not 30mm, its just a number associated with that size of turbo) and the 76 is the compressor wheel diameter in mm. You could have all sorts of different compressor A/R’s on there and it would still be a GT3076. The R means ball bearing and the WG is for wastegate.
If you change the compressor A/R and leave everything else the same (compressor wheel size and trim, turbine size/trim/AR, wastegate opening pressure) I would be very surprised if you find any detectable difference when driving. The A/R tends to be optimised for the design and size of wheel you have got so the benefit to playing tunes on it alone are questionable. As ChCh says, in theory it could flow more air but if you don't change the wheel as well its unlikely to need to.
As for borrowing another one, if it has not been machined internally to the same trim as your existing wheel it‘ll be no good so I would take care with that.
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Thanks for the replies, there's no mega rush to do this as it's not getting taken off for a month anyway. Just trying to get more info on it. My thinking behind it was if the new tubular reduces lag by a few hundred rpm (some have seen 3/400rpm off here) but its given some decent gains up top, then fitting the 0.70 ar housing will probably be just as laggy as it is now in the 0.50 but the extra .20 ar will give more power again up top. So I'll be in around the same boat as I am now ref the spool up time but have a load more power up top with the new combined tubular & 0.70 compressor housing. (best way I can describe it!) I'm just guessing wildly here! My mechanical know how isn't that great tbh!! Theres not much info on it as mostvof the guys just stick with the 3071 0.64 or 0.86 so not many have tried out the different compressor housing. All I know is my mates old 9-3 with a gt3071rwg 0.64 which had the larger 0.70ar compressor housing fitted was neck and neck with mine from 60 to around 140. Nothing in it  Collecting the tubular tomorrow!! Can't wait to fit it!! |
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froggy
Posted a lot
Posts: 1,099
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you may see a drop in back pressure at the top end which will show up as slightly lower egt but wether that translates to better flow at the same pressure ratio is another matter .worth a try if you have the housing already . probably need to measure egt and back pressure to note any changes
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The compressor wheel makes power/airflow... the compressor housing just kinda directs it. As for the borrowing bit, I meant a complete turbo  lol |
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You're like a crazy backyard genius!
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froggy
Posted a lot
Posts: 1,099
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didnt read it properly thought you meant turbine housing
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30psi
Posted a lot
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Do you get any issues with boost spiking with the internal waste gate?
I've got a GT3076R on my Datsun, but with an external wastegate.
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1962 Ford Thunderbird 6.4L
1981 Datsun Bluebird SSS CA18DET
1981 Datsun Bluebird SSS SR20DE
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Nothing yet mate but I'm still down on 0.2/0.3 bar at the moment. Will get it looked at again in Jan when I fit the tubular.
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lol