jschaefer7406 Posted September 17, 2012 Report Share Posted September 17, 2012 Hello all, Lately I've been considering a 7cm housing for the 15G on my '00 S70 AWD. Car is also running an R mani, with stock exhaust otherwise. Also running a 15psi Woth tune, but not sure that matters here . Installed the 15G in 2009 using using the stock 6cm angled housing from the 13T. Happy with performance and all, and don't rev her that high to really NEED top end breathing. However, with the small 15G (I know, ANY TD04 is small for that matter), boost is very touchy and quick to come on. For example, under part throttle, it may be boosting to 5psi. Only a slight touch of the throttle instantly shoots it to 10 or so. Could this be because of the smaller housing? This may be an ETM problem, as I'm currently sorting that out too... My question is, does the 7cm housing make much difference (enough to justify the swap)? Anyone used both on the same car and can compare? I know the larger housing will make boost come on later and such. Would I regret it on an AWD car, where it needs low end power to get moving? Thanks guys, Joe Link to comment Share on other sites More sharing options...
dublin14 Posted September 17, 2012 Report Share Posted September 17, 2012 Its really nothing upgrade with such a small turbo. Just get a bigger turbo if you can. Link to comment Share on other sites More sharing options...
Big Will Posted September 17, 2012 Report Share Posted September 17, 2012 Hi Joe! I think we have a very similar tune even though my car is a '98 and I use a 15G with the angled 7cm exhaust housing. I've never noticed boost to build too fast but maybe that's more a function of your wastegate setting? I have mine set for 4.0 PSI...you should probably check to see where yours is set to open. Link to comment Share on other sites More sharing options...
jschaefer7406 Posted September 17, 2012 Author Report Share Posted September 17, 2012 Its really nothing upgrade with such a small turbo. Just get a bigger turbo if you can. No plans for anything bigger, being a LPT engine . Hi Joe! I think we have a very similar tune even though my car is a '98 and I use a 15G with the angled 7cm exhaust housing. I've never noticed boost to build too fast but maybe that's more a function of your wastegate setting? I have mine set for 4.0 PSI...you should probably check to see where yours is set to open. Will, Running a 16T actuator set to stock pressure (~4.3 psi). Not saying it builds TOO fast, just that it's very touchy sometimes. As I said, may be a throttle issue. Just have been curious for a while now what difference the larger housing would make Thanks guys, Joe Link to comment Share on other sites More sharing options...
andyb5 Posted September 17, 2012 Report Share Posted September 17, 2012 I think the "touchiness" has to do with the ETM mapping inherent to the ECU. That is where the big difference between yours and Wills car--Wills has a linear relationship between pedal position and TB opening, whereas ETM cars don't. Lots of good info in Lucky's ME7 thread: Specifically in post 84 Lucky provides a stock LPT throttle map versus one he tuned to make the throttle response more linear across the rpm band page__st__80#entry2075295 Link to comment Share on other sites More sharing options...
jschaefer7406 Posted September 17, 2012 Author Report Share Posted September 17, 2012 Specifically in post 84 Lucky provides a stock LPT throttle map versus one he tuned to make the throttle response more linear across the rpm band http://volvospeed.com/vs_forum/topic/151580-ard-tune-me7/page__st__80#entry2075295 Thanks for the info. If I recall, Lucky was referring specifically to those cars being touchy off the line. That is something I have never experienced with mine, even stock... Not sure I'm the best at explaining things . Not that the car feels touchy driving it, just that sometimes its hard to keep it out of boost visually on the gauge (or that boost increases quickly with very little throttle and/or load change, as in the example in my original post). I guess I'm just curious to see who's run both and can compare . Thanks, Joe Link to comment Share on other sites More sharing options...
jschaefer7406 Posted September 29, 2012 Author Report Share Posted September 29, 2012 Anyone else have any more light to shed on this? I know what the theoretical differences are, just looking mostly for opinions from those who've run both and can compare . Thanks, Joe P.S. - Anyone have a 7cm angled housing collecting dust? :) Link to comment Share on other sites More sharing options...
D s50r Posted September 29, 2012 Report Share Posted September 29, 2012 I may have one off of a 04 xc70 I'd be willing to part with for cheap email me and I'll send u pics and we can talk price dsemir@gmail.com Link to comment Share on other sites More sharing options...
jschaefer7406 Posted September 29, 2012 Author Report Share Posted September 29, 2012 I may have one off of a 04 xc70 I'd be willing to part with for cheap email me and I'll send u pics and we can talk price dsemir@gmail.com Emailed Joe Link to comment Share on other sites More sharing options...
cgally Posted September 30, 2012 Report Share Posted September 30, 2012 I have a ported 7cm housing I never ended up using. Link to comment Share on other sites More sharing options...
jschaefer7406 Posted September 30, 2012 Author Report Share Posted September 30, 2012 I have a ported 7cm housing I never ended up using. PM sent Joe Link to comment Share on other sites More sharing options...
cgally Posted September 30, 2012 Report Share Posted September 30, 2012 pm replied Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.