BrenTuning Posted December 27, 2012 Share Posted December 27, 2012 We dyno tuned (2) Legacy GT's the same day last year. They had nearly IDENTICAL mods except for one thing (turbo and headers) Both ran the same peak boost and used the exact same ramp rate for spool up which is locked in shootout mode. The higher graph represents a tuned VF52 car, with Racer X FMIC/intake and stock headers, stock fuel. The lower graph represents a tuned VF46 car, with Racer X FMIC/intake, stock fuel and unwrapped tubular headers. A tad too close for a additional consistent 35whp and 48wtq? Let the results speak for themselves: http://i769.photobucket.com/albums/xx332/brentuning/bren05lgtvf48vsvf40car.jpg Link to comment Share on other sites More sharing options...
Bonafide P Posted December 27, 2012 Share Posted December 27, 2012 Wow. Link to comment Share on other sites More sharing options...
LosAngelesLGT Posted December 27, 2012 Share Posted December 27, 2012 Just goes to show, numbers don't mean crap, its all about the powerband. Happy Holiday! Good to have you with us btw. Link to comment Share on other sites More sharing options...
fahr_side Posted December 27, 2012 Share Posted December 27, 2012 Both ran the same peak boost and used the exact same ramp rate for spool up which is locked in shootout mode. Does that mean the VF-46 would have spooled faster if ramp rate were not locked? Humor me, I'm just not familiar with 'shootout mode'. Thanks. Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs. Link to comment Share on other sites More sharing options...
BrenTuning Posted December 27, 2012 Author Share Posted December 27, 2012 Does that mean the VF-46 would have spooled faster if ramp rate were not locked? Humor me, I'm just not familiar with 'shootout mode'. Thanks. Ramp rate is how the load is being applied to the vehicle. Shootout mode puts this into a fixed rate as to not skew the results between different vehicles. In "regular" mode the operator can change this setting manually. Link to comment Share on other sites More sharing options...
BrenTuning Posted February 25, 2013 Author Share Posted February 25, 2013 Here's another we just did last week. Baseline is our Stage2 stock tmic tune. Owner's VF40 died out (150k+ mile car). All he did was replace the VF40 with a VF52. There's more in it with the addition of a upgraded intercooler. The stock BPV was leaking pretty bad as well. 200rpm Spool difference between turbos http://i152.photobucket.com/albums/s174/Nrw7/IMG955254_zps7e694b55.jpg Link to comment Share on other sites More sharing options...
Mootsfox Posted March 10, 2014 Share Posted March 10, 2014 I'm in the same state right now as your customer (150k+ on the stock failing VF40, Stage II everything else). I think you just sold me on a new VF52 Link to comment Share on other sites More sharing options...
BrenTuning Posted March 10, 2014 Author Share Posted March 10, 2014 You're welcome, and enjoy! Link to comment Share on other sites More sharing options...
fstaslp Posted March 10, 2014 Share Posted March 10, 2014 That is on stock fueling? Looks like a nice upgrade until I can get a pump and injectors for corn juice! Link to comment Share on other sites More sharing options...
BrenTuning Posted March 10, 2014 Author Share Posted March 10, 2014 Stock fuel on all the cars listed in here. Link to comment Share on other sites More sharing options...
NAL_LGT Posted June 26, 2014 Share Posted June 26, 2014 Stock fuel on all the cars listed in here. So it seems to me the VF52 can deliver greater peak numbers above 3000 RPM but you sacrifice spool rate. So more power but also more turbo lag. Correct? Link to comment Share on other sites More sharing options...
BrenTuning Posted June 28, 2014 Author Share Posted June 28, 2014 They spool about 200rpm slower and make more power everywhere once in boost compared to the VF40/46. A VF52/16g is the best option for someone looking for a power increase without adding any noticeable lag. Link to comment Share on other sites More sharing options...
NAL_LGT Posted July 4, 2014 Share Posted July 4, 2014 Thank you for the response. Good to know. Is it possible through tuning to improve how early it spools, especially if you have a catless dp? Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
DeltaNu1142 Posted July 4, 2014 Share Posted July 4, 2014 Great posts! This is the course of your work, but you aren't obligated to share... it's appreciated. Tits mcgee Link to comment Share on other sites More sharing options...
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