Guest Posted December 21, 2009 Share Posted December 21, 2009 Ok, so I finally decided to take the car for a dyno tune at EFI Logics. Car was previously road tuned by a friend with excellent results, but Chris was able to extract some more power and make the car feel smoother. Btw, he is an excellent tuner and provides great customer service. Highly recommended. Relevant mods: VF36 twinscroll ball-bearing turbo w/GT2871 compressor wheel (same wheel as in AVO380) w/15 lbs. AVO wastegate actuator, JDM STI twinscroll EL headers/uppipe, AVO catted downpipe, Perrin Y-mid with extra straight-thru Mangaflow muffler welded in, STI quad-tip cans, AVO CAI, Perrin inlet, 08 STI intake manifold/TMIC, TGV deletes, DW 740cc injectors, AVO fuel pump, Prodrive BCS. 08 STI 6MT transmission - 4th gear pulls on the graph. The numbers are not too impressive, although this is not an optimistic dyno (stock STI puts 240 whp on it) - 292 whp peak (note the graph is corrected, it put 310 whp uncorrected, but it was pretty cold day, probably less than 40F in the dyno bay), but the power band is really nice. The car responds incredibly quickly and is a hoot to drive. Chris said something is holding the turbo back, likely restrictive exhaust (I wanted to swap the quad-tips for stright-thru Prodrives, but didn't have time to do it). Dotted lines are the baseline, solid lines are the final tune. The info has been also uploaded into their dyno database. http://i150.photobucket.com/albums/s108/wujek1976/dyno.jpg Comparison with 2008 SpecB stock (comparision should be made with SpecB because of the 6MT tranny): http://www.efilogics.com/dyno/graph.php?gb=1&hp=1&torque=1&rpm=1&sl=1&sln=1&runid1=681&rgb1=000000255&runid2=120&rgb2=204000000 And versus EFI's shop stage II SpecB: http://www.efilogics.com/dyno/graph.php?gb=1&hp=1&torque=1&rpm=1&sl=1&sln=1&runid1=681&rgb1=000000255&runid2=287&rgb2=204000000 And a comparison vs. an AVO380 on a 09 WRX (not clear what intercooler it used): http://www.efilogics.com/dyno/graph.php?gb=1&hp=1&torque=1&rpm=1&sl=1&sln=1&runid1=681&rgb1=000000255&runid2=627&rgb2=204000000 Link to comment Share on other sites More sharing options...
Darkness of Death Posted December 21, 2009 Share Posted December 21, 2009 that's not bad. the dyno i pulled on, an STi pulls only 198whp why didnt' you pull on 3rd? Link to comment Share on other sites More sharing options...
Guest Posted December 21, 2009 Share Posted December 21, 2009 With the 6MT gearing typically the 4th gear is used in dyno tuning. Link to comment Share on other sites More sharing options...
Darkness of Death Posted December 21, 2009 Share Posted December 21, 2009 i think my pulls were with 3rd (6mt) Link to comment Share on other sites More sharing options...
JoeFromPA Posted December 21, 2009 Share Posted December 21, 2009 Looks like a beaut UM. It's showing peak torque hitting at ~3200 rpms....how big is this turbo compared to the JDM LGT twinscroll? If I'm reading you right, you are hitting 300 whp on a twinscroll BB turbo with, essentially, an opened up exhaust, better inlet, CAI, and fuel support. No upgraded intercooler, pump gas.....? Really nice. Joe Link to comment Share on other sites More sharing options...
Guest Posted December 21, 2009 Share Posted December 21, 2009 The compressor wheel in theory is 44 lbs/min (20g size), but is limited by the compressor housing (stock VF36) and probably the exhaust housing. This is much bigger turbo than stock JDM LGT, even without the upgraded wheel. The stock wheel is VF39/VF52 size. This is pump (93) gas. It has upgraded intercooler - 08 STI intake manifold and 08 STI stock intercooler. Link to comment Share on other sites More sharing options...
ScoobySTi07 Posted December 21, 2009 Share Posted December 21, 2009 Great numbers man. It seems unlikely that the mufflers are the restriction but maybe. Looking at the rest of your upgrades I'm having a tough time seeing where the restriction might be. Could be the cat. Did you go with AVO's ceramic or metal cat? Does Boston require emissions tests? The Ridiculousness is no more But you can have your very own piece of it. **The Ridiculous Part Out.** Link to comment Share on other sites More sharing options...
Guest Posted December 21, 2009 Share Posted December 21, 2009 Metal cat. But it's close to the turbo, so maybe that's not helping. I'll swap the muffers and have it retuned (also with alcohol injection, so we will see). Link to comment Share on other sites More sharing options...
ScoobySTi07 Posted December 21, 2009 Share Posted December 21, 2009 The metal cat is the higher flowing of the two but yeah you could still be seeing some back pressure build up especially with where AVO put the cat. Have fun with the meth. Just don't blown anything up. The Ridiculousness is no more But you can have your very own piece of it. **The Ridiculous Part Out.** Link to comment Share on other sites More sharing options...
Guest Posted December 21, 2009 Share Posted December 21, 2009 The metal cat is the higher flowing of the two but yeah you could still be seeing some back pressure build up especially with where AVO put the cat. Have fun with the meth. Just don't blown anything up. Should take it... Link to comment Share on other sites More sharing options...
ScoobySTi07 Posted December 21, 2009 Share Posted December 21, 2009 Should is always a fun word. The Ridiculousness is no more But you can have your very own piece of it. **The Ridiculous Part Out.** Link to comment Share on other sites More sharing options...
LittleBlueGT Posted December 21, 2009 Share Posted December 21, 2009 I am in for some road logs, I can learn more form them. If you want to check back pressure in the exhaust, you can do it for about $20. Get a MPT - barb hose adapter, some heat resistant hose, and a cheap pressure gauge (up to 15 psi for good resolution). Then run the hose through an open window, in the car have the gauge, in the DP (where the O2 sensor would normally go) thread in the adapter. Quickly go out and do a WOT run. I did this, and got in about 5 WOT runs before the heat killed the gauge. At WOT above about 4000 rpm my relative pressure in the DP was 4-5 psi. It was pretty consistent. I don't know if that is good or bad, but it gives you a starting point. Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
f1anatic Posted December 21, 2009 Share Posted December 21, 2009 very nice numbers...and i bet no noticeable lag. Link to comment Share on other sites More sharing options...
Guest Posted December 21, 2009 Share Posted December 21, 2009 No, no lag, really, this thing flies. Full boost at ~2900k rpm in 4th. Even in 2nd or 3rd, punching it at 3k makes it take off right away. Link to comment Share on other sites More sharing options...
Guest Posted December 21, 2009 Share Posted December 21, 2009 I am in for some road logs, I can learn more form them. If you want to check back pressure in the exhaust, you can do it for about $20. Get a MPT - barb hose adapter, some heat resistant hose, and a cheap pressure gauge (up to 15 psi for good resolution). Then run the hose through an open window, in the car have the gauge, in the DP (where the O2 sensor would normally go) thread in the adapter. Quickly go out and do a WOT run. I did this, and got in about 5 WOT runs before the heat killed the gauge. At WOT above about 4000 rpm my relative pressure in the DP was 4-5 psi. It was pretty consistent. I don't know if that is good or bad, but it gives you a starting point. Thanks. For some time I was thinking about getting exhaust backpressure tester. Just ordered [ame=http://www.amazon.com/gp/product/B0002SQW9S/ref=oss_T15_product]one[/ame], we'll see what it reads. Link to comment Share on other sites More sharing options...
j255c Posted December 21, 2009 Share Posted December 21, 2009 kudus for trying somethign new, but now you should get a gt30 w/ a .63 housing have almost the same spool and much more power. You have the setup to handle everything, i'd go bigger 06 TB EVO IX SE stock turbo monster subaru hater Link to comment Share on other sites More sharing options...
Guest Posted December 21, 2009 Share Posted December 21, 2009 Dyno data have been added to their database, edited post #1 to show comparison to stock SpecB. Link to comment Share on other sites More sharing options...
Guest Posted December 21, 2009 Share Posted December 21, 2009 kudus for trying somethign new, but now you should get a gt30 w/ a .63 housing have almost the same spool and much more power. You have the setup to handle everything, i'd go bigger The spool won't be nowhere near "almost the same". Can't defy physics. However I am planning on GT35R rotated twinscroll on my other LGT eventually. Link to comment Share on other sites More sharing options...
Spec B Posted December 21, 2009 Share Posted December 21, 2009 Looks good! I am impressed with how well it holds up top. Nice setup! Link to comment Share on other sites More sharing options...
JMLegacy Posted February 18, 2013 Share Posted February 18, 2013 So ...how did it hold up? Link to comment Share on other sites More sharing options...
Guest Posted February 10, 2017 Share Posted February 10, 2017 So ...how did it hold up? Fine, actually... Link to comment Share on other sites More sharing options...
LatentWagen Posted February 10, 2017 Share Posted February 10, 2017 Fine, actually... ~3yrs later LW's spec. B / YT / IG Link to comment Share on other sites More sharing options...
Guest Posted February 10, 2017 Share Posted February 10, 2017 ^ Link to comment Share on other sites More sharing options...
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