mycotopian Posted August 5, 2005 Share Posted August 5, 2005 I am getting a custom tune and with the 20g power levels my tuner is suggesting I replace the stock airbox. Are there any options for a cold air intake yet? What other short rams are there besides the Perrin? Link to comment Share on other sites More sharing options...
Xenonk Posted August 5, 2005 Share Posted August 5, 2005 Blitz, GPMoto, Zerosports, etc... Keefe Keefe Link to comment Share on other sites More sharing options...
AWDxBOOST Posted August 5, 2005 Share Posted August 5, 2005 dont worry about gettin a cai...just a shorty will do fine its not about the intake for cooler temps, its the intercooler Link to comment Share on other sites More sharing options...
firedawgs Posted August 5, 2005 Share Posted August 5, 2005 K&N, Perrin a couple of more choices. Updated my vBGarage: Link to comment Share on other sites More sharing options...
dark_rex Posted August 5, 2005 Share Posted August 5, 2005 dont worry about gettin a cai...just a shorty will do fine its not about the intake for cooler temps, its the intercooler +1 Link to comment Share on other sites More sharing options...
sc 540i Posted August 5, 2005 Share Posted August 5, 2005 dont worry about gettin a cai...just a shorty will do fine its not about the intake for cooler temps, its the intercooler CAI = Not teh win on these cars. Link to comment Share on other sites More sharing options...
al-gorithm Posted August 5, 2005 Share Posted August 5, 2005 Wouldn't having a colder charge in the first place help the efficiency of the IC? Ex. instead of cooling 100 degree air with a WAI you would be cooling 70 degree air with a CAI. I just think that a colder charge from a CAI would keep the overall IC temp lower as it is easier to cool something that is already at a lower temperature. Or is the IC always so damn hot that it doesn't make a difference? Anyone got any dyno evidence? Hell, just buy the CAI and borrow a WAI and dyno both. Link to comment Share on other sites More sharing options...
dark_rex Posted August 5, 2005 Share Posted August 5, 2005 Wouldn't having a colder charge in the first place help the efficiency of the IC? Ex. instead of cooling 100 degree air with a WAI you would be cooling 70 degree air with a CAI. I just think that a colder charge from a CAI would keep the overall IC temp lower as it is easier to cool something that is already at a lower temperature. Or is the IC always so damn hot that it doesn't make a difference? Anyone got any dyno evidence? Hell, just buy the CAI and borrow a WAI and dyno both. no because the turbo runs so hot, that lower turbo inlet temps are elminated by the immense heat created by compression and proximity to 1450degree exhaust temperatures. check out clubwrx.net for a billion discussions on this, and data logging to boot. dR Link to comment Share on other sites More sharing options...
AWDxBOOST Posted August 5, 2005 Share Posted August 5, 2005 no because the turbo runs so hot, that lower turbo inlet temps are elminated by the immense heat created by compression and proximity to 1450degree exhaust temperatures. check out clubwrx.net for a billion discussions on this, and data logging to boot. dR exactly...itll just get hot again right after the intake Link to comment Share on other sites More sharing options...
al-gorithm Posted August 5, 2005 Share Posted August 5, 2005 thanks for clearing that up... maybe spend the money on an IC sprayer... Link to comment Share on other sites More sharing options...
PhilT Posted August 5, 2005 Share Posted August 5, 2005 no because the turbo runs so hot, that lower turbo inlet temps are elminated by the immense heat created by compression and proximity to 1450degree exhaust temperatures. check out clubwrx.net for a billion discussions on this, and data logging to boot. dR As a rule of thumb, for every degree you can lower the air temp going into the turbo, the air leaving the turbo will drop by the same amount, and the exhaust temps will drop by twice that. I seem to remember that PVT (pressure x volume x temp) before compression will equal PVT after compression, less any heat losses to the surroundings. Therefore the air entering the IC will drop also, giving a denser charge of air. How this theory works on the Legacy I couldn't say as you would need to put temp sensors into the air flow, but I have done alot of work on marine engines and proven this time and again. It is possible that the differences are so negligable it's not worth the expense to gain a small amount, but there will be some gain. Double Award Winning Legacy GT Wagon Link to comment Share on other sites More sharing options...
meier motor sports Posted August 6, 2005 Share Posted August 6, 2005 As a rule of thumb, for every degree you can lower the air temp going into the turbo, the air leaving the turbo will drop by the same amount, and the exhaust temps will drop by twice that. I seem to remember that PVT (pressure x volume x temp) before compression will equal PVT after compression, less any heat losses to the surroundings. Therefore the air entering the IC will drop also, giving a denser charge of air. How this theory works on the Legacy I couldn't say as you would need to put temp sensors into the air flow, but I have done alot of work on marine engines and proven this time and again. It is possible that the differences are so negligable it's not worth the expense to gain a small amount, but there will be some gain. good answer Link to comment Share on other sites More sharing options...
al-gorithm Posted October 11, 2005 Share Posted October 11, 2005 What are typical air temps encountered on STi's and WRXs i.e. before and after the intercooler. How much cooler charge, in theory, would a FMIC provide? Link to comment Share on other sites More sharing options...
KTM 525 Posted October 12, 2005 Share Posted October 12, 2005 I've seen figures of over 220 degrees exiting the turbo (hot enough to boil water). A good IC will bring the temps back down to ambient. Link to comment Share on other sites More sharing options...
RidinLow Posted October 31, 2005 Share Posted October 31, 2005 SPT shorty intake will be available sometime between the 1st and 2nd quarter of 06. Absolutely no issues with warranty and it doesn't screw with the AFR either. It'll even be dealer installable for those of you who don't like to turn wrenches. Fits OBXT and LGT. For those of you with the other cars, an application for WRX/STI/FXT will be launched at the same time as well. A heat shield for the intake should be following this product for those of you that would like that sort of thing. Link to comment Share on other sites More sharing options...
jim1969 Posted October 31, 2005 Share Posted October 31, 2005 SPT shorty intake? Link to comment Share on other sites More sharing options...
RidinLow Posted October 31, 2005 Share Posted October 31, 2005 Yep! Link to comment Share on other sites More sharing options...
jim1969 Posted October 31, 2005 Share Posted October 31, 2005 Eta? Link to comment Share on other sites More sharing options...
j255c Posted October 31, 2005 Share Posted October 31, 2005 where did you get this information about a spt shorty intake? 06 TB EVO IX SE stock turbo monster subaru hater Link to comment Share on other sites More sharing options...
froggert Posted October 31, 2005 Share Posted October 31, 2005 i'm not certain if ridinlow wants to say how he knows, but trust me, he's got the poop (and a prototype). Link to comment Share on other sites More sharing options...
jim1969 Posted November 1, 2005 Share Posted November 1, 2005 how can you get to the spt website? Link to comment Share on other sites More sharing options...
RidinLow Posted November 1, 2005 Share Posted November 1, 2005 ETA on the intake is after March. Our website doesn't have it on there yet, but you can get there through one of the links on the bottom of the subaru.com site. I'll post some pics after SEMA. Link to comment Share on other sites More sharing options...
KTM 525 Posted November 1, 2005 Share Posted November 1, 2005 Does the MAF housing on this SPT unit have the splitter veins in it like the one in the OEM airbox? Link to comment Share on other sites More sharing options...
RidinLow Posted November 1, 2005 Share Posted November 1, 2005 In the stock airbox, incoming air has to go around a corner from the filter to the MAF. The splitter is there to straighten it out, especially because the MAF is located very close to the apex of that corner. In the SPT intake, the filter is pretty much in line with the MAF, making the screen unnecessary because the flow stays laminar. To be sure of this, I've monitored the MAF voltage under all sorts of conditions and it never shows any signs of turbulent airflow. The graph is always nice and smooth. It also flows a bit more air even without modifying anything else in the car. Link to comment Share on other sites More sharing options...
KTM 525 Posted November 1, 2005 Share Posted November 1, 2005 Reason I ask this question is the Perrin and other short intakes seem to lean the map out a bit. Datalogs by members here show higher EGT,leaner AF, and the fact the MAF simply reads less air volume (mass in grams is the parameter on the datalog I think). With the MAF reading (thinking) it's seeing less air (in reality it is not) it will add fuel for that amount of air wich is less. The MAF housing on the Perrin is the same size as stock. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.