DraggingDatsun Posted December 20, 2011 Share Posted December 20, 2011 Im picking out my intercooler for my L28ET, and everyone I see runs a long pipe across the engine bay from the turbo to the far side of the intercooler. Why does no one use a same side exit/entrance front mount? http://s1.promotionsupplies.com/ebay/just-intercoolers4/images/intercoolers/au-ic0005_23x11x3_v3.jpg Iv always noticed and been told with less intercooler piping that your turbo would spool faster.. You could cut out that whole 2.5ft pipe. Am I missing something to this? Quote Link to comment Share on other sites More sharing options...
aplyedmind Posted December 20, 2011 Share Posted December 20, 2011 I think most people just like the way it looks coming from both sides. Quote Link to comment Share on other sites More sharing options...
DraggingDatsun Posted December 20, 2011 Author Share Posted December 20, 2011 thats what I was thinking Quote Link to comment Share on other sites More sharing options...
Tony D Posted December 20, 2011 Share Posted December 20, 2011 Spool on piping volume after boost threshold is reached in times reaching 0.0x of seconds. For all intents and purposes it's not worth considering. It's a holdover from 60's systems and improper driving technique... Quote Link to comment Share on other sites More sharing options...
zx_drift Posted December 20, 2011 Share Posted December 20, 2011 Longer piping will cause a pressure drop for example your turbo will be boosting 7psi, but when it reaches the intake manifold, it's only 5psi. You also have a potential for temperature increases as the longer the air is in the pipes, the longer it has to warm up. Quote Link to comment Share on other sites More sharing options...
DraggingDatsun Posted December 21, 2011 Author Share Posted December 21, 2011 ^agreed Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted December 21, 2011 Share Posted December 21, 2011 Longer piping will cause a pressure drop for example your turbo will be boosting 7psi, but when it reaches the intake manifold, it's only 5psi. You also have a potential for temperature increases as the longer the air is in the pipes, the longer it has to warm up. No way are you going to measure a pressure drop across 2 more feet of 2.5" tubing. No way. Quote Link to comment Share on other sites More sharing options...
DraggingDatsun Posted December 21, 2011 Author Share Posted December 21, 2011 2 ft is a rough guess Quote Link to comment Share on other sites More sharing options...
Leon Posted December 21, 2011 Share Posted December 21, 2011 (edited) Wait, do you guys really think there will be a 2 psi pressure drop in 2 or 3 feet of 2.5 inch piping? Edited December 21, 2011 by Leon Quote Link to comment Share on other sites More sharing options...
letitsnow Posted December 21, 2011 Share Posted December 21, 2011 (edited) Longer piping will cause a pressure drop for example your turbo will be boosting 7psi, but when it reaches the intake manifold, it's only 5psi. Care to figure out the head loss for us over that 2.5 feet of pipe? I'll give you a hint, not much and no where near 2psi. The intercooler will be a far bigger restriction than the pipe. I did figure it out, you'll need to be moving 50lb/min of air through a 2.25" pipe to get a .85 psi drop over 2.5 feet of pipe, 1.4psi for 6 feet of pipe. That's ~500rwhp worth of air. At 300rwhp worth of air (~30lb/min) that same 2.5 feet of pipe(2.25" pipe) will cost you a whopping .3psi. I've included a couple bends in that 2.5 feet of pipe as well, just for good measure. You also have a potential for temperature increases as the longer the air is in the pipes, the longer it has to warm up. Ok, now this is just silly. Have you measured the temp coming out of a turbo that's working fairly hard? I have, think 220*F+(at 9psi on a t3), in a 150* engine bay it can only LOSE heat. Now if you're talking about the cold side of the intercooler, that pipe should only be 12"-14" long, any longer is poor routing. Edit: I think I've been beaten to the punch, but I've got maths. Edited December 21, 2011 by letitsnow Quote Link to comment Share on other sites More sharing options...
DraggingDatsun Posted December 21, 2011 Author Share Posted December 21, 2011 so no difference? pick whatever i like? Quote Link to comment Share on other sites More sharing options...
letitsnow Posted December 21, 2011 Share Posted December 21, 2011 Under 500rwhp, sure. Quote Link to comment Share on other sites More sharing options...
BLOZ UP Posted December 21, 2011 Share Posted December 21, 2011 Ease of routing would be first priority. Trying to squeeze every last fraction of a percentage point of efficiency would be a waste, when you can spend that time and money elsewhere more effectively. Quote Link to comment Share on other sites More sharing options...
slownrusty Posted December 21, 2011 Share Posted December 21, 2011 Longer piping will cause a pressure drop for example your turbo will be boosting 7psi, but when it reaches the intake manifold, it's only 5psi. You also have a potential for temperature increases as the longer the air is in the pipes, the longer it has to warm up. Absolute pish-posh. I hydraulicly modelled my intercooler which is a cross flow design and the pressure drop was minimal somewhere less than 0.1psi...please don't comment if you do not have a clue. Quote Link to comment Share on other sites More sharing options...
Tony D Posted December 21, 2011 Share Posted December 21, 2011 It's Christmas Break.... Semi-Annual Paradigm Reinforcement Time We'll see it again in the Spring. The biggest pressure drop in the whole setup is at the THROTTLE PLATES. Most people mistakenly think that they are boosting 7PSI at the turbo and getting 5PSI in the plenum but NEVER drill and tap the hole before the throttle plate to see that it's 7PSI there as well. You loose more pressure across the opened throttle plate than any piping that is properly (see above, 2.5 or even 2" below 500WHP) sized. It's a toss between I/C and Throttle Plate at WOT for biggest restriction in the system. Below 100% WOT, hands down it's the Throttle Plate! I stand corrected if you guys are running Jenvey Barrel Throttles, but I highly doubt you are... Quote Link to comment Share on other sites More sharing options...
deaner Posted December 30, 2011 Share Posted December 30, 2011 Exactly what Tony D said. It's air moving not jello pudding. The pressure difference around the throttle plate and the air having to split and converge after the IC are the points to really care about. To the OP, because opposite port IC are cheap and everywhere lol. Quote Link to comment Share on other sites More sharing options...
kaito Posted January 5, 2012 Share Posted January 5, 2012 Im going with crossflow IC just because I dont want to cut a hole in my radiator support. Quote Link to comment Share on other sites More sharing options...
Pyro Posted January 6, 2012 Share Posted January 6, 2012 reclock the compressor and run the ic tube under the block. Quote Link to comment Share on other sites More sharing options...
Six_Shooter Posted January 15, 2012 Share Posted January 15, 2012 (edited) reclock the compressor and run the ic tube under the block. This is what I did with mine. --==EDIT==-- Old pictures before IC, but I routed the tubing as if there was an FMIC installed: After FMIC installed, I had to change how the tubes were passed through the rad support. : Just a couple pictures of the FMIC as I made it: Edited January 15, 2012 by Six_Shooter Quote Link to comment Share on other sites More sharing options...
Pyro Posted January 16, 2012 Share Posted January 16, 2012 I ran my IC pipe up between the engine mount and alternator to avoid the oil filter. Quote Link to comment Share on other sites More sharing options...
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