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cipher
Joined: Apr 18, 2010
Posts: 28
Location: Currie, N.C.
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 Posted: Wed Mar 16, 2011 3:18 am Post subject: |
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Magnaflo is the best muffler for a turbo but depending on the straightness of your exhaust that will help alot too. I'm running a 3" from the turbo to a magnaflo turned down before the axle and theres really only 3 bends in the piping so it's as close to straight as i can get on the single exhaust on the 4cyl. Just thinking this may be an angle but it sounds like you have covered this already. lol.
Mike J. |
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SpeedJunky
Laying Rubber
Joined: Jan 17, 2009
Posts: 1380
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| Posted: Wed Mar 16, 2011 4:00 am Post subject: |
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| ScreamingFast wrote: | | Well I can tell you that when we first had the turbo installed it had SLP loud mouths (basically straight pipe) but it was just god awful loud. So changed it out to bullet style muffler (magnaflow) and it seem like that it ended up with more lag. When the SLP where on the car it felt like boost was more instant. But I really doubt that little bit of a change would affect lag at all. |
Any changes to the exhaust will change the properties of the turbo. If it's spooling slower I would say you have increased the pressure after the turbine which is bad. I would take the muffler out completely and take it around the block to see if that helps. Just to see, then you can go from there. |
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cipher
Joined: Apr 18, 2010
Posts: 28
Location: Currie, N.C.
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| Posted: Thu Mar 17, 2011 2:24 pm Post subject: |
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http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech102.html#b
Heres a link i came across while i was researching a new turbo for my wifes car. It made it easier to choose what i wanted and explained how the a/r affects turbo lag. I just bought a t3/t4 hybrid 50trim with .63 a/r. Can't wait to see what i can get out of it.
Mike J.
Last edited by cipher on Thu Mar 17, 2011 3:01 pm; edited 1 time in total |
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ScreamingFast
Site Admin
Joined: Aug 17, 2008
Posts: 11380
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| Posted: Thu Mar 17, 2011 2:53 pm Post subject: |
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| cipher wrote: | Magnaflo is the best muffler for a turbo but depending on the straightness of your exhaust that will help alot too. I'm running a 3" from the turbo to a magnaflo turned down before the axle and theres really only 3 bends in the piping so it's as close to straight as i can get on the single exhaust on the 4cyl. Just thinking this may be an angle but it sounds like you have covered this already. lol.
Mike J. |
Well with the SLP it was just the mufflers, the stock piping that went over the axle actually has a area that was tappered alittle (looks like it would cut flow). With the Magnaflows the piping is the same diameter all the way even over the axle and the bends are not to extreme.
When Wayne tunned it he even said it had very little lag at all (slp at the time). So anyways a week or two later me and Jeff installed the Magnflows and I was really excited to have him drive it just for him to see how it built boost quickly......went for a spin with him driving and he wasn't impressed and said it had typical lag and me being in the passenger seat even noticed it.....I told him that it wasn't like that before? But I was told that this style muffler was the best for a turbo application and stay away from chamber mufflers. If the SLP wasn't so freaking insane sounding I would have stayed with them!
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Last edited by ScreamingFast on Thu Mar 17, 2011 3:02 pm; edited 2 times in total |
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stang910
Smokin' Tires
Joined: Nov 02, 2008
Posts: 3066
Location: Jacksonville
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| Posted: Thu Mar 17, 2011 2:56 pm Post subject: |
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| BORLA's............ just saying lol. |
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ScreamingFast
Site Admin
Joined: Aug 17, 2008
Posts: 11380
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| Posted: Thu Mar 17, 2011 3:03 pm Post subject: |
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| SpeedJunky wrote: | | ScreamingFast wrote: | | Well I can tell you that when we first had the turbo installed it had SLP loud mouths (basically straight pipe) but it was just god awful loud. So changed it out to bullet style muffler (magnaflow) and it seem like that it ended up with more lag. When the SLP where on the car it felt like boost was more instant. But I really doubt that little bit of a change would affect lag at all. |
Any changes to the exhaust will change the properties of the turbo. If it's spooling slower I would say you have increased the pressure after the turbine which is bad. I would take the muffler out completely and take it around the block to see if that helps. Just to see, then you can go from there. |
hmmmm just might have to do that
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SpeedJunky
Laying Rubber
Joined: Jan 17, 2009
Posts: 1380
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| Posted: Thu Mar 17, 2011 5:02 pm Post subject: |
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| stang910 wrote: | | BORLA's............ just saying lol. |
LM1s!!  luv the way they sound with the hair dryers, can't wait to hear them at WOT! |
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uedlose
Joined: Oct 14, 2011
Posts: 1
Location: Middle Way/Charles Town WV
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| Posted: Fri Oct 14, 2011 10:00 pm Post subject: |
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in your first post you are on it. by running lower gears it makes the engine not have to work as hard = slower spool. Now with a tall gear like the 3.31 means more load =faster spool and you are in that gear longer so you are in boost longer with out having to lift and fall out of boost. So you should run faster not make any more power but your torque curve should also be broader do to staying in boost longer and coming in sooner.
By changing the a/r on the turbine to a smaller housing yes it it may come on sooner but it is gone to fall off on the big end and may very well start to cause back pressure issues.
There are lots of thing that can cause lag poor flowing intercooler, poor flowing exhaust, poor turbo kit design, cheap turbo, wrong camshaft. major back pressure issues. You said that you start seeing boost by 2500 and are at full boost soon after hate to tell you but that is pretty darn good.
I dont think you are feeling lag I think you are feeling Boost threshold look up the difference. really if you want it to come on any sooner back the gear down and that still may not help but it will let you stay in boost longer another way to try it with out swapping gears would to be find a taller tire to put on it. The best cure you probably dont want to hear put a auto with a good converter in it if it is a stick. Really though put the 3.31 or even 3.27 in it you will love the difference. but dont forget the lower the gear the more strain it is putting on the clutch |
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SuperDan
Site Admin
Joined: Sep 15, 2009
Posts: 4560
Location: Canetuck, N.C.
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| Posted: Fri Oct 14, 2011 10:45 pm Post subject: |
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Please make an introduce yourself thread.
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ScreamingFast
Site Admin
Joined: Aug 17, 2008
Posts: 11380
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| Posted: Sat Oct 15, 2011 5:38 am Post subject: |
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Yeah intro would be nice. But anyways we solved the lag issue. Did some data logging and the car was on 14 degrees timing so added a couple of degrees and it mad a big difference in lag. Car is so much better now!!!!
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