top mount - bottom mount - Nissan 240SX Forums
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#1 Old 07-22-2006, 06:12 PM
 
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top mount - bottom mount

Well I did a search on this subject and i ended up with some group buys so here it goes.

I am trying to decide between a top mount and a bottom mount setup. The turbo in question is 287r1. ( I know bandwagon etc... just bear with me a little). When i was doin a search on other forums i read that top mount turbo setups are not good because they create extra heat for the head and brake cylinder. They also require more complex piping. So basically its more work and more money. However they do look really nice in your engine bay. Bottom mount turbo's are better as far as location, there is less modification needed and its cheaper. Now the question is is this it? I mean is there any performance or reliability difference between the two? I remeber somebody talking about the bottom mount ones spooling fast or having less lag, it may be bullshit i am not sure. Also the t3 or t4 or t3/t4 configuration, is that what determines for the turbo's mounting location or is it something else?
Tnx for the non flaming reply's.
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#2 Old 07-22-2006, 06:24 PM
 
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We have made ~400whp with stock SR manifold and GT2871R. Why spend the extra money? It does make for a better appearance, and a tuned or even just equal length manifold will make for a better spool and more top end HP. Its really up to you... what is your budget????? That is the deciding factor.

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#3 Old 07-22-2006, 06:47 PM
 
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Well there is not a real budget, there is only time.. what i mean by that is if its more expensive and i really want it, i ll get that first and that will push my wheels or suspension back 6 months or so back. So basically as expensive as it gets that much it sits in a garage or drive way.
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#4 Old 07-22-2006, 06:48 PM
 
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I just read the whole turbochargers 101-102 and 103 at garrets website, it does talk about manifolds but no specific top, bottom stuff ,they talk about cast vs tubular.
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#5 Old 07-23-2006, 12:04 PM
 
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im taking my 2871R from bottom to top mount because there alot easier maintenance just a little costly to get done. Top mount has the alot better turbo selection too cause of the T3 flange. The power difference lies between the cast vs tubular manifold and not how there mounted.
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#6 Old 07-23-2006, 12:07 PM
 
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with larger turbos, its better to go external wastegate which top mount works perfect with that. i already had problems with the stock actuator on the 2871R not boosting all that great. i had to joy rig my HKS T25 Actuator for solid boost to be held.
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#7 Old 07-23-2006, 01:08 PM
 
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Ok so top mount with the tubular manifold is they way to go. Now about the flanges, the t3 or 4 or whatever is that what determines how its mounted?
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#8 Old 07-23-2006, 06:51 PM
 
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there is nothing wrong with goin bottom mount i tried pricing stuff out and i am on a budget and its possible to make 400 whp on a bottom mount setup cause if you have ever rode in a 400 whp + 240sx its death ....... but essentially the top mount ='s bigger turbos and wastegate combos but with that comes lag i wanted a gt30 up intill i saw one hit full spool at roughly 4100 rpm for top end its great but for a daily driver its pretty much never gonna have time to spool mine is a daily so a 2871 if not a 2876 is the ideal setup ... if you want power go up top if you want a good power range with less head ache and less money keep it down south . .... also forgot to mention you have to do a custom hot pipe to fit the turbo and heat wrap ... then again this is my 2 cents
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#9 Old 07-23-2006, 08:04 PM
 
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I went with a top mount since my buddy was making the manifold for me and it was alot easier to do that way. There's no reason that one would spool faster than the other. I did a couple bottom mounts on other cars and making the intake come up and snake around the hot pipe and still fit the z32 MAF and filter on was a bitch. With a top mount it was alot simpler. I just paid for materials which i think came to around 2-300
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#10 Old 07-23-2006, 11:55 PM
 
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4100rpm for full boost and the lag wouldnt even be that noticable for a turbo that can make 430whp around 19psi. GT30R would hit alot harder than a 2871R.
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