1 Attachment(s)
Originally Posted by LownSlow616
(Post 1358682)
Still puzzling tho. Im still thinking this is the turbo for my goals but if i struggle to hit even 300whp ill be mad asf
Virtual Dyno results of my last car: GTX2860, E85, begi cast manifold, stock '99 pistons, forged rods Attachment 183235 |
Originally Posted by pdexta
(Post 1358784)
Don't give up on the GTX lineup just because one setup doesn't post dyno numbers you're looking for. People have hit 300whp on a GT2560, no reason at all that you shouldn't expect a GTX2867 to do it. As much as these turbos seem to like high boost sixshooter would be +300whp with a few more psi, it's not like he couldn't get there if he wanted to.
Virtual Dyno results of my last car: GTX2860, E85, begi cast manifold, stock '99 pistons, forged rods http://i272.photobucket.com/albums/j...13.15.pull.png Ive been reading compressor maps a little and i think im going with the gtx2871. Wont even be breaking a sweat at 320whp and I could probably see 400whp someday if i get an allofit engine. my next goal is 340whp on a stock 99 engine with manley rods and e85 |
Originally Posted by LownSlow616
(Post 1358787)
i believe these VD results with the 11 second passes on there. what size turbine housing are you using?
It's .72 a/r. Special Turbine Housing T25 Inlet, Cast 44mm EWG Port : atpturbo.com |
Originally Posted by pdexta
(Post 1358806)
Haha, thanks.
It's .72 a/r. |
I think the oddly low peak power in the RPM range is a clue as to where to look for the problem.
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Originally Posted by miata2fast
(Post 1358821)
I think the oddly low peak power in the RPM range is a clue as to where to look for the problem.
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it is my understanding that it would shift the power curve one way or the other depending on whether advanced/retarded, and it looks like you have neither the low end grunt nor the top end power.
I'm thinking restriction |
Originally Posted by pdexta
(Post 1358784)
Don't give up on the GTX lineup just because one setup doesn't post dyno numbers you're looking for. People have hit 300whp on a GT2560, no reason at all that you shouldn't expect a GTX2867 to do it
http://www.codrus.com/dyno/synergy-O...ynergy-265.png --Ian |
Originally Posted by codrus
(Post 1359005)
I made 340 rwhp on a GTX2863, a 2867 is capable of more. Lots of boost and enough octane to run decent amounts of timing. This was with 24 psi of boost, and there's a lot more power there if I had more octane:
http://www.codrus.com/dyno/synergy-O...ynergy-265.png --Ian Its tough bc im pretty sure the 67 can do it but i feel like the 71 will be able to do it easier with less tuning and have way more headroom. Plus its only 4mm bigger..which will be like 2 or 300 rpm less spool. Not even a big deal |
Originally Posted by LownSlow616
(Post 1359007)
Ill be using e85. I want 330-maybe350whp. I know the gtx2867 can do it, I just don't want to run crazy high boost. I want to be at 330whp around 20psi.
330-350 should be quite doable on E85, though. --Ian |
Ill be on stock pistons. I don't care about the actual boost number. I just assumed more boost would add more chance for det, wear the rings more, make the turbo less efficient, etc. I think the power would be more reliable at a little less boost pressure? Or am i retarded?
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you need to read moar young grasshopper
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Originally Posted by 18psi
(Post 1358988)
it is my understanding that it would shift the power curve one way or the other depending on whether advanced/retarded, and it looks like you have neither the low end grunt nor the top end power.
I'm thinking restriction |
oh the downpipe is junk. but while the shape is terrible, it seems to still have at least 2.5" worth of girth so I dunno if it's choking at only 250
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Originally Posted by LownSlow616
(Post 1359019)
Ill be on stock pistons. I don't care about the actual boost number. I just assumed more boost would add more chance for det, wear the rings more, make the turbo less efficient, etc. I think the power would be more reliable at a little less boost pressure? Or am i retarded?
Generally speaking, torque is proportional to MAP times displacement. Engine breathing mods will move the torque peak further up or down the RPM band, but they won't really change the peak value by all that much. Since power == torque * RPM, this means that you get more power either by adding more torque (and with fixed displacement this means more boost) or with more revs. More revs means cams, head work, better-flowing manifolds, etc. The parts and knowledge for building a Miata motor to take boost are generally cheaper, more available, and easier to DIY than for revs. From what I've read (never tried it myself), stock pistons can be used for higher boost better than stock rods can, but will reduce your margin for safety in detonation. --Ian |
Originally Posted by 18psi
(Post 1359030)
oh the downpipe is junk. but while the shape is terrible, it seems to still have at least 2.5" worth of girth so I dunno if it's choking at only 250
--Ian |
Check to make sure the throttle body is opening up all the way when mashing the pedal before doing anything else.
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Originally Posted by 18psi
(Post 1359022)
you need to read moar young grasshopper
If i was at 22psi (2.5 pressure ratio) flowing the 40 lb/min, this turbo would be most efficient and have plenty of headroom https://cimg6.ibsrv.net/gimg/www.mia...a4d7959ba1.jpg |
Please start your own thread, and let us talk about how to help Sixshooter.
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Originally Posted by miata2fast
(Post 1359098)
Please start your own thread, and let us talk about how to help Sixshooter.
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