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Crappy spool with sr20 t25?
Whats goin on guys, i recently switched from my ebay t3 manifold with the braineack 50 trim, to a custom log mani with an sr20 t25. Just got the setup finished and my spool is garbage. 5 psi by 3200 in 5th, worse in 4th. The whole reason i changed my setup around was for better spool, but my spool is horrendous. I’ve checked for boost leaks, tightened the wastegate arm(wg moves back and forth freely and doesn’t open until 10psi of compressed shop-air), and for pre turbo leaks. Everything seems fine, what gives? I also have a tial bov that after the turbo install, sounds a little different and quieter. It’s open at idle because the spring is too light, but it shouldn’t be leaking under boost, and it didn’t in the boost leak test. What the hells goin on here? |
Vac/ boost source line? |
Originally Posted by thirdgen
(Post 1504519)
Vac/ boost source line? |
1.6L?
And welded el logs dont spool all that good |
Yeah 1.6, i know they don’t spool too good. But this bad? I was running a t3 before with the ebay log and it spooled better.. |
Bump? |
What's the turbine housing a/r on the t25 and the old t3?
Some t3's spool earlier than some t25's for various reasons. Not all t3's are the same. There's a huge variation in the series. |
1 Attachment(s)
Originally Posted by spencerh22
(Post 1504529)
Yeah 1.6, i know they don’t spool too good. But this bad? I was running a t3 before with the ebay log and it spooled better.. Attachment 228433 |
Originally Posted by sixshooter
(Post 1504563)
What's the turbine housing a/r on the t25 and the old t3?
Some t3's spool earlier than some t25's for various reasons. Not all t3's are the same. There's a huge variation in the series. |
The only thing i can think of that might be causing it, is that i had to clearance my downpipe quite a bit in order to clear the shelf with my vband adapter. I had to hammer it at the elbow, could this really be a bottle neck? I ordered a slimmer adapter and am going to try and see if a pie cut downpipe gives me a little better spool. |
A .48 will make a small t3 spool pretty damn quick. Exhaust wheel and compressor wheel size and trim can make a difference in spool also but I bet most of it in this case is in the turbine housing a/r. You can look for a smaller one for the t25 if matters that much.
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Originally Posted by sixshooter
(Post 1504589)
A .48 will make a small t3 spool pretty damn quick. Exhaust wheel and compressor wheel size and trim can make a difference in spool also but I bet most of it in this case is in the turbine housing a/r. You can look for a smaller one for the t25 if matters that much.
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I have a T25 on my 1.6 and it hits my target boost around 3500
what's your exhaust setup? |
Originally Posted by WigglingWaffles
(Post 1504592)
I have a T25 on my 1.6 and it hits my target boost around 3500
what's your exhaust setup? |
11psi, but I have 3" exhaust.
is your idle valve plumbed into the intake tract? I've heard of those bypassing boost without a check valve |
I didn't see it mentioned, but could something perhaps be wrong with the turbo itself? Was the "new" turbo used?
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I should have a T25g turbo for sale here shortly, Includes an unused 360 degree dynamic seal kit.
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Originally Posted by HmoobDude
(Post 1504598)
I didn't see it mentioned, but could something perhaps be wrong with the turbo itself? Was the "new" turbo used?
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Journal bearing sr20 t25 turbos are not really spool monsters. I've had one on my 1.8L nb2 miata and was not impressed with the spool, the gt2560r I later installed spooled better. The t25 was not horrible, but not great, considering the small size. This was on a begi cast manifold and 2.5" dp to 3" exhaust.
a 1.6l with weld els log and smashed Downpipe is not helping it spool all that great... Still it should come alive around 3500rpm or so |
Originally Posted by spencerh22
(Post 1504601)
Yeah, it was, but i rebuilt it. Everything seems fine with the turbo. |
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