Too much compressor surge, idfk what I'm doing

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Anonymous
Too much compressor surge, idfk what I'm doing 2017-08-09 03:59:52 Post No. 17688474
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Too much compressor surge, idfk what I'm doing Anonymous 2017-08-09 03:59:52 Post No. 17688474 [Report]

So I've got a silvia s15 with an sr20det, stock turbo. Previous owner tuned it to 12psi.

I think my blow off valve might be fucked. As I hit boost, it goes up to around 14.5psi or so. After this it then drops down to around 13psi. As I let off the accelerator, I get massive compressor surge.

Is this because my blow off valve might be blocked? Or isn't handling all the boost enough? Will getting an electronic boost controller help to solve this? Or do I have to replace the BOV?

Anonymous 2017-08-09 04:04:08 Post No.17688492
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Anonymous 2017-08-09 04:04:08 Post No.17688492 [Report]

It sounds like it has a failing manual boost controller. And youre getting bad boost surge. Mess with your boost controller setting and dial it back. And the chirping you hear when you let off the accelerator is air hitting the throttle body and surging into the turbo. Which means you have too small of a blow off valve.

Anonymous 2017-08-09 04:08:07 Post No.17688501
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Anonymous 2017-08-09 04:08:07 Post No.17688501 [Report]

>>17688492
Thanks, that's what I suspected.

Anonymous 2017-08-09 04:32:59 Post No.17688587
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Anonymous 2017-08-09 04:32:59 Post No.17688587 [Report]

>>17688501
if its tuned at 12psi why are you hitting 14-15psi?
Do you have an AFR gauge? I can only imagine the terrible fucking AFR you are getting.

Anonymous 2017-08-09 05:01:35 Post No.17688705
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Anonymous 2017-08-09 05:01:35 Post No.17688705 [Report]

>>17688587
Don't have one. Do you suggest I get one?

Anonymous 2017-08-09 05:20:08 Post No.17688776
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Anonymous 2017-08-09 05:20:08 Post No.17688776 [Report]

>>17688705
its a good investment. if you keep it at the stock boost and stock tune its probably not needed.
I can't really chime in on your boost problem, though, but even an increase of a couple of psi than stock can lean out your engine enough to destroy it.you might get knock and it cand destroy an entire engine on 1 knock.
I bought an AEM off enjuku for about 160$ and it came with a wideband and a gauge for my miata.

Ive seen people up the boost on their SR's by just a couple psi and they blow the whole motor because the motor wasn't supplying enough fuel for the boost increase.

I am a lil drunk sorry for being all over the place.

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