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need boost/vaccume line help fast
6 Attachment(s)
Could someone check this out real quick to make sure I wired all the lines correctly? Got a track day on sunday, and am getting it tuned tomorrow night, so just making sure everything is right before that.
The red line connects straight to the boost gauge, the yellow one goes to the BOV nipple. https://www.miataturbo.net/attachmen...ine=1319861081 Yellow line goes to the MAP https://www.miataturbo.net/attachmen...ine=1319861081 red is going to the turbo, yellow to the wastegate, and the blue is the controller/regulator. https://www.miataturbo.net/attachmen...ine=1319861081 Thanks guys |
Yes it looks fine. Boost/vac is boost vac. nothing special about it unless you have one way valves or some shit
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Originally Posted by Faeflora
(Post 789370)
Yes it looks fine. Boost/vac is boost vac. nothing special about it unless you have one way valves or some shit
For some reason my boost gauge isn't working. It never goes past 0PSI, it moves in the mmHg area below 0 tho. I cant seem to figure out why, all the boost gauge wiring seem to be correct. Any ideas? Gauge is a STRI X-Line 52mm. |
I'd recommend that you source the pressure line for your wastegate from somewhere after the IC and before the throttle. You will have pressure drop through the IC as flow increases. This will result in boost sag, even though you have a nice MBC. Joe Perez had a nice, easy to understand write-up on this.
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Originally Posted by hornetball
(Post 789396)
I'd recommend that you source the pressure line for your wastegate from somewhere after the IC and before the throttle. You will have pressure drop through the IC as flow increases. This will result in boost sag, even though you have a nice MBC. Joe Perez had a nice, easy to understand write-up on this.
https://www.miataturbo.net/attachmen...ine=1319861081 I'm gonna look that up, thanks. |
Yes, that's the one.
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Originally Posted by hornetball
(Post 789396)
I'd recommend that you source the pressure line for your wastegate from somewhere after the IC and before the throttle. You will have pressure drop through the IC as flow increases. This will result in boost sag, even though you have a nice MBC. Joe Perez had a nice, easy to understand write-up on this.
you should not source boost from the compressor housing. you will get sag. red goes from housing to mbc? |
Originally Posted by Clos561
(Post 789822)
i sourced all mine from the manifold after the tb.
you should not source boost from the compressor housing. you will get sag. red goes from housing to mbc? During cruise your turbo will be pushing 100% as the waste gate will be closed. It kinda defeats the throttle body as every time you're not at full boost the wastegate will be closed trying to get to the set boost however you're limiting the pressure going to the engine with the throttle body so you get a big mind fuck. You press the gas, more exhaust goes to the turbo to spool it, turbo spools more but wastegate stays closed. You press the gas some more now you're in boost however still at low throttle so the turbo spools more as the wastegate still stays closed. You step to wot, the turbo has already spooled and built up a lot more than your set psi so you get a spike in psi so your wastegate now opens and you're fine. Now you're turning keeping the gas even, the throttle is say 30% open at 6psi however your wastegate is now closed so your turbo is trying to get to the set psi so it spools more so you close the throttle to make up for it, then when you step on the gas after the turn and you get another spike again throwing your rear end into the wall where you crash and burn and die. Is that what you want? This is why you cant have nice things!!1! |
ive never had spikes or any erratic boost behavior
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Finally works guys, the line does not work for boost. i ended up teeing the line for the MAP and it works now!
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1 Attachment(s)
Originally Posted by triple88a
(Post 789832)
Sourcing bov boost from the compressor housing is at least better than manifold however sourcing boost between the IC and the TB is the best.
During cruise your turbo will be pushing 100% as the waste gate will be closed. It kinda defeats the throttle body as every time you're not at full boost the wastegate will be closed trying to get to the set boost however you're limiting the pressure going to the engine with the throttle body so you get a big mind fuck. You press the gas, more exhaust goes to the turbo to spool it, turbo spools more but wastegate stays closed. You press the gas some more now you're in boost however still at low throttle so the turbo spools more as the wastegate still stays closed. You step to wot, the turbo has already spooled and built up a lot more than your set psi so you get a spike in psi so your wastegate now opens and you're fine. Now you're turning keeping the gas even, the throttle is say 30% open at 6psi however your wastegate is now closed so your turbo is trying to get to the set psi so it spools more so you close the throttle to make up for it, then when you step on the gas after the turn and you get another spike again throwing your rear end into the wall where you crash and burn and die. Is that what you want? This is why you cant have nice things!!1! Attachment 240355 |
This is why we can't have nice things!
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