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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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04-15-2018, 06:19 PM | #1 |
Leaky Injector
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Tomei SR7960 Overboosting?
Looking for some help.
91 240sx SR20det Yellow STi 550 cc injectors Z32 maf RSenthalpy tune Powermaxx downpipe Isr blast pipes (temporary) Aem boost gauge Walbro 255lph pump 300zx fuel filter etc. Under full acceleration the boost gauge is saying 20 to 24 psi and I have the plumbing of vacuum directly into wastegate actuator on the tomei. I did not adjust the actuator myself. I can get pictures of anything requested but all I can think to do at this time is pull my exhaust side and go externally gated. Unless someone else knows something that I'm missing. Much appreciated I don't want to boost spike my sr20 into a scrap bin |
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04-15-2018, 07:14 PM | #2 |
Zilvia Addict
Join Date: Oct 2013
Location: Denver Colorado
Age: 39
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Happens with that setup. Weld the flapper and go external gate setup so you don't have to deal with boost creep anymore.
Was your target psi 20? Is there a mbc or anything else on your setup? Are you getting the signal from the hotpipe? |
04-15-2018, 08:03 PM | #3 |
Zilvia FREAK!
Join Date: Apr 2006
Location: East Coast
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People complain of boost creep on Tomei units but apparently if you radius the wastegate hole larger a few MM like DSM guys do, you can possibly minimize this problem.
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04-16-2018, 05:59 AM | #4 | |
Leaky Injector
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Quote:
Edit: Signal is coming off the FPR line. Something like this from memory and not looking at the car. (FPR to T-Splitter, T-Split runs to Manifold port near Throttle body and Boost Gauge line) I have a Hallman MBC, but its currently disconnected as I tried to sort out the overboost issues. |
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04-16-2018, 06:00 AM | #5 |
Leaky Injector
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04-16-2018, 06:41 AM | #7 |
Leaky Injector
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04-16-2018, 10:31 AM | #8 |
Zilvia Junkie
Join Date: Oct 2009
Location: Santa Rosa, CA
Age: 42
Posts: 359
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TIAL MV-S on an OEM manifold is a great option, hanzbrady here can modify your mani to accomodate your WG.
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As long as you're not a ham-fisted retard there shouldn't be a problem. |
04-16-2018, 11:54 AM | #9 |
Zilvia FREAK!
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Thanks for the shoutout! Feel free to DM me with any needs
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04-16-2018, 12:29 PM | #10 |
Zilvia Junkie
Join Date: Jul 2009
Location: Vancouver, B.C.
Posts: 333
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Went with the turbosmart 40mm ewg, that was the only thing in stock that day so I ordered it right away, would've gone with Tial to match my BOV but oh well. You'd have to pick a spring rate as well for the ewg to match your boost.
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ig : koukimonst3r |
04-16-2018, 06:14 PM | #11 |
Leaky Injector
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Thanks everyone for the help.
I'm going to grandpa the car for now, and save up some pennies to figure out what happens next. I'll follow up long term with what happens. |
04-17-2018, 08:05 AM | #13 |
Leaky Injector
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