ryan yco

ok so i have a 99 prelude that i turbo'd and was wondering since im only on 6psi of boost to i really need to run the missing link/check valve? i only ask cause a couple people have told me that the map sensor will read up to about 9-10 psi. if im wrong sorry just kinda made me wonder. oh and im stock ecu by the way cause i have a feeling that probably matters.

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99 prelude base:t3/t4 turbo kit, obx fmu, 10.2mm wires, ngk cold range plugs, custom 3" downpipe & catback,act stage 3 clutch, act prolite 9.9lb fly, apexi-neo, front-upper & rear-upper and lower strut & tie bars, megan race springs, kyb gr2 struts, 17x7 konig monsoons, 215-45 yokohama's... comming soon 450cc injectors, holley fpr, obd1 conversion, chipped and tuned ecu.

jonbar87

your running boost on a stock ecu?

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Is THIS really the "change" everyone was hoping for? I think not...

1997 Base, H22A, 5 Spd w/Leather.
JRSC - 9psi
215whp, 189wtq with clutch slipping
Exedy Stage 1 Clutch (worthless)
Auto>Manual Tensioner Conv.
Precision 525cc High Impedance Injectors
Walbro 255 Fuel Pump
Accord Crank Pulley
K&N drop in filter
Kamikaze Header with 2.5" collector
Mandrel Bent 3" Kteller piping

ryan yco

yes i am. dont worry im not planning on running this for a long time, just till i get the money for my injectors, so i can do the whole obd1 conversion and all that jazz. but till then this is what i have so yeah any help would be nice.

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99 prelude base:t3/t4 turbo kit, obx fmu, 10.2mm wires, ngk cold range plugs, custom 3" downpipe & catback,act stage 3 clutch, act prolite 9.9lb fly, apexi-neo, front-upper & rear-upper and lower strut & tie bars, megan race springs, kyb gr2 struts, 17x7 konig monsoons, 215-45 yokohama's... comming soon 450cc injectors, holley fpr, obd1 conversion, chipped and tuned ecu.

geramy

I dont know alot about map sensors but i think that right now you are ok, as long as your FMU holds up.

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Turbo w/ a little nitrous

PreludeNSX

You are correct but you are also missing the second half of the issue. Although the stock MAP sensor can sense 9-11 psi, your ECU can only compensate fuel for about 2 PSI (based on google searches). Any pressure above that will cause your prelude to throw a CEL and your car will go into limp mode.

I just install a turbo kit on my H23 and I had to install a Missing Link. I attempted to use some fish tank check valves from Walmart, but they were too restrictive.

Good luck

2keggie

you wont need a missing link once you have your ecu. wutever you use, it will clamp the signal or just read the boost so you wont throw a code. for max efficiency / accuracy, you should replace the map sensor w/ an aftermarket one. your tuner will have alot easier time smoothing out af's with an aftermarket map.

jimnissan

I dont know about your current brand of FMU but the greddy turbo kit one will compensate for what the stock ECU cant do like adjusting fuel for boost.