i’ve been doing searching around but still havent found a straight answer on how high i should turn my boost to, i recently jsut got a turbosmart single stage MBC (install help would be nice for that to thanks) and im not sure on how high i can put the boost up to SAFELY when i put it on cause i wanna do it soon. So here is a list of my engine mods done to my car to maybe help you tell me how high i can put it up to. its an 89 240sx with redtop sr20det.
Megan racing turbo manifold
twin chamber o2 housing
fmic with 2.5 piping(mounted behind bumper support, almost the size of the rad, bar and plate 3" thick)
HKS SS BOV
ported and polished head
cometic 1.3mm head gskt
multi layer steel intake and exhaust gskts
rocker arm stoppers
walbro 255 fuel pump
3 inch turbo back exhaust
GT28RS ball bearing turbo
mushroom style air filter
ngk iridium spark plugs
OPTIMA battery
s14 sr20det copper radiator and hoses
electric cooling fan
stage 3 6 puck clutch
95 180sx VLSD with 5 bolt axles
so hopefully this helps cause im not really sure what psi to go up to safely. thanks.
I wont claim to know anything about the SR20 because I don’t. however, I do know things about fuelling systems and I do know a GT28r is considerbly bigger than a stock t28… that being said I wouldn’t just “put it wherever you want” I’d ask someone who knows about turbo maps that can compare what the stock fuel system can handle t28 wise then do the math to figure out what the gt28 will flow safely. your car is tuned to run a t28, you could probably get away with 14 lbs no problem on that but a larger turbo is a whole other story.
ask someone with a similar setup if theyd know, or take it to a dyno and do some pulls with a wideband and or egt and increase the boost after every pull until it becomes too lean or the egts get too high if you’re just using the stock fuel maps and no other tuning such as afc or standalone.
Something that will datalog (like a zeitronix). As far as Im aware only way you can get any datalogging outta the AEM unit is if you also have the AEM EMS and thats huge money.
Nah, you just need to watch the gauge while driving, or have someone keep an eye on it for you while you’re boosting - to make sure the AFR’s are safe, that’s all. You need the AEM EMS to remember/store or “datalog” the information for looking at later if that’s what you’re looking for.
I would highly recommend the Uego, but then again i’ve never owned another wideband so…
One other thing, i’d follow Lucky’s advice and stay below 10 PSI for now. Get it all set up correctly and then boost her guilt-free!