Do You Guys Think A Stock 1990 Turbo 2 Jspec Motor Would Take 15 Psi Daily? I Have A Full Racing Beat Exhaust, A Fuel Cut Defender, And A Boost Controller. Do I Need Any Fuel Pump Upgrades? How Do I Make This Work?

 

With an upgraded turbo? You would need more fuel mods to make it work. Bigger injectors, S-AFC or some other form of fuel control, fuel pump, and so on.

 

exactly what do i need? tell me so i can buy it--jeremie

 

Definatly need some sort of AFC and fuel mods. I can get away with 13psi with a few more mods than you only because of the altitude i'm at. I wouldn't recommend running more than 11 psi with that setup.

-Andrew

 

new turbo bigger injectors fuel pump standalone FMIC ++ much more
how about considering runnign 8psi or 10psi with safc + injectors + pump

 

i ran 15psi on just a walbro 255lph pump and stock S5 TII block and turbo. although it did go pop after 3 weeks of it.... oh well. lesson learned. i've got an F-Con covering my fuel needs along with the walbro. those are the lest amount of fuel mods you need to run that much boost.

to reiterate....

- upgrade fuel pump
- get either S-AFC or F-Con to add more fuel
- maybe even some 720cc secondary injectors

 

ACT 10.5 pound flywheel, ACT street and strip clutch (heavy duty pressure plate), knights sport fuel cut defender, autometer boost guage with vaccum, greddy type r BOV, atkins thermal pellet. thats all i have right now. what kind if boost is safe to run on that setup?

 

on the stock fuel system i wouldn't go any higher then 9psi. upgrade to a walbro fuel pump and you could go to about 10psi MAX.

with an SAFC or F-Con you could run 12-13 psi but thats pushing it without larger secondary injectors.

 

I wouldnt run any thing higher than 10-11 PSI on the stock fuel system myself especially running the AFM. First off all whats the point off running more tha 10 PSI on a stock turbo ? The stock turbo isnt designed to boost 14-15 PSI consistently, your not making anymore power than if you were boosting 10 PSI. Not to mention the fact that your over spinning the turbo with excessive CFM which in the long run run gives you cooked oil Seals in you turbo. My advice to you is the following. Lower your boost to 11 PSI Max. Run 680's in your secondaries or 720's along with the proper resistor. Go ahead and upgrade your fuel pump to a Walbro or a FD pump, along with that do the fuel pump rewire to make sure your getting the proper voltage. When you install your injectors go ahead, and do yourself the favor and have all four injectors cleaned and serviced youll be glad you did, and have piece of mind knowing your injectors are squirting the proper amount of fuel. Install a FMIC along with a TID. Some nice decent spark plug wires would be nice, along with some spark plugs install 9's all the way around. Last but not least make sure your waste gate is ported to control boost. While your at it install a EGT gauge, and have your car dynoed ASAP. And if you still want to boost 15 PSI go right ahead with your EMS of choice good luck.

 

i got a t04b with a rewired walbro, 720cc secondaries, apexi bov, fcd, and a s-afc tuned. Would it be safe to run 14-15 psi? My motor has about 11k on a '90 TII

 

front mount???? If so then yes!

 

I wouldn't run any more than 12-13 psi on the stock turbo. Anything above that and it is well out of its efficiency range and will only be blowing hot air. High intake temps = bad. People say you can run with just a Walbro 255 fuel pump up to 11 psi or so, anything above that and I would get a S-AFC (and get it professionally tuned with a wideband O2) and maybe some 720cc secondary injectors. Also, I would recommend you get your injectors professionally cleaned.

 

how much are pushing ultradef

 

Ur motor is gone in 1 month if you dont get a Fuel Pump, Port ur wastegate to stock Psi, then boost it to 12psi max. If you want 15 psi, get a bigger turbo, intercooler, fuel injectors, and an ecu upgrade or Microtech type.

 

~ 12 psi in first through third gear, then it spike up to 15+ in fourth and fifth. BUT I'm running a Haltech so fuel isn't an issue, and I don't boost in 4th or 5th for long periods of time. That should help control intake temps. Getting an FMIC ASAP, then hopefully a nice big turbo sometime next summer (if not sooner).

 

very nice! Hopefully this weekend I'll pull of my turbo so I can port it and know exactly how much boost I will be running. Also think I might go with a fmic pretty soon (hopefully).

 

hey you all didnt exactly answer my question....i got a t04b hybrid turbo with a rewired walbro, 720cc secondaries, apexi bov, fcd, and a s-afc tuned. Would it be safe to run 14-15 psi? My motor has about 11k on a '90 TII with no front mount

 

someone already said that without the FMIC that you shouldn't run that much.

get a FMIC and run 20psi if you want.

 

I'm running my stock Jspec motor at 20psi with an upgraded rom, walbro 255 high pressure pump, a SARD FPR, and an hks front mount. It's only making 240hp, but 315lb ft of torque. My turbo isn't stock though. It's a t3/t4 with a .48 hotside and a 1.04 compressor side. The stock turbo's will make boost past 15psi, it's past the efficiency range, but you'll still be making boost.

With the rom upgrade, I can disconnect the OMP and the TPS and the car still runs and revs strong, no Limp mode. It even has the fuel cut removed.

OH BTW I'm doing this on STOCK 550cc injectors.

 

is this smart????

 

I call BS. what this special ECU upgrade that allows you to run 20psi on stock injectors?

 

Especially since the map sensor only reads up to 15 psi. Your ECU has no idea you're boosting past 15 psi because the sensor runs out of range. AFM is also probably maxed out.

 

who wants to take bets on how long till he pops his motor?

 

I'm going to dyno again tomorrow at torque freaks in oregon. I'll get a video of the whole thing. What happens when I make you eat your words?

Honestly, I had no trust in the ecu until I one day found taht I was creeping to 18psi and the engine didn't blow... I added the FPR and haven't looked back since...

The only thing I'm not sure about is the A/F ratios... I've got a narrowband sensor on right now and all I've done is made sure it stays rich while under boost. But I honestly can't tell you what my A/F ratios are. Maybe next month when I get $$.

 

well i actually want to see you make me eat my words, not because i'm trying to be caucky but because i want to see someone put some doubts to rest about the stock Boost Sensor and ECU. good luck man and can't wait to see the dyno sheet.