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Ok thanks man, problem solved. I cut off the restrictor off the j-tube and was able lower the pressure below 50psi. I set it at 39psi. What do you guys usually set the fuel pressure to for a good tune?

This J-tube is the little tube that is connect to the block under the intake manifold right? Shapes like a J or U for the return line.

I set it with the vac off. I got the sx brand, not the cheap xs brand off ebay. SX brand is a really good brand like aeromotive.

How much they paid him to haul that little thing?????

I bought my sx regulator about a year ago but the car sat 90 percent of the time in the garage when i installed it. Im gonna put my buddy aeromotive regulator on and see what happens. I can still raise the pressure with the sx regulator though.

But is this normal with the 12volt mod? On my buddy mk3 supra with just the 255fp without the 12volt mod can be turn lower than mines.

Ok I have a sx fuel pressure regulator, 255high pressure fuel pump with the 12volt mod done on my mk3. When i try to lower my fuel pressure with the sx regulator, the lowest it goes down is 50psi, thats with the whole screw out of the regulator. Is this normal with the 12volt mod????

Oh i will

Im starting at 15psi and work my way up to 20psi. Right now is doing 15psi on street tune and it runs pretty strong.

Update....planning to hit the dyno mybe in 2 or 3 weeks. Little delay on the project cause ive been over the road in the transportation business. Will update soon on the numbers. Planning to run 20psi on pump and 22-23psi on race if it dont blow up.

I know this supra. Its used to have JE pistons on 7mgte shot peen rods. made low 400whp on a 60-1 at 16psi.

I believed they are 12.7 inch rotors for the vr4. the non turbo 3000gt brakes are upgrades for fwd dsm bolt on.

3000gt vr4 has some pretty good 4piston calipers, just curious if any mk3 owners have made a DIY kit to fit it on a mk3.

problem solved. Turns out that i fried the 550cc chip. Now is running good with a new chip, thanks for all your support.

Ok today i got my gm 3 bar map sensor installed it and still doing the same thing. Afc not reading hz, i did put the stock afm back on and it ran fine. Correct me if im wrong on the wiring gm 3bar map sensor= A=ground B=signal C=5volt hks vpc= green=ground blue=signal yellow=5volt

Im in the warren area, red 90 supra t67. Also my cuz with the white 90 1jz gt4067r turbo.

Ok i did a compression test and its 165 psi all across. i checked all my connected from afc to vpc and it still good, now im leading to a bad map sensor. where can i get one, hks discontinued it. Throwing code 31 and 24

Well, I already solved the other problem, two vac line pop off. I already put them back. ---------- Post added at 08:15 PM ---------- Previous post was at 08:05 PM ---------- Before this happen, it was tune set at 15psi and it ran find and 3rd gear pull went thru to 6000rpm. I tried to set...

I was testing my mbc to set my boost at 20 psi but i screw too much and it went 26psi, fuel cut kicked in and after that the car keep stalling. It wont hold idle, throw code 31 and the hz is not reading on the afc. This was just second gear pull to set boost level. any help. bad map sensor...

And i also installed a hks vpc i got from a friend.