boost

Just bought an 87 USDM Turbo and it is stumbling at 5PSI. It has a rebuilt head, HKS stopper HG and ARP studs as well as a Walbro 255. Everything else is stock. Car stumbles when you get to 5PSI and slightly bucks. Any suggestions would be greatly appreciated. Thank you in advance. Just...

Hi guys trying to keep this as brief and as informative as possible. The issue: Boost drop at high rpms. ~16psi down to ~11psi ...also worth mentioning it only makes 11psi max in 1st gear and 13 (also drops to 11) in 2nd. 3rd is where it will hit 16psi and then drop at around 5000+rpm...

When I upped the boost on my 88 turbo I started hearing a solid ding very very similar to the "key in ignition, door open" alarm. It comes on when the boost gauge reads about 7 or higher and stops when I let out. Only does it when I pass 7 lbs of boost. Do the mk3's have a warning alarm?

I just got my GTE running and it idles smooth (too high but smooth), and runs smooth. However, when ever I get into boost it starts leaning out bad. It pulls strong but then it start to gets weak when the turbo start spooling. I haven't been able to figure it out. Mods: Intercooler kit 3...

Ok, so we've now finished the head rebuild on Suggestable's GTE. During the shakedown runs it's pretty obviously running more boost than a stock supra. (Another boost gauge capable of reading up to 1.5bar is on the way, but currently boost goes off the top of the stock gauge) I'm suspecting...

Alright everyone it's been awhile since I've posted on here but I got my build complete'd and have finished breaking in the motor. Now I'm starting to work on tuning it, but as soon as I go into even low boost (2-4psi) the fuel pressure drops all the way down to 15-20psi. I've tried adjusting...

So i have an 88 7mgte built motor and tranny its been running good at 15lbs of boost, i want to turn it up to 25lbs, so the question is should i use 110 octane gas to prevent detonation? is anyone running at 25lbs? if yes what kinda gas you using?

Hello, I have a 7mgte 1987 Toyota supra (stock engine internal components) pushing 12 psi with stock everything. This is my daily driver, and the only information I have on the car is a pile of reciepts, basically stating the goods which are a performance shortblock, and overhauled CT-26 (stock...

Hey everyone! Well im new to the supra scene and forums my names Geo.! had a couple of s13s before but just recently picked up an 87' mk3 turbo and have a newb question id like to ask before the fun begins :) How much can i boost this baby to safely? car has slight modifications: Metal head...

hey guys, im interested to see what turbos everyone is using, also need some suggestions on what turbo i should use other than the CT26, i will be running with a rebuilt block and head with all ARP hardware and King barrings along with some other light mods, im looking for somewhere arround...