I recently purchased a 91 MR2 from a younger gentlemen that was not super mechanically inclined. The car wouldnt start when the key was turned and ran poorly when push started. I was able to get it started by cleaning up some corrosion build up on the battery terminals. The car smoked kind of bad and wouldnt stay running without feathering the gas. I looked over the engine bay and noticed that the mass air flow sensor was unplugged. Plugged it in and car idles great.
Took the car for a drive and the turbo gave the car a great hard pull. For the next couple of days the car drove like a champ. I went to put a radar detector in and nothing lit up. I decided to check to see if the cig lighter was unplugged. This might have been a mistake. I found a bunch of bare wire behind the lighter in a ball and barely attached to the lighter. Basically there was a bunch of wiring that was put in for the boost gauge and a couple of other wires that go in to the dash with unknown path. In order to see everything I took apart the center console. Doing so I accidently unplugged the boost controller and somehow blew the fuse to the stereo and controller. I tried to drive the car and had no boost power while i was hearing the turbo spool and blow off as it should. This is when I went back through and noticed the boost controller unplugged and plugged it back in.
I go for another drive and only have partial boost. It feels like it wants to pull hard it just won't. At this point I am generating 4-6 psi boost. I start going over the piping and end up replacing a few couplers and hose clamps. Get under the car and changed exhaust flange gaskets and bolts. Notice the alternator is zip tied in place. Correct that issue to correct 100 amp alternator.
Now I take off in the car and I hear the turbo spool correctly but dont feel the power until I start getting up to 4000 rpm. Is this normal?
Also, the psi the turbo is generating is greater during the first 8 to 10 minutes of driving. I am hitting around 10.5 psi during this time. As the car runs and gets fully up to operating temp I can no longer reach that same turbo pressure. If I come to a stop then get into it I can only get up to roughly 6 psi of boost. Dont understand this and am hoping someone can give me an idea of what is going on? I also noticed last night that I was reaching 4500 rpm I was at 5.8 psi and as I reached 5500 rpm the psi was dropping. I dont think its supposed to drop like that but this is my first turbo anything and am learning as I am going on this.
Took the car for a drive and the turbo gave the car a great hard pull. For the next couple of days the car drove like a champ. I went to put a radar detector in and nothing lit up. I decided to check to see if the cig lighter was unplugged. This might have been a mistake. I found a bunch of bare wire behind the lighter in a ball and barely attached to the lighter. Basically there was a bunch of wiring that was put in for the boost gauge and a couple of other wires that go in to the dash with unknown path. In order to see everything I took apart the center console. Doing so I accidently unplugged the boost controller and somehow blew the fuse to the stereo and controller. I tried to drive the car and had no boost power while i was hearing the turbo spool and blow off as it should. This is when I went back through and noticed the boost controller unplugged and plugged it back in.
I go for another drive and only have partial boost. It feels like it wants to pull hard it just won't. At this point I am generating 4-6 psi boost. I start going over the piping and end up replacing a few couplers and hose clamps. Get under the car and changed exhaust flange gaskets and bolts. Notice the alternator is zip tied in place. Correct that issue to correct 100 amp alternator.
Now I take off in the car and I hear the turbo spool correctly but dont feel the power until I start getting up to 4000 rpm. Is this normal?
Also, the psi the turbo is generating is greater during the first 8 to 10 minutes of driving. I am hitting around 10.5 psi during this time. As the car runs and gets fully up to operating temp I can no longer reach that same turbo pressure. If I come to a stop then get into it I can only get up to roughly 6 psi of boost. Dont understand this and am hoping someone can give me an idea of what is going on? I also noticed last night that I was reaching 4500 rpm I was at 5.8 psi and as I reached 5500 rpm the psi was dropping. I dont think its supposed to drop like that but this is my first turbo anything and am learning as I am going on this.