Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - FR-S Seems Slower Than Normal?

jmusser96 · 02-14-2016, 11:21 AM

Hey guys! This will be my first post to the forum, and I'm hoping some of you will be able to help me out with some potential problems my FR-S may be having. I bought Skylar about 6 months ago and she currently has 33k miles on her and an MXP Comp RS exhaust system. Automatic transmission as well (I know, here's my man card). I guess I didn't do quite enough research before I bought the car, because for about 4 of those months, I was filling the tank with regular 87 octane. I never heard that it took 93, nor did the dealership mention it to me. I noticed the car getting slower and things started to just not feel right, and that's when I started researching and found out I needed to use 93. I've been on 93 now for about 2 month and things feel better, but the car still doesn't feel as quick on its feet as it did the day I brought it home. When doing hard accelerations, the revs don't climb smoothly, but rather intermittently, as if the engine is struggling to get up to red line. Also, when I shift manually down into first when I'm slowing down, the gear change is delayed and sometimes the car will jerk and there will be a clunk from the transmission. Sometimes this same thing will happen shifting down to 4th at about 55mph, but usually its just going down to first. Last thing is that there is a whine coming from what sounds like the engine bay or transmission that is most prominent in 3rd gear at 3500rpm. This started happening shortly after I switched back to 93 octane. So I guess my questions are which of these things are normal for the automatic FR-S and which are cause for concern? Also, what damage could I have done by running 87 for those 4 months and should I try unplugging the battery for a night so the ECU can reset and re-learn itself? It's been pretty cold here for the last month but I'm not sure if that would have a significant effect on the car. I did a lot of research on all these things but could not find much useful information, so I'm sorry if some of these topics have been discussed on other forums that I didn't find. Thank in advance, everyone!

02-14-2016, 11:21 AM	#1
jmusser96 Junior Member Join Date: Nov 2015 Drives: 2013 Scion FR-S (Asphalt) Location: Maryland Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	FR-S Seems Slower Than Normal? Hey guys! This will be my first post to the forum, and I'm hoping some of you will be able to help me out with some potential problems my FR-S may be having. I bought Skylar about 6 months ago and she currently has 33k miles on her and an MXP Comp RS exhaust system. Automatic transmission as well (I know, here's my man card). I guess I didn't do quite enough research before I bought the car, because for about 4 of those months, I was filling the tank with regular 87 octane. I never heard that it took 93, nor did the dealership mention it to me. I noticed the car getting slower and things started to just not feel right, and that's when I started researching and found out I needed to use 93. I've been on 93 now for about 2 month and things feel better, but the car still doesn't feel as quick on its feet as it did the day I brought it home. When doing hard accelerations, the revs don't climb smoothly, but rather intermittently, as if the engine is struggling to get up to red line. Also, when I shift manually down into first when I'm slowing down, the gear change is delayed and sometimes the car will jerk and there will be a clunk from the transmission. Sometimes this same thing will happen shifting down to 4th at about 55mph, but usually its just going down to first. Last thing is that there is a whine coming from what sounds like the engine bay or transmission that is most prominent in 3rd gear at 3500rpm. This started happening shortly after I switched back to 93 octane. So I guess my questions are which of these things are normal for the automatic FR-S and which are cause for concern? Also, what damage could I have done by running 87 for those 4 months and should I try unplugging the battery for a night so the ECU can reset and re-learn itself? It's been pretty cold here for the last month but I'm not sure if that would have a significant effect on the car. I did a lot of research on all these things but could not find much useful information, so I'm sorry if some of these topics have been discussed on other forums that I didn't find. Thank in advance, everyone!