As posted on the AROC Facebook...
Had a disappointing visit to the local dyno yesterday with my 2005 147 GTA. I have had my suspicions that the car was a bit down on power but it still drives well and is deafeningly loud so all still fun to annoy the neighbours. However, some 30 horses have escaped which took me by surprise. It does explain how a celica GT4 and a Mini Cooper gave it a run for its money in recent months though...
I first had the car RR'd in 2009 as a completely stock car and it made 251bhp. I subsequently has a K&N panel filter added with CF2 manifolds, equal length front pipes (which swap over the front and rear banks although this is compensated for my swapping the lambda sensors over) and a cat-back scorpion exhaust and without a remap, it made 269bhp in 2011. Just goes to show how adaptable the ECU is.
A new map was put on the car which massaged that up to 273bhp; for my £400 I felt this was disappointing. The technician changed the map further but couldn't test it on the dyno due to it being faulty so no idea what that actually did. When I was able to get the car back on the RR later in the year it only made 260bhp due to the intake being split.
In the years since, I have started running the car on Super Unleaded and crucially have changed my exhaust set up significantly. I now run wizard front pipes which are more similar in design to standard (so the exhaust banks are swapped back to standard) and the free flowing wizard rear section and centre exhaust.
The most recent power run shows a power curve of similar shape to that of the car when it was standard although it drops off at the top end. The torque curve is more of a surprise though as there is a big drop off at about 3000rpm (typically the point you would expect a GTA to come to life) and it tails off quite low at the top of the rev range.
It is not easy to interpret as everything is to a different scale but on the 2009 stock run torque at the limiter was close to 200FtLb and with the remap in 2011 comfortably over the 200 mark. It is now in the low 170's.
Is this large drop in power explained away by the map no longer suiting the exhaust set up or are their likely to be other issues at play? Any advice would be appreciated.
[guys on AROC have suggested the MAF which sounds promising but also suggested I get it terracleaned and do a compression test]
Had a disappointing visit to the local dyno yesterday with my 2005 147 GTA. I have had my suspicions that the car was a bit down on power but it still drives well and is deafeningly loud so all still fun to annoy the neighbours. However, some 30 horses have escaped which took me by surprise. It does explain how a celica GT4 and a Mini Cooper gave it a run for its money in recent months though...
I first had the car RR'd in 2009 as a completely stock car and it made 251bhp. I subsequently has a K&N panel filter added with CF2 manifolds, equal length front pipes (which swap over the front and rear banks although this is compensated for my swapping the lambda sensors over) and a cat-back scorpion exhaust and without a remap, it made 269bhp in 2011. Just goes to show how adaptable the ECU is.
A new map was put on the car which massaged that up to 273bhp; for my £400 I felt this was disappointing. The technician changed the map further but couldn't test it on the dyno due to it being faulty so no idea what that actually did. When I was able to get the car back on the RR later in the year it only made 260bhp due to the intake being split.
In the years since, I have started running the car on Super Unleaded and crucially have changed my exhaust set up significantly. I now run wizard front pipes which are more similar in design to standard (so the exhaust banks are swapped back to standard) and the free flowing wizard rear section and centre exhaust.
The most recent power run shows a power curve of similar shape to that of the car when it was standard although it drops off at the top end. The torque curve is more of a surprise though as there is a big drop off at about 3000rpm (typically the point you would expect a GTA to come to life) and it tails off quite low at the top of the rev range.
It is not easy to interpret as everything is to a different scale but on the 2009 stock run torque at the limiter was close to 200FtLb and with the remap in 2011 comfortably over the 200 mark. It is now in the low 170's.
Is this large drop in power explained away by the map no longer suiting the exhaust set up or are their likely to be other issues at play? Any advice would be appreciated.
[guys on AROC have suggested the MAF which sounds promising but also suggested I get it terracleaned and do a compression test]
