I had my car rolling roaded today, as I knew it wasn\'t as quick as it should be. However, the car only put out 179.9bhp at the fly and 190.6 lb/ft!
The car is a 1992 Mazda RX7 type R (we think). It has a decat, cat back exhaust, Re-amemiya filter and a Power FC running on the base map.
When I originally bought the car, there were some issues with the turbos that meant that the turbo pack had to be replaced, but AFAIK, it was the turbo pack only and not anything else that was replaced.
These are the graphs that I got from the rolling road.
(http://www.cruisesouthwest.co.uk/modules/Gallery/albums/album60/figures1.jpg)
(http://www.cruisesouthwest.co.uk/modules/Gallery/albums/album60/power2.jpg)
(http://www.cruisesouthwest.co.uk/modules/Gallery/albums/album60/torque2.jpg)
Looking at the torque graph (the second one), it looks like the torque starts to drop off at about 3.5k.
Obviously theres something majorly wrong with the car, as it should be far more than this standard. It did have some leaking boost pipes, which have been replaced, but due to the fact that it does seem sluggish higher up the revs, would it indicate a problem with the turbos, or more specifically, something to do with the second turbo?
Thanks
Also, I must add that I have a normal boost gauge, plumbed into the intake, as well as the boost gauge on the Apexi commander. Both seem to show different figures. The Apexi shows no more than 0.6 bar, but the normal boost gauge shows just under 1 sometimes.
Again, does this indicate a problem somewhere?
What sort of boost pattern is the boost guage showing? In psi it should be 10 up to 4500rpm then a quick dip to 8, then stay at 10 all the way to redline as the 2nd turbo comes online.
psi = Bar x 14.7 IIRC
Jon
It looks as though the 2nd turbo isn\'t firing as it should be????
As a standard rx should make more than that:(
QuoteIt looks as though the 2nd turbo isn\'t firing as it should be????
Thats what i thought, it looks as though the power maxes at 4500 to 5000 rpm, where the 2nd turbo should come online...
Let us know Dan
Jon
Well my clutch has decided to go now, so I can\'t get any decent boost readings for the moment until the clutch is replaced. I did try and keep an eye on it briefly, and the boost seems to hit just under 1 bar, then fall but not rise to the same position again. I\'m going to get the clutch changed, then let ross look at the car and go from there. If its a problem with the solenoids, i\'ll probably end up getting them converted over to parallel instead of sequential.
Dan, I reckon the clutch might be the simple answer to your problem. When they\'re on the way out they usually start to slip at about 3500rpm. Now if your clutch has gone it was probably on the way out on the dyno. So, if it starts to slip at the point the torque should be high, then this would explain the drop at that point and the lack of torque thereafter. The power just ain\'t getting to the wheels.
£411 at RX Motors should see you right!
It\'s only slipping if I put my foot down, rather than when I do it slowly, but until the clutch is done, we can\'t really be 100% sure. I\'m going for an act clutch at the moment, which should see me for £480 fitted.