Hi all, I bought my 07 Manual MazdaSpeed 8 in November, it had 50,000kms - it's at 64,500 now.
I've done a bit of work to it - replaced all fluids (Except coolant), D585 ignition, removed CAT, new coolant temp sensor, new brakes & rotors, lowered the car. I used to have poor MPG but am now stably getting 16 in the city. I only use 91 gas from PetroCanada or Shell.
My issue is that in hot temperatures the car does not feel as swift - I don't get the same feeling of being pushed back into my seat when I accelerate. It also hesitates/bucks/jerks when in low gear with with my foot off the throttle. These symptoms never happen late at night for me and the engine braking feels very smooth and runs down to 800rpm without any bucking/jerking/hesitation.
I have a weird starting issue it's hard to describe and it only happens when the engine is turned off hot & has had about 45 minutes to cool down. Normally my starts are like: tick, tick, boom - the car starts and the rpms shoot up immediately to 1300-1500 at this temp range. Sometimes however, I just get a tick, boom and the rpms gradually increase to 1300-1500 from 0. Very weird seeing this.
Not sure if it's related but I wanted to include it just so I don't miss anything.
I red-line the car every day, multiple times, 1st and second. Whenever I get a chance on the highway I red-line in 3rd.
My idle at night is spot on.... 800 rpm no deviation @ operating temp, no shaking, but during a hot day I see it dip and bounce around with a variance of +-50; if the AC is on I see it dip down to 750 sometimes.
I used to use Royal Purple but GTX feels smoother (10W40) and is half the price so I'd rather just change it more often.
Is it cooling? My ignition has less than 10,000KM on it. I really don't think it's compression the car is pretty well-maintained. Not sure where to start troubleshooting.
I have a OBDII unit, I could take logs of when it's sluggish and compare it to night values but I'm unsure of which values to log.
Any help would be appreciated.
I've done a bit of work to it - replaced all fluids (Except coolant), D585 ignition, removed CAT, new coolant temp sensor, new brakes & rotors, lowered the car. I used to have poor MPG but am now stably getting 16 in the city. I only use 91 gas from PetroCanada or Shell.
My issue is that in hot temperatures the car does not feel as swift - I don't get the same feeling of being pushed back into my seat when I accelerate. It also hesitates/bucks/jerks when in low gear with with my foot off the throttle. These symptoms never happen late at night for me and the engine braking feels very smooth and runs down to 800rpm without any bucking/jerking/hesitation.
I have a weird starting issue it's hard to describe and it only happens when the engine is turned off hot & has had about 45 minutes to cool down. Normally my starts are like: tick, tick, boom - the car starts and the rpms shoot up immediately to 1300-1500 at this temp range. Sometimes however, I just get a tick, boom and the rpms gradually increase to 1300-1500 from 0. Very weird seeing this.
Not sure if it's related but I wanted to include it just so I don't miss anything.
I red-line the car every day, multiple times, 1st and second. Whenever I get a chance on the highway I red-line in 3rd.
My idle at night is spot on.... 800 rpm no deviation @ operating temp, no shaking, but during a hot day I see it dip and bounce around with a variance of +-50; if the AC is on I see it dip down to 750 sometimes.
I used to use Royal Purple but GTX feels smoother (10W40) and is half the price so I'd rather just change it more often.
Is it cooling? My ignition has less than 10,000KM on it. I really don't think it's compression the car is pretty well-maintained. Not sure where to start troubleshooting.
I have a OBDII unit, I could take logs of when it's sluggish and compare it to night values but I'm unsure of which values to log.
Any help would be appreciated.
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