Green Dot cams pulley - first impressions
Discussion
WHile doing the timing belt I ordered a new green dot cam pulley and put it on the intake, and also moved the aux green dot pully up to the exhaust.
The engine really runs and sounds different.
The idle is rougher for sure, and there is a whole not more sound to the exhaust.... the exhaust also pops more on overrun...(Sounds cool.....)
Rainy day here so no realy comment on driving power, but there is for sure a noticible difference.
Does anyone have any idea what sort of power change you really get from this?..
The engine really runs and sounds different.
The idle is rougher for sure, and there is a whole not more sound to the exhaust.... the exhaust also pops more on overrun...(Sounds cool.....)
Rainy day here so no realy comment on driving power, but there is for sure a noticible difference.
Does anyone have any idea what sort of power change you really get from this?..
Hi,
The pulley swap ain't that big a deal. You have to be careful not to raise your expectaion level unrealistically. It is no Hyper-Horsepower fix.
Probably no more than a 3HP increase (and I doubt even half that). Not even detectable by the 'ol Butt Dyno (anyone saying it is has found the Placebo Effect). What it does do is smooth out the power/torque curve slightly and make the engine run a little smoother.
It is worthwhile, to a point. For the earlier cars, which already had the 'spare' pulley on the Aux. shaft, it was a no-brainer. If you have to go and buy two pulleys, not a lot of cost/benefit to that one.
Happy Motoring! ...Jim '00 Boxster
>> Edited by lotusguy on Tuesday 24th May 07:33
The pulley swap ain't that big a deal. You have to be careful not to raise your expectaion level unrealistically. It is no Hyper-Horsepower fix.
Probably no more than a 3HP increase (and I doubt even half that). Not even detectable by the 'ol Butt Dyno (anyone saying it is has found the Placebo Effect). What it does do is smooth out the power/torque curve slightly and make the engine run a little smoother.
It is worthwhile, to a point. For the earlier cars, which already had the 'spare' pulley on the Aux. shaft, it was a no-brainer. If you have to go and buy two pulleys, not a lot of cost/benefit to that one.
Happy Motoring! ...Jim '00 Boxster
>> Edited by lotusguy on Tuesday 24th May 07:33
lotusguy said:I will counter that with my car can now accelerate up my driveway where it could not before. It would literally chug up in 1st gear at 1000rpm, foot to the floor. Now it will gradually accelerate and I have to lift about 1/2 way up.
Not even detectable by the 'ol Butt Dyno (anyone saying it is has found the Placebo Effect).
Leaving the line is easier too. My impression was that it ran slightly better off-boost, no discernable change on-boost. As Jim says, don't expect to unleash the beast within but I was happy with the improvement.
i would suspect that using HP as a measure for this imrovement is useless....
THe engine produced different HP throughout its operating range yet for some reason everyone wants to know the peak HP.
We all know that torque accelerates and HP overcomes top speed issues.. and somehow we endlessly talk about peak HP
there are many cases where peak HP does not change with a modification but somewhere else in the curve significant gains can be made..
imagine that an engine has 40 HP at 1500 rpm... a 4 hp improvement at 1500 is 10% - very significant there.
there are flat spots in the curve of these small 4cyl turbos and I think that we need to be much more careful about where we need to improve.
working on the low end smoothness will get us all to that fabulous boost sooner...
Bruce
THe engine produced different HP throughout its operating range yet for some reason everyone wants to know the peak HP.
We all know that torque accelerates and HP overcomes top speed issues.. and somehow we endlessly talk about peak HP
there are many cases where peak HP does not change with a modification but somewhere else in the curve significant gains can be made..
imagine that an engine has 40 HP at 1500 rpm... a 4 hp improvement at 1500 is 10% - very significant there.
there are flat spots in the curve of these small 4cyl turbos and I think that we need to be much more careful about where we need to improve.
working on the low end smoothness will get us all to that fabulous boost sooner...
Bruce
mike.griese said:If you saw my driveway, you wouldn't say that.
I will counter that with my car can now accelerate up my driveway where it could not before. It would literally chug up in 1st gear at 1000rpm, foot to the floor.
Sounds like you had other problems.
Ask Atwell how steep it is. I had the pulleys changed as part of a C service + cam tower reseal but nothing else (plugs, wires, chip, etc) was touched.
Cross-eyed-twit said:It's just very steep with a tight turn and I go up with no run up. The top of the driveway is higher than the peak of the roof of the house. It's steep enough that when I ride my bicycle, I carry it up the stairs first rather than riding - not because I can't (actually, I've never tried on my road bike, come to think of it) but because it's too hard on my knees before I've warmed up.
Blimey, MikeyRide, do you live up a tree or something???
My ancient BMW 528e automatic can just barely restart from stopped at certain points up the hill. I was almost unable to reverse out with our open-differential 318is last week just from the spring coating of tree-dropped junk.
Did I mention it's pretty steep?
I thought my driveway was bad. You win.
It did take me 2 days once to dig two tire tracks 200' through the snow and ice so I could get a truck out and go buy some chains. Roy did drive past it 2-3 times thinking "I don't think I can get the rental car down there, that couldn't possibly be a drive way an Esprit could get down."
Actually, I think most of the people in Arkansas that have 4WD have it to transverse their driveways.
Dr.Hess
>> Edited by Dr.Hess on Wednesday 25th May 21:31
It did take me 2 days once to dig two tire tracks 200' through the snow and ice so I could get a truck out and go buy some chains. Roy did drive past it 2-3 times thinking "I don't think I can get the rental car down there, that couldn't possibly be a drive way an Esprit could get down."
Actually, I think most of the people in Arkansas that have 4WD have it to transverse their driveways.
Dr.Hess
>> Edited by Dr.Hess on Wednesday 25th May 21:31
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