How Fast Does Your Turbo Spool?
Thread Starter
Senior Member
Joined: Jan 2003
Posts: 2,871
From: London, Ontario
Try an interesting little trick. This has been debated on the other forum briefly.
Put you car in neutral and let the idle settle (no cheating
)
Jam you foot on the gas and take it to redline.
What manifold pressure do you reach? Datalogging is the most accurate way to tell of course.
I just gave this a try. My car is not tuned at all, I've only been tuning the vacuum bars using a narrow band O2 sensor in an attempt to improve around town driveability and fuel mileage while attempting to sort out ECU glitches. (All better now!!!)
Here is what I got on stock ports and a GT42 hybrid. Some numbers from other popular turbos would be nice for comparison. Stock turbos too. Please mention any porting you have.
FYI 20.53 Kpa translates to 2.98 PSI
Put you car in neutral and let the idle settle (no cheating
Jam you foot on the gas and take it to redline.
What manifold pressure do you reach? Datalogging is the most accurate way to tell of course.
I just gave this a try. My car is not tuned at all, I've only been tuning the vacuum bars using a narrow band O2 sensor in an attempt to improve around town driveability and fuel mileage while attempting to sort out ECU glitches. (All better now!!!)
Here is what I got on stock ports and a GT42 hybrid. Some numbers from other popular turbos would be nice for comparison. Stock turbos too. Please mention any porting you have.
FYI 20.53 Kpa translates to 2.98 PSI
Thread Starter
Senior Member
Joined: Jan 2003
Posts: 2,871
From: London, Ontario
Of course. If I wanted to get really high boost I'd just flip the anti-lag switch.
That isn't the point. The point is I would like to compare different turbos to see response. My timing in the vacuum bars is within a few degrees of what most maps I see posted are. My fuel is likely only a little bit rich as I have been fiddling with it using the O2 sensor voltage readout.
People always claim this and that about boost response in different turbos, some real data would be appreciated, I think.
That isn't the point. The point is I would like to compare different turbos to see response. My timing in the vacuum bars is within a few degrees of what most maps I see posted are. My fuel is likely only a little bit rich as I have been fiddling with it using the O2 sensor voltage readout.
People always claim this and that about boost response in different turbos, some real data would be appreciated, I think.
Senior Member
Joined: May 2002
Posts: 22,465
From: California
Originally Posted by TYSON' date='Sep 18 2003, 09:47 AM
Of course. If I wanted to get really high boost I'd just flip the anti-lag switch.
That isn't the point. The point is I would like to compare different turbos to see response. My timing in the vacuum bars is within a few degrees of what most maps I see posted are. My fuel is likely only a little bit rich as I have been fiddling with it using the O2 sensor voltage readout.
People always claim this and that about boost response in different turbos, some real data would be appreciated, I think.
That isn't the point. The point is I would like to compare different turbos to see response. My timing in the vacuum bars is within a few degrees of what most maps I see posted are. My fuel is likely only a little bit rich as I have been fiddling with it using the O2 sensor voltage readout.
People always claim this and that about boost response in different turbos, some real data would be appreciated, I think.
mike
Senior Member
Joined: Jan 2003
Posts: 8,079
From: union, new jersey
Originally Posted by j9fd3s' date='Sep 18 2003, 02:43 PM
[quote name='TYSON' date='Sep 18 2003, 09:47 AM'] Of course. If I wanted to get really high boost I'd just flip the anti-lag switch.
That isn't the point. The point is I would like to compare different turbos to see response. My timing in the vacuum bars is within a few degrees of what most maps I see posted are. My fuel is likely only a little bit rich as I have been fiddling with it using the O2 sensor voltage readout.
People always claim this and that about boost response in different turbos, some real data would be appreciated, I think.
That isn't the point. The point is I would like to compare different turbos to see response. My timing in the vacuum bars is within a few degrees of what most maps I see posted are. My fuel is likely only a little bit rich as I have been fiddling with it using the O2 sensor voltage readout.
People always claim this and that about boost response in different turbos, some real data would be appreciated, I think.
mike [/quote]
you are correct sir.... sometimes a lil over