Dynoed my car
03-20-2015, 07:42 AM
#1
Dynoed my car
Had a session yesterday with my new turbo. Turns out the T4 .68 house is to small, so we stopped at 1.1 bar boost. Notice how much blow through there is on the video, it is not hard to understand why cars with stock AOS have pressure problems. My modded AOS with 1 3/8" is to big. Air/Oil spearation is no problem on idle and high load, but during cruising there is not enough flow and the AOS dumps quite a lot of oil in the cath can. Made a band aid fix with a lid that restricted flow. New try is a opened up stock size AOS outlet.
03-20-2015, 09:52 AM
#2
Three Wheelin'
You don't run any additional breather hose from cam cover or other place?
Yours is 3.0? In that case .68 is too small indeed, my friend Kert had 3.0 16v and GT3582R with .82 hot side, changed it to 1.06 and did not loose any response, but gained 30 Nm instead without adjusting ignition..
Nevertheless, nice result!
Yours is 3.0? In that case .68 is too small indeed, my friend Kert had 3.0 16v and GT3582R with .82 hot side, changed it to 1.06 and did not loose any response, but gained 30 Nm instead without adjusting ignition..
Nevertheless, nice result!
03-20-2015, 01:29 PM
#3
You don't run any additional breather hose from cam cover or other place?
Yours is 3.0? In that case .68 is too small indeed, my friend Kert had 3.0 16v and GT3582R with .82 hot side, changed it to 1.06 and did not loose any response, but gained 30 Nm instead without adjusting ignition..
Nevertheless, nice result!
Yours is 3.0? In that case .68 is too small indeed, my friend Kert had 3.0 16v and GT3582R with .82 hot side, changed it to 1.06 and did not loose any response, but gained 30 Nm instead without adjusting ignition..
Nevertheless, nice result!
EDIT: Even tho the dyno plot of the two different turbos look identical, the feel of the smaller one is very different. I realize that a dyno does not tel anything about how the car actually is to drive. I am pretty sure that there is 1 bar boost at 3000ish RPM on 4. and maybe also 3.
Last edited by KSira; 03-20-2015 at 03:38 PM.
03-20-2015, 09:43 PM
#6
Rennlist Member
There's no wheelspin to support that dip either?
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03-21-2015, 09:30 AM
#8
Nordschleife Master
The dip looks like you're running 968 cams with variocam?
T4 0.68 is not that small but if you want to run above 1.1 bar it makes sense to increase it.
T4 0.68 is not that small but if you want to run above 1.1 bar it makes sense to increase it.
03-22-2015, 06:12 AM
#9
The turbo is a Precision 5866. Not sure why there is a dip, it might be because of a slight overboost. It has been this way with three different tuners and three different turbos.
03-22-2015, 06:19 AM
#12
03-22-2015, 07:47 AM
#14
For what it's worth both the S2 and 968 feature dips in their officially-published factory torque curves. In the case of the S2 I would think it may be caused by a "restricted" tune, as the long runner intake should provide great ram effect between 2.5k and 3.5k rpm, where the dip occurs.
Do you mean you have some kind of overboost protection that may have kicked in at the moment of the dip?
Do you mean you have some kind of overboost protection that may have kicked in at the moment of the dip?
03-22-2015, 12:29 PM
#15
For what it's worth both the S2 and 968 feature dips in their officially-published factory torque curves. In the case of the S2 I would think it may be caused by a "restricted" tune, as the long runner intake should provide great ram effect between 2.5k and 3.5k rpm, where the dip occurs.
Do you mean you have some kind of overboost protection that may have kicked in at the moment of the dip?
Do you mean you have some kind of overboost protection that may have kicked in at the moment of the dip?
EDIT: He also told me he had some slight trouble controlling the boost. Looking at my first dyno that where 1 bar, the dip is not present. The only changes are the tune and turbo.