GTX4202 VS S376 test this Sat
10-29-10, 01:55 PM
#16
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Big day tomorrow. I have been dialing in the boost controller, and the fuel table today, since upgrading this car to the newest firm ware. So far the Garrett is doing quite well with the following results.
641 @ 18psi
725 @ 25psi
850 @ 30psi
975 @ 35psi
I am about to make a 38psi hit. I expect it to do 1050ish.
641 @ 18psi
725 @ 25psi
850 @ 30psi
975 @ 35psi
I am about to make a 38psi hit. I expect it to do 1050ish.
Last edited by TPS; 10-29-10 at 02:02 PM.
10-29-10, 05:56 PM
#17
Big day tomorrow. I have been dialing in the boost controller, and the fuel table today, since upgrading this car to the newest firm ware. So far the Garrett is doing quite well with the following results.
641 @ 18psi
725 @ 25psi
850 @ 30psi
975 @ 35psi
I am about to make a 38psi hit. I expect it to do 1050ish.
641 @ 18psi
725 @ 25psi
850 @ 30psi
975 @ 35psi
I am about to make a 38psi hit. I expect it to do 1050ish.
10-29-10, 06:24 PM
#18
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Uncorrected, 4th gear, some cool down between, about 40% humid @ 89 degrees. All would have a 1.01 correction factor SAE.
I did not hit the 1050ish number. The turbo is not liking the higher pressure. I am having to crank the boost control duty cycle up exponentially, and the boost is still falling off. I did hit 984 with a peak boost of 39psi, and falling off to 35psi. It is happy up until 35 psi, then starts to fall on its face. I do believe we have found the choke point.
I may try throwing a little timing at it tomorrow to get the back pressure down and see if we can squeeze a little more boost out of it.
I did not hit the 1050ish number. The turbo is not liking the higher pressure. I am having to crank the boost control duty cycle up exponentially, and the boost is still falling off. I did hit 984 with a peak boost of 39psi, and falling off to 35psi. It is happy up until 35 psi, then starts to fall on its face. I do believe we have found the choke point.
I may try throwing a little timing at it tomorrow to get the back pressure down and see if we can squeeze a little more boost out of it.
Last edited by TPS; 10-29-10 at 06:28 PM.
10-30-10, 06:04 PM
#28
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I would say Bullseye did quite well. The car sure held the higher boost levels much better on the Bullseye unit over the Garrett, and the car was running much cleaner with that unit on there. I did not make any fuel or timing changes from one unit to the next. I did make some boost controller duty cycle changes to try and match things up. For example, the BEP unit at 35 psi was a nice flat 35psi, and the Garrett unit on the 38 psi run was a spike to 42 psi then falling to 34. That is why I call it a 38 psi average. The turbine wheel does not work that well in the higher level IMHO. The Garrett unit also has a few miles on it, the BEP was brand new and had 5 minutes run time before the first hit at 18psi. It could use a few miles to loosen up, but these are the results as they are.
I posted the runs with three displays for each. Max power, conditions, and the file name including the boost level. Yall can match them up as you like.
I posted the runs with three displays for each. Max power, conditions, and the file name including the boost level. Yall can match them up as you like.
