Too much back pressure?
TECH Regular
Joined: Jul 2019
Posts: 460
Likes: 44
I have EBC, I set everything to 0% then raised only the duty cycle until hit close to my boost. Then played with gain very little bits. At first I had vacuum lines plumbed to only one side of wastegate and it was a struggle for sure. Once I hooked up vacuum lines (correctly) to both side of the wastegate, it was so much better. Not sure if you have 2 nipples on your WG or not.
Thread Starter
Staging Lane
Joined: Jan 2016
Posts: 56
Likes: 14
I have EBC, I set everything to 0% then raised only the duty cycle until hit close to my boost. Then played with gain very little bits. At first I had vacuum lines plumbed to only one side of wastegate and it was a struggle for sure. Once I hooked up vacuum lines (correctly) to both side of the wastegate, it was so much better. Not sure if you have 2 nipples on your WG or not.
Staging Lane
Joined: May 2021
Posts: 97
Likes: 11
There was an older design, say 5-6 years ago or more, where the bolts that hold the diff case assy together were shearing and failing. But Allison beefed up the housing and added more bolts and thus all the new ones do not have that weakness. I made sure I had the newer version when I ordered it.
Why does boost / tq seem so laggy? Not hating on you or car!
I had a tune that looked like this before and turned out the timing was super low on the bottom end going up to like 4psi. Got it retuned by someone else and he said need low end timing to get turbos going. Car is 600+ tq by 4000rpm now. Night and day. Same setup but diff tuners.
I had a tune that looked like this before and turned out the timing was super low on the bottom end going up to like 4psi. Got it retuned by someone else and he said need low end timing to get turbos going. Car is 600+ tq by 4000rpm now. Night and day. Same setup but diff tuners.
I’m quite surprised at the gains at that low of boost/power. It’s a great test though thanks for showing us. You went to the 1.02 right? Can you have the dyno shop overlay the old vs new?
Thread Starter
Staging Lane
Joined: Jan 2016
Posts: 56
Likes: 14
Don’t know what the limit of pump gas is. But you seem to see 550-650 max on pump with no meth
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Verdad Gallardo Did you want more than 600hp? You can keep going on pump but you have to keep timing in check, when I ran ~20PSI on 93 I couldn't get more than 11-12* in it without it complaining.
Thread Starter
Staging Lane
Joined: Jan 2016
Posts: 56
Likes: 14
im not too sure if I want to push it much past that on pump. It gains 20hp per lb of boost and the motor seems healthy (175psi on all 8) yet the power seems low for that amount of boost. We are definitely adding timing till the power it picks up is only 10hp per deg. And the plugs are showing that as well.
im going to test my map sensor to see if it’s reading the right amount of boost. It’s a ZR1 3 bar map. The haltech had the calibration for it.
im not too sure if I want to push it much past that on pump. It gains 20hp per lb of boost and the motor seems healthy (175psi on all 8) yet the power seems low for that amount of boost. We are definitely adding timing till the power it picks up is only 10hp per deg. And the plugs are showing that as well.
im going to test my map sensor to see if it’s reading the right amount of boost. It’s a ZR1 3 bar map. The haltech had the calibration for it.
im going to test my map sensor to see if it’s reading the right amount of boost. It’s a ZR1 3 bar map. The haltech had the calibration for it.
Thread Starter
Staging Lane
Joined: Jan 2016
Posts: 56
Likes: 14
im running 8psi springs but it goes to 11psi. But I don’t think that’s anything too odd.
