Increasing Boost in 3rd and 4th gears

[TurboHogg]

I have changed my computer system sometime ago to the 87 ecm. I have someone working with me on the chips and the boost on the chip is set up to remove a small precentage of boost threw 3rd and 4th gears. I am not getting that I am seeing a increase in boost in 3rd and 4th gears. This increase is not a small little creap I am talking 2nd to 3rd 2psi increase and 3rd to 4th 2psi more for a total of 21psi. this making the car very difficult to program chips for. Has anyone seen this problem using the 84 waste gate with a 87 ecm is there any modifications that need to be made to the vaccumm configuration. Any additional information needed to solve this problem would be greatly appreciated. Thanks Tracy

 

[cool 84]

Mine always did that. You can enlarge the wastegate hole on the turbo and make sure the wastegate is functioning properly. I changed mine over to the 87 style and it didn't fix it. Also enlarged the hole and it still didn't work right but it works for some people. It didn't seem to creep as much with the big turbo on there but it still crept which made tuning very hard not to mention the boost was different from run to run. I finally broke down and bought a nice external gate.