Fresh802 Posted February 12, 2015 Report Share Posted February 12, 2015 Alright, so i have a 1989 chrysler conquest tsi. i hear that you should be boosting 7psi until around 4k rpm. And then 10psi after that. Mine does the exact opposite. so i get 10psi at lower rpms but then it drops to 7psi after 4k. My idle is high also around 1500. sometimes it idles around 1000 but usually 1500. Any help would be greatly appreciated. is there a way to make it just run 10psi all the time? Im not sure how the wastegate works on this car, any other car i would have just installed a boost controller and been done with it. But I am wondering also how the car goes about a 2 step boost setup. thanks! Quote Link to comment Share on other sites More sharing options...
speedyquest Posted February 12, 2015 Report Share Posted February 12, 2015 It sounds like for your idle issues you need to do a tps / isc reset. Just take a look at the service manual (you can get it at starquestgarage.com) and follow the instructions to reset everything correctly. As far as your boost issue is concerned it sounds like your vacuum sources for the wastegate are just switched around. The 88-89 cars have a 3 port wastegate, one is a reference port, one is for 7psi, and the last for 10psi. Just do a quick search on the forums and you will find the solution to making it always run 10psi. Allen Quote Link to comment Share on other sites More sharing options...
Fresh802 Posted February 12, 2015 Author Report Share Posted February 12, 2015 It sounds like for your idle issues you need to do a tps / isc reset. Just take a look at the service manual (you can get it at starquestgarage.com) and follow the instructions to reset everything correctly. As far as your boost issue is concerned it sounds like your vacuum sources for the wastegate are just switched around. The 88-89 cars have a 3 port wastegate, one is a reference port, one is for 7psi, and the last for 10psi. Just do a quick search on the forums and you will find the solution to making it always run 10psi. Allen Thank you very very much! Well, I just gave a good hard search on the whole 10psi thing. Couldnt find anything. But Ill put my car in the garage tonight and reset the tps/isc. I appreciate it very much. If you have any direct info on the 10psi thing let me know, or if you find anything referring to it. -thanks! Quote Link to comment Share on other sites More sharing options...
speedyquest Posted February 12, 2015 Report Share Posted February 12, 2015 After doing a bit of reading it looks like you should leave the middle port (middle of the actuator) open to the air, then use either of the outer ports for your vacuum source, then cap the other outer one you didn't use. That should set you up to always run 10psi. Quote Link to comment Share on other sites More sharing options...
Fresh802 Posted February 12, 2015 Author Report Share Posted February 12, 2015 How could i not find that? haha. Seems simple enough. Ill give it a go on saturday. I would just like to say, I am on miata forums too and the help ive gotten here in one day has been better than the help ive had in a year on the miata forums. haah. and for that, i thank you. Quote Link to comment Share on other sites More sharing options...
scott87star Posted February 12, 2015 Report Share Posted February 12, 2015 Given that Turbine Inlet Pressure (TIP) goes up exponentially with boost pressure consider that you may be making more power at 7 psi above 4K. A dyno would (dis)prove it. Quote Link to comment Share on other sites More sharing options...
Fresh802 Posted February 13, 2015 Author Report Share Posted February 13, 2015 Given that Turbine Inlet Pressure (TIP) goes up exponentially with boost pressure consider that you may be making more power at 7 psi above 4K. A dyno would (dis)prove it. I 100% understand what you are saying, But you can really tell the difference in power when its drops from 10 to 7. Quote Link to comment Share on other sites More sharing options...
ucw458 Posted February 13, 2015 Report Share Posted February 13, 2015 The ignitor controls the solenoid on the aircan that switches between 7 and 10 psi. It will lower the boost if it senses knock. Quote Link to comment Share on other sites More sharing options...
Fresh802 Posted February 13, 2015 Author Report Share Posted February 13, 2015 Shouldnt it b e at 7psi before 4k anyways? so if its at 10psi before 4k then wouldnt the theory that my vacuum lines are switched up make sense? Quote Link to comment Share on other sites More sharing options...
Fresh802 Posted February 13, 2015 Author Report Share Posted February 13, 2015 After doing a bit of reading it looks like you should leave the middle port (middle of the actuator) open to the air, then use either of the outer ports for your vacuum source, then cap the other outer one you didn't use. That should set you up to always run 10psi. My wastegate has 3 ports yes. but it seems that one is on top of the other? not positioned like this . . . more like this : . Quote Link to comment Share on other sites More sharing options...
ucw458 Posted February 13, 2015 Report Share Posted February 13, 2015 If I remember correctly, manual trans cars went from 7 to 10. Auto cars stayed at 10. The parts that controlled the switch can be swapped from car to car. The actuator has a big end and a small end. The port on the small end is 7 psi (leave open). The 2 other ports are both 10 psi. You run a line to one of them and cap the other one. Quote Link to comment Share on other sites More sharing options...
Fresh802 Posted February 13, 2015 Author Report Share Posted February 13, 2015 Yes you are correct about the 7 to 10, but mine is backwards. goes 10 to 7. haha. Thanks for the help! Quote Link to comment Share on other sites More sharing options...
Fresh802 Posted February 13, 2015 Author Report Share Posted February 13, 2015 what if i told you i had 2 ports on the small end. and 1 on the big end Quote Link to comment Share on other sites More sharing options...
Fresh802 Posted February 13, 2015 Author Report Share Posted February 13, 2015 what if i told you i had 2 ports on the small end. and 1 on the big end Quote Link to comment Share on other sites More sharing options...
Fresh802 Posted February 13, 2015 Author Report Share Posted February 13, 2015 If I remember correctly, manual trans cars went from 7 to 10. Auto cars stayed at 10. The parts that controlled the switch can be swapped from car to car. The actuator has a big end and a small end. The port on the small end is 7 psi (leave open). The 2 other ports are both 10 psi. You run a line to one of them and cap the other one. Mine has 2 ports on the small part and 1 on the big part. 1 from the small end and one from the big end both go to a small black plastic piece that seems to connect to the airbox? while the other one connects directly to the plastic tubing that runs across the top of the valve cover. Quote Link to comment Share on other sites More sharing options...
Fresh802 Posted February 13, 2015 Author Report Share Posted February 13, 2015 Figured it out. Only part im wondering now is what do i do with the little black plastic piece that 2 of the lines were attached to? it also has a electrical plug on it. Quote Link to comment Share on other sites More sharing options...
ucw458 Posted February 14, 2015 Report Share Posted February 14, 2015 Figured it out. Only part im wondering now is what do i do with the little black plastic piece that 2 of the lines were attached to? it also has a electrical plug on it. The ignitor controls the solenoid on the aircan that switches between 7 and 10 psi. unplug it Quote Link to comment Share on other sites More sharing options...
Fresh802 Posted February 14, 2015 Author Report Share Posted February 14, 2015 Did it. Its still not wanting to run 10psi. Ill look more into it today I guess. Quote Link to comment Share on other sites More sharing options...
Fresh802 Posted February 16, 2015 Author Report Share Posted February 16, 2015 Is it normal to lose a little boost at high rpm with a stock turbo? due to the engine needing more air and the turbo not being able to create enough air flow to get the full 10psi while the engine is sucking more air. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.