BoostedStroker Posted March 26, 2015 Report Share Posted March 26, 2015 Hey ya'll, i just picked up a 87 Chrysler Conquest TSI. Car has 141k on it, motor has 13k on it and the 5 speed manual trans. has 18k on it. Turbo is in good shape with no shaft play. Upgrades that i know of are... Aftermarket intercooler, BOV, Igition coil, 2 1/2" downpipe, 2 1/2" exhaust with a borla muffler, K&N intake, Autometer boost gauge, A/F gauge. I just ordered a manual boost controller and was wanting to know how much boost i can run on the stock turbo safely? Also for upgrades where should i go after the boost controller? How much can the stock turbo handle when its in good shape? What do these cars normally dyno at with a stock turbo on 12-15psi? Quote Link to comment Share on other sites More sharing options...
psu_Crash Posted March 26, 2015 Report Share Posted March 26, 2015 I would highly recommend getting a wideband air/fuel gauge on there before you try to up the boost. That way you know that you aren't leaning it out at all.What is "safe"? Stock boost levels Quote Link to comment Share on other sites More sharing options...
TexasQuest Posted March 26, 2015 Report Share Posted March 26, 2015 Make sure everything is in good shape before cranking the boost up. Quote Link to comment Share on other sites More sharing options...
BoostedStroker Posted March 26, 2015 Author Report Share Posted March 26, 2015 I would highly recommend getting a wideband air/fuel gauge on there before you try to up the boost. That way you know that you aren't leaning it out at all.What is "safe"? Stock boost levels It does have a autometer air fuel gauge, as stated everything mechanically is good shape and or has been rebuilt recently. Quote Link to comment Share on other sites More sharing options...
BoostedStroker Posted March 26, 2015 Author Report Share Posted March 26, 2015 (edited) I also heard the stock 87 ECU cuts fuel at certain psi? Edited March 26, 2015 by BoostedStroker Quote Link to comment Share on other sites More sharing options...
ls1rx7 Posted March 26, 2015 Report Share Posted March 26, 2015 Auto meter a/f gauge isn't a wideband, post pics of your engine bay, turbo, and intercooler Quote Link to comment Share on other sites More sharing options...
BoostedStroker Posted March 26, 2015 Author Report Share Posted March 26, 2015 Auto meter a/f gauge isn't a wideband, post pics of your engine bay, turbo, and intercooler Sorry after looking at it, it is a narrowband autometer air/fuel gauge. I just got the car 3 days ago so no pictures yet. Quote Link to comment Share on other sites More sharing options...
ls1rx7 Posted March 26, 2015 Report Share Posted March 26, 2015 What intercooler is on it Quote Link to comment Share on other sites More sharing options...
BoostedStroker Posted March 26, 2015 Author Report Share Posted March 26, 2015 What intercooler is on itI have no idea to be honest, previous owner said the owner before him installed it. It dosent look to old as the front air dam has seen some serious damage but the intercooler has no damage to it. Quote Link to comment Share on other sites More sharing options...
ls1rx7 Posted March 26, 2015 Report Share Posted March 26, 2015 Just so you know most of these cars came stock with a front mount. Quote Link to comment Share on other sites More sharing options...
BoostedStroker Posted March 26, 2015 Author Report Share Posted March 26, 2015 Just so you know most of these cars came stock with a front mount.Oh ok, just looking at pictures the piping is all different on my car and from what the previous owner told me. Quote Link to comment Share on other sites More sharing options...
BoostedStroker Posted March 28, 2015 Author Report Share Posted March 28, 2015 Put the manual boost controller on it today, have it set at 12 psi and the car pulls and runs great so i am guessing he did the ECU upgrade or the fuel would cut off? Quote Link to comment Share on other sites More sharing options...
BoostedStroker Posted April 1, 2015 Author Report Share Posted April 1, 2015 bump trying to figure out if 12 psi is the max i should be running or if i can go anymore? I know the 88-89 conquests run at 10.5 stock so 12 psi seems kinda low... Quote Link to comment Share on other sites More sharing options...
psu_Crash Posted April 2, 2015 Report Share Posted April 2, 2015 Do you have another car to drive when something goes wrong? If the answer is NO then leave the boost where it is Quote Link to comment Share on other sites More sharing options...
BoostedStroker Posted April 2, 2015 Author Report Share Posted April 2, 2015 Do you have another car to drive when something goes wrong?If the answer is NO then leave the boost where it is Sure do, i am not new to the idea of breaking things by bumping up the boost. I have a 97 F250 7.3 powerstroke running at 45 psi on a stock turbo making 400-425ish rwhp, but to use that as a example... The stock turbo is SAFE to run 35-40psi on for short periods of time, where it sees 18-20 psi stock. As long as the turbo is good shape and your not beating the crap out of it you can make a turbo last at 35-40 psi. I am a diesel tech. so parden my ignorance lol Is 14-15 psi SAFE to run on a stock turbo conquest? The motor has 15k on it, trans. is a year and a half old, turbo is in good shape and as stated supporting mods have been done. I dont know what the "norm" is to run for the max boost on these stock turbos hence why i am asking. Have others run a stock turbo at 14-15psi and have it live long if there not beating the crap out of it? Quote Link to comment Share on other sites More sharing options...
scott87star Posted April 2, 2015 Report Share Posted April 2, 2015 No, 14-15 is not safe, the problem is the stock turbine size limits airflow and when you add more compressor (boost) pressure the TIP or Turbine Inlet Pressure rises exponentially so you're getting 3X or 4X boost pressure in your exhaust manifold. Huge heat load + no air flow + too much ignition timing= headgasket fail (or worse). So turning up the boost pressure gives a little more air flow up until you reach your max setting, then the flow is actually dropping as rpm's rise. Peak torque goes up, peak HP goes down, engine fails. The factory distributor only has 7 degrees of ignition retard for boost. If you want more actual power you need to open up the turbine and get a standalone ECU where you have full ignition control. Quote Link to comment Share on other sites More sharing options...
Starfighterpilot Posted April 16, 2015 Report Share Posted April 16, 2015 I'd say that the MAX boost that you can safely run is using the Starquest Mitsu OEM 12A turbo is 12 PSI. I've been running that for years with no problems. Great write up above Scott. For What It's Worth. KEN Quote Link to comment Share on other sites More sharing options...
importwarrior Posted April 16, 2015 Report Share Posted April 16, 2015 Here is a good write up on how to mod the exhaust manifold. http://www.starquestclub.com/forum/index.php?showtopic=143496 Quote Link to comment Share on other sites More sharing options...
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