Boost Issues on Stock Internals

[D_Thissen]

It's not only the amount of psi, but how many cfm the turbo can push. 7psi on a gt28 is different than 7psi on a gt35.

[GsxrMe]

My tuner didnt recommend going over 10psi with either 93 or flex fuel on a stock block. Our rods are paper thin and tuning for tomuch lowend torque may also bend the factory rods.

Needless to say, save for a block right away so you dont need to make that call to AAA.

[Soloside]

ran a mix of 93 and e85 for 19k miles on 10lbs with greddy t620z. Lots of daily and spirited drivings with 0 track days.


no issues at all.

[cdrazic93]

Originally Posted by mcrane

- Since the FA20 is high compression, wouldn't boost just increase heat and cause the stock internals to wear faster?1

- I am aiming on 7 PSI. Is anyone running similar boost levels? If so, how many miles have you gone and have you had any major issues?2

I guess the overall question is "how reliable is the stock FA20 at around 7-8 psi?"3

- Thanks!

1. This motor does have high compression, yes. But due to the direct injection, the fuel spray cools down the charge allowing for such high compression, within reason.

2. 7 psi is relatively standard for boost on this engine, and alot of people have run 7-10 psi on pump or e85 and have done so for 10's of thousands of miles. Check build threads and owners threads for those kinds of anecdotes.

3. Pretty reliable. The one thing you should put emphasis on is the tune. The tune is the glue that will hold most of it together. Failsafes, boost cuts, ECBS, all those things can be incorperated into your tune assuming the proper hardware.

Reliability also falls down to quality of parts. Dont expect an ebay turbo to last just as long as a properly taken care of garrett or borg warner.