Topic: LNF Turbo Restrictor Installation and Proper Wastegate Adjustment

[cdnite]

I have Wester's Garage Tune (which I LOVE!!!) and while looking at their site to day I noticed this:

http://westersgarage.eidnet.org/LNF_Turbo_Restrictor.pdf

Has any one here done this mod? Is this a mod I should do? If so where can I find the restrictor it mentions?

Thanks for any help yall got!!

--Christian

[Go-N Def]

Don't get me wrong, I like Lyndon and all, but this concept reminds me of the IAT2 device that Dejon tried to sell a few years back.  I thought my engine was going to blow with all the knock I was getting.  Maybe this device is different...

[snaponbob]

This thing has been called a few different things, including "the pill". It is nothing more than a MIG welder tip that has been cut to a length of 3/16 to 1/4" and shoved into the hose. What it does is slow the turbo sensor's response to the increase in turbo output pressure. The result is that boost will increase much quicker when you hit the gas, and allow (momentary) high boost. The pressure change across the pill WILL equalize and the boost pressure will drop back to whatever it can produce at any give rpm and conditions. Go-N Def said he had a lot of knock, but others have had different results. In my case, I had NO audible knock EVER, but scanning the engine with HP Tuners software did reveal a few degrees of Knock Retard, and Lyndon altered the tune to eliminate it. For autocross it was certainly a benefit with 91 octane. With 100 octane it was TOO much power TOO suddenly which led me to remove it. For street driving it was entertaining but after a while it was a pain in the ass.

All that said, this was not Lyndon's idea, but he did post this information for those that wanted to do it. He doesn't make a dime on it.  Bottom line, it's cheap to do, results vary, and it's reversible. If you do this, it's a bit of a fiddly project that requires a bit of mechanical ability along with a proper tool for those hose clamps.

HTH.

[Go-N Def]

I meant that I had knock with Dejon's IAT2.  I've never tried Lyndon's device....

[snaponbob]

I meant that I had knock with Dejon's IAT2.  I've never tried Lyndon's device....

Oh. I don't bother with Dejon. 

[Go-N Def]

Me neither...  After that!

[kennysabarese]

I wouldn't touch this if I were you.

[shabby]

I tried this before, results were awesome, but then we got boost control in hptuners so i took it out.

[Carbon Sky]

I tried this before, results were awesome, but then we got boost control in hptuners so i took it out.

Same.  Pre-HPTuners, the pill mod and the bypass valve mod, and the wastegate rod tightening all felt like they kept the turbo spinning faster at lower throttle inputs.  You could hear the wastegate was busier, opening and closing more often.  But then once I got HPTuners and started tuning, it created inconsistencies, and more KR as I would roll onto the throttle.  Since I've been tuning with HPTuners, I get more consistently higher VE airflow numbers, and less KR, with everything stock mechanically (the wastegate may be a hair tighter, I basically set it to have no pre-load but not a sliver more/less) . . . go figure.  Just my theory, take it for what it's worth, but I think the ECU and wastegate are trying to do what you're telling it to do their job, but can't at that point because you've disconnected/defeated them, and altered the mechanical parameters.

[1LILNDN]

So do you get this restrictor from Lyndon or just buy the  M/W tip and cut it down yourself ? It says 23-40 is that the Orifice size so about 1/2 would = about a 30-31 ?   

[Carbon Sky]

Oh, and I forgot to add.  Unless you get a tune, whatever slight gains you might see initially will eventually be untuned out again as the computer learns the new parameters it's facing.  Basically the ECU turns the throttle signal into a desired air load or torque, which ultimately determines how much power the engine will make.  As it starts noticing and learning, it seems to be sucking in more air then it wants to, it will learn that and then won't open the throttle as much as it used to given the same conditions and throttle position.

You can just use the MIG welding tips as is.  But start with a very large opening at first, and go smaller and smaller, until you get what you're looking for.  I however want to be clear, I by no means take any responsibility for anything you do obviously.  In fact, I recommend against this entirely.  This kinda thing was good back in the day when turbos were controlled mechanically.  But with all the computer controlled factors on the LNF, you're asking for trouble.  I tried it out, realized it wasn't working, and went away from it again.

Do you have a way to datalog when you are doing this?  It'd be cheap relatively cheap insurance compared to a blown engine.