Shim Wastegate? From Articles Endorsing Royal Purple Lubricants

[supreamS14]

Shim Wastegate? I found this in Articles Endorsing Royal Purple Lubricantshttp://www.royalpurple.com/drag-sport-p2.htmlYou might want to look at all 3 pages!Any boddy shim the wastegate?From RP: Shim Wastegate Cost: $0.00 to $0.40Average Horsepower Improvement: 0 to 15 horsepowerOur SR20DET Results (@ peak): + 1.5 horsepower / + 7.9 lb-ft of torqueMore boost, more power. Small increases in boost pressure will generally allow more power to be produced. On actuator-type wastegate turbo systems, increasing the tension on the wastegate actuator rod can increase low-rpm boost pressure by delaying the opening of the wastegate.No-Cost SolutionSix washers that we found in our scrap box were bolted between the actuator and the mounting pad.Our Dyno ExperienceBelow 400 rpm, this mod picked up five to eight horsepower. At peak power the mod was only worth an additional 1.5 horsepower.

[boro drift]

I shimmed the wastgate on my Supra, the response you gain is awsome. Since the wastgate is closed for that much longer, boost comes that much quicker.

[exhsturbine]

so you just shim the wastegate further away from the exhaust housing? keeping it closed longer? makes a certain amount of sense if i understand it correctly ill do it and see what happens

[supreamS14]

I already start making boost @ 1400 rpm in 2nd, 3rd, 4th and 5th with my GT28r, but I think I'm gonna try this. 1st I cant tell (All eyes on the road).

About how thick were the washers you used to shim your supra turbo?

[boro drift]

I used non-hardened washers which are thin, I have two on there now. Boost is supposed to be 7psi, it gets there twice as fast, and under heavy load, I get 9psi. No boost controler.

[exhsturbine]

can you give a ball park of how much sooner it began to build boost?

[boro drift]

I haven't payed attention rpm wise, but the needle on my boost gauge moves twice as fast. You will feel the power come on sooner, its night and day.

[supreamS14]

I haven't payed attention rpm wise, but the needle on my boost gauge moves twice as fast. You will feel the power come on sooner, its night and day.

I just shimed my wastegate with 2 exhaust washers. 1 for each mount bolt. The boost does seem twice as fast!

[kentuckyslider]

Somebody post a pic.

[Emperor_Tha]

so would a hks actuator benifit from it? It's on it's tightest setting (10psi) to fit on the turbo

[supreamS14]

I put the washers between the waste-gate mount and the turbo making the waste-gate tighter. I sometime feel like the waste-gate can break from putting too much tension on it. But it does work and I have an extra waste-gate if it does break.

[duffman1278]

OO WOW!! I'm gonna do this this weekend. Seems too simple.

[supreamS14]

I thought it would be very easy too but it took me like an hour. I kept dropping the washer. Then, I used a magnet rod to hold it in place.

[nzmoman]

and the results?^^^

[duffman1278]

Yea, results? Can someone clarify this for me though? All it is, is to put a washer on the bolts the hold the actuator onto the turbo? This allows the waste gate to create a bit more tension?

[lbkidsr20]

does anyone have good picks of what it looks like shimed with spacers? lol

[schanne]

^^^ What he said

[supreamS14]

Here's the pics of my gt28r shimmed wastegate. A little blurry. The exhaust manifold washers have red markings to help you see them.

[duffman1278]

So how were your results? Did you notice a difference?

[exhsturbine]

my engine is on the stand right now so i wasnt able to put it to use. but i did it to a t-25 i had sitting around. wish i would have taken pictures.... but anywaysi took off the outlet and looked at the wastegate "door" it seemed somewhat open, not much. and then i put the washers in, maybe 3/8ths thickness. and when i attached the rod, you kinda have to "stretch" it back on to the arm to wastegate door. but after that, i knew it wasnt open at all. it was tight (in the physical sense, not the lil' wayne and bow wow sense). i only wish i could actually use and see the difference.

[supreamS14]

So how were your results? Did you notice a difference?

I haven't payed attention rpm wise, but the needle on my boost gauge moves twice as fast. You will feel the power come on sooner, its night and day.

I just shimed my wastegate with 2 exhaust washers. 1 for each mount bolt. The boost does seem twice as fast!

Yes there is a difference!

[schanne]

Will it work with the T-25? With out problems?

[supreamS14]

On the RP site they use a t25. I use a GT28r so I coulden't say.

[Thoughtful_One]

The only reason they suggest this is that they are trying to make the point that a boost controller is a good investment to squeeze out more power.

if you check another article, they dyno the engine without an airfilter (yes, just an open MAF), to show that an air-filter is a good investment.

Sincce these engines are old, especially being exposed to high heatnig and cooling cycles, I wouldn't be surprised if that wastegate diaphram saw better days.

I'll be shimming in a few days and report back with details.

[kentuckyslider]

Just trying to tweak a few things on my SR over the winter and I thought about this thread. I have the universal GT2871 not the direct bolt on for the SR. I got to looking at it and the actuator is mounted on the other side of the compressor housing then the T25 and T28 oem turbos. Mine is shimmed with like 4 washers and that puts it closer to the turbine not farther away? I'll post a pic tomorrow.

[Koshin]

interesting....

[supreamS14]

The point is to add more tension, not give it slack.

[Thoughtful_One]

After doing some work on my car, I decided to try out the shimmed method temporarily.

I could really get one M10 washer in there since I didn't think there was enough thread to hold the wastegate on.

Took it for a spin, and boost climbed to around ~9 from about 6.5 PSI stock. On and off-throttle response is only a little better.

I did a WOT pull 1-4 th gear last night, and I was really surprised how quick it was. 1st was all wheelspin, 2nd was wheelspin past 5K, third and fourth to redline was pretty damn quick.

For some reaosn, my boost was just climbing though, leveling out at around 11 PSI.

You guys need to understand that a US swapped SR will be slow to respond without a boost controller or the factory soledoind wired in. Nissan added the wastegate solenoid for a reason, and running the wastegate directly to the hotpipe will never be as responsive as something to actuate the wastegate electronically.