How much whp with your Greddy 18g?

[totalazneclipse]

I was wondering how much whp people are making with their Greddy 18G and with what mods.

Yes, I know that not many people own or use the Greddy 18g because of their price but please try to stick to the topic. I went through 9 pages worth of topics to only find numerous people saying "its good up to 400hp" or something of that nature. I am just curious of what kind of power others are making so I can get an idea of what to expect.

And if you really want to know why I have this turbo, I got it used and it was a really good deal.

 

[dsm-onster]

The greddy 18g comes w/ a td05H turbine wheel. The td05H 18G with a 7 cm^2 tubine housing has been proven to flow enough air for over 450whp. RayPeters 18G setup.

From my experience, I feel the 18G compressor wheel would SIGNIFICANTLY benenfit from a larger turbine wheel or housing.

So if you max this turbo out later, think about modifying it first; before diving into a whole new turbo set up. Some changes include:

-- 8cm^2 turbine housing upgrade
-- 7-10-15 degree clip (less costly than another housingand probably more effective as upgrading housings)
-- TD06H turbine wheel (probably the most expensive, but the most efficient upgrade)


Changing the hotside may yield 50 or more horsepower.

 

[JayRolla]

From what Ive seen with 20g wheels in a td05 housing 400whp is about all you will get and that is pushing it. SB racing ran there super 20g as hard as they could and made only 420whp. Thats 20whp over the evo16g. At lower boost levels the 16g about the same.

The 18g is a little smaller so will have less problems with compressor surge. The 20g wheel is way to large for the td05 housing and causes major surge. 18g most likely dont have that problem. So your 400whp number is probably a good guess.

 

[Ceddy]

16G small 1.830 2.365
16G large 1.892 2.680
16G evo3 1.902 2.680
18G ------ 1.992 2.680
20G ------ 2.070 2.680

The 18g is only slightly larger than the 16g evo3 wheel.
A 18g with a TD05H turbine and 7cm2 housing is going to flow very similar to a Evo 3, maybe a little more.

 

[dsm-onster]

Yea, like 50 to 75 hp more. that's significant. Unless you have experience pushing the limits w/ that compressor wheel, you're speculating. The 20g compressor can flow nearly 150 hp more than the evo3 16G compressor. The only difference being the inducer diameter. The 18G has an inducer diameter closer to the size of a 20G than an evo3 16G, while having the same exducer diameter. Inducer diameter indicates flow. Exducer diameter indicates its efficiency at boost.

As stated, THIS 18g is good for a little over 400hp w/ that small td05H hotside. Considering a true 18g turbine comes w/ a td06h turbine and FP sells the 18g w/ a CLIPPED td05H turbine, the 18G compressor flows more than a run of the mill evo3 16g turbine and housing will allow.

totalazneclipse, you have a very efficient compressor. A simple $75 clip will yield EXCELLENT results when you begin to reach the 400hp mark and want to push it harder. The compressor has much more there, if you do.

To add to what JayRolla mentioned, running a td06H turbine wheel nulls surge w/ a 20g compressor wheel. And the run of the mill MHI 20g comes standard w/a td06H turbine wheel.