BW GM-8 vs Holset HX-40 vs HX-35

[95AWD6Bolt]

I have been searching for a comparison for the past few hours and have not come up with any results.
I cannot seem to find any numbers on the Borg Warner GM-8

I am looking for the following:

1. horsepower range of the borg warner gm8 on a dsm
2. spool up time(full boost) for the bw gm8

 

[blizz99]

anyone? i want to know the same info

 

[whe3ls]

here is some info personly id go with the hx 40

I figured I'd bring this up since there is/was some confusion as to what the Borg Warner IHI RHC6 GM1-8 compares to when comparing any of them to a Garrett TO4B or TO4E.

The IHI RHC6 GM8 measures 2.756" major diameter and 1.968" minor diameter on the compressor wheel. There are NO minor diameters of TO4E that measure 1.968". The closest you would get would be the TO4E 40 trim which measures 1.870"...BUT..the major diameter is 2.950". A difference of a finger nail on each side...quite a difference in percentage and overall flow potential.

Now moving on to what is closest- The TO4B S which measures 2.750" major and 1.904" minor.

Here is the TO4B S which has a max choke flow of 37 lbs/min or roughly 17.7 m³/min which equates to roughly 625 CFM. Take the rules of 150 CFM per 100 hp and you'll see that the TO4B S is capable of enough flow for 300~500+ hp.



Now onto more facts courtesy of IHI. The closest current compressor map that you'll find is located here:



But this is for the latest series of IHI turbos which aren't ancient and weren't made in the 90's. The updated (ie current) version of the RHC6 family is the RHE61 which is the same frame, same size, same everything except 2000'ish rather than 90'ish.

Note that the airflow rate for the RHE61 is 3.3 m³/min - 17.7m³/min or 116.5- 618 CFM. Now that we've gotten that taken care of, we'll move onto the actual flow maps. Here is the entire updated family of IHI turbos:



Note that the RHE61 barely passes the 20m³/min mark and that spooling the turbo that fast would be the equivalent of trying to boost a VJ11 to 30 psi. As said, the choke flow is 17.5 m³/min.

What does this all mean? Why and I posting pictures of turbos that aren't the turbo in question? Glad you asked.

Here is the archaic RHB3-RHC9 compressor maps:



The RHC6 family tops out at 17.5 m³/min or 620 CFM.





As far as the turbine, the GM8 measures 2.420" major and 2.030" minor. GM3 appears to be somewhat larger on both the compressor and minor turbine wheel. GM3 measures 2.150" minor on the turbine wheel.

The measurement for the GM8 would be closest to a Garrett Stage 1 turbine which measures 2.319" major 1.918" minor.

Measurements for Garrett turbines are as follows:

Stage 1- 2.319" major, 1.918" minor
Stage 2- 2.559" major, 2.122" minor
Stage 3- 2.559" major, 2.229" minor
Stage 5- 2.798" major, 2.439" minor

N- 2.922" major, 2.071" minor
O- 2.922" major, 2.296" minor
P- 2.922" major, 2.544" minor
Q- 3.111" major, 2.693" minor

The GM1-8 has the same T3 footprint (inlet flange) so any T3 inlet flange will work.""

 

[blizz99]

so what would be the hp range for the gm-8?

 

[whe3ls]

its in my post

 

[dsm-onster]

http://www.dsmtuners.com/forums/newbie-forum/333520-bw-gm-8-turbo-6-5-chevy.html

 

[blizz99]

i was told that the turbo in question is compared to a 57 trim with .60 turbine and .70 compressor wheels

would this turbo spool as quick as a hx40 with a t3 setup?

 

[dsm-onster]

No one knows because no one has run this turbo around here.

 

[casperfast]

i have seen this turbo ran on an srt 4 which showed quite a bit of lag, full boost around 3800ish (26-30 psi) and put down about 400 hp. i have never seen one on a dsm though. i know the hx 35 and 40 are a good bet though.

 

[EGuenther]

If it flows roughly 37lbs/min you could get roughly 370hp, whe3ls's post states roughly 300-500hp.

 

[ziggo0]

i have seen this turbo ran on an srt 4 which showed quite a bit of lag, full boost around 3800ish (26-30 psi) and put down about 400 hp. i have never seen one on a dsm though. i know the hx 35 and 40 are a good bet though.

That's pretty terrible on the neon. A 50 trim would spool sooner and easily make more power.