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  #1  
Old 11-01-2009, 01:00 AM
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Ham Shanker
 
Join Date: May 2008
Location: Baltimore, MD
Posts: 2,544
Picking a Turbo

I may be getting my hands on a second 617.952 driven vehicle for a project car. One car will become a decent w123, the other will be an almost-all-out performance car.

I'd like to stay variable vane (If it's cheap enough) what would you guys recommend for the performance car?

The DD will be getting my GT2056V, stealthy gauges, rack limiter removed. No performance mods beyond that.

If it all goes as planned(haha) the performance car will be getting the following:

Rack limiter removed
Torque control raised
25-30lbs boost
3" stack
1GPM/cylinder methanol&water
Lincoln-locked differential
Underdrive aluminum pulleys
No power steering
Electronic fan
On/off switch for the alternator

I want to show the local Cummins guys a thing or two....

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Old 11-01-2009, 01:14 AM
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Quote:
Originally Posted by Simpler=Better View Post
Rack limiter removed
Torque control raised
25-30lbs boost
That will only get you 145hp, less with such excessively high boost.

Quote:
1GPM/cylinder methanol&water
1GPM/cyl W/M is low. I was running 3GPM and it only gave a 2hp boost. If you want W/M for power, its a very poor $/hp deal. Its best used to keep EGTs under control.

Quote:
Lincoln-locked differential
Why? If you have trouble keeping traction with 200lb/ft of torque, its time for better tires!

Quote:
Underdrive aluminum pulleys
Pointless. With no P/S, no fan and the alternator field off, there will be no measurable gains.

Quote:
I want to show the local Cummins guys a thing or two....
You'd better look into shredator's 10mm MW or a Myna M first if you want to show them more than 145hp!

Last edited by Les Jenkins; 11-01-2009 at 01:24 AM.
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Old 11-01-2009, 07:15 PM
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Ham Shanker
 
Join Date: May 2008
Location: Baltimore, MD
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You were running 3GPM per cylinder (15GPM total) and only saw a 2hp gain?

I'm aware that supplying fuel will be a challenge. I'd prefer to get a big turbo plumbed in first, and then work on fueling to match.
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Old 11-01-2009, 07:27 PM
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Originally Posted by Simpler=Better View Post
You were running 3GPM per cylinder (15GPM total) and only saw a 2hp gain?
3gpm total. So even with 5gpm, you're looking at less than 5hp added with a 50/50 mix. The higher the ratio and the higher the flow rate, the higher the risk of detonation. Especially with MB's very high compression ratio.

If you want 25-30psi, you'll pretty much need at least a 71mm compressor which puts it into the GT3x turbo range. The 59 and 60mm wheels of the GT22, 23 and 25 can't push more than 25psi at the 617 airflow needs (~35lb/min@30psi@4500rpm).

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Old 11-02-2009, 10:18 PM
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Ham Shanker
 
Join Date: May 2008
Location: Baltimore, MD
Posts: 2,544
Thank you

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