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Re: Turbo Question
[Re: topfueldart]
#1571537
02/02/14 05:59 PM
02/02/14 05:59 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
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Posts: 52,972
Romeo MI
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Quote:
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I agree with a lot that's been said already. Compressor A/R is a useless measurement for our purposes, but turbine A/R is very important. Trim is also a term rarely used, just look at the compressor wheel measurement.
On 418 inches, the twin 1.05 turbines might be a bit laggy, but they will work. Don't be afraid to look at build threads of Chevy and Ford combos online, similarly sized engines will offer good info about the spool characteristics of a pair of those turbos.
Looks like I'm gonna try a 60 and a .96
A as in 1? or still twins? I think twin 60/61/67's, would work very well with .96 turbines.
Twins.... as in 2... so you believe I'm headed in
the right direction
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Re: Turbo Question
[Re: topfueldart]
#1571538
02/03/14 03:12 PM
02/03/14 03:12 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Next Question... is there really any difference between the inlets of the turbine... one rectangular hole or 2 smaller ones... does it help or hurt either way Thanks
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Re: Turbo Question
[Re: MR_P_BODY]
#1571539
02/03/14 03:34 PM
02/03/14 03:34 PM
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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Divided housings are designed for split manifold diesel aplications. They flow less than an open version of the same a/r, and are usaully cast of a lower nickel content iron. I would pass on these, but I personally have used them. They did end up cracking around the flange inlets, But I was "heat stacking" them, so other's results may vary...
"use it 'till it breaks, replace as needed"
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Re: Turbo Question
[Re: TRENDZ]
#1571540
02/03/14 04:03 PM
02/03/14 04:03 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Quote:
Divided housings are designed for split manifold diesel aplications. They flow less than an open version of the same a/r, and are usaully cast of a lower nickel content iron. I would pass on these, but I personally have used them. They did end up cracking around the flange inlets, But I was "heat stacking" them, so other's results may vary...
Thanks... good to know... so I'll be looking for the
larger single opening style
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Re: Turbo Question
[Re: MR_P_BODY]
#1571543
02/07/14 02:38 PM
02/07/14 02:38 PM
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Joined: May 2003
Posts: 6,563
Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,563
Downtown Roebuck Ont
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I think what he was saying is that with E85 or methanol, an intercooler isn't as much of a gotta have at the boost levels that most mere mortals can afford.  With a blow-thru setup the alcohol vaporizing cools down the charge. I'm sure you have seen NA alcohol cars at the track with frost on the intake even on the hottest days. Highschool physics was a lifetime ago but I think the principal was called "latent heat of evaporisation" or some such. If you are running gas as your main go to fuel the intercoolers are pretty much gotta have if you are planning on more than single digit boost levels. Kevin
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Re: Turbo Question
[Re: Twostick]
#1571544
02/07/14 02:46 PM
02/07/14 02:46 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Quote:
I think what he was saying is that with E85 or methanol, an intercooler isn't as much of a gotta have at the boost levels that most mere mortals can afford.
With a blow-thru setup the alcohol vaporizing cools down the charge. I'm sure you have seen NA alcohol cars at the track with frost on the intake even on the hottest days. Highschool physics was a lifetime ago but I think the principal was called "latent heat of evaporisation" or some such.
If you are running gas as your main go to fuel the intercoolers are pretty much gotta have if you are planning on more than single digit boost levels.
Kevin
Being this will be my Drag Week car I cant plan on
E-85(no such animal in parts of the country) so my
plan is regular pump fuel... would like to run 87
but race on 93 octane... that will require some testing
to see what pressure I can get away with on the 93
so the inter cooler are a must(in my opinion).. which
I have a couple... its not like I have to spend money
on them
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Re: Turbo Question
[Re: Quicksilver440]
#1571546
02/07/14 03:33 PM
02/07/14 03:33 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Quote:
Not that I really know anything about this stuff...but you could even consider running the intercooler AND an Alcohol Injection setup while racing....
I may end up using a meth/water injection set up but
if I can get away with out it I would prefer not using it...
I still like the KISS ways of doing it... once I get
this build up and running I'll test to see what I
can get away with
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Re: Turbo Question
[Re: TRENDZ]
#1571548
02/07/14 04:02 PM
02/07/14 04:02 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Quote:
You can get away with alot more if you run a cam with longer duration than most "turbo cams". You get a proportional egr effect with rising boost/ backpressure levels. Trust me , this works. you will be able to run any pump swill along the way. 
I assume due to closing the valve a bit later
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