Re: Turbo Question
[Re: Duner]
#1571517
01/31/14 03:17 PM
01/31/14 03:17 PM
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Joined: Feb 2003
Posts: 4,953 Houston, Texas
TheOtherDodge
master
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master
Joined: Feb 2003
Posts: 4,953
Houston, Texas
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"My T76 has a T4 hot side of a .96 A/R and I believe it's actually strangling it in the upper rpms." I have that issue also as evident in my relatively low MPH. I checked my logs and with an A to A intercooler I am hitting about 150 degrees with ambient around 70. Thanks for the info Duner!
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Re: Turbo Question
[Re: 67_Satellite]
#1571521
01/31/14 06:57 PM
01/31/14 06:57 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:
Thats the same one i run on my 383.Fully spooled to 15 lbs at 3500 r.p.m. Max power at 5000/5200 r.p.m,shift at5500,121 m.p.h quarter
Are you referring to the GT45 and is it a single turbo
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Re: Turbo Question
[Re: MR_P_BODY]
#1571522
02/01/14 09:58 AM
02/01/14 09:58 AM
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Joined: Jan 2003
Posts: 1,022 Andrews,In. U.S.of A.
67_Satellite
super stock
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super stock
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Posts: 1,022
Andrews,In. U.S.of A.
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Yup,straight off ebay.Single.Going to get a second one for the 470 under construction.Two of them @15 lbs &6500 r.p.m. on a 470,the plotline runs right across the center of the island.
Last edited by 67_Satellite; 02/01/14 12:43 PM.
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Re: Turbo Question
[Re: MR_P_BODY]
#1571523
02/01/14 12:42 PM
02/01/14 12:42 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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Milwaukee WI
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Quote:
Next question is on the A/R... the one I said lays it nice on the island is the 62-1 trim.. now in a lot of the specs it shows like a A/R .60 and a A/R 1.15 on the turbine side...but yet I cant find a map of this on that site to see how it lays up
You will never see an exhaust side map. to many variables. Timing, a/f ratio, fuel type, compressor to engine match, temps, shaft speeds,etc... My advice is start with the largest turbine wheel that the compressor will handle, and the smallest tangential housing that will fit that wheel. You can always step up the turbine hsg, or machine a bit of slot out of it to knock back the drive pressure. A compressor side that is to small can also drive the exhaust pressures to high. Even with big turbine wheels. When shaft speeds go to high(small compressor) the turbine wheel has the same effect as the compressor wheel. Centif force starts raising ex side pressures "artificially". Logging exhaust/ intake pressures teaches you alot.
"use it 'till it breaks, replace as needed"
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Re: Turbo Question
[Re: TRENDZ]
#1571524
02/01/14 01:10 PM
02/01/14 01:10 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
Quote:
Next question is on the A/R... the one I said lays it nice on the island is the 62-1 trim.. now in a lot of the specs it shows like a A/R .60 and a A/R 1.15 on the turbine side...but yet I cant find a map of this on that site to see how it lays up
You will never see an exhaust side map. to many variables. Timing, a/f ratio, fuel type, compressor to engine match, temps, shaft speeds,etc... My advice is start with the largest turbine wheel that the compressor will handle, and the smallest tangential housing that will fit that wheel. You can always step up the turbine hsg, or machine a bit of slot out of it to knock back the drive pressure. A compressor side that is to small can also drive the exhaust pressures to high. Even with big turbine wheels. When shaft speeds go to high(small compressor) the turbine wheel has the same effect as the compressor wheel. Centif force starts raising ex side pressures "artificially". Logging exhaust/ intake pressures teaches you alot.
Whats the difference between the A/R62-1 and the A/R .60 with A/R 1.15 on the turbine side... would this work for me
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Re: Turbo Question
[Re: MR_P_BODY]
#1571525
02/01/14 02:16 PM
02/01/14 02:16 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
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Milwaukee WI
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I'm a little confused with that question. Let me start by saying that turbo nomenclature differs from manufacturer to manufacturer. Then, throw in vendors making thier own names/ numbers. I'm guessing that you are asking me about a "61-1" turbo. I'm also guessing that the compressor wheel is designating the "name" Pay no attention to the compressor Area/Radius. Manufacturers wont machine an incorrect housing to fit a wheel, so pick the correct compressor wheel for your power/pressure ratio, and just accept thst the compressor housing will be best one for that particular wheel. It's a pretty good bet that this turbo has a "p" trim wheel, though I would confirm this with the seller. P trims will easilly take you to 800hp. I would start with small (low Area/Radius) turbine housings. Depending on the seller, some will let you trade turbine hsgs within a short period after sale, assuming you dont damage them. I would not start out with a 1.15 with twins on this engine, but at worst it will just be a touch lazy coming into boost. It just depends on what kind of boost hit you want. Smaller turbine A/R=quicker influx of boost with less top end power, and vice-versa. Will they work? Sure. will they be optimum? Maybe. Will they not work? No.
"use it 'till it breaks, replace as needed"
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Re: Turbo Question
[Re: TRENDZ]
#1571526
02/01/14 02:51 PM
02/01/14 02:51 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
OP
Master
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OP
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Quote:
I'm a little confused with that question. Let me start by saying that turbo nomenclature differs from manufacturer to manufacturer. Then, throw in vendors making thier own names/ numbers. I'm guessing that you are asking me about a "61-1" turbo. I'm also guessing that the compressor wheel is designating the "name" Pay no attention to the compressor Area/Radius. Manufacturers wont machine an incorrect housing to fit a wheel, so pick the correct compressor wheel for your power/pressure ratio, and just accept thst the compressor housing will be best one for that particular wheel. It's a pretty good bet that this turbo has a "p" trim wheel, though I would confirm this with the seller. P trims will easilly take you to 800hp. I would start with small (low Area/Radius) turbine housings. Depending on the seller, some will let you trade turbine hsgs within a short period after sale, assuming you dont damage them. I would not start out with a 1.15 with twins on this engine, but at worst it will just be a touch lazy coming into boost. It just depends on what kind of boost hit you want. Smaller turbine A/R=quicker influx of boost with less top end power, and vice-versa. Will they work? Sure. will they be optimum? Maybe. Will they not work? No.
Thats the whole thing... its hard to compare one to another if they use different numbers.. sure wish they had to all play on one standard ... you get some that use numbers then someone has to throw a "P" into the game... I dont want it to come on too low... would like to cruise at little to zero boost but then bring it in for the upper rpm power(I know I'm asking quite a bit)... that 62-1 would be about perfect but its hard to find that actual one(if you can)
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Re: Turbo Question
[Re: dizuster]
#1571529
02/01/14 07:36 PM
02/01/14 07:36 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
Also... if you're only trying to make such little power increase, why bother with the intercoolers? That boost range (<10psi)will easily run on regular pump gas. Especially with a carb.
2 reasons Scott.. I have the inter coolers already and I figured the more you cool the inlet air then there is less chance of detonation and would be easier to run pump gas
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Re: Turbo Question
[Re: dizuster]
#1571531
02/02/14 01:24 AM
02/02/14 01:24 AM
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Joined: Jan 2003
Posts: 2,697 Renton Wa
topfueldart
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Renton Wa
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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.
11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.
9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.
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Re: Turbo Question
[Re: topfueldart]
#1571532
02/02/14 01:21 PM
02/02/14 01:21 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
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
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Re: Turbo Question
[Re: Duner]
#1571534
02/02/14 01:31 PM
02/02/14 01:31 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
I bet that will work just fine!
Hope so.. but thats what I'm gonna try
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Re: Turbo Question
[Re: MR_P_BODY]
#1571536
02/02/14 05:48 PM
02/02/14 05:48 PM
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Joined: Jan 2003
Posts: 2,697 Renton Wa
topfueldart
master
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Quote:
Quote:
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.
11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.
9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.
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