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Re: Wanna hear what boost can do?
[Re: BobR]
#677016
04/23/10 09:04 PM
04/23/10 09:04 PM
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Joined: Jan 2003
Posts: 3,336
Summit, NJ
whiplash
master
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master
Joined: Jan 2003
Posts: 3,336
Summit, NJ
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Quote:
Quote:
Well, get us all excited will ya! 
Last time I had my Challenger to the track it ran a best of 13.9 @ 100 with an old stock 1968 375 horse 440 with headers and a 750 Holley.
I wonder what I'll pick up with a few PSI thrown at it? 
Rule of thumb is approx 30 hp per boost pound.
Is that for centrifugals as well? I'm getting 12 psi intercooled, does that really equate to 360 hp? seems high to me.
- 67 coronet 4dr, 383/727/GVOD, blown, EFI, daily driver
- 230/238, 114°LSA cam, 1.6 rollers, 9:1 comp, 8 psi boost
- NEW BEST ET - 12.40@110mph...
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Re: Wanna hear what boost can do?
[Re: whiplash]
#677018
04/24/10 02:39 AM
04/24/10 02:39 AM
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Joined: Jan 2003
Posts: 2,697
Renton Wa
topfueldart
master
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master
Joined: Jan 2003
Posts: 2,697
Renton Wa
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Quote:
Quote:
Rule of thumb is approx 30 hp per boost pound.
Is that for centrifugals as well? I'm getting 12 psi intercooled, does that really equate to 360 hp? seems high to me.
I agree, that's high in my case as well. It is entirely based on the top-end of the motor. My heads are extremely restrictive, and boost is nothing but A MEASURE OF RESTRICTION. A 500 horse NA motor with good heads is going to respond to boost alot better than a stocker type combo.
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: Wanna hear what boost can do?
[Re: topfueldart]
#677019
04/24/10 09:48 AM
04/24/10 09:48 AM
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Joined: Oct 2006
Posts: 365
Motor City
Shaker223
enthusiast
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enthusiast
Joined: Oct 2006
Posts: 365
Motor City
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Quote:
My combination is basically the same, except in mopar land. Its a 318 with stock small valve heads, a 467/494 Crane Cam, Air Gap and 650 DP. 3.54 gear, and 28 inch tire in a 3350 lb plus me and junk in the trunk makes it 3550 raceweight, 68 Dart. The heads are a major restriction, but on 13 lbs the car just went 11.48 @ 120 on pump gas with water/meth. Without boost, im sure it would be a mid 14 second car.
Except I built the kit, didnt buy it.
I wanted to show what could be done with a cheap motor, im willing to bet an edelbrock head swap would be worth 100 horse, easy.
Same experience here....you all know how fast a stock slant 6 is. Put about 30psi into it and it reponds very well! 11.77 @ 116....That was at 3500lbs. Best mph was just short of 118. That's almost 450 at the crank.
Talk about restriction...the stock head flows around 120cfm on the intake and 90 on the exhaust. The stock rockers are about a 1.39 ratio and the cam lift at the valve is around .365 lift.
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Re: Wanna hear what boost can do?
[Re: rabid scott]
#677020
04/25/10 05:30 PM
04/25/10 05:30 PM
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Joined: Dec 2003
Posts: 1,325
Orlando Fl
Dos Snails
pro stock
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pro stock
Joined: Dec 2003
Posts: 1,325
Orlando Fl
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Quote:
Well, get us all excited will ya!
Last time I had my Challenger to the track it ran a best of 13.9 @ 100 with an old stock 1968 375 horse 440 with headers and a 750 Holley.
I wonder what I'll pick up with a few PSI thrown at it?
Case in point, I went 13.88 @ 98 on 13 lbs with a 4 cylinder Spirit R/T! ( OH yea, 3400 lbs with me in it!)
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Re: Wanna hear what boost can do?
[Re: topfueldart]
#677021
04/25/10 06:49 PM
04/25/10 06:49 PM
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Joined: Apr 2005
Posts: 60
Tolstoy, SD
turbo66valiant
member
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member
Joined: Apr 2005
Posts: 60
Tolstoy, SD
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Quote:
My combination is basically the same, except in mopar land. Its a 318 with stock small valve heads, a 467/494 Crane Cam, Air Gap and 650 DP. 3.54 gear, and 28 inch tire in a 3350 lb plus me and junk in the trunk makes it 3550 raceweight, 68 Dart. The heads are a major restriction, but on 13 lbs the car just went 11.48 @ 120 on pump gas with water/meth. Without boost, im sure it would be a mid 14 second car.
Except I built the kit, didnt buy it.
I wanted to show what could be done with a cheap motor, im willing to bet an edelbrock head swap would be worth 100 horse, easy.
We went 11.04 @ 124 with basically the same car and 318 but .512 roller, Edelbrocks w/ 8 psi boost and 575 Demon. Heads do make a diff!
Later
Ryan
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Re: Wanna hear what boost can do?
[Re: Duner]
#677024
04/29/10 06:33 AM
04/29/10 06:33 AM
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Joined: Mar 2010
Posts: 66
SRQ, FL
8valves
member
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member
Joined: Mar 2010
Posts: 66
SRQ, FL
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It should be stated that the curve of each individual setup for power/PSI is also based upon the actual setup. It is NOT constant.
At the end of the day XXX amount of CFM ends up producing XXX amount of power. What your engine can actually swallow at once will give you the boost it has to run to make said power.
Duner, as much as I like your vehicles, I must say, I'd be blown away (no pun intended) if you raised boost 1 psi and picked up another 68 HP. That's about 20 HP more per PSI than a well designed and optimized system on DOHC 300 or so CID motors that make 400 HP stock and over 1000 HP boosted that I deal with regularly.
Just for reference.
Aaron M
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Re: Wanna hear what boost can do?
[Re: 8valves]
#677027
04/29/10 11:31 PM
04/29/10 11:31 PM
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Joined: Nov 2003
Posts: 1,969
Chandler, AZ
Duner
top fuel
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top fuel
Joined: Nov 2003
Posts: 1,969
Chandler, AZ
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Quote:
It should be stated that the curve of each individual setup for power/PSI is also based upon the actual setup. It is NOT constant.
At the end of the day XXX amount of CFM ends up producing XXX amount of power. What your engine can actually swallow at once will give you the boost it has to run to make said power.
Duner, as much as I like your vehicles, I must say, I'd be blown away (no pun intended) if you raised boost 1 psi and picked up another 68 HP. That's about 20 HP more per PSI than a well designed and optimized system on DOHC 300 or so CID motors that make 400 HP stock and over 1000 HP boosted that I deal with regularly.
Just for reference.
I got to thinking about the differences. I don't know what "optimized for boost" would be, but I sure have a bunch of time in my home-brewed port job! LOL
According to my math, the change to better flowing heads basically took my NA numbers from 303 hp to 407 hp - and then you just multiply times the boost number from there. So the question is: Should the hp per # of boost be total? or just what it added? Because if you subtract the NA numbers out of the total hp produced, that's what the boost actually did..... or is that not the way to think of it?
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Re: Wanna hear what boost can do?
[Re: Duner]
#677028
04/30/10 04:57 AM
04/30/10 04:57 AM
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Joined: Jan 2003
Posts: 2,697
Renton Wa
topfueldart
master
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master
Joined: Jan 2003
Posts: 2,697
Renton Wa
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Just what it added. Thats why the 68 number was so wrong.
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: Wanna hear what boost can do?
[Re: topfueldart]
#677029
04/30/10 09:03 AM
04/30/10 09:03 AM
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Joined: Nov 2003
Posts: 1,969
Chandler, AZ
Duner
top fuel
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top fuel
Joined: Nov 2003
Posts: 1,969
Chandler, AZ
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Quote:
Just what it added. Thats why the 68 number was so wrong.
Oh, OK. Then it should be more like 27.7 hp gained per lb of boost in my current configuration. That makes more sense anyway.
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Re: Wanna hear what boost can do?
[Re: 8valves]
#677030
05/01/10 06:19 AM
05/01/10 06:19 AM
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Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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Quote:
Because there is no "rule of thumb" for power/psi. All applications vary.
Yes.
I can vouch for the 2.2 / 2.5 engines, depending on the setup 10 to 20 hp per pound of boost is normal.
The 8 valve heads flow pretty poor and turbine and intercooler restrictions play their parts as well.
Gary
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Re: Wanna hear what boost can do?
[Re: gdonovan]
#677031
05/01/10 02:16 PM
05/01/10 02:16 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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my car runs 6.2s in the 1/8th
493 with around 720hp
i just ported a set of ls1 heads for my friend that put a tiny turbo on his car. he went 6.38 the second time out with no tuning.
I'm pissed! he has $1500 in the motor and $2500 in the turbo and fuel system.
for the past week i'm really starting to think about building a low dough new hemi with twin turbos. i have very knowledgable friends that do turbo stuff and i'm thinking very hard about it now.
another factor is, if i ever wanted to go faster with a bb i need a block. thats atleast 3k right there
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Wanna hear what boost can do?
[Re: sixpackgut]
#677032
05/01/10 03:28 PM
05/01/10 03:28 PM
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Joined: Jan 2003
Posts: 2,697
Renton Wa
topfueldart
master
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master
Joined: Jan 2003
Posts: 2,697
Renton Wa
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Whoever says there is no replacement for displacement, has never ridden in a fast blown/turbo car!!
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: Wanna hear what boost can do?
[Re: topfueldart]
#677033
05/01/10 04:54 PM
05/01/10 04:54 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Whoever says there is no replacement for displacement, has never ridden in a fast blown/turbo car!!
ummm yeah but do the same thing to a bigger motor and get BIGGER results.
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Re: Wanna hear what boost can do?
[Re: Mr.Yuck]
#677034
05/01/10 05:48 PM
05/01/10 05:48 PM
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Joined: Dec 2003
Posts: 1,325
Orlando Fl
Dos Snails
pro stock
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pro stock
Joined: Dec 2003
Posts: 1,325
Orlando Fl
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Quote:
Quote:
Whoever says there is no replacement for displacement, has never ridden in a fast blown/turbo car!!
ummm yeah but do the same thing to a bigger motor and get BIGGER results.
Yea but I get 30 mpg off boost . 
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