Gettin it tuned tomorrow... What should I run for boost? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 20 Old 07-16-2009, 06:11 PM Thread Starter
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Gettin it tuned tomorrow... What should I run for boost?

I know its a noob question and that I could probably get by with running one tune with 10lbs and the other at 12lb on pump gas but I want to see what others have done and the power difference between the two.

My Combo:

1995 Cobra
Stock Intake, heads, cam, short block, head gaskets, computer
Cartech Street Sleeper Kit
Single T64 turbo w/ .96ar exhaust housing
2" coldside
A/A intercooler
PMAS 3" blow-thru MAF
255lph HP fuel pump
60lb injectors
2 1/2" downpipe to y-pipe to Pypes catback
Tial 38mm gate with 7 lb spring
hks blowoff
TurboSmart dual stage boost controller with high/low switch

Thats about it. I want to run only on pump gas and safely. The tuner is going to burn me two tunes on a flip chip. What would you guys recommend?

Thanks!


1995 Cobra white/tan and a T64
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post #2 of 20 Old 07-16-2009, 06:30 PM
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12-14 and let the tuner go from there


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post #3 of 20 Old 07-16-2009, 06:37 PM
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Put a timing light on it while it's on the dyno. You need to make sure what your asking for is what your getting. Those 94-95 cars can get into some timing drift.

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post #4 of 20 Old 07-16-2009, 06:48 PM
 
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Hey how does the car run without a tune with the PMAS MAF?
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post #5 of 20 Old 07-16-2009, 11:02 PM Thread Starter
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It will idle for about a minute after initial startup. Then it will hold at 1000rpm for a second and then die. The no egr doesnt help though.

I just dropped the car off and told him if he can do 14lb safely then I would like one at 10lbs and one at 14lbs. If not one, at 8lbs and one at 12lbs.

I want a noticeable difference between the two.

I'll let ya know how it goes!

1995 Cobra white/tan and a T64
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post #6 of 20 Old 07-17-2009, 07:03 AM
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I would be interested to know if you can feel the difference between 4 lbs.

"ITS LIKE A FINGER POINTING AWAY TO THE MOON"
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684 RWHP/ 645 TQ @ 13psi
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post #7 of 20 Old 07-17-2009, 08:19 AM
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4lbs is probably 60hp or more

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post #8 of 20 Old 07-17-2009, 08:44 AM Thread Starter
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60hp? I should definitely be able to notice that.

I just like the idea of being able to go to the track and lose to a car on the low boost and come back around and smoke em by flipping two switches.

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post #9 of 20 Old 07-17-2009, 10:36 AM
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Quote:
Originally Posted by 92stanggt5.0 View Post
60hp? I should definitely be able to notice that.

I just like the idea of being able to go to the track and lose to a car on the low boost and come back around and smoke em by flipping two switches.
14.7lbs of boost will double your N/A HP

So if NA you make 300 14.7 lbs of boost is = 300 hp

So 1lb of boost is = 20hp

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post #10 of 20 Old 07-17-2009, 10:54 AM Thread Starter
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I'm not disagreeing with ya. I just thought it would have been more around 10hp a pound of boost. I like the idea of it being 20hp a pound. But like you said it is all relative to what I was making N/A.

So... I would think I was at about 250rwhp N/A
14.7lbs would put me at about 500rwhp
So for me it would be about 18hp a pound
So a 4lb difference should be roughly 70hp
Not exact but gives me an idea

Those Slomaro's aint gonna know what hit em.


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post #11 of 20 Old 07-20-2009, 08:44 AM Thread Starter
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So got the car back on Friday and I've been havin a blast drivin it around.

@ 9lbs it made 367hp and 484ft-lbs at the wheels


@13lbs it made 413hp and 527ft-lbs at the wheels

I still need to work on a couple issues with it but overall I am extremely impressed with the power that it made and how well the car runs and everything else.

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post #12 of 20 Old 07-20-2009, 09:01 AM
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did the tune change or just the boost?

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post #13 of 20 Old 07-20-2009, 11:44 AM
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Quote:
Originally Posted by Rich Gill View Post
14.7lbs of boost will double your N/A HP

So if NA you make 300 14.7 lbs of boost is = 300 hp

So 1lb of boost is = 20hp
This isn't very good information. PSI is a meaningless number unless you know the flow characteristics of the compressor. It's completely false to say you will double your N/A HP at 14.7 boost. If the compressor flows the same amount of air at 14.7 that your engine takes in at WOT and peak HP RPM, then yeah, it'll double your power. If not, then no.

You can't estimate what the power difference will be unless you have a compressor map.
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post #14 of 20 Old 07-20-2009, 01:14 PM
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Did you get a dyno sheet with it or anything, not knocking you by ANY MEANS but your 9lbs seems fairly low to me. got a sheet to put up?
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post #15 of 20 Old 07-20-2009, 11:42 PM Thread Starter
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I do have a sheet. But alas, I forgot it at a friends house when showing it to some other car guys.

I think that I might be blowing out spark at high rpms. It seems to pull really strong from low-mid range in but high it kinda flattens out.

Right now I have two range colder Autolite race plugs gapped at .032
Should I go one range colder and gap less or just gap the ones that I have right now less?

I have a MSD Digi 6 and Jegs high-output coil with good wires and cap and rotor right now.

As for the tune yes and no. He said he tuned for 9lbs first and then tried it at 13lbs and tuned for that and then went back and retuned for the 9lbs. It is supposed to be safe. I haven't seen anything close to lean conditions at WOT at either boost level. So in short both tunes on one chip.

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post #16 of 20 Old 07-21-2009, 09:22 AM
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I would check to see if your chart shows your flattening out or getting some spikes or anything. Maybe try gapping a 28 or 30
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post #17 of 20 Old 07-21-2009, 11:35 AM
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Like stated every motor/combo is different when it comes to HP per PSI. On my setup from 5 psi to 15psi every lb was worth 35RWHP.
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post #18 of 20 Old 07-21-2009, 11:46 AM
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i would try autolite 23's gap them to .032 still
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post #19 of 20 Old 07-29-2009, 02:53 AM
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Quote:
Originally Posted by stangjumper View Post
Like stated every motor/combo is different when it comes to HP per PSI. On my setup from 5 psi to 15psi every lb was worth 35RWHP.


so your saying that those 10 psi on your setup was worth 350 rwhp......thats like 400-430 hp difference your saying with factors like tranny and slip? blah blah blah

wheres the dyno sheet ???
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post #20 of 20 Old 07-29-2009, 10:05 AM
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Quote:
Originally Posted by stangjumper
Like stated every motor/combo is different when it comes to HP per PSI. On my setup from 5 psi to 15psi every lb was worth 35RWHP.
Quote:
Originally Posted by jtmustang91 View Post
so your saying that those 10 psi on your setup was worth 350 rwhp......thats like 400-430 hp difference your saying with factors like tranny and slip? blah blah blah

wheres the dyno sheet ???


It doesn't work that way. PSI doesn't mean crap unless it's related to a specific turbo! It's just a number. AIRFLOW is what makes power, and airflow is NOT linear based on boost, it varies based on compressor size, A/R, temperature, etc. THAT is why you have to have a compressor map.
Now if you were to accept stangjumper's premise that he made 350 extra RWHP on 10 psi difference, using a drivetrain loss of 15%, that's about 412HP gain at the flywheel. Given that it takes 1lb of air to generate 10HP, his turbo at 15psi would have to be flowing 41.2lbs of air to make that power. That's not unheard of.
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