• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Turbo build and dyno numbers

  • Thread starter Thread starter Zinc2000GT
  • Start date Start date Jan 15, 2009
Prev
  • 1
  • 2
  • 3
First Prev 3 of 3

CobraRed_96_GT

Active Member
May 20, 2006
1,421
4
39
UCSD/La Jolla
Apr 9, 2009
#41
  • Apr 9, 2009
  • #41
Maxing 60's at 587, does that sound right?
A 60lb injector at 55psi should see 90% duty around 860-880 flywheel
at 43psi 700 flywheel.

What's your fuel pressure?
 

Dark_Horse

Member
Dec 29, 2006
83
0
6
Springfield, MO
Apr 9, 2009
#42
  • Apr 9, 2009
  • #42
CobraRed_96_GT said:
Maxing 60's at 587, does that sound right?
A 60lb injector at 55psi should see 90% duty around 860-880 flywheel
at 43psi 700 flywheel.

What's your fuel pressure?
Click to expand...



I was thinking the same thing. Seems like the numbers are a little low for the injectors to be maxed out ??
 
4

4tun8

New Member
May 1, 2006
172
0
0
Classified
Apr 9, 2009
#43
  • Apr 9, 2009
  • #43
What A/R backside on the 42r?
 
Z

Zinc2000GT

Founding Member
Aug 29, 2000
133
0
17
Phoenix, AZ
Apr 9, 2009
#44
  • Apr 9, 2009
  • #44
CobraRed_96_GT said:
Maxing 60's at 587, does that sound right?
A 60lb injector at 55psi should see 90% duty around 860-880 flywheel
at 43psi 700 flywheel.

What's your fuel pressure?
Click to expand...
Doesn't sound right to me either.

Finally was able to get some information out of them.

They have no idea what my fuel pump duty cycle or fuel pressure are, but the injector duty cycle was at 91%
 
Z

Zinc2000GT

Founding Member
Aug 29, 2000
133
0
17
Phoenix, AZ
Apr 9, 2009
#45
  • Apr 9, 2009
  • #45
4tun8 said:
What A/R backside on the 42r?
Click to expand...

1.01
 

CobraRed_96_GT

Active Member
May 20, 2006
1,421
4
39
UCSD/La Jolla
Apr 9, 2009
#46
  • Apr 9, 2009
  • #46
Zinc2000GT said:
Doesn't sound right to me either.

Finally was able to get some information out of them.

They have no idea what my fuel pump duty cycle or fuel pressure are, but the injector duty cycle was at 91%
Click to expand...
That just doesn't make sense. You must be low on fuel pressure, what's you fuel system look like? Although I'm mainly knowledgeable about return systems.

And with an 84mm over 1 A/R you should definitely be revving your engine to 6800+
 
Z

Zinc2000GT

Founding Member
Aug 29, 2000
133
0
17
Phoenix, AZ
Apr 9, 2009
#47
  • Apr 9, 2009
  • #47
CobraRed_96_GT said:
That just doesn't make sense. You must be low on fuel pressure, what's you fuel system look like? Although I'm mainly knowledgeable about return systems.

And with an 84mm over 1 A/R you should definitely be revving your engine to 6800+
Click to expand...
Fuel system consists of twin GT40 pumps in a fore hat with twin -6 outlets. -6 feeds into a Y and a single -8 line runs to the CPR Rails.

Fuel to the injectors shouldn't be an issue, not at this kind of power.

I was a bit surprised that power started dropping so early as well. With the heads, intake, and such a large turbine section i was expecting to be making power to 7k rpm.
 

lvmustanggt

New Member
Apr 9, 2006
721
0
0
Las Vegas
Apr 10, 2009
#48
  • Apr 10, 2009
  • #48
Great looking car and turbo. Off topic but I am going to install my single turbo this 14th and need your help. I need driver side breather and want to get just like yours. Is this the one

Ford Racing M-6766-H302 - Ford Racing Valve Cover Breathers
 
Z

Zinc2000GT

Founding Member
Aug 29, 2000
133
0
17
Phoenix, AZ
Apr 10, 2009
#49
  • Apr 10, 2009
  • #49
lvmustanggt said:
Great looking car and turbo. Off topic but I am going to install my single turbo this 14th and need your help. I need driver side breather and want to get just like yours. Is this the one

Ford Racing M-6766-H302 - Ford Racing Valve Cover Breathers
Click to expand...

Mine looks just like the one pictured, but it is only 2" in diameter.
 
4

4tun8

New Member
May 1, 2006
172
0
0
Classified
Apr 10, 2009
#50
  • Apr 10, 2009
  • #50
1.01 A/R I assume it's not a Garrett unit?
 
Z

Zinc2000GT

Founding Member
Aug 29, 2000
133
0
17
Phoenix, AZ
Apr 10, 2009
#51
  • Apr 10, 2009
  • #51
4tun8 said:
1.01 A/R I assume it's not a Garrett unit?
Click to expand...

No, it is a Garrett turbo.


 
4

4tun8

New Member
May 1, 2006
172
0
0
Classified
Apr 10, 2009
#52
  • Apr 10, 2009
  • #52
Man I must be crazy I could have sworn that the big 42r backside was a 1.02. I plan on putting a similar unit on my Evo (Scary). That turbo will make 800+ at the ground on my car. Currently building the motor (JE tough skirted pistons, Manley turbo tough I-beams, yes I splurged I-beams). 9.0:1 CR. I've pushed some pretty huge boost on other turbos (30+ psi) the 42r doesn't really even wake up at low boost levels.
 

lvmustanggt

New Member
Apr 9, 2006
721
0
0
Las Vegas
Apr 11, 2009
#53
  • Apr 11, 2009
  • #53
Zinc2000GT said:
Mine looks just like the one pictured, but it is only 2" in diameter.
Click to expand...

do you know model # of your or where did you buy it ?
 
Z

Zinc2000GT

Founding Member
Aug 29, 2000
133
0
17
Phoenix, AZ
Apr 11, 2009
#54
  • Apr 11, 2009
  • #54
4tun8 said:
Man I must be crazy I could have sworn that the big 42r backside was a 1.02. I plan on putting a similar unit on my Evo (Scary). That turbo will make 800+ at the ground on my car. Currently building the motor (JE tough skirted pistons, Manley turbo tough I-beams, yes I splurged I-beams). 9.0:1 CR. I've pushed some pretty huge boost on other turbos (30+ psi) the 42r doesn't really even wake up at low boost levels.
Click to expand...
Jesus. I can't imagine trying to fit a 42R in that engine bay. Should be interesting, and make an ton of power.

lvmustanggt said:
do you know model # of your or where did you buy it ?
Click to expand...
No, i'm sorry.



Got a little lucky yesterday.

I ran into the tuner at FAT (they built my car), so i was actually able to talk to him instead of through everyone else at PSR.

He said he's going to take a look at the datalog again to see what's going on. This way i can get some actual numbers. He said he'll also burn the dyno runs to a cd so i can have them. I also got some different numbers when i talked to him. He said he thinks, he couldn't remember exactly, that we're only running 11° of timing. And he said base fuel pressure is set at 39psi.

I'll be stopping by on Monday to talk to him when he has access to the datalog and my dyno runs to get some definite answers.

Also, he tuned the turbod cobra R at FAT and managed 740rwhp on 91 octane with the 80lb/hr injectors, only hitting 70% duty cycle.

So, i'm not sure what i'm going to be doing. Should i just move up to the 80lb/hr injectors and have him re-tune it and see if we can't pick up some more power or should i just have another shop take a look and see what's going on?
 
Prev
  • 1
  • 2
  • 3
First Prev 3 of 3
You must log in or register to reply here.

Similar threads

351w turbo build.... Turbo guys teach me things...
  • Kid wita 5oh
  • Oct 22, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
13
Views
1K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Oct 23, 2025
General karthief
Zero fuel pressure @ Shrader, but over 100 PSI at filter
  • Stang337
  • Jul 5, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
5
Views
396
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Aug 10, 2025
JD1964
N
Smoking problem 02 gt
  • Nightmare4.6
  • Oct 2, 2024
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
11
Views
774
1996 - 2004 SN95 Mustang -General/Talk- Oct 25, 2024
Manlaw213
M
B
2001 roush stage 3 - sat for 5 years
  • Brando_05
  • Aug 26, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
0
Views
260
1996 - 2004 SN95 Mustang -General/Talk- Aug 26, 2025
Brando_05
B
Place to Avoid: Jamison Auto Group in Gulfport, MS
  • D Durden
  • Oct 20, 2025
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • 2 3
Replies
46
Views
3K
1965 - 1973 Classic Mustangs -General/Talk- Jul 16, 2026
Noobz347
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?