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Discussion Starter · #1 ·
Hi Folks,

Just got back from the dyno shop where I dyno tuned our test car. The only mods over the last session are:

- 2lb lower pulley added
- Kooks/JDM 1-5/8" longtubes w/2.5" collectors and JDM H-pipe w/cats
- 50lb injectors (in preparation for nitrous)
- BR7EF spark plugs gapped at .033 (to cure massive spark blowout)

Here is the comparison between last time and this time (all numbers are SAE corrected):

Code:
RPM    Last HP     New HP    DeltaHP    Last TQ    New TQ     DeltaTQ
------------------------------------------------------------------------------------

2500   217.5       227.3     +9.8       456.9      477.5      +20.6
3000   271.3       293.8     +22.5      475.0      514.4      +39.4
[b]3300   302.6       327.5     +24.9      481.7      521.3      +39.6[/b]
4000   360.9       384.9     +24.0      473.9      505.3      +31.4
4500   401.7       424.4     +22.7      468.8      495.1      +26.3
5000   438.7       465.8     +27.1      460.9      489.3      +28.4
5500   464.9       482.4     +17.5      443.9      460.7      +16.8
6000   475.3       482.1     +6.8       416.0      422.0      +6.0
6500   451.4       477.9     +26.5      364.7      386.2      +21.5
1. Previous peak numbers: 475.3rwhp/481.9rwtq SAE 0.98
New peak numbers: 485.3rwhp/521.3rwtq SAE 0.97

2. The longtubes and addition of 2lb lower pulley added 10.0rwhp/39.4rwtq at peak but added excellent gains throughout the entire RPM range!

3. Switching from NGK TR-6 plugs gapped at 0.039 to NGK BR7EF plugs gapped at 0.033 fixed the bad spark blowout we had at 13psi.

4. Used the MAFterburner to handle the 39lb/hr to 50lb/hr injector calibration. Used the Afterburner-eFPC to retune the new combination to get roughly the same air/fuel ratio as previous session.

Here is the dyno graph:

Thoughts, comments, etc.?

MJ
 

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Yes...it can be done
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Holy torque gains Batman! I have the exact same exhaust setup coming. Good to see the positive results. I wonder what the effect of injectors are alone?
 

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The Ubiquitous Jimmy V.
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Nice tunning job. Congrats.
Must be a hoot to drive with all that TQE. :D


jim v.
 

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Discussion Starter · #4 ·
03Steve said:
Holy torque gains Batman! I have the exact same exhaust setup coming. Good to see the positive results. I wonder what the effect of injectors are alone?
Effect of injectors alone = ZERO. I tuned the setup to run the exact same air/fuel so I could make a fair comparison between setups. The injectors are currently being run like 39lb/hr injectors courtesy of the MAFterburner!

MJ
 

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Discussion Starter · #5 ·
Jim Vaccaro said:
Nice tunning job. Congrats.
Must be a hoot to drive with all that TQE. :D

jim v.
Thanks Jim. The tuning was pretty simple, a few clicks of the MAFterburner tuning software to do the injector compensation and about 6-7 pulls with the Afterburner-eFPC to dial in a new fuel curve to deal with the increased boost and changes caused by the LTs.

MJ

P.S. When are you going to dyno that beast?
 

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The Ubiquitous Jimmy V.
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MJ. ?
what are your other power mods?

jim v.
 

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The Ubiquitous Jimmy V.
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MJ?P.S. When are you going to dyno that beast?

MJ. I am not yet done..I need a chip adjustment for fuel.
I expect similar gains,however i can't post them because MM/FF is doing an article on my install and tune.

thank's for sharing your info with us.

jim v.
 

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Jim Vaccaro said:
MJ?P.S. When are you going to dyno that beast?

MJ. I am not yet done..I need a chip adjustment for fuel.
I expect similar gains,however i can't post them because MM/FF is doing an article on my install and tune.

thank's for sharing your info with us.

jim v.
Jim, do you know which issue it will be in?

-Brandon
 

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The Ubiquitous Jimmy V.
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Hunter said:
Jim, do you know which issue it will be in?

-Brandon
May issue i believe.
I know it sucks but that's the deal.

jim v.
 

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Jim Vaccaro said:
May issue i believe.
I know it sucks but that's the deal.

jim v.
Wow, that's a ways down the road. Oh well, I can't wait to read the article. It's cool to get to converse with "famous" people like you and Nitrous Pete!!!!!!
 

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Discussion Starter · #11 ·
Jim Vaccaro said:
MJ. ?
what are your other power mods?

jim v.
- Stock Lightning (2.93") upper pulley
- 2lb Metco lower pulley
- Kooks 1-5/8" LTs with JDM H-pipe
- Magnaflow Cat-back
- 9" Powerstack filter
- BBK Twin-65mm throttle body
- CNC/hand-ported blower inlet adapter
- Diablo Sport Deltachip (Shawn Ellis)
- 50lb/hr injectors with MAFterburner to do injector scaling
- Afterburner-eFPC STAGE2 for air/fuel control
- BR7EF plugs gapped at 0.033"

485rwhp/521rwtq SAE (0.97=CF)

MJ
 

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Discussion Starter · #12 ·
Jim Vaccaro said:
May issue i believe.
I know it sucks but that's the deal.

jim v.
Been trying to get the MAFterburner in MM&FF since last April. It will be in next month's issue.....exactly one year later. Can't talk about the results however..... :)

MJ
 

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mjchip said:
Been trying to get the MAFterburner in MM&FF since last April. It will be in next month's issue.....exactly one year later. Can't talk about the results however..... :)

MJ
I can't wait to read about the MAFterburner. Is the article worthy, or have you seen a final draft yet?
 

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Discussion Starter · #15 ·
Hunter said:
I can't wait to read about the MAFterburner. Is the article worthy, or have you seen a final draft yet?
:D
 

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mjchip said:
Effect of injectors alone = ZERO. I tuned the setup to run the exact same air/fuel so I could make a fair comparison between setups. The injectors are currently being run like 39lb/hr injectors courtesy of the MAFterburner!

MJ
Do you mean to say that the MAFterburner compensates for the mismatched calibration between the #50's and the stock mass air meter that is calibrated for the stock 42's (39.7)?
 

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Hammer,
Yep, I think so, as long as you adjust in the right places :D

Mark, what does your boost do now?

Do you still get drop? On my car, I'm not sure the drop is slip. Since you already have the lower setup , I'd try the 3.1 upper with a 4 # lower ring, should give almost the same ratio of blower to crank speed, but the upper will have more mechanical advantage over the blower shaft to make slip less likely.

JT
 

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mjchip said:
- Stock Lightning (2.93") upper pulley
- 2lb Metco lower pulley
- Kooks 1-5/8" LTs with JDM H-pipe
- Magnaflow Cat-back
- 9" Powerstack filter
- BBK Twin-65mm throttle body
- CNC/hand-ported blower inlet adapter
- Diablo Sport Deltachip (Shawn Ellis)
- 50lb/hr injectors with MAFterburner to do injector scaling
- Afterburner-eFPC STAGE2 for air/fuel control
- BR7EF plugs gapped at 0.033"

485rwhp/521rwtq SAE (0.97=CF)

MJ
Why are you using a Diablo Deltachip? Isn't the MAFterburner and Afterburner suppose to handle the tune.
 

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Discussion Starter · #19 ·
HAMMER said:
Do you mean to say that the MAFterburner compensates for the mismatched calibration between the #50's and the stock mass air meter that is calibrated for the stock 42's (39.7)?
Precisely.

MJ
 

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Discussion Starter · #20 ·
JT said:
Hammer,
Yep, I think so, as long as you adjust in the right places :D

Mark, what does your boost do now?

Do you still get drop? On my car, I'm not sure the drop is slip. Since you already have the lower setup , I'd try the 3.1 upper with a 4 # lower ring, should give almost the same ratio of blower to crank speed, but the upper will have more mechanical advantage over the blower shaft to make slip less likely.

JT
Hey JT,

Boost drops about 1-2psi at redline with ZERO belt slippage. The drop at this time is not due to slip, it's due to falling efficiency of the blower.

MJ
 
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