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Old 11-30-2012, 09:53 PM   #1
alteredego
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Questions for all SVT JRSC BBK owners. Need some data!

Trying to get a handle on an issue and have a few questions;

Whats your peak boost @ 7200rpm?
Peak boost @ 6000rpm?
Peak boost @ 4000rpm?

Idle speed full cold, what does it pop up to when first started?
Idle speed full cold, what does it settle at after the initial rpm jump?
- idle vacuum full cold, after the rpm settles initially, whats your vacuum reading?

'Warm' start. After being parked but not yet cooled off, what do the RPMs jump to when turned over?
What RPM does it settle to immediately after?

Idle speed when full warm?
Idle vacuum when full warm?

What type and brand of gauge are you using?

What size belt?

Factory tensioner? Upgraded? Mileage since last changed?

Exhaust system?

Catless?

Blower ever been rebuilt or ported?

If you can only answer a few of them, thats fine.

Thank you.


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Old 12-01-2012, 07:38 AM   #2
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I tune a LOT of these , what kind of issues are you having ? May be easier for me to help you from that angle

Tom
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Old 12-01-2012, 01:02 PM   #3
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My vacuum fluctuates from perfect to what I would consider a vacuum leak, without it exhibiting signs of a leak(no hanging revs, only unusually high revs on a hot restart, 2200 and falls to normal idle)

Vac is sometimes a normal 19in/hg at 950rpm hot idle(which I believe is slightly high for a ford racing tune). Other times no better than 16in/hg.

I have not been able to find a vac leak anywhere in the system.

Main reason for my concern is my peak boost is roughly a pound to 2 pounds lower than it should be at redline.

I previously would see 11lbs at 7200rpm without issue. Really cold out bearing 12psi.

With no changes other than sitting for a very long period of time I only see 10lbs at redline below 30 degrees and no more than 9/9.5 any other time.

I suspect a crack in the intake Mani or a hose, but have not been able to find/prove that as of yet.
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Old 12-02-2012, 08:56 PM   #4
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My setup would only see a max of 10psi at around 5k-redline.

I ran an auto-meter gauge from an SRT-4 neon, lol. Belt and tensioner were whatever came spec'ed with the BBK. Exhaust was a 2.5 catless ORP, 2.5 MBRP catback. Also had a 65mm tb and short ram intake. Never rebuilt, had 100K miles on it and it never peaked any higher than 11 on the coldest days.
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Old 12-03-2012, 10:51 AM   #5
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Hard to say , If you had or can barrow a xcal3 you could datalog and see whats happening with the idle , this would also confirm a Vac leak as well

Tom
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Old 12-05-2012, 09:43 PM   #6
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Leaking by-pass from blower to manifold? Check to see if it holds vacuum.
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Old 12-06-2012, 09:26 AM   #7
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Quote:
Originally Posted by vigdrtim View Post
Leaking by-pass from blower to manifold? Check to see if it holds vacuum.
I did actually swap that around with a known good one.

No change.
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