Where did I go wrong?
05-01-2008, 03:14 PM
#33
TECH Apprentice
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Without FI I don't see how #7 from its own vaccum could draw more air than the rest of the cylinders. Since #7,8 are furthest away from TB they should both see less air equally. I understand how a poor design can restrict flow but not how it can enhance VE more so than the rest of the cylinders. #7 would have to have lower restriction on air flow than all the rest. Being at the back of manifold this would seem unlikely. It's hard to believe that flow balance testing on this manifold was not done prior to reaching production. Could additional heat soak be a factor at back of manifold? I have not seen the stock manifold cut/taken apart sooo just trying to understand.
Are turbo guys with the vic jr. manifold seeing these problems?
Are turbo guys with the vic jr. manifold seeing these problems?
05-01-2008, 04:25 PM
#35
Without FI I don't see how #7 from its own vaccum could draw more air than the rest of the cylinders. Since #7,8 are furthest away from TB they should both see less air equally. I understand how a poor design can restrict flow but not how it can enhance VE more so than the rest of the cylinders. #7 would have to have lower restriction on air flow than all the rest. Being at the back of manifold this would seem unlikely. It's hard to believe that flow balance testing on this manifold was not done prior to reaching production. Could additional heat soak be a factor at back of manifold? I have not seen the stock manifold cut/taken apart sooo just trying to understand.
Are turbo guys with the vic jr. manifold seeing these problems?
Are turbo guys with the vic jr. manifold seeing these problems?
NA this isn't an issue from what I've read, it is an issue with FI.
05-01-2008, 06:20 PM
#36
Launching!
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i was commanding 23-25. The afr was at 11.5 all the way through the boost but it was falling on its face at 4400rpms. I tried a few things and couldn't make it pull, my timing tables dropped off at that rpm so i bumped it up. It pulled better but my afr dropped to 10.5 for some reason, thats when i stopped and noticed the knock.
05-01-2008, 09:05 PM
#37
Launching!
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i asked about a 6L eng and 4l80e, they didn't have many and wanted $4000 for the pair, so i thought i'd stick with the 5.3 for $1200. What do you think about the turbo sizes TurboBerserker? Am I close?
05-01-2008, 09:22 PM
#38
So, what is the solution? Is there any good remedy on improving coolant flow around #7? Anyone can answer this, so maybe it will help t thall, but others on their FI builds too.
05-02-2008, 05:02 AM
#39
Ditch the Iridium plugs and go with something like a NGK TR6, Iridiums hold too much heat in the electrode and are prone to causing detonation. Also as mentioned previously your timing is way too high. Some times depending on KR settings you will get KR then when the Knock actually occurs it wont show up on your scanner. I have no idea why but I have seen it with the stock KR settings.
05-02-2008, 08:34 AM
#40
You are getting good advice in this thread.
Timing to high.
Possibly the plugs.
Intake prone to pop #7. I also have heard all the possible causes for #7 going. More airflow to 7, coolant flow in the area (Evans coolant systems to help) and #7 prone to carbon build up due to the PCV system dumping oil nearest to it.
Build forged for some safety net. There are better intakes for safety net with FI. If you are like most you will kick yourself for not going at least 6.0L. It sounds like you have the potential for much more power than a stocker engine likes long term. Build it now or wish you had later IMO.
Timing to high.
Possibly the plugs.
Intake prone to pop #7. I also have heard all the possible causes for #7 going. More airflow to 7, coolant flow in the area (Evans coolant systems to help) and #7 prone to carbon build up due to the PCV system dumping oil nearest to it.
Build forged for some safety net. There are better intakes for safety net with FI. If you are like most you will kick yourself for not going at least 6.0L. It sounds like you have the potential for much more power than a stocker engine likes long term. Build it now or wish you had later IMO.