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| Subject |
A few thoughts |
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| Posted by |
induetime on March 29, 2011 at 9:33 AM |
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This message has been viewed 276 times. |
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| In Reply To |
Underlying cause of turbo lag? (3071 dyno/mod list inside) posted by 91Z32TT on March 29, 2011 at 04:22 AM |
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| Message |
Starting the dyno run 1000rpm sooner will show different results.
Which SZ 3" DPs does he have? They make a set for the 3071/76 turbo specifically that has a properly matched "primary" tube to the size of the turbo wheel. They have them made for their kits. It sounds like this owners turbo setup was made by someone else, judgeing by the .83 housing. So they might have the more common SZ 3" DPs that are sized for the othe popular 5 bolt turbos (530/700, etc), which is to small for the 3071.
I imagine the amount of timing that can be safely used in q16 (gregs dyno graph) vs 92 is a big difference as well.
SZ/ Greg /Seb have years of experiance tuning, so there might be something more or more refined in Gregs map as well.
Someone mentioned the jwt 400 cam, which iirc Greg has jwt 500.
Adjustable cam gears (which Greg has) can move the powerband around also.
From a recent post Ash made the MSP manifolds folwed more than Ash's own tubular manifolds, so i'm assuming the MSP manifolds also out flow the rtz manifolds.
The 4" fmic probably has more pressure loss across the core than the other avaliable intercoolers with 2.5" inlet/ outlets.
The fmic piping probably has more bends, tighter radius & more length than the smic piping route.
Each thing may not make a huge differance, but when you add them all together it does.
I hope this helps.
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