850cc Primary

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07-21-2005, 02:51 PM

sdminus

Senior Member

Thread Starter

Join Date: Jul 2004

Location: Norwich

Posts: 123

Having my fd mapped in the near future and was thinking of putting 850cc primaries instead of uprating the secondaries.

How involved is doing this and is it worth it.

Scott

07-23-2005, 11:05 PM

rfreeman27

Senior Member

Join Date: Dec 2002

Location: fredneck MD

Posts: 4,107

Its pretty easy to put the stock secondary 850's into the stock primary rail. You need to shave off about 2-3mm from the top of the rail so the shorter 850's can seal...

07-24-2005, 12:04 PM

Mr3plus1

Junior Member

Join Date: Aug 2004

Location: San Antonio/Houston

Posts: 7

Your city gas mileage is gonna suck with those 850's. And its a total pain to get a nice smooth idle with them too.

07-24-2005, 09:00 PM

rfreeman27

Senior Member

Join Date: Dec 2002

Location: fredneck MD

Posts: 4,107

that depends on your EMS. Something like a haltec or even better a tecIIIr can control them with enough power to smooth out your idle. I plan on running 1600 primarys in a few months.