850cc Primary

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Jul 21, 2005 | 02:51 PM

sdminus

Thread Starter

Senior Member

Joined: Jul 2004

Posts: 123

From: Norwich

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

Jul 23, 2005 | 11:05 PM

rfreeman27

Senior Member

Joined: Dec 2002

Posts: 4,107

From: fredneck MD

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...

Jul 24, 2005 | 12:04 PM

Mr3plus1

Junior Member

Joined: Aug 2004

Posts: 7

From: San Antonio/Houston

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.

Jul 24, 2005 | 09:00 PM

rfreeman27

Senior Member

Joined: Dec 2002

Posts: 4,107

From: fredneck MD

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.