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Engine Management, Fuel, Spark, EGTs, and Air/Fuel Ratios This forum includes general electrical, modification, tuning, repair, replacement, identification and restoration of all components mentioned above including SMEC, SBEC, Logic Modules, aftermarket engine management, etc. Nitrous oxide posts go in here. This is the place

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Old 01-21-2013, 11:56 AM   #1
afpr needed with stage 3 cal and +20's?  
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like the title says...is there any need to get an afpr if you are running +20's with a stage 3 cal and a 3 bar map?

Seen it done a couple of different ways and wanted to see what everyone (collectivley) thought was the best route.

FYI, it is for a 90 Daytona Shelby VNT

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Old 01-21-2013, 01:17 PM   #2
Re: afpr needed with stage 3 cal and +20's?  
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Install a wideband then find out if you need to lean out the fuel.
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Old 01-22-2013, 03:32 PM   #3
Re: afpr needed with stage 3 cal and +20's?  
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to add to tryingbe's comment lol

I would also buy an OTC 2000 or 4000 off Ebay, dirt cheap scanner. Then run a test of the 02 while warmed up. If the thing is adding or pulling past 10% at idle and then at cruise the chip needs to go back or you use the AFPR to get it closer without sending the chip back.

Normally though a stage 3 doesn't need this unless you have a lot of porting and mods, it is rare with a stage 3. How ever you also mention a +20 injector and a 3 bar map, which tells me you mean stage 5, not stage 3 computer. At this level it is a good idea to have one for fine tuning, but if this is a stage 1 20 PSI build then your doing it without porting. So that type of build doesn't need much tuning, FWDperformance can hit that mark pretty easy.
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Old 01-22-2013, 05:36 PM   #4
Re: afpr needed with stage 3 cal and +20's?  
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duster_70 is keeping the peace
it is stage 3 when its a VNT SBEC from FWDP. but thank you guys for your comments! I was thinking that as well.

I did forget to mention that I have an innovate MTX-L wideband that I will be using as well to verify the A/F ratio at all times, I just wanted to know if I needed to get a AFPR as well when I install the stage 3 SBEC/+20's/3 bar MAP
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Old 01-22-2013, 05:48 PM   #5
Re: afpr needed with stage 3 cal and +20's?  
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well with a VNT there is no real engine work done anyway, just higher boost etc.

I can't see any reason for the AFPR with the VNT, as the VE doesn't change FWD should hit that easy with no changes. I believe Cindy mentioned she has a VNT with T28 and bigger IC as well, so it may have the cal she is running.
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