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Post by tiresmoke69 on Mar 8, 2010 16:37:51 GMT -5
I am sure many people run into this problem that occurs on turbo fords. Once the VAM pegs out it can no longer measure in coming air flow and it becomes a pain to tune the car.
Please share any tips or tricks for tuning with a big vam that is past the point of pegging out.
I have heard of people making big power with the vam and im sure there are some ways around the pegging out situation.
My current goal is to make 300 whp with the vam.
Here is a list of my mods:
Mods: t3/t4 turbo
Front mount intercooler and blow off valve.
Hand ported and polished head, exhaust
manifold, and lower intake.
Open downpipe. 42# injectors and walboro
255HP fuel pump.
Tuned with Binary Editor using a
quarterhorse tuning chip and AEM wideband
kit.
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Post by Stinger on Mar 8, 2010 17:17:35 GMT -5
As long as you keep the afr in check after the vam pegs, it's not a large problem at that power level. There really shouldn't be an "issue" with tuning it since you have a quarterhorse. Just make sure it gets enough fuel at high load/rpm. Dial in the base fuel table to the correct target afr, then use the WOT fuel adder to get the wideband readout to match the table afr.
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Post by tiresmoke69 on Mar 8, 2010 22:26:52 GMT -5
Here is my current base fuel table. What do you suggest to change on it if im shooting for a 11.8 afr tune on 93 octane gas.
Also I just ordered a AFPR from holley.
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Post by Stinger on Mar 9, 2010 0:53:38 GMT -5
You'll have to datalog your current afr and either use calculations to figure out how much fuel to add/subtract to get to your end value, or use trial and error. Without knowing you current afr though, nothing more can be said.
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Post by tiresmoke69 on Mar 9, 2010 12:43:19 GMT -5
Well I just ordered a holley fuel pressure regulator to help with the need of fuel. I am trying to find a dataq from someone so I can datalog the AFR. Currently dataq is sold out of the 148 model and won't have any in stock until late april.
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Post by Stinger on Mar 9, 2010 13:16:35 GMT -5
Does the AEM not do internal datalogging like the LM-1?
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Post by tiresmoke69 on May 10, 2010 10:15:22 GMT -5
Yes it does, but I only have the sensor and gauge not the whole kit.
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Post by Stinger on May 10, 2010 15:35:42 GMT -5
Just turn your "under boost" portion of the table to 11.8:1 and then add/subtract fuel in the WOT fuel adder table where needed to get it to maintain 11.8 or so under boost at wide open throttle. This is easier with datalogging but completely doable without as well. Just takes multiple attempts to get it dialed in (like any tuning session).
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Post by onesillynotch on Nov 8, 2010 9:53:27 GMT -5
i made well over 300 with my vam but the key is you need a quick spooling turbo to get this to work(i.e. i had a 50 trim @ 28psi on a essy head with a bo 2.5 cam, e85, crazy timing)
you basically have to figure out what boost you are going to run and adjust the top CFM in the vam table till you are at the AF you want to run
this will only be good for that one boost and wont adjust to drastic weather temp changes but it does work and is the way i did it with sucess
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Post by Lyndon Pack on May 12, 2017 13:42:26 GMT -5
:)Ihave almost identical setup, exceptions: I am using a SVO eec that has been superchipped with a 65mm throttle body. My question is; Using this computer do I have to recirc with my blow off ie Raptor, or can I use atmospheric (Godzilla). I currently have both and am building the engine at present. Which one do I keep? I would rather use the Godzilla, is it compatible with your PIMP? I am thousands deep already and want to finish soon. Another 600bucks will set me back a few weeks. Thanks Lyn I am sure many people run into this problem that occurs on turbo fords. Once the VAM pegs out it can no longer measure in coming air flow and it becomes a pain to tune the car. Please share any tips or tricks for tuning with a big vam that is past the point of pegging out. I have heard of people making big power with the vam and im sure there are some ways around the pegging out situation. My current goal is to make 300 whp with the vam. Here is a list of my mods: Mods: t3/t4 turbo Front mount intercooler and blow off valve. Hand ported and polished head, exhaust manifold, and lower intake. Open downpipe. 42# injectors and walboro 255HP fuel pump. Tuned with Binary Editor using a quarterhorse tuning chip and AEM wideband kit. |
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Post by Stinger on May 12, 2017 14:29:44 GMT -5
The stock ECU uses a VAM which meters air (as does a MAF) which means you have to recirculate, or use a dual piston blow off valve that's designed for metered air setups (we sell them for this reason).
The PiMP doesn't care what BOV you use as it's a speed density setup so it's not affected by the BOV at all.
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