First step toward turbo

You're an english teacher too. Ok, sorry for the vague pronoun.

The thing was the fpr, but I meant from a systems point of view...how does it integrate. I understand it boosts fuel pressure for manifold pressure increases, no big surpise there, it delivers more fuel.

I get what you mean by the afr and rpm. What I mean is that to fully deterine flow you need map, rpm and iat. With only a map signal, the fpr could be fueling too much or not enough, so it's kinda like a fudger, or good enough. Am I getting that right?

I guess given that the AFR can be between 12.5-13.5 on boost it's not a huge deal. What was the cost, do you remember??

Thanks,

C

Understood. I will move my iat to the area preceeding the throttle body somewhere. It's advised to use a open type for the turbo too, because they respond better (Quicker) to rapidly changing intake temps.

I looked at the density change from 0 to 200 deg F. It's not really that much, like 23% for that massive range, so I can see why it's not used sometimes ((0+460)/200+460)). I was kinda blown away how little it changed actually. I bet the 02 sensor can make up for it in most cases, then at wot it's not used anyway. when it's cold it's hard to detonate, so the lean mix doesn't really hurt you. It all makes some kind of sense.

I'll check into it. I'm still kind of curious to see if I'm up to the challenge of tuning it. I'm looking to trying the process after reading so much material.

Chay

CFoss wrote: Understood. I will move my iat to the area preceeding the throttle body somewhere.

I simply drilled another hole in the end if the plenum, right beside the power brake hose.  My (88) manifold had an extra boss/drill pad right there!  Tapped out to (3/8?) NPT, installed sensor, lengthened wires, done.

Dr.Fiero wrote: I added (moved really) my IAT probe over to the far side of my upper intake plenum.  Figured there's no point in measuring the air temp over at the filter!

A related question... At what air temperature reading from the IAT (MAT sensor) does the ECM no longer richen the mixture for "cold" weather driving?

And can that be artificially induced by grounding or shorting the IAT?

You can probably see where I'm going with this. After the engine has been running for a few minutes, I'd like to fool the ECM into thinking it's a hot day and the engine is all warmed up to see if gas mileage can be improved.

[EDIT] After posting I came across this interesting article about relocating the MAT sensor. That article is one of many informative tips to be found Here.

"Will the turbo simulator require cleaning or maintenance?
Yes, but not really!"

Now that's some funny !hit.

C

I don't care what kind of ram air you are never going to get over 1psi boost in your intake plenum without a mechanical device to raise the boost. 

      At best my holly scoop takes me from a negative pressure in the plenum to near zero when I am at a 130mph cruise.   

      If you by some crazy way, all you would need to cheat the system is a rising rate fuel pressure reg, and a check valve so the 1 bar map did not see boost.  With the minor amount of extra air the car would be fine.  The rising rate fpr would actually not even be needed until you found a way to make more than 2lbs of boost which is a LOT for a ram air system, if achievable at all.  

      Now if you manage to find a way to do it, please document it and sell the documents.  As everyone on the Fiero planet will be doing that mod.

Extra 200hp on what? A 20L engine?

Assume 1.5cfm/hp, extra flow would be 300cfm.

That's a lot more flow.

10% power I can see, at some astronomical speed, unachievable on our streets, thus rendered useless.

As far as your fueling question, it would not correct on speed. As the capt says it would be ok. It might be a bit lean at ultra high speed and WOT, but that's it.

It's been said the ecm can trim out 6-8% variance due to learning, so part throttle would be ok.

Chay