Fuel pressure question - NA EFI 347

[Balaska347]

Exactly a NA car won't hurt itself from being to lean it just won't make power. A power adder car will keep making more hp as you lean it out until it blows itself up thats why the wideband will help them. For a NA car it is pretty much a waste unless you enjoy watching the gauge. It's all driver preference.

[phillysrt4]

Exactly a NA car won't hurt itself from being to lean it just won't make power. A power adder car will keep making more hp as you lean it out until it blows itself up thats why the wideband will help them.

???

huh?

[Balaska347]

I can't see how it is a waste.Still have to tune a N/A car and my pms and wideband did great on my 349

That made 435 rwhp at 12.2 a/f

The guy I sold it to dynoed it and got those #'s but hasn't been back to thre dyno since to lean it out.I never dynoed the car I just tuned it with pms and a wideband

The reason I say its a waste is because I bet I could have made the same 435 maybe only 430 without the $900 PMS and a $300 wideband with the car on a dyno with a a/f reading. So I could have saved $1100.

Philly what are you confused about?

[phillysrt4]

Philly what are you confused about?

if a cylinder is lean, it runs hotter. If it runs hotter, its more susceptible to detonation/knocking. If there is sufficient knocking, you can damage your engine.

I just never saw any evidence that NA engines are "immune" to this, or that this only applies to FI cars.

[Balaska347]

if a cylinder is lean, it runs hotter. If it runs hotter, its more susceptible to detonation/knocking. If there is sufficient knocking, you can damage your engine.

I just never saw any evidence that NA engines are "immune" to this, or that this only applies to FI cars.

You're right NA cars aren't immune to hurting themselves but it take a lot more to hurt a NA car. What I was trying to say is that the NA car will lay over first and you will know to add fuel. A power adder car will keep making power until it will usually push out a head gasket or break a piston. Widebands are a nice tool to have but if it was me I would go the other route.

[phillysrt4]

You're right NA cars aren't immune to hurting themselves but it take a lot more to hurt a NA car. What I was trying to say is that the NA car will lay over first and you will know to add fuel. A power adder car will keep making power until it will usually push out a head gasket or break a piston. Widebands are a nice tool to have but if it was me I would go the other route.

ahhhhh ok i see what you mean now.

sorry for the confusion.

[349Stroker]

The reason I say its a waste is because I bet I could have made the same 435 maybe only 430 without the $900 PMS and a $300 wideband with the car on a dyno with a a/f reading. So I could have saved $1100.

I never new chip tuning on a dyno was free!!!!!

and every time you chip tune guys change something it is back to the dyno

Even w/o a chip you still have to go back to the dyno and tune and it ain't free.As for me, I just go out the road and change some numbers

[Balaska347]

I never new chip tuning on a dyno was free!!!!!

and every time you chip tune guys change something it is back to the dyno

Even w/o a chip you still have to go back to the dyno and tune and it ain't free.As for me, I just go out the road and change some numbers

I wouldn't go with a chip either the computer shouldn't need to be touched unless you are having driveablilty issues on a NA car. I will tune it through the fuel psi regulator and timing. You want as much timing you can run without knocking and a a/f of 12.8-13.2 NA. The other thing you want to watch for is a relatively flat fuel curve which it should be with a NA car. To do all this for my car I had $60 in dyno time which everyone wants to see what kind of HP their car is making anyway. And if I make a large enough change that I will be worried about the tune I will be putting it back on the dyno anyway to see what kind of HP I gained.

I called everywhere I could find within 5 hours of here that custom tune through the computer and told them what I have and asked them if they can get me anymore HP they all said probably not or maybe a few. One guy told me oh yeah I see around 30 RWHP all the time so I took my car all the way there and after 6 hours on the dyno he gave me all my money back. If you can get me just 10 more RWHP with you and the PMS I will pay you to tune my car. I just bought a new cam from AFM so I wouldn't mind putting it on the dyno.

[Balaska347]

Oh yeah there is no right or wrong answer here it is basically preference and how much money you want or have to spend. You also have to have the knowledge to tune on your own which a lot of people don't have.

[94Cobra]

Thanks for all of the input everyone. Perhaps I will take it up to Big Shot or another dyno to see where the A/F is at. Oh yeah, and where the power is at as well. If I hit 360/370rwhp, I will be happy and leave it alone.