How to increase throttle response?

[nando]

putting in a MAF is not going to help throttle response (much).

The problem is not the AFM - the problem is Motronic 1.3 with it's cruddy throttle switch has very poor acceleration enrichment. So when you stab the throttle, by the time the computer figures out it needs to inject more fuel, you've already had a big fat lean spike. Replacing the air metering device is never going to fix this. Ever.

The only real solution is engine management other than Motronic 1.3

also, there's no way the miller MAF gives you 20hp. It's a nice product and all, but not a chance in hell.

[kid325e]

Discuss.. Interesting information nando.

[kid325e]

Just read the info on the GenIII. Sounds really really cool.

[Holland]

S14 + 1 billion.

[Liam]

putting in a MAF is not going to help throttle response (much).

The problem is not the AFM - the problem is Motronic 1.3 with it's cruddy throttle switch has very poor acceleration enrichment. So when you stab the throttle, by the time the computer figures out it needs to inject more fuel, you've already had a big fat lean spike. Replacing the air metering device is never going to fix this. Ever.

The only real solution is engine management other than Motronic 1.3

also, there's no way the miller MAF gives you 20hp. It's a nice product and all, but not a chance in hell.

Not just the MAF makes the HP it is a chip as well, and you are correct about Motronic 1.3 and the T/P signal but a AMM rather than an AFM does improve the response a bit, enough to be noticeable.

There are other reasons to do this as well.

[nando]

even with a chip, it's not going to happen. I saw 10hp by losing the AFM and going to MAP, and this wasn't a stock motor. how are you going to get 20hp by basically doing the same thing to a stock motor, and then use an off the shelf chip rather than a dyno tune for that specific motor?

[Moto-Mucci]

S14 + 1 billion.

What's the point in spending that much cash to find and swap an S14 into the car when I could put that money into the M20 and romp on an S14?

[OrganicMechanic]

I dont know what to Say, but maybe 1 thing you can do is get a special 4 cylinder motor ;)

mmmm....I see what you did there, with the 3 letters

[Moto-Mucci]

Miller's response:

"Hi David,

No, you can't run any other software with the MAF conversion. The tune
is so much different with a MAF that a chip designed for the AFM will
not work. Our chip that comes with the MAF is tuned to optimize
performance and allow your car to run smoothly on the MAF sensor.

--
Brody Saari"

[nando]

they probably had to change the load transfer function for the AFM to deal with the MAF. I don't think the signal from the AFM is linear, but the MAF is.. so makes sense you can't use another chip with their maf. It still won't give you 20hp on a stock motor though. ;)

[Moto-Mucci]

they probably had to change the load transfer function for the AFM to deal with the MAF. I don't think the signal from the AFM is linear, but the MAF is.. so makes sense you can't use another chip with their maf. It still won't give you 20hp on a stock motor though. ;)

So you think they botched their dyno graphs then?

[Lance Racing]

my apologies if you've already touched on these but don't overlook taking weight out of the car (sound deadening, etc). Also, what rear end is in the car? 4.10s are pretty easy to get.

[nando]

So you think they botched their dyno graphs then?

it's really easy to exaggerate the correction factors to get more favorable results. Just consider them highly optimistic..

[Moto-Mucci]

it's really easy to exaggerate the correction factors to get more favorable results. Just consider them highly optimistic..

Why is that so hard to believe? Most aftermarket software manufacturers claim around the same gains - with the AFM intact.

From Pelican:

"I recently go a hold of a Dinan performance chip for my E30. The benefits of this chip include raising the factory rev-limiter to 6900 RPM and increases horsepower from 168 to 183. It does this by essentially re-configuring the fuel injection map to advance the timing, fuel pressure, etc. This translates into a dramatic seat of the pants change in power, or as we refer to it, the butt dyno."

http://www.pelicanparts.com/bmw/tech...ip_install.htm

[Dillinger]

even with a chip, it's not going to happen. I saw 10hp by losing the AFM and going to MAP, and this wasn't a stock motor. how are you going to get 20hp by basically doing the same thing to a stock motor, and then use an off the shelf chip rather than a dyno tune for that specific motor?

Once you have this maf and chip you could tweak it couldn't you?