How to increase throttle response?

[Dillinger]

So the gist of it all is that the numbers are just that - numbers.

[Moto-Mucci]

I know we've been talking about botched numbers - but look at the Miller graphs:

http://www.millerperformancecars.com/files/Gen%20III%202.5L.pdf

Even if those numbers are botched a bit (and not measuring from the peaks) - there is a significant difference in the peak numbers when comparing before to after.

The graphs look much different from that link.

[z31maniac]

You seem determined to convince yourself it's worth the money, so go ahead and buy it. Then dyno test it back to back at the same place, same day.

Otherwise your "butt dyno" will tell you it did something so you can justify your purchase.

[Moto-Mucci]

You seem determined to convince yourself it's worth the money, so go ahead and buy it. Then dyno test it back to back at the same place, same day.

Otherwise your "butt dyno" will tell you it did something so you can justify your purchase.

Sorry, not really backing my theory, as I'm not well versed on this - more so just asking why.

The custom tune sounds like it would be worth the money. I'll have to try to find someone reputable around here.

[nando]

exactly what we were trying to tell you, the quoted HP gain is not at the PEAK hp, it's at the point in the graph where the HP increase is biggest. So it may be +20hp, but it's not 168hp + 20hp = 188hp.

[Dillinger]

You seem determined to convince yourself it's worth the money, so go ahead and buy it. Then dyno test it back to back at the same place, same day.

Otherwise your "butt dyno" will tell you it did something so you can justify your purchase.

It is cheaper than a reman bosch afm.

[Moto-Mucci]

No I know, I can see that they're measuring from the greatest points of deviation. I was referring to the fact the deviation between the peak of before and after is much greater then 1.5hp in the Miller graph - since someone was referencing the MarkD chip as only giving you a 1.5 peak hp increase.

...but this is just going to go full circle to the "different dyno's, different motors" argument.

[z31maniac]

Sorry, not really backing my theory, as I'm not well versed on this - more so just asking why.

The custom tune sounds like it would be worth the money. I'll have to try to find someone reputable around here.

A custom tune is always the way to go, but you saw the relatively small gains to be had on a stock motor. Personally I'd live with and either go stand alone on a M20 build or go 24v.

[nando]

...but this is just going to go full circle to the "different dyno's, different motors" argument.

exactly, it only begs the question - what else has been done to that motor?

[Moto-Mucci]

I guess I'm too trusting.

[Dillinger]

I guess I'm too trusting.

I better spill here. Miller is a well respected tuner and I have seen a lot of their equipment run on the track. I am not all that technically inclined as I drive them but I don't really like getting greasy so I will not argue specs but I can assure you they are at least as on the up and up as any other tuner.

[Jand3rson]

AFM or MAF is not a huge difference if you are running a stock motor.

I have a fairly lightweight bottom end, and a 13.5lb flywheel on my 2.8L M20 and I have fantastic throttle response... and that is WITH the AFM.

I'll vouch for this, the throttle response of James' M20 is intense. He's also got a new throttle cable, too. I could feel a definite difference in his pedal response/feel in comparison to mine, it was much smoother.

[der affe]

i thought i'd chime in here. i have a 2.7 stroker with seta pistons, mildly p&p head "i" head, 292 cam, shortie MSDS headers, cat replaced with a 2 1/4" magnaflow muffler 2" mid section and a stromg cat back, split second ford MAF conversion, split second ARC-2a piggy back, Dbilas ITB's, and cone filter with a kamotors heatshield.

the throttle responce is awesome, except off idle from a stop. if you don't blip the throttle to get the idle up a little there is a little hesitation or small stumble first, then it goes just fine. i think that this is caused by the motronic 1.3's out dated engine controls and them trying to deal with the big cam. i have done a lot of playing with it and just can't get that stumble completely gone. standalone may be the only answer to that, but htat was planned as a future mod for the M30B3.5 S/C swap on the car.

[Liam]

So now I have the Miller MAF Gen III kit in my hands to play with.



I'm not so much after increasing throttle responce as wanting to try some things out that are not possible with an AFM but I'll install it first on my 325 and see what we get straight out of the box first.

I can tell you one thing right off the bat, my software guy says he hasn't seen anything quite like what's on Millers chip here.

[PiercedE30]

Shoot, should've gotten the W.A.R. chips with it.

W.A.R. chip = the BMW equivalent to Hondata (from what I have gathered from the BF.c Forced Induction forum)