What is meant by tune right, target AFR?

 

get a simple on/off system with a solenoid valve and run a GOOD failsafe like the aquamist dds3 (aquamist hfs-1) or the zeitronix zt2 (TTP system). Effective, predictable to tune and safe.

 

+1 to that?

 

What type of AFR consistancy and deviation from target AFR is considered good when using the aquamist?

 

AFR log for a WOT will be different from 90%/80%...10% throttle. Most cars are tuned for day to day driving and occasional track days - a comparison plot on a before and after non-meths injection will be better.

WOT is only a small section of the driving cycle if the car were used on the street. I just like to see a log for a normal driving cycle and see how the AFR behaves under those conditions.

 

The AFR should be easily predictable by the tuner without having to swap between normal load/rpm cell and acceleration and decelleration enrichment compensation to obtain a stable target AFR.

The only and the simplest way to achieve this is by mirroring the alcohol flow to the fuel. This way will keep the Methanol/Fuel ratio consistent so that the octane value remains the same throughout the fuel map (after onset of methanol injection).

Consistent M/F ratio keeps your knock onset level predictable. Utilising idc injection system is the nearest thing to putting high octane fuel in your tank.

 

yea im totally with you on having the m/f ratio but its definitely not the only way for you to tune a meth car smoothly...if thats true then theres thousands and thousands of customers that have been tuned that don't know what they are talking about when they post up how great the car feels...in theory you are completely correct but in reality it doesn't always hold true...

 

thats wierd....

89 @ 1/8
117 @ 1/4


did ur shifting suck or did it need more tuning?

your launch was great so i find it hard to say you cant shift..

you're trapping pump gas numbers in the 1/8th then really making it up the back 1/2


with my m10 nozzle and no fmic i was trapping 93 in 1/8 and 118 in the 1/4

That trap and that launch should be somewhere aroudn 11.5-11.6


Cheers!

 

Difficult to for me to see things any other way until someone explains to me in a more scientific terms how to merge a 2D curve into a 3D environment. Rather based on how great the car feels (not scientific enough for me).

Imagine a car that increase fuel flow based on boost only. - it won't go very far

 

Could have been taken to a pm but to answer your question, I would chalk it up to poor shifting. I make maybe 2-3 visits to the strip a year. On the street I'm just a lazy shifter because I don't street race(I should say rarely) and there's no reason to put unneeded stress on the driveline. No practice = poor shifting.

As for launching, I've owned enough awd dsm's to where it just comes naturally anymore.

 

So what would be a simple on/off system?

Thanks

 

well im not the most 'scientific guy' on here...i go by more of what actually works in the real world...if i based all my life off of scientific data i would go insane...theres scientific data out there that supports the most craziest of theories but that doesn't mean its true...to me if the car feels great what does it matter if it doesn't make complete sense scientifically...I have yet to see one design out perform anothers when it comes to performance of a system...even driveability...I personally love the primitive boost pressure kits...

 

Exactly my thoughts.

 

don't get me wrong, i think its awesome that all these new features are becoming available but theres no reason to think that the kits that have been around and we have been using are useless...kits have certainly come a long way though...which is great because it shows how much interest there is in this great niche of the performance market..AA member for life...

 

I have no problem with any kit as long as it inject water or methanol - they are all good. It is just a matter of how much time you are prepared to spend to get it right. In the end it will be a compromise but workable.

People will spend hundreds and thousands of dollars on engines components and some are very picky and some are not, some just don't know. I merely point out that there is a significance difference between the boost progressive system when it comes to delivering fuel octane consistency - the more % alcohol you inject, the wider the octane variance and some sort of fail safe mechanism plays a more important role.

One should make the choice right at the beginning, some systems may not be easily upgraded if one decided to be more refined performance later.

In real term, the cost gap between the systems is very small compared to a good set of connecting rods to an ordinary set.