flow matched or non-flow matched?

[mikes86ttop]

Hey guys, just checking out turbo tweaks site and was wondering if it matters that much for the extra $45 for the matched set? Just looking for opinions before I place my order??, btw these are the 60's I'm referring to...thanks Mike

 

[626gn]

I once asked a vendor the same question. Here's their response:

"Personally I don’t believe it makes a bit of difference. Your intake runners are all different, you head ports are all different, your exhaust ports and header tubes are all different, there is vastly different amounts of air from cylinder to cylinder. Matching the injectors is not going to make them equal"

For the record this response did not come from Eric at TT nor did I pose the question to him. He and/or others may have a different opinion on the subject. Take the above answer for what its worth.

 

[wb's87]

I once asked a vendor the same question. Here's their response:

"Personally I don’t believe it makes a bit of difference. Your intake runners are all different, you head ports are all different, your exhaust ports and header tubes are all different, there is vastly different amounts of air from cylinder to cylinder. Matching the injectors is not going to make them equal"

For the record this response did not come from Eric at TT nor did I pose the question to him. He and/or others may have a different opinion on the subject. Take the above answer for what its worth.

And???? What did they say?

 

[626gn]

Their response is in the quoted passage above.

 

[wb's87]

I am not seeing it.

 

[626gn]

Their response was....

"Personally I don’t believe it makes a bit of difference. Your intake runners are all different, you head ports are all different, your exhaust ports and header tubes are all different, there is vastly different amounts of air from cylinder to cylinder. Matching the injectors is not going to make them equal"

 

[turbo89]

it matters... it also depends on the injectors.. if they are all balanced within 1 % that's 1 thing .. if they aren't its another... if you know what injectors flow more you can position them accordingly on lean cylinders

 

[earlbrown]

The reasoning behind that logic is sound..... but the application is not....


Balanced .vs all over the place:

Lets say you have an intake with port flow all over the place in both examples. Average flow is "X" and tolerance is +/- 15%. With a 'perfectly' balanced set you're variance will be 15% off. The highest flowing port will be the leanest and that's the cly that will go lean and knock first (all things being equal).


Now let's put that same manifold with injectors all over the place... if you happen to put a high flow injector on a higher flowing port AND the error is the same level of extra flow, you will accidently bring the A/F ratio more equal....

BUT! what are the odds on having 6 mismatched injectors that just happen to have 6 perfectly mismatched injectors fall into the correct hole?


Moral of the story: matched sets won't stack up tolerances as much as pairing up two (or more) variables.

 

[626gn]

 

[mikes86ttop]

Thanks for the quick responses guys...Mike

 

[TurboTnZ06]

Years ago I bought a set of unmatched 80#'s from TT when they came out. I had Chuck clean and service them just to check them out a few weeks ago, they were all very close in tolerance 1-2%.

 

[earlbrown]

Oh yeah.... I forgot to mention that... An 'unmatched' set might be pretty damned matched.

 

[GNONYX]

I bought my 60# set from Full Throttle Speed years ago they were between 1%-2% of tolerance.
You might want to read:
http://performancefuelsystems.com/InjectorFlowMatching.htm

 

[mikes86ttop]

Cool stuff guys, good info...Mike

 

[earlbrown]

Oh yeah.... I forgot to mention that... An 'unmatched' set might be pretty damned matched.

Just what is 'dumb' about that post Brandon706? Personally, what I've seen with my own two eyes are that modern injectors are pretty damn close out of the box.