DRiving around tonight I achieved 18.5 lb of boost.....(ususally 16 is about it)the only thing different on my car is the DFIC..... it is 72 deg in Atlanta tonight..... I have some equip and will be making measurements this week.....no one is more surprised than me.....maybe something is wrong with the gauge but it seems fine the vac readings are normal.....hmmm

 

If it has a lowerer pressure drop across the unit then you'll create more boost.

EDIT: Doh!! Thanks Matt

 

a LOWER pressure drop across the IC creates more boost....

I haven't tested the DFIC yet, but the pressure drops can be surprisingly large.

Note that this is no load data, with the car not moving, so actual airflow under full load will be higher... As will the pressure drops.

Matt

 

Thanks for sharing Bob!

I originally thought that boost was a little less with the DFIC, which would not be surprising given the nice temp deltas shared thus far. But, if such low temps can be achieved with increased boost, that would be spectacular!

Please share more of your testing Bob... thank you.

Matt, it sounds like you'll be getting something for testing quite soon... just not the DFIC, at least not yet. I'll let you know when I get mine, hopefully in the next couple of weeks.

 

Yeah... I am not making any claims as I really don't know what it means but I have not seen 18.5 ever..... only 18 with the WMS exhaust in the open mode...... and again the gauge could be off but like I said the vac readings are normal......the car has a code for the cat going bad again (third one) but is running very strong.....very strong.

I'll keep you posted....this is what keeps it fun

 

More boost is not necessarily a guarantee of more HP.
It's possible the restriction is prior to the combustion chamber and is restricting flow.
Higher psi but lower or maybe just less efficient cfm.

 

FWIW my intake manifold and snoots have been extrude honed......to match the head......and the car has never run this strong......does all this mean anything...I don't know..... I'm pointing to the DFIC as it is the only change....

 

Did you like them when you got them?

I've looked at them and had an intake done years ago so I like the process.

It's a down the road project.

TIA

 

honestly......I could have spent my money better.....this is not a good bang/buck mod IMO..... I did it because I had the $ and wanted get my engine to max with out TC.....if you have done everything else.....and just have to try the next thing OK..... I used this same logic when I switched from Schrick "street" cam (now discontinued) to the "race" and that was a very worthwhile mod...... maybe this is doing more than I can notice but I really did not see much.... Randy Webb claims about 5 hp...... I don't think that I got that... but all engines are different and my engine is running strong for non TC....so who knows.....no slam on Randy .... I'm sure he got that when he measured...

 

Matt clearly has a grasp on the subject so he is worth listening too!

But my layman thought is since boost is measured before the IC then if your boost goes up (after an IC change ) then the IC unit is more restrictive thus building pressure. Conversely, if it goes down the IC is less retrictive.

Having said that - when I switched from stock IC to the GTT IC, my max boost did not really change (just under 15lbs) but it seemed to take a little longer to reach the max boost. When I ran stock and nailed the throttle the needle would jump and go to 14.5lbs - now it seems to jump to 13.5 and then proceeds to 14.5lbs.

 

Hey Bob...did you get the heat shield installed? Also, do you have the Auterra OBD reader? It can show you actual Hg readings...

 

Brings up a good point....Spider, where is your gauge seeing boost from? If it's before the IC core, it could see increases if the IC is more restrictive, but if it's after that's just not gonna happen....the more restrictive the IC, the less boost you'll see after...

 

everyone i know gets boost readings from intake manifold, which is post IC. where else do ppl take readings from?

 

No doubt and I always do.

 

Depend on me at your peril!

Matt

 

Depends on what subject we're grasping

And I'll thank you to not be grasping mine

Unless you're Selma.....you aren't....are you

 

and since that's the basis of everything, there is no subject that I won't express an opinion.

Matt

 

i thought it was pre - ic the location of the std vaccum tap?????

 

i don't think so. Are you talking about the std location of the vacuum source that the fuel pressure regulator sees? If so, this is definately on the intake manifold, which is post IC. This is the same vac source that the VGS system taps into

 

so air moves from right to left thru the IC? LOL LOL LOLLOL

aren't you all glad I'm not a mechanic at your dealer !!!!!!!!!!!!!!

 

If you are measuring boost by the TMAP sensor, or with the usual tap-off of the fuel regulator source, you are getting the boost reading after the IC. In that case, it would seem that the DFIC is the least restrictive of what you had before it and your engine is seeing the most boost right where it should be, at the manifold. In that case, you got some good numbers.

 

FWIW.......my gauge was probably off...... tonight at 73 deg 37% humidity the top boost was 16.5..... man the car is running strong...... (I can't imagine Tuls 340 WHP)

 

how does a gauge go off one day and not off on another? Loose? Bad fitting? Bad gauge? What gauge do you use?

 

these are the autometer gauges from the gauge pod..... generally woks pretty well...... somthing must be loose .... I'll check it out when I take the car for the AGS

 

Remeber that the DFIC comes with pre and post bungs, which will allow for
convenient pre/post boost or temp readings.... The bungs are
pre-threaded with an 1/8 NPT thread.

peter
team M7
562-608-8123