Ha ha glad you got it fixed man. Some times the dumbest shit gets you!

 

ha well turns out my vam is bad too. i finally got to test the other and its got a slight flat spot in it. it would hiccup just slightly with the origional vam in it. but it sure does run a hell of a lot better with the bpv in the right way . i even popped an intercooler pipe off last night, and it was stingers kit!

just an aside: im contemplating advancing my timing a few degrees. this fmic setup makes the small turbo seem laggy. anyone have any opinions on this? im hoping too that i can get it to not richen up so much when the vam door gets slammed open at boost onset, and i can keep it from leaning out too much with the fpr. thus, i get a more consistent fuel curve. thoughts? opinions? i just want it to build boost/rev faster and be a better dd in traffic since its quite a dog out of the turbo.

 

The intercooler will not cause lag. Have you pressure tested your intake system for leaks? What are you using for boost control?

I've tuned enough of these to know that's not true. The VAM is pegged around 25lbs/min of airflow, that's about 250 flywheel hp.

 

i have not tested my system yet, but i am using the gillis valve for boost control. i had to make an intake manifold gasket for the upper to lower junction when the motor went back in that was kinda shitty, but im replacing that when i replace the vc gasket this week.

i was talking with stinger about this and he mentioned to me that these cars tend to run real rich on the bottom, and then lean out as the rpms increase. hence my thoughs being if i advance the timing it wont richen up as much, and i can still keep it from being hotter than 12:1 afr with the fpr. i could be completely wrong tho, which is why im posting here for advise i wish i understood the programs well enough to tune with a chip or stand alone. tuning more modern hondas is much easier to me tho so i have some work and research to do first.

 

I'd have to diagree here...if an intercooler and piping is oversized it will slow spool. Cant keep enough volume of air.

 

Can you explain how an oversized intercooler and piping can cause slow spool?

 

I was tired when I wrote that. Let me rephrase....not slow to spool but laggy. Turbo will spool, but it will have have lag if the pipes are oversized too much for a small turbo. It cant keep up with the volume.

 

So you're thinking a larger diameter pipe and larger volume intercooler will slow down the airflow velocity and cause lag?

 

keep in mind im still on that baby ihi turbo.....but im interested in reading this as well. john do you have any input?

 

Here's how I see it and feel free to comment. I promise my feelings will not get hurt if I'm incorrect.


2" intercooler pipe 12 feet in length = 452.16 cubic inches
24x8x2 Intercooler = approximately 231 cubic inches
Intake manifold = 155 cubic inches
Total Volume of Intake System in cubic inches = 838.16 ci

3" intercooler pipe 12 feet in length = 1017.36 cubic inches
24x24x3 Intercooler = approximately 1037 cubic inches
Intake manifold = 155 cubic inches
Total Volume of Intake System in cubic inches = 2209.36 ci

A stock 2.3T upper/lower intake manifold is approximately 155 cubic inches.

Let's assume this 2.3T can flow 186 CFM at 3200 RPM. 186 CFM is much lower than I would normally see on a stock 2.3T setup. Let's also assume 360 CFM at 6000 RPM.

Lag Time in Seconds =
(Volume of Intake system in cubic inches/Flow Rate in CFM)*(60 / 3456)

0.313 Lag Time in Seconds = (838.16 ci / 186 CFM) * (60 / 3456)
0.162 Lag Time in Seconds = (838.16 ci / 360 CFM) * (60 / 3456)

0.824 Lag Time in Seconds = (2209.36 ci / 186 CFM) * (60 / 3456)
0.426 Lag Time in Seconds = (2209.36 ci / 360 CFM) * (60 / 3456)

The 2" pipe with smaller intercooler has 0.511 seconds of less lag at 3200 RPM than the 3" pipe with the larger intercooler. At 6000 RPM the 2" pipe with smaller intercooler has 0.264 seconds of less lag than the 3" pipe with the larger intercooler.

186 CFM can travel at 63 feet per second in a 3" tube.

I highly doubt anyone could notice 0.511 seconds of lag time.