take ve values at known psi and known resulting afr
take desired psi and divide by known psi
now take known values, and that number you just got, and multiply new row by it.

I just walked hi im sean through this too. really simple and effective for roughing in a map

for example, if your VE values are 100 at 8psi
10/8=1.25
100*1.25=125

the most basic math

 

Sounds a lot easier than just guessing. Now if I could just figure out this sudden 2k idle after the misfire...

 

Only that doesn't work with boost psi, use absolute pressure. Obviously the engine doesn't breathe in 25% more air going from 8 PSI boost to 10 PSI boost. Going from NA to 15 PSI will more or less double it though.

In his example going from 8 PSI to 10 PSI would be

8 + 14.7 = 22.7 absolute PSI
10 + 14.7 = 24.7 absolute PSI

24.7 / 22.7 = 1.088 = 8.8% more air. So if VE at 8 PSI was 100, at 10 it would be 100*1.088 = ~109 VE

 

his ve table is in kpa
which is absolute
my post was just an example to show the concept

 

Your example was trying the help, which is good, but it was a bad example when you use the wrong numbers. If you truely did that on purpose, don't say boost and say it's an example to show concept, and say to use kpa that's absolute. Not say use boost and give an example using boost with numbers and results.

 

omg stop being such a douchebag. I can't even fully comprehend what you're trying to say in this post.

his ve map is in kpa. everyones map is in kpa in MS

my example was just an example. no one's ve map reads in relative pressure. everyone's is absolute

leaving this thread now. you can help OP out and be the smartest person on the internet.

 

I said your example had good intent (and most of your post do), but you used the wrong numbers to illustrate your point. If the OP used your example, he would put bad VE values in his table, such as the ones you illustrated. You can be pissy, and get offended, or you could just acknowledge your example used the wrong numbers and not make a big deal about it. Not everyone is always right all the time.

 

sorry to thread jack...does this work if your known good cells are in vacuum and trying to calculate your cells in boost? I'm still N/A but should be turbo in a couple more weeks. I'm wanting to rough in my boosted cells.

 

Bumped up the boost, because 10 psi feels slow now. Listen to this new guy / girl. It takes days for 10psi to feel slow. Its like drugs. Really fun drugs.

running 17-20 ish now and it feels fast again. slowly working on the fuel map, but its still super rich in some spots. but here it is.

2 psi @ 1900 rpm, 10psi @ 3250 and 17 @ 4200

To the house Pro's, why the boost drop when still WOT? Is the MBC to blame? or super shitty AFR? or both?

 

for starters, that afr is rich. like crazy rich. get it at least into the 11-11.5 range stat
next, where is the mbc referenced?
next, what does your timing look like up there?
next, no leaks right?

 

Yeah, this was one of the first runs in this much boost, so...rich. tuning that now. Brains spark map for 93 octane, so pretty tough I think. I'll post it tomorrow. Can't imagine any leaks, **** is tight. Real tight, but I'll pressure test it this week. MBC is refeeced at the tubo outlet. Turbo still sounds like a supercharger, kind of unnerving, but I keep driving it. The car is so loud without sound deadening, missing door panels, rattling hard top, and 225's throwing rocks. It's super hard to capture on sound clips.

 

this is the problem
reference from right before tb for it not to taper

 

10-4. Will do this today.

 

So I went to the 1/8 mile tonight. Gawd damn that beats up your ****. I think I took about 20,000 miles off my fm2 clutch. If i did get a good launch, I would start spinning tire at the 60 foot, tben I'd have to peddal it to get it back. Later in the night I cut some 100 lights, but started hitting boost protection. ...Whatevs.

 

Nice pass! Yeah it can be tough! I broke an axle last time I was there. Been so busy lately I haven't had time to race the car in over a month.... :( On the clutch it's hell without drag radials. With good tires you can just almost dump the clutch on the launch vs slipping it.

 

Well this is an unfortunate situation. Seat hates everything about my cage. When I made the cage, I had full range of motion with room to spare, with a factory seat. Crap.



Picture was lame and I was tired, but it also hit the shoulder area of the seat as well. Soooo, get out the damn SAWSALL!





really close, but it fits! Now I have to fill in this void.

 

Is that a Sparco Evo 2? Contemplating building a cage around that exact seat (I have a strangely long torso for my height so it's hard to find a seat with high enough shoulder belt holes).

 

It is. Takes up a lot of room.

 

Still getting this evo2 into my ride. Who new it would be such a mission to get this seat, a 5'-10" driver with a helmet, to pass the broomstick test? Not me.

 

Um I think your shot of NOS was a bit to large and you sprayed to early. Hence why your floorpan fell out.

Also no way you are going to be faster on an onramp from 30-60, you lack the IRTB's and throttle response.