tici

iTrader: (1)

How correct is the 98 stock VE table?
Can I use it to check the IFR table? I mean: assuming that the VE table is correct can I adjust the IFR table until all the cell are +/- 2% running SD?

I ask because I tried that and I’m not happy with the result.
I have #36 Bosch injectors and an average of 64 PSI in the fuel line.
If I adjust the IFR table according to the VE table I have to multiply the values by 137%, but when I reconnect the MAF all the cells are positive: 5 – 10%.

MAF is stock, engine is internally stock and the intake is a FIPK filter (the Vortech is not installed now). Stock exhaust manifolds and cats.

Any idea?

Thanks!

Black02SS

iTrader: (36)

Hey Stef, just find out what they are rated at (45psi?) and adjust the IFR from that, then dial in the VE table without the MAF, then re-calibrate the MAF. I will never "think" that the stock VE table is correct after a few of the stock cars I have retuned, but that is just my opinion.

BTW-How ya been man?

tici

iTrader: (1)

Hi Chad! Not too bad over here, how about you?

The new injectors are Bosch #36 and I assume they are rated same as the stock injectors (# 28.4).
The stock pressure was 55 PSI and now I have 64 PSI.
So I calculated 36/28.4 * SQR(64/55) = 1.367 = 136.7% to multiply the stock IFR values.
If I use that in SD the stock VE table looks fine, so I assume this IFR table is correct.

BUT when I reconnect the MAF it's all too lean. Also at WOT: with a moltiplicator of 1.145 it goes up to 13.5 : 1!!!
1.145 is theoretically 12.8 : 1

So someting is wrong. Sure I can recalibrate the MAF, but is it possible that the stock MAF is so much wrong?
Or is it the FIPK that messes with the airflow measurement?

Forget about the blower: in winter it's disconnected so it's just a K&N FIPK, stock MAF, stock TB, stock engine.

Hey, are you still on AIM? I checked many times but you were'n there...

See ya - Stefano

Black02SS

iTrader: (36)

I'm on now.

tici

iTrader: (1)

mhhh... I see you online but I can't communicate!
I'm in the office and maybe our server doesn't let the IAM go through...
I'll have to try from home, in 5-6 hours

tici

iTrader: (1)

Soooo.... nobody knows?

98redorangeta

iTrader: (10)

The first two words may be part of the problum i dont know for sure but i wouldent be assuming any thing when it comes to tunning i would check and make sure first.

Ragtop 99

iTrader: (7)

if all you have is the intake and catback, I'd bring the VE table up a little, maybe 3 - 5% and then nock the IFR down a bit if needed. If your inputs are good, I would not deviate on the IFR more than +/- 5 percentage points. Then redo the MAF table to match.

LoWeLL216

iTrader: (1)

I wouldn't rely on your stock VE with any mods to be accurate. I also wouldn't tune your injectors by scaling them. Use the injector spreadsheet in the sticky or on RedHardSupra's website and change the IFR table to the correct flow rates for your injectors. After that retune your VE table in SD (no MAF) until it's correct and then if you like plug your MAF back in a recalibrate it. To recap:

1. Change IFR table (don't scale, use the spreadsheet)
2. SD tune your VE table
3. Recalibrate your MAF if you want to use it