Are stock VE correct?
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From: Zurich - Switzerland
Are stock VE correct? 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!
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!
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?
BTW-How ya been man?
Thread Starter
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Joined: Oct 2003
Posts: 1,066
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From: Zurich - Switzerland
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
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
Thread Starter
TECH Fanatic
iTrader: (1)
Joined: Oct 2003
Posts: 1,066
Likes: 1
From: Zurich - Switzerland
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
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
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From: From Ohio now in that state up north
I assume they are rated same as the stock injectors (# 28.4).
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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.
Last edited by Ragtop 99; Feb 19, 2006 at 08:37 AM.
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Originally Posted by tici
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!
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!
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
