Stat. rev limit with high boost
I logged my car today with the stationary rev limit set to 6500rpm and at a load site of 190 and I was building low boost … Now what I’m thinking of doing is changing the stationary rev limit load site to something like 10 from 190 and then go to the fuel and timing map and change those sites to let’s say:
Fuel table @ 6500 = 9 AFR @ load site 10 and 20 column (just to be on the safe side) and IGN table @ 6500 = -2 or -5 @ load site 10 and 20
With that, I think we can build some decent boost and most likely we will never hit those sites at normal driving condition … What do you think guys?
Thanks,
Az
Fuel table @ 6500 = 9 AFR @ load site 10 and 20 column (just to be on the safe side) and IGN table @ 6500 = -2 or -5 @ load site 10 and 20
With that, I think we can build some decent boost and most likely we will never hit those sites at normal driving condition … What do you think guys?
Thanks,
Az
Last edited by dudical26; Oct 15, 2007 at 07:05 PM.
Thats correct, if you are going to try to build boost its all done with the timing. I am going to kick myself for even using this word, but antilag like the autronic drops timing to -25*. I believe Bez had messed around with an ignition based launch control in the recent past and posted about it either here or on Aktive.
trust me adding fuel will help. think about it.
try it cells 120-160 retard timing try the 2step
now keep the timing the same add fuel add fuel in the same cells to about 10.5 and try it again
tell me if boost didnt build faster/more
try it cells 120-160 retard timing try the 2step
now keep the timing the same add fuel add fuel in the same cells to about 10.5 and try it again
tell me if boost didnt build faster/more
Last edited by bnice01; Oct 15, 2007 at 07:46 PM.
Except the reason that the AFR's are way off is not because the cylinders are underfueled. It had the right amount of fuel (or richer) in at least 2 cylinders and the other 2 just pumped air (full load plus boost so lets say 1250cc worth of air) diluting the O2 readings. More fuel is just going to load it up and make it bog. I tried every combination I could think of and timing made the most impact, but for the sake of arguement try it again. There is always the chance my results were skewed because of other variables.
See it help me build boost faster and also I got about 2psi increase with adding fuel. I wanted it that way because some times @ the track they have a pro tree and need it to build quickly. Timing did help but with it being leaner it built slower but I got the target boost I wanted, then it hit "add fuel". But be careful egt's go up pretty high and your turbo is taking a bit of beating. Good thing we dont stay in it that long.
No agrument bro just sharing my experience and hoping it can help others
No agrument bro just sharing my experience and hoping it can help others
Aside from simply building more boost, has anyone experienced improved launches with more fuel and less timing on the two-step.
When JB played with -10 timing off the two step he built more boost but his sixty foots suffered because the car bogged coming off the two step.
more boost is cool, but better launches is the goal.
When JB played with -10 timing off the two step he built more boost but his sixty foots suffered because the car bogged coming off the two step.
more boost is cool, but better launches is the goal.
I've pulled a 1.62 on stock Advans and stock clutch using the timing modification method. I launched with about 12 psi built @ 5500. I encounter more wheel spin than bog, but my track is never prepped on TnT night ... my best on the stock limiter was 1.78 I think.
I just made a change today ... I'm reducing the limit to 5250 from 5750 in hopes to reduce spin and get a little more from 1st gear.
I just made a change today ... I'm reducing the limit to 5250 from 5750 in hopes to reduce spin and get a little more from 1st gear.
Thread Starter
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Joined: Oct 2005
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From: Riyadh, SA
I'm still trying to work it ... See on my XML (88580014) I have two stat. rev limiters ... it could be that one is for the ignition and the other for fuel ...
Check the attached MoTeC M800 P&P ecu map (Stock map with JDM RS Mivec .. you need to download MoTeC ver. 3.4) ... look under Anti-Lag (Adjust / functions / Boost enhanscments) you will find that the recommended method is ignition cut and timing retard. So the point is that either you only cut ignition and retard timing or dump a lot of fuel to get the effect of an anti-lag (fuel burn in turbo)
Check the attached MoTeC M800 P&P ecu map (Stock map with JDM RS Mivec .. you need to download MoTeC ver. 3.4) ... look under Anti-Lag (Adjust / functions / Boost enhanscments) you will find that the recommended method is ignition cut and timing retard. So the point is that either you only cut ignition and retard timing or dump a lot of fuel to get the effect of an anti-lag (fuel burn in turbo)
Boost while launching is an overkill and presents unnecessary stress on the drivetrain if you ask me.
With stock 8 turbo among many other stock parts, I see 1.68 60's from a 6000rpm slip of the clutch. The timing is there because it's not rev limit knocking either.
You need a warm track with a lot of rubber laid down first
With stock 8 turbo among many other stock parts, I see 1.68 60's from a 6000rpm slip of the clutch. The timing is there because it's not rev limit knocking either.
You need a warm track with a lot of rubber laid down first
Aside from simply building more boost, has anyone experienced improved launches with more fuel and less timing on the two-step.
When JB played with -10 timing off the two step he built more boost but his sixty foots suffered because the car bogged coming off the two step.
more boost is cool, but better launches is the goal.
When JB played with -10 timing off the two step he built more boost but his sixty foots suffered because the car bogged coming off the two step.
more boost is cool, but better launches is the goal.
my timing is around 3-6* and my fuel is 10.5 (cells 120-160 @6k), boost builds fast (10-12.5 psi). I come out the whole pretty hard best 60ft 1.58 and average 1.60-1.66. On the streets I spin thru first gear thats on 255 NS1's.
I have done this to some of my customers that love drag racing and they notice the difference as well. I will stress dont stay in it long.
I havnt retarded the timing any further than that and the riches it been as well.
Just sharing a good experience
Last edited by bnice01; Oct 16, 2007 at 01:35 PM.
