[ZuMBLe]

Does anyone have any advice on tuning tip in for "740cc" injectors? Was hoping to cut down on tuning time for these since it's a basemap change.

[sti752]

Cobb posted some recommended values for JEC/NISMO 720/740cc injectors. You can find them on COBB's forum under the sti street tuner section. I am using those for now. I need to find a way to fix my fuel injector Boost trim error as we cannot adjust this in Street Tuner.

[ZuMBLe]

COOL! I will look for those. Thanks!

Originally Posted by sti752

Cobb posted some recommended values for JEC/NISMO 720/740cc injectors. You can find them on COBB's forum under the sti street tuner section. I am using those for now. I need to find a way to fix my fuel injector Boost trim error as we cannot adjust this in Street Tuner.

[WolfPlayer]

My main problem is that I need access to more tables to be able to effectively tune tip in I can watch my wideband and on tip-in the AFR goes rich but then it immediately swings lean I can't feel this when driving. It feels fine. But, the data bugs me. I have modified the tip-in to be almost double the stock values and I still get the lean spike after the large rich spike on tip in. Fact of the matter is that there exists a tip-in decay table. This describes how long the tip-in remains in affect. An algorithm is used to determine the rate of tip-in removal. I need to increase the lenght of time that tip-in is in effect. I have the APS 70mm CAI so that is part of the issue. However, I think others will see this same phenomena if you look closely.

t

[ZuMBLe]

http://www.cobbforums.com/forums/showthread.php?t=31225

Could someone please download the FP20G map from that link then copy the tip in table from that and paste it here for me? I have a FXT so my ST won't open the STi files.. =(


As for the tip in tuning problems, I see it now also. Even though my tip in tables are stock I see the AFRs go really rich then it goes really lean. Hopefully in the next update of ST the needed tables will be released.

[R4ND0M_AX3]

What about the other tip-in like table (Fuel Injector Boost Error Trim) that references rate of change in MAP? Christian talks about it in his tuning guide but I don't see it in ST. Could that be giving you guys trouble?

[sti752]

Zumble,
Sorry it took me so long but here is the tip-in data from the 20g map using JEC 740cc injectors. Sorry about the awkward format but it'll have to do. Hope it helps.

TPS Delta:
0.00-0.98-1.95-3.91-5.86-7.81-9.77-11.70-13.70-15.60-17.60-19.50-21.50-23.40-25.40-27.30-29.30-31.30

Tip in enrichment:
106-121-134-221-303-387-464-535-603-630-659-729-798-858-946-1034-1121-1208

[ZuMBLe]

Definitely helps! Every little bit helps! I'm going to start whipping up a new basemap now. Thank you!

Originally Posted by sti752

Zumble,
Sorry it took me so long but here is the tip-in data from the 20g map using JEC 740cc injectors. Sorry about the awkward format but it'll have to do. Hope it helps.

TPS Delta:
0.00-0.98-1.95-3.91-5.86-7.81-9.77-11.70-13.70-15.60-17.60-19.50-21.50-23.40-25.40-27.30-29.30-31.30

Tip in enrichment:
106-121-134-221-303-387-464-535-603-630-659-729-798-858-946-1034-1121-1208

[ride5000]

Originally Posted by WolfPlayer

My main problem is that I need access to more tables to be able to effectively tune tip in I can watch my wideband and on tip-in the AFR goes rich but then it immediately swings lean I can't feel this when driving. It feels fine. But, the data bugs me. I have modified the tip-in to be almost double the stock values and I still get the lean spike after the large rich spike on tip in. Fact of the matter is that there exists a tip-in decay table. This describes how long the tip-in remains in affect. An algorithm is used to determine the rate of tip-in removal. I need to increase the lenght of time that tip-in is in effect. I have the APS 70mm CAI so that is part of the issue. However, I think others will see this same phenomena if you look closely.

t

are you sure you're not overfueling via the enrichment and causing the stft to compensate?

[RainMaker]

Originally Posted by ride5000

are you sure you're not overfueling via the enrichment and causing the stft to compensate?

I'm almost sure he is. I increased tip-in and when I went to far, the car would hit rich and then rebound to lean. Since I cant dampen that at the moment, I need to try and find the ultimate "impulse" value that puts it right without creating a reaction.

The problem also is that as far as I can tell there is the single dimension of TP delta... but I think there is a temperature based dimension out there too, since my car definitely has tip-in issues for the first 3-5 minutes of driving that are absent after that.

[RainMaker]

I use the JECS 720s... That may be the same as the injectors you are using.

my values...

106-121-134-221-303-387-464-535-603-683-763-844-924-993-1096-1197-1298-1399

Though I am going to try another 10% below 603. I use a blow-through MAF, fwiw.

[daemon]

Originally Posted by RainMaker

but I think there is a temperature based dimension out there too, since my car definitely has tip-in issues for the first 3-5 minutes of driving that are absent after that.

The ECU does indeed add fuel when the engine is cold.

[WolfPlayer]

Originally Posted by ride5000

are you sure you're not overfueling via the enrichment and causing the stft to compensate?

Sweet. I never thought about it like this. Thanks a bunch. I'll flash a new map tonight and verify.

t

[RiftsWRX]

Originally Posted by RainMaker

I use the JECS 720s... That may be the same as the injectors you are using.

my values...

106-121-134-221-303-387-464-535-603-683-763-844-924-993-1096-1197-1298-1399

Though I am going to try another 10% below 603. I use a blow-through MAF, fwiw.

What's interesting is the highend of your listing.

Granted, it's a blow through setup. But, typically on a JECS/NISMO injector, you have a trend where the light TPS deltas need extra fuel, and the higher deltas need significantly less (if not you see massive enrichments suddenly tipping into WOT).

[WolfPlayer]

Originally Posted by RiftsWRX

What's interesting is the highend of your listing.

Granted, it's a blow through setup. But, typically on a JECS/NISMO injector, you have a trend where the light TPS deltas need extra fuel, and the higher deltas need significantly less (if not you see massive enrichments suddenly tipping into WOT).

I've done a couple base maps tonight based off of Ride's advice. I immediately converted back to a stock TPS AE map and started over. On my JECS, my light TPS deltas needed a little extra fuel and my higher deltas needed more fuel too. I know that Daemon on this board ended up giving the higher deltas more fuel too. I remember trying less fuel awhile ago after downloading one of your maps and looking at what you ended up with for the JECS values. I tried those way back then and they didn't work for me - a direct lean spike when cracking the blades wide open. But, I am also using a lower scalar (3700) whereas you used a higher one (4000 IIRC). Cobbs scalar for these injectors is even slightly lower (36XX). I'm also using an injector boost error comp map that is 70% of stock. I'll continue to log with my newest map and report back. With Ride's advice I immediately got rid of the rich-to-lean spiking (not that the car felt any different - but I felt better because the logs looked better - roflmao).

t