[laynlo15]

Originally Posted by Joshinator99

Hmmm…where have I heard that before…?



I saw that too…bit lean on a SBE for my tastes…

If you look at that graph it gets lean above 6400, that was on me for taking it to past the shift points. I did one pull to 6700 accidently. My car shifts at 6350 so we are good to there, just didn't get my foot off the pedal early enough.

[KingLT1]

Originally Posted by laynlo15

At the tailpipe, log was between 12.5 12.7 on HPT. Once they change to winter blend it will probably between 50 and 60 so you'll get your wish. We have more flex fuel timing and less base timing so if it goes down timing goes down.

The last graph where it made 707 it's 12.8-13.0 almost the entire pull. The graph where it made 677 it was richer..12.5-12.7. I am guessing you get a richer reading on your wideband in the car?

Yes, that is how flex fuel tuning is supposed to work...only difference is I give mine the same timing from E50 on up. Below that timing will decrease.

[laynlo15]

Originally Posted by KingLT1

The last graph where it made 707 it's 12.8-13.0 almost the entire pull. The graph where it made 677 it was richer..12.5-12.7. I am guessing you get a richer reading on your wideband in the car?

Yes, that is how flex fuel tuning is supposed to work...only difference is I give mine the same timing from E50 on up. Below that timing will decrease.

Yes the wideband is showing 12.5 to 12.7. So we straighten this out, what happens on the dyno is no relation to the track. I looked at my 10.34@135 pass and I went thru the traps in 6th gear at 5900 rpms. Each shift was below where it got the leanest on the graph and each shift was around 6330 to 6370 so on the big end according to the wide band we should be just about 12.5. On the log at 5900 it was 12.53 which is about where I should crossing the 1320 stripe this weekend. I hope that helps so everyone is not thinking we are too lean, don't relate the tailpipe to the wide band since thats 8 ft past the AEM bung.

[Trochoidal]

Originally Posted by laynlo15

Thanks Josh, we are officially done FOR NOW!

Originally Posted by Joshinator99

Hmmm…where have I heard that before…?

There was a typo in there!

Great job getting ready for the next pass. That “LT1” trim is going to move out good.

I’d like to see a video of you and cjperformance @ the track together.

[laynlo15]

Originally Posted by Trochoidal

There was a typo in there!

Great job getting ready for the next pass. That “LT1” trim is going to move out good.

I’d like to see a video of you and cjperformance @ the track together.

He can be there, just 25 minutes for him and 2.5 hours for me. I'd be there every weekend if I lived 25 minutes from the track, but we all look at drag racing differently. I hope he gets his in the 10s next time out, he has the tires finally to hook the power up. Just gotta roll into the water box and stage it and let er eat. I ordered a complete drag pack today, should be here by Thursday. They are RC components 17x4.5 and 17x10 RC street fighter Bandits. Just couldn't take the chance breaking something with these hard ass drag radials. Also ordered 27x4.5-17 MT front runner (bias ply) and 28x10-17 Hoosier slicks. Should save me almost 100 lbs. I plan on running the 9 second pass this weekend. Lets see if we can make that happen, new trailer should be here tomorrow or Wednesday. Its built and the dealer should be picking it up in the morning.

[Trochoidal]

Originally Posted by laynlo15

He can be there, just 25 minutes for him and 2.5 hours for me. I'd be there every weekend if I lived 25 minutes from the track, but we all look at drag racing differently. I hope he gets his in the 10s next time out, he has the tires finally to hook the power up. Just gotta roll into the water box and stage it and let er eat. I ordered a complete drag pack today, should be here by Thursday. They are RC components 17x4.5 and 17x10 RC street fighter Bandits. Just couldn't take the chance breaking something with these hard ass drag radials. Also ordered 27x4.5-17 MT front runner (bias ply) and 28x10-17 Hoosier slicks. Should save me almost 100 lbs.

RC drag pack has a good price, look good and don’t weigh a lot. That rotating rate reduction is going to help too. Let it rip!

[laynlo15]

Originally Posted by Trochoidal

RC drag pack has a good price, look good and don’t weigh a lot. That rotating rate reduction is going to help too. Let it rip!

15.8 lbs on the front wheels and 12 lbs on the tires. Stock fronts are 58 lbs
19.5 lbs on the rear wheels and 23 lbs for the slicks. Stock 9.5 with drag radials is 62 lbs, just about 98 lbs of rotating weight savings. So a decent savings. Should be able to get the Hoosiers to hook, maybe a 1.40 60ft will help a lot, so no guarantees I'll get there but less weight and 75 more hp and 110 lbs more torque than Ls Fest it could happen.

[laynlo15]

I may regret this prediction but I'm going to run 9.96@140 w/1.39 60ft.

[asthmamax11]

Awesome #'s
Interesting data of how much DI vs PI is providing fueling

Fingers crossed weather is nice for the trackday

[toohighpsi]

Originally Posted by cjperformance

Are you intentionally running E66 or maybe that is what came out of the pump? If you are mixing down was just wondering if there was a reason.

Also does the port inj have an input for eth content too? In other words, does the port system change fuel delivery based on on E content too, or is that all accounted for in the DI tune?

66% is all that Greg gets from the pump in Missouri.

The Reflex controller reads flex content directly from the CAN bus and adjusts fueling accordingly just like the E92 does so there's no tuning necessary as E content changes. At LS fest Greg had about 76% content in the tank as the pump there was right at 80%.

I like to get the tune set right at 80% content so we know that the low side fuel system would be able to keep up, but that not always possible.

[toohighpsi]

Originally Posted by KingLT1

The last graph where it made 707 it's 12.8-13.0 almost the entire pull. The graph where it made 677 it was richer..12.5-12.7. I am guessing you get a richer reading on your wideband in the car?

King, see attached screen shot, you are correct, the in-car WB (just after the primary cat and before the secondary cat) was at 12.6 on the 707 pull, we probably could have made 710+ leaning to 12.8, but were content with this number and we were more focused on making sure that the knock hit at 6400 wasn't real. There weren't any signs in the data that the knock was real so we pulled 3 degrees at the top and pulled again to verify and the knock repeated, giving us a better feeling that it's not real. It's also above the shift point so we won't worry about making any changes until till we see data from the track.

I will agree with you on lower alcohol content and the ability to make power, but the one benefit of running as much E as possible (80%) is the safety margin that it gives you. Even having an engine run all the way to stoich under boost will normally not induce detonation with full E85, so you normally can sweep both fuel and spark right through peak power without worrying about detonation creeping in on you. With the LT1, on port and a high E content we don't really have to worry about the tune being on the edge, we have to worry about passing the mechanical strength of the stock LT1 components (pistons) which normally have a tough time surviving above 750 RWHP so we'll try to keep a bit of distance from there.

[laynlo15]

Originally Posted by toohighpsi

King, see attached screen shot, you are correct, the in-car WB (just after the primary cat and before the secondary cat) was at 12.6 on the 707 pull, we probably could have made 710+ leaning to 12.8, but were content with this number and we were more focused on making sure that the knock hit at 6400 wasn't real. There weren't any signs in the data that the knock was real so we pulled 3 degrees at the top and pulled again to verify and the knock repeated, giving us a better feeling that it's not real. It's also above the shift point so we won't worry about making any changes until till we see data from the track.

I will agree with you on lower alcohol content and the ability to make power, but the one benefit of running as much E as possible (80%) is the safety margin that it gives you. Even having an engine run all the way to stoich under boost will normally not induce detonation with full E85, so you normally can sweep both fuel and spark right through peak power without worrying about detonation creeping in on you. With the LT1, on port and a high E content we don't really have to worry about the tune being on the edge, we have to worry about passing the mechanical strength of the stock LT1 components (pistons) which normally have a tough time surviving above 750 RWHP so we'll try to keep a bit of distance from there.

Attachment 1111117

We made 770 on the stock Lt1 on my 16 SS on race fuel, meth, big bore pump, lt4 injectors and about 18 lbs of boost. We did suffer the consequences after about 50 passes or so. We were just pushing the stock Lt1 past its breaking point. Too much boost and not enough crank case ventilation put the hurt on a couple pistons. But remember that motor survived 180 pass, over 150 under boost and 12,500 miles so it was a pretty tough Lt1. One thing I have to say about Mike, he continued to warn me of the circumstances we'd face by continuing to raise the boost levels. That won't be the case with this motor, safety first not last. Thanks for chiming in Mike, appreciate it.

[KingLT1]

Originally Posted by toohighpsi

King, see attached screen shot, you are correct, the in-car WB (just after the primary cat and before the secondary cat) was at 12.6 on the 707 pull, we probably could have made 710+ leaning to 12.8, but were content with this number and we were more focused on making sure that the knock hit at 6400 wasn't real. There weren't any signs in the data that the knock was real so we pulled 3 degrees at the top and pulled again to verify and the knock repeated, giving us a better feeling that it's not real. It's also above the shift point so we won't worry about making any changes until till we see data from the track.

I will agree with you on lower alcohol content and the ability to make power, but the one benefit of running as much E as possible (80%) is the safety margin that it gives you. Even having an engine run all the way to stoich under boost will normally not induce detonation with full E85, so you normally can sweep both fuel and spark right through peak power without worrying about detonation creeping in on you. With the LT1, on port and a high E content we don't really have to worry about the tune being on the edge, we have to worry about passing the mechanical strength of the stock LT1 components (pistons) which normally have a tough time surviving above 750 RWHP so we'll try to keep a bit of distance from there.

Attachment 1111117

My understanding is that just because it's not knocking doesn't mean it's safe. Personally, I wouldn't run a tight ring gap with high dynamic compression that lean even on E. I am not saying you are wrong; it just goes against the grain from what I have learned. The good news is I am always willing to learn something new. So, I will keep this info in mind.

I am running E50-60, 10 psi, 19 degrees of timing, 12.2 AFR and trapping 136-137 full weight on 20's like Gregs car. My Injector pulsewidths are 5.2ms. If I had drop in pistons, I would be tempted to push the tune more on the edge, but I'll sit in the audience and cheer you guys on!

[laynlo15]

Originally Posted by KingLT1

My understanding is that just because it's not knocking doesn't mean it's safe. Personally, I wouldn't run a tight ring gap with high dynamic compression that lean even on E. I am not saying you are wrong; it just goes against the grain from what I have learned. The good news is I am always willing to learn something new. So, I will keep this info in mind.

I am running E50-60, 10 psi, 19 degrees of timing, 12.2 AFR and trapping 136-137 full weight on 20's like Gregs car. My Injector pulsewidths are 5.2ms. If I had drop in pistons, I would be tempted to push the tune more on the edge, but I'll sit in the audience and cheer you guys on!

Pop corn and beer is not bad at all.