Any one done any of the 3794or 68 stg2 version
**CHALLENGE** - TURBO LAG TEST using a log
- Thread starter coker6303
- Start date
I will have to find the time and do this... Currently PPEI tuned but been thinking of giving Mark a try, may have to due it twice and get on the rollers for a true comparison. Also need to lean how to use my V-2 for some data logging....
Is there any good V-2 data logging how-tos for the computer illiterate????
I would really like to be able to provide the information needed for a tuner to be able to give me the best tunes specifically for my truck...
Is there any good V-2 data logging how-tos for the computer illiterate????
I would really like to be able to provide the information needed for a tuner to be able to give me the best tunes specifically for my truck...
Mark did the 3794 a few pages back. The 68 I don't believe is in this thread but it may be. I know it's posted somewhere on the board though from mark
I hope that I did this right 
Lb7 p/polished stock* w/ cast S475
Temp 45*
Elevation Sea Level
Tires 265/75/16 on PYO
Goerend DK
12mm Cp3
65 over injectors
*Stock is not my orig IHI. It's a cheap Chinese stock replacement turbo and comes with a 10blade compressor wheel. I think P/P stock IHI 11 blade should perform better in this spool test.
Standing 0-20psi: Not enough resolution in EFI Live to stop the log at 20psi. I stopped at 21.3psi. and 2.4 seconds elapsed. If I log to the prior frame, it's 18.2psi and happened in 2.2. Call it standing 0-20psi 2.3sec?
Crazy thing is that for .445secs the truck did nothing. I was in 4wd stopped and facing uphill and just floored it - no easing in. It belched a huge black cloud and after that 1/2 a sec it took off slowly but then just RIPPED! LOL. Maybe I could have done better without a throttle mash?
1500rpm locked in 5th. 0 to 22.2psi = 2.8 sec. 0-19.7psi was 2.7sec. I am posting both to be fair. Call it rolling 0-20psi 2.75sec?
I could have used a little more initial throttle but overall I think I got this one pretty good.
Recent dialing in of the wastegate made this SO much better than it would have been a few months ago, LOL.
Lb7 p/polished stock* w/ cast S475
Temp 45*
Elevation Sea Level
Tires 265/75/16 on PYO
Goerend DK
12mm Cp3
65 over injectors
*Stock is not my orig IHI. It's a cheap Chinese stock replacement turbo and comes with a 10blade compressor wheel. I think P/P stock IHI 11 blade should perform better in this spool test.
Standing 0-20psi: Not enough resolution in EFI Live to stop the log at 20psi. I stopped at 21.3psi. and 2.4 seconds elapsed. If I log to the prior frame, it's 18.2psi and happened in 2.2. Call it standing 0-20psi 2.3sec?
Crazy thing is that for .445secs the truck did nothing. I was in 4wd stopped and facing uphill and just floored it - no easing in. It belched a huge black cloud and after that 1/2 a sec it took off slowly but then just RIPPED! LOL. Maybe I could have done better without a throttle mash?
1500rpm locked in 5th. 0 to 22.2psi = 2.8 sec. 0-19.7psi was 2.7sec. I am posting both to be fair. Call it rolling 0-20psi 2.75sec?
I could have used a little more initial throttle but overall I think I got this one pretty good.
Recent dialing in of the wastegate made this SO much better than it would have been a few months ago, LOL.
Attachments
What are you running for timing when you stab the throttle and it smokes a lot with that short delay you described? Maybe add a degree or twoI hope that I did this right
Lb7 p/polished stock* w/ cast S475
Temp 45*
Elevation Sea Level
Tires 265/75/16 on PYO
Goerend DK
12mm Cp3
65 over injectors
*Stock is not my orig IHI. It's a cheap Chinese stock replacement turbo and comes with a 10blade compressor wheel. I think P/P stock IHI 11 blade should perform better in this spool test.
Standing 0-20psi: Not enough resolution in EFI Live to stop the log at 20psi. I stopped at 21.3psi. and 2.4 seconds elapsed. If I log to the prior frame, it's 18.2psi and happened in 2.2. Call it standing 0-20psi 2.3sec?
Crazy thing is that for .445secs the truck did nothing. I was in 4wd stopped and facing uphill and just floored it - no easing in. It belched a huge black cloud and after that 1/2 a sec it took off slowly but then just RIPPED! LOL. Maybe I could have done better without a throttle mash?
1500rpm locked in 5th. 0 to 22.2psi = 2.8 sec. 0-19.7psi was 2.7sec. I am posting both to be fair. Call it rolling 0-20psi 2.75sec?
I could have used a little more initial throttle but overall I think I got this one pretty good.
Recent dialing in of the wastegate made this SO much better than it would have been a few months ago, LOL.
No you did it right unless you are not monitoring psig. Looks like you are
I lied, apparently my tired eyes looked at the wrong line. You are reading psia. So 14.5 psi is actually 0 psig. So you want to hit 35psia to complete the test
Sorry for the screwups this morning. This screen shot is 2 logs side by side. On the left is today. Bullseye wheel in the S475. Temps are 65F vs 45F. Same road. The comparison shows the right side is faster to spool. That's the stock cast wheel in the S475 and lower ambient temp. Because of the lack of resolution, the cast wheel is actually producing a little more boost, because the bullseye test's next frame would have gone up 2lbs of boost. So I stopped them as close as I could.
If we don't consider the temp difference, then it's a win to the cast wheel. If 20 degrees more temp would have slowed the stock wheel... well, then it's too close for me to call. Seat of the pants in mixed use and egts - the win goes to Bullseye.
Not sure if I can get a clean 5th gear with this morning's data. Working on the next comparison.
If we don't consider the temp difference, then it's a win to the cast wheel. If 20 degrees more temp would have slowed the stock wheel... well, then it's too close for me to call. Seat of the pants in mixed use and egts - the win goes to Bullseye.
Not sure if I can get a clean 5th gear with this morning's data. Working on the next comparison.
Attachments
5th gear test. Again, as close as I can get. Left side is today with Bullseye wheel in the S475, and the right was last year. Stock cast wheel is faster, but I can't say if it's a temp thing. I also may have loaded better last year with more throttle position. For my own S&G I might look through the data and see if I can take this further out and see if the comparison changes.
Attachments
Realistically, the stock turbo is more of the gate keeper here than the 475. Specially with just the slight differences your seeing.
The wheel should make up for it on the top end lol
The wheel should make up for it on the top end lol
The 20deg temp swing is doing more here than anything.
The Bullseye wheel is lighter but should be lower blade count than the OEM Borg wheel which will always move less air at lower shaft speeds but excel at mid/high end of shaft speed.
Personally, I think single plane wheels are the GOAT for compound turbos that don't get pushed very hard (IE this scenario). They're in a higher efficiency zone on the compressor map compared to dual plane wheels.
That said, I don't think I'd go changing my turbo back to the cast wheel after spending the coin on the wheel upgrade due to how minor the differences are like @Chevy1925 pointed out.
Youd see better gains modding the stock turbo than fucking with the big turbo. Just aint fun to pull in and out
My “stock” turbo is a house branded XDP stock replacement, but it has 1 less blade on the compressor vs OEM. It is ported and polished.
I went back through all pages of this thread for like the 100th time, lol. I think that with the super short windows that we are considering, the operator could make a lot of difference in the results. But, going back to back on your own data after a change is very good. I’m thinking based on Russel’s data with the IHI testing, I could gain back my lost lag time with a stock compressor wheel put in the valley. But, with the current setup shes a real ripper. I don’t know if it’s worth the PITA. HAHA. My back is killing me today from tidying up some engine bay items last night
Oh, and I did see where Coker had gains in this thread by going BMW on his atmo turbo with his compound kit. Interesting. He had an s300 in the valley though.
All in all, my lag times even with the bullseye wheel are damn good. It’s disappointing that it’s worse than before, but with a colder day and a fresh filter and a sacrificed chicken, I’ll try again. lol.
I went back through all pages of this thread for like the 100th time, lol. I think that with the super short windows that we are considering, the operator could make a lot of difference in the results. But, going back to back on your own data after a change is very good. I’m thinking based on Russel’s data with the IHI testing, I could gain back my lost lag time with a stock compressor wheel put in the valley. But, with the current setup shes a real ripper. I don’t know if it’s worth the PITA. HAHA. My back is killing me today from tidying up some engine bay items last night
Oh, and I did see where Coker had gains in this thread by going BMW on his atmo turbo with his compound kit. Interesting. He had an s300 in the valley though.
All in all, my lag times even with the bullseye wheel are damn good. It’s disappointing that it’s worse than before, but with a colder day and a fresh filter and a sacrificed chicken, I’ll try again. lol.