E85 guys what is your afr on spool. Will lean and high timing spool turbo faster or rich and low timing?? I was using race gas (c16) in the past and c16 love to spool lean I was 13.5-14.0 aft on spool. Doesnt look like e85 like the same afr on spool. What is your spool afr on e85?? Thanks!

 

mid 11's.
mid 12's out the top

 

Mid 11's on spool??? I am around 13.0 -13.5 afr before spool and 12.5 spool afr at around 15psi boost, 12.0 at 25psi boost and 11.5-11.7 full boost 35-37psi. I am trying to figure out the way to spool turbo faster. I have 6466 turbo and s3 cams I can see full boost on 4th gear at 5k rpm which is great but on 3rd gear it is 5700rpm and second gear 6700 rpm so first gear full boost is past 7k rpms which is crazy slow.

 

Looking at one of my data logs, I go from 12.8 at 2600rpm/0-5psi -> 12.5 at 3200rpm/12-13psi -> 11.8 at 3600rpm/28psi. I prefer to keep the car cool and safe VS max power since it has to survive all of this being driving at 100% for 20mins at a time.

 

I am wondering if adding timing on spool or retarding it will help in spool in my case. I heard that to spool faster you can lean it and add a lot of timing or make it rich and retard timing. I think I will try both methods and compare data loggers. My evo makes great power and spool on 3rd or 4th even on 2nd gear is pretty good but first gear is horrible. I know I have big turbo and big cams (gsc s3) but it must be the way to correct that spool at least by 300-400rpm. My full boost was almost 1,000rpm faster when I was on the same turbo but gsc s1 cams and race gas. I switched to s3 cams and e85 at the same time so I dont know if cams made that huge difference or tune or both hehe

 

I second these targets as safe/happy. Whether my tune actually nails these targets is another thing..

 

Timing helps, but then you risk detonation. Retarding timing definitely does not help. Cars build boost faster in taller gears because of load. You can't do anything about that; it's normal. Big turbo and cams are going to make driving in lower gears miserable. That's also normal. The bigger the cam, the more lag. S3s are meant for making power in the upper RPM range. E85 helps.
Basically, assuming you are on a 2L, You have a turbo rated at 900hp, you have a big cam, and you only have 2 liters to move it all. Your car is built to run from 5500-9k RPM and really move in 3rd, 4th, and 5th gears. If you don't have MIVEC it's even going to be worse.

 

Some old tuners say that retarding timing and richer afr on spool will make spool faster but taking hp . I will try both retard timing/richer afr and advance timing/leaner afr on spool and log the results.

 

Would a GSC R2 cam facilitate a faster spool by moving the torque curve to the "left"?

 

it makes extra heat which isn't great. Not sure how it would help spool... When I started building turbo cars, our kits came with FMUs which dumped a ton of fuel, then we would retard timing in order to prevent detonation (they were high comp Honda motors). The cars were lazy until we got them tuned properly. I'm no tuner, though, so if that's what they are telling you then go for it and see for yourself.
But, That's why all tunes start out with more timing and leaner AFR.

It would help a bit. Not sure if it would be enough to notice. You could always Google results to see how much of an improvement you would get.

 

Retard the timing is basically trying to get the "in burn" event to go to the turbine. This is complemented by LEANER AFR not richer. This is the "lean spool" in the Evo X ECU, in order to help spool up.