Really? E85 usually makes for better spool. I was much closer to the surgeline on the stock turbo after switching to E85. In my experience, anything over 12.5:1 starts to feel progressively softer. 12:1 should be as good as anything. You could try working your way down to 11:1 to see if it gets you anything.

 

yes why would you ask this after i already pm'ed you with your answer? 12.8-12.5 in my experience spools the turbo the quickest on e85. theres a trick to tuning for spool also.. you dont keep tuning for spool until the last minute, you stop tuning for spool around 6-8lbs of boost is built then richen it up.

 

Fred his cars screwed up.. he PM'ed me and explained his situation. he said his tuner couldnt boost past 26psi on his fp black and that the turbo wouldn't take anymore boost lol. something is seriously wrong with his car. my money would be on the wastegate actuator preload.

 

Fred heres what he pm'ed me - Tonba if you dont want this public then ill remove it, but if Fred wants to help you fix your issue its best he sees this:

 

Yeah, sounds like WGA preload.

 

^ Will have a play with it then do a road tune.. Thanks guys!

 

so does break up happen at partial throttle? it is getting colder outside and with a warm motor not at operation temps.. i would get a missfire (or break up) in boost but will run fine when the motor is all warm up at normal temps. i think there is a tuning issue. i m doing it myself with no dyno and running e85. i thought about using the map tracer function on evoscan but i m not quite sure how to use it.

 

Yes, at part throttle in boost I would get break up. If its breaking up while in vacuum, there is something else happening, maybe just not a sufficiently warm motor.

 

@mrfred is there anyway of fixing the break up? and will it do harm if to my motor?i dont have break up in vacuum. if u can look at my map that would be great.

 

great info in here

 

My notes on E98 from the drag car - all numbers are on a gas scale:

Spoolup during a brake torque (automatic trans)
Misfire lean limit = 12.5:1 range
Similar spoolup throughout the 10-12:1 range
Considerably better spoolup at 8-9:1 AFR
Worse spoolup and inconsistent firing at 7:1 AFR

Knock Limit vs AFR - gauged by old school plug reading under a microscope and looking for piston bits (aka - pepper)
9:1 AFR - a complete knock train wreck - peak timing for no knock at 30psi = 4deg at 8k
11.5:1 AFR - much happier - peak timing at 13deg
Power increased by about 9% with the AFR change and then after the timing change the power was up about 35% from the 9:1 AFR tune.

Kevin

 

That is interesting, wonder if a spool up under 10:1 is as quick for pump gas

 

Great info. The improved spoolup at very rich AFRs is interesting, but I wonder how that is implemented in a practical way. Seems like it would have to be a change to the acceleration enrichment settings on an Evo ECU. The problem there is that accel enrichment only works up to 160 load.

 

The spoolup at rich afr's is as-expected. Going from 11.5:1 down to 8:1 is about 5-6% increase in mass flow. This should approximately scale spoolup rpm. The interesting thing is since the testing was with an automatic it also has power loss due to being richer in the test. Richer here still consistently won out on a whole system performance level.

This could easily be implemented on a tune during spoolup. Target boost of 25psi would just be set very rich in the 2-15psi range. The downsides are knock and blowby. If this is done only in the low boost range knock probably isn't an issue. I saw a lot more stuff in the catch can during rich dyno pulls. It polluted the oil quicker and also made more water vapor, blowby disgustingness, and steam into the can each pull. This may not be an issue if it is only a transitional part of the map though. I opted not to implement it on my car's tune at the moment, but it is behavior worth noting. The main point is, even off-scale rich on most wideband sensors will only be a minor power impact as long as your particular application is not knock limited. This rich doesn't work at all power-wise on gas.

Kevin