I just finished up installing my SMC kit, and I planned on running 100% denatured alcohol. I've also just installed a walbro fuel pump, hks 280 cams, and arp headstuds. Got the car on the dyno for a tune last night and ended up only being able to run 24.5psi (peak) tapering to about 20psi at redline. Any more boost resulted in knock, and pulled timing. I'm running their standard 7gph nozzle, and the only thing I can think that would be causing weirdness is the temperature. It was -1 outside last night, 17 degrees (F) in the dyno bay. Does denatured alcohol not behave as well as meth when it's super cold out?

The car made good power, picked up 40whp and 44lb-ft on my previous setup...in some areas we saw an increase of over 50whp! Of course, this is neither here nor there because I was hoping to run a little more boost (26psi).

Here's what's in the tank right now:


I watched the pressure gauge on the dyno and the alky kit is spraying a full 100psi all the way to redline. These numbers are on a Dyno Dynamics dyno at DB Performance here in MN.
(click for high res pics)








Thoughts?

 

What plugs are you running. I am running one step colder then factory. I think that they are the IW24. I think that it is the same heat range as the BPR7ES copper plug. I run 50% Meth and 50% Distilled Water. I really don't think that you are going to see much difference from 24 psi to 26. Maybe four horse power. Anything over 24 to 25 psi the stock turbo starts to generate a lot more heat which in my opinion would help generate more knock. Maybe you should give the 20g-LT turbo through Buschur a try. They seem to preform a whole lot better at high boost. My 2 cents.

Cameron

 

Also the Stock intercooler get Heat Soak

 

I am running a fresh set of BPR7ES plugs and I also am running the full BR deluxe FMIC setup.

 

I am running the same alky and kit as you and had no issues. I am running the Evo 9 turbo and HKS 272 cams but I put down over 370 hp and 370 trq at Torquefreaks on their Mustang Dyno boosting 28psi.

 

^ Torque Freaks has a dynojet.

 

try running 8 series plugs and get some sort of ignition amplifier, you are likely blowing spark out...also what were you gapping them at?

 

I realize now that we were getting knock at higher boost just before we started seeing random misfires. Power started dropping, so we swapped out the spark plugs for a new set of BPR7ES...we didn't have any BPR8ES's available last night ~10:30pm. After putting in the new 7's the car ran awesome and we just left it at 24.5psi. These were gapped at .26.

I'll find some 8's, gap them, and then turn the boost up a bit and see if I still see knock. Thanks for the help guys!

 

Really?? why did I think it was a mustang..

 

I have no idea why either. I was confused for a sec when I read your post.

 

was the car knocking all over or just in particular rpms?

 

I'm not positive, but I think it was throughout the powerband.

 

So, an update. First off, the car is solid, and has been since it left DB. I took s2kracka and m3guy for a spin the other night, I'm sure they can attest to its gutsyness. No it does not have 500whp, but DAMN it is fun to drive like this! The car seems to just jump ahead of anything else on the street, and with the ACD in 'Tarmac' mode, the rear end is squirrelly with just me in the car. I swapped out the fresh set of BPR7ES plugs gapped at .026" with some BPR8ES plugs gapped at .022" based on what I have read others use w/ alky. The car feels about the same at 24.5psi, no change.

I picked up an openport cable to do some logging with, and found some interesting results. Bumping up the boost about an 1/8 turn on my MBC looks like it brings peak boost up to an even 25psi and all is stable/dandy (knock count in the 1-2 range). If I do a run through the gears from first or second up to about 80 or 100mph, 0 knock, clean as a whistle every time. If I do a third or 4th gear pull, that is when I see a bit of knock, and it's only at boost onset.

If I bump it up a little more to 26, knock count rises. It's probably at a safe level, but it's higher than I want it to be (knock count in the 5-8 range). This is where I'd like the car to be, and it should be able to be leaned out a bit (current afr's are 11.2:1, see my other thread). At this boost level, IDC's hit 93% at 7300rpms, so I am not running out of fuel on my stock injetors.

If I crank the boost goes up further to 27-28psi, knock count goes up to 11-12 and the car even hit fuel cut once (or boost cut, not sure if there is a difference).

So, I'd like to be at 26psi with 0 knock, maybe 1-2 like I am at now, but I'm not sure what exactly is holding me back. There are people all over evom claiming to be running my exact setup with denatured alcohol and running 26psi no problem. Now, maybe they haven't logged their car and get a little knock at that boost level, I'm not sure. At this point, the only thing I can think to try is to swap out the alky for meth, or a 50/50 meth mix w/ H2O. The thing is, chemically they are so close there shouldn't really be much of a difference.

Does anyone have any input?

 

Here's a good example log @ ~26psi:

RPM TPS Airflow KnockCt TimingAdv
3937.5 100 1239.13 6 -2
4093.75 100 1302.03 6 -2
4281.25 100 1333.48 5 0
4437.5 100 1346.06 5 0
4625 100 1415.25 5 0
4781.25 100 1522.18 4 1
5000 100 1547.34 4 1
5156.25 100 1603.95 4 1
5312.5 100 1603.95 4 2
5500 100 1603.95 3 3
5687.5 100 1603.95 3 4
5812.5 100 1603.95 3 5
5968.75 100 1603.95 3 7
6156.25 100 1603.95 2 9
6343.75 100 1603.95 2 9
6437.5 100 1603.95 2 10
6593.75 100 1603.95 2 12
6750 100 1603.95 1 14
6906.25 100 1603.95 1 15
7031.25 100 1603.95 1 15
7156.25 100 1603.95 1 15
7312.5 100 1603.95 0 16
7437.5 100 1603.95 1 15

 

What you experience is what others running progressive pump speed injection experience too

https://www.evolutionm.net/forums/sh...d.php?t=185062

The reaction speed of injection is too slow, injecting too little when most needed and injecting too much when not needed

https://www.evolutionm.net/forums/sh...7&postcount=12