0 PSI.. Rudy is doing some magic for my SLK.

Last boost it was at was peak 16-17psi before I started running into issues. Once you start doing the mods I had, I really should have gotten a tune and never did. Bad idea.

On topic, I will not just be rolling but also pulling the fenders. It will have enough clearance, I was running 275s and it was just barely scraping. Scraping only on bumps or hard acceleration. Hope to see more updates from this!

 

Matt
THANK YOU for figuring all this out & sharing it!
I just drove my car with the stacked pulleys and WOW! Its finally the car I wanted.
I set the rail psi to 60 & data logged a couple of 2nd gear pulls.
I was wondering if you think I might be a little rich & should drop the fuel psi?
In 2nd gear at 5400 rpm & 22.3 psi boost my afr is 11.1
At 6100 rpm & 21 psi boost my afr is 10.7

Next project is to install my killer chiller which will take a bit of tinkering

Barry

 

Hi Barry,

This sounds really good. I have just ordered the killer chiller kit from Joe and Will hopefully install it within two weeks. Ler me know how the installation went for you. I Will try to make a Good DIY with pictures and all.

Nice boost Numbers you have there. I'm running the 61mm from EC and see 19.8PSI on 6100rpm. Think that going stacked Would be to much.

Have a nice one

/Adam

 

You are welcome!!

This is a good community, so I try share what I attempt and learn, as others do also.

The TORQUE with the stacked pulleys is awesome, isn't it? I have a new dyno sheet that I will post.

I do think you are running a little too rich. I would rather be to rich than too lean for security, but you would make more power and still be safe if you were seeing the low 11 AFRs at redline, and and mid 11 AFRs lower than that. 12.0 AFR would not even worry me in 2nd gear at mid RPMs.

 

I dyno'd again at Timmayfest last weekend. No new mods, but the tune has had time to make long term adjustments.

Alomst identical results: 409 RWHP and 415 RWTQ.

Look at that torque curve! Or lack of curve.

dyno6-6-2014TimmayfestW676_zps82bf8419.jpg

 

loks good matt. just need a driver mod now for the new found power!

 

I will be going back to the dyno when I get my killer chiller setup.
And dial in my fuel a bit more.
Awesome numbers

Barry

 

Great job designing your fuel system and getting big #'s safely. Thank you for sharing your experiences and data.

 

Can you still daily drive safely with stacked?

 

Yes. I put a lot of miles on it. Sticky tires (Bridgestone RE-11A) go a long way to putting the power down without sliding around. I do not intentionally drive it in bad weather though. I have another vehicle for that.

 

Yea see i only have one vehicle..so it would have to stay 100% reliable. Im afraid stacking would hurt reliablity alot...

 

I just wanted to let anyone interested know that, that I dailed the fuel psi down to 58 psi at the rail.
then did a couple of 3rd gear pulls & my afr was between 11.8 & 12.0
going to leave it at that. Not going to put in the killer chiller to next winter, but the local track that has been closed for repairs for repairs is going to open up again so hoping to get some runs in.
would like some advice on launch rpms
thanks
Barry

 

I am interested. Great AFRs! At the factory pressure too. I would leave it right there.

I have great success launching at 1400 rpm. Much higher and I risk two things: overcoming the brakes and inching forward in the beams (red light waiting to happen) or overwhelming the rear tires on green. With the drag radials, -0.6 degrees rear camber, and a wavetrac diff, I can usually stick full throttle launches from 1400 rpm and pull a1.7 60' time.

If you are bracket racing: launch rpm affects reaction time!

 

Thanks Mattt
I bought a set of mickey thompson 16in drag radials & the wavetrac so the BIG Question will be my lack of tree experience.

 

good info barry! I didn't see a modified fuel rail in your sig....is that not required to stack pulleys?

 

[QUOTE=boostmonkey;807249]I am interested. Great AFRs! At the factory pressure too. I would leave it right there.


I think the factory pressure was 54, I read 58 at the rail with the regulator set at 66 and my AFR's are in the same range.

 

No my fuel rails stock

 

Went racing the other night
A lot of fun but my times were not that good. first run was in the 13 sec because I think I ramped the throttle up too high just before I let off the brake and the supercharger cut out.
next two rounds were both 12.6
I tried launching at idile, and launching at about 1200 Rpm
problem was traction off-line.
my drag radials are brand-new and not heat cycled although I did do a burnout before each run. tried as low as 15 psi
but still serious slippage.
first Time down track so I have lots to learn on launching.
car got a Lot of attention
crowd around it after every run people taking pictures lots of questions. not .com here most people haven't seen one rundown the track
Barry

 

That is some disappointing times but I feel u will get better the more u go down the track , what's ur elevation and where u located at ...did u run street tire and what size if u did. Did u have a boost gauge and if so how much boost was u pushing with that stacked set up lol I'm sure with all the brains on this post they will have u into the 11sec club in no time

 

Running mt 16in drag radials & the boost is not a problem, 22-23 psi
unfortunately my dashdaq card didnt log my runs.
If it is not rained out going again on the 29th.
One big problem is you get stuck in a long line waiting to stage & the car heat soaks, plus it was about 80 degrees outside. When I put my killer chiller in this winter it will fix that problem.
And I wanted to do some runs without it to see the difference.
Barry