Tim Murphy

Well, I finally got around to testing a new version of my Stage 3 kit this weekend with some cooperating weather and so far I am pleased with the results.

What I have done is basically take a Stage 2 kit (Stage 1 kit with an intercooler), add 42lb injectors, Super MAF, removed the FMU, custom chips via the Shark Tuner, with 7psi max boost (same pulley as on the Stage 2 but a 50 degree day added about 1 psi).

Through auto tuning and manual manipulation of the fuel charts I was able to get a pretty flat AFR curve which demonstrated I am able to totally take control of the fueling of the car. The car absolutely drives like a stock 928 in every aspect with the exception of having more power. It feels just like it did with the Stage 2 kit. The car runs 14.7:1 AFR while cruising and just a little over 11:1 while under full load. This might be a little richer than I will eventually have it setup but I want to be plenty safe for now because the next step is to increase the boost to around 9-10psi (same pulley I ran on my original Stage 2 kits). I was planning on running whatever boost it would take to get the car to 500rwhp but I am second guessing that decision, not because I'm concerned about the reliability of the car (I'm not) but my concern that the car may become unsafe to drive with too much power (This is my wife's car BTW). Jury is still out on my final decision.

Here is the data log from the testing I did this weekend. I will get the pulley changed out and the next good weather opportunity I will get it finished with the final configuration. I already have a current Murf928 customer who is going to transform his old Stage 2 version to the new Stage 3 version just to verify it can be duplicated on another car without any issues.

stuartph

Tim


Great work

hacker-pschorr

Well, she is the better driver in the Murf household

martin D

Don't you need to change your sig. line now Stuart

Jim R.

Looks good Tim-I guess I need to pad the Shark fund real soon!

Jim

Gretch

Yep, lemme have the bad news Tim......... How much 'shine am I gonna have to "part" with to get my Murph upgrade??????

SwayBar

Schwing!

AO

Tim, that's awesome work! You 'da man!

DonT

Here I go again, trying to keep up with Gretch... What size tires am I going to need?

PorKen

Second, lower power, LH/EZK maps via coding plug/key switch?

IcemanG17

Tim...nice work.....since its around the boost level of the old #2 kit....is it making about the same HP....or around 450whp.......which is still plenty alot....but the 12.1 1/4 speaks quite loudly!! The 500whp 10psi should be in in the mid 11's (if you run slicks)

Flott Leben

Tim,
Excellent news! I was really anticipating your progress with the SharkTuner and new chips and ditching the FMU. Gotta love that new AFR "curve." Well done and the best is still yet to come.

John Speake

Have you remapped the EZK yet Tim ?

Vilhuer

There is some gains to be found in EZK also as ST mule S4 shows.

Tim Murphy

I did.

The injectors I put in the car had been laying around for a few years and I was showing a consistent knock count on cylinder #2. I pretty much blame it on a dirty injector because when I first started the car I could get a knock count on cyl #2 just reving the engine. I pulled out enough timing across the board so I would only see an occasional knock on #2 and I left it that way. If figured if I goofed on the LH tuning I would have a little cushion to work by keeping this configuration for now. I can't remember how much timing I took out but it wasn't much.

I will do an initial tune on the LH first with the higher boost and then go back to the EZK and see where I'm at. I plan to final tune the car on a brake dyno to verify all my settings.