Abby Normal

Waiting on the dyno sheets via email so I will have to post those later.

Today we were on a Dyno-Dynamics and made 454RWHP and 490RWTQ on 12psi of boost. I have the numbers from my low boost setting of 8psi and those were (I can't remember exactly) about 394HP and 438TQ... I will post the sheets once I get them.

The tune is well dialed in after countless hours of Shark Tuning. The car returns to idle smoothly and has a clean cold start.. Considering I am using a S4 idle control valve on a early 32V ECU with S4 intake,,that's pretty darn amazing. It return to idle better than when the car was stock!

We are however at the limits of the ignition control system and also the fuel injector size we can use. Without knock sensors and the ability to run a bigger injector, among other limitations to the current system, I think we have squeezed the most power we can get. In addition we have the car tuned a little conservative for engine safety reasons. This engine can for sure handle more boost and would make more power with the right fuel and ignition systems. Because of these limitations and challenges for the early 32v cars, I highly suggest using the S4 platform for higher boost applications.

I truly cannot thank John Kuhn enough for his help in every phase of the build. In addition to developing an intercooler system, his commitment to helping me get the car sorted and tuned is the only reason the results are what they are. Without his expertise and involvement, the results would be nowhere close to what they are. I have spent a lot of time with John and can honestly say he is as thorough and meticulous as anyone I have ever met. If you are thinking of doing a turbo system on a 928 you will not find a better resource than John.

I'd also like to thank Jim Coman at Coman Performance in Alabama. After having rod bearing failure in the first build of my motor (built by someone else), Jim rebuilt my motor and worked through the issues that caused the problem. We've ran the living hell out of this car tuning it and on the dyno and it's held together. Although he never gets on here, I wanted to recognize him for his help.

It's been one helluva journey and tested my commitment like never before. I am in somewhat of a state of shock that it's actually "finished"...if there is such a thing with 928 projects......

IcemanG17

Abby....do you have any dyno runs before the turbo? Also did you lower the CR or is the internals stil stock? I am guessing its on street gas too

SeanR

Congrats, nice numbers.

Abby Normal

93 octane fuel and the motor has never been run without a turbo. It's built with 951 pistons, custom forged rods and stock crank with port matching on both sides of the heads. CR is 8:5:1 as boost was always the plan.

Jon B.

Maybe I'm missing something, buy didn't someone make around 500rwhp with 12ish psi on a Murf kit with an early 32v? What is the difference?

Mike Simard

That's way awesome. Congrats'!

The feeling of big power acceleration is one thing but when it's the result of sticking with a big project over time it's even more satisfying.

Iwanna928

That is awesome! Can I borrow your car!

Abby Normal

Let the games begin.

Was it the same type of dyno in 85 degree weather with 80% humidity?
And didn't said car end up having engine problems?
I would gladly (and love to) race that car.

Iwanna928

What was the tq on the SC.

Forgot to mention that one.

Dyno's are dyno's. It is a indicator. Nothing more nothing less. The proof of the pudding in how they drive.

I have beaten a lot of cars on the street w/ my lousey 223rwhp that I dyno'd on a 108 degree day. I dyno'd to show the increase in power by adding euro cams and nothing else. Picked up 20rwhp and lost no TQ.

I don't think I would want to run across this car. Well on second thought I would, because as she pulled away I would be smiling and in awe!

hacker-pschorr

Nice work Abby, all too often we see people toss in the towel who didn't hit anywhere near the obstacles you did.

Let this be a testament to "almost finished" projects everywhere, keep at it.

I hate to break it to you, these projects are never finished.
This is when the fun begins.



To simplify the discussion, assuming all other factors are equal, Abby's 8.5:1 compression versus a stock 10.1 can account for such a difference.

Abby's lower compression will allow him to push the boost further as he upgrades the ignition / fuel system.


What's the game plan from here? I'm running similar brains in my 81 now, Mike and I have it mapped out how to upgrade to LH2.2 / EZK if 3rd party isn't the path I take.

BC

The stock ignition system is and always will be a problem not only in total spark energy, but also tunability past a certain threshold. Yet another great boost story, and yet another situation where for want of more tunability, it would be a 650hp or more car with big tq numbers. Imagine that engine with as much boost as that rear huffer can make being run on a map/cop system.

Jon B.

Abby,

I'm NOT trying to take away from your accomplishment at all. I just like Erik's explanation better! I AM going to be going with some sort of Boost one way or another, and I KNOW that the Murf stuff makes X amount of power for the most part, I just wanted to see your take.

On another note, GREAT numbers my friend! I bet that thing MOVES!

Jim Nowak

Way to go Abby!!!!! Let's see that dyno chart.

AO

Great Job Abby! Are you running custom rods with those pistons? I ask, because I have a set of 951 pistons burning a hole in my pocket.

To Jon B.

As somewhat mention previously, the lower compression ratio allows for higher boost, but at moderate boost levels, the HP/psi will be lower. No problem if you can turn up the boost. At 8.5CR Abby should be able to run 20+ psi all day long.

The nice thing, is that he shouldn't have to dial back the ignition back all that much at these boost levels.

As a contrast, I made 443 RWHP on 9.5psi, but my compression ratio is 10:1 (or is it 10.5:1... I forget).

BTW, the Dyno will compensate for environmental factors or at least it should.

Abby Normal

Great post and spot on. Come to New Orleans and you can drive it.