It would be very interesting to see what a DFI system would do on your car. Given you have all the goodies such as them high zoot Brodix heads. Our stock eliminator cars are full weight cars running STOCK unported heads (well unported appearing) neverless they DON'T have the extensive porting and overall port cross sectional area as an aftermarket 227cc Brodix does nor do we have the displacement as your engines do. Yet we run as fast as you do with a much smaller displacement and in a full weight, full interior car. We also don't run any kind of ducting in fact we don't even run a air filter on the end of the TB at all. We have to run the opti spark but it acts only as a distributor. The optical sensors are gutted and we run a crank trigger ignition thru a MSD 7 box. Other than that its an old DFI G6 ECU and get this 19lb injectors at 50 to 56 PSI

 

Are you going to try a 870 ? would that be to costly to do having use that burn off module that the 870 uses. I would like to see the outcome of that test.

 

Not sure what to say. But I can assure you there is more to your "stock eliminator" cars than your letting out. Otherwise, if all that was needed on a "stock" 350 was a DFI system there would be MANY more 10sec cars than there are.

I can assure you that your probably running cams that have one intended purpose and that is all out performance in a single application (racing) and other components specifically designed for the intent. And I bet there's some SERIOUS jingle invested in the cars also. Not to mention a godzillion RPMs needed to make the power. With serious maintenance after each run

I have seen these "stocker" at national events. Even the guys working on them laugh when you mention "stock" form. Like cam profiles that actually send the lifters sailing off the top of the cam to achieve higher lifts than are allowed by "cam spec" rules.

I am on other boards, primarily HEAVY hardcore bracket racers forums, most of which run in the 8s and 7s in dragsters. Right now they are calling me a liar for posting these ETs and MPHs, in a full weight car with the heads and cam I am running. They are saying NO WAY is it possible to run those sorta times without juice or other adders. Well you and I both know I am not one to lie about my setups, they are what they are and many people have seen them in person perform as they do.

So I have to say that I think the cars are doing very well for what they are, and I can't see a DFI system making any dramatic improvement to the performance. When you get right down to it, as I have always stated, you need Spark, Air and Fuel. If everything is working as should be in the stock setups, you can't get it much better. I will say with the cams and what-not your probably running in the "stocker" cars, they might need that DFI to handle the radical cam profiles etc that it takes to make them run as they do. But we are comparing apples to oranges here. Nobody if buying for a second that you simply put a DFI on a stock 300 and some CI motor, its going to run 10.6s. If that were true then its imaginable with my CI motor, that if I went to DFI, the car would hit 8s with the same components

 

i think most people dont appreciate how strong stock elim cars run with all the restrictions they have. Of course there's a lot more trickery in those engines than meets the eye, but unbelievably strong nonetheless. Of course the stock elim cars are also optimized for the track with no consideration for driving on the street, high rpm cams with tranny and gears to keep the car in the power band.

 

Ski, you are absolutely correct. The cams we run are all out drag racing cams and NOT streetable at all. We run Bullet cams with numbers in the 260+ regions on a 108 or 106 LSA, needless to say theres a considerable amount of overlap there The lobe resembleb blocks with the edges rounded off because we can't have more lift than stock. We carry complete sets of rocker arms with us at every event. We constantly punch pushrods through them because we are not allowed to use anything by the stamped steel rocker arms, unless they came with roller rockers.And yes we spin the motors to the moon, at going thru the traps at 8000+

And yes, we have a lot invested in chassis tuning as well, that is afterall a key element in both handling and efficiency of the car. We have about $135k in the 95 firebird. And that doesn't include a spare motor. We do have to live within the class rules, while the rule book says "Stock Appearing" ports we bend the rules as much as we can. However we can't change compression ratios, we can only mill the block to X amount and we can't change the chamber designs. There is only so much we can do to the porting with acid to gain bigger flow numbers before they become obviously larger than stock.

But I still maintain that these heads flow no where near what a aftermarket Brodix 227 that is fully CNC ported can do, not to mention the displacement differences. Plus we have to run the STOCK 48mm throttle body, there are no sneaking in a different size there because the tech boys have a go/no go gauge they stuff into the bores to check us.

I don't tune for part throttle at all and we tune only with alpha N mode which is TPS vs RPM instead of RPM vs MAP. Our injectors are static at WOT and we use EGT monitoring to tweak the fuel pressure after a run. So yes it is single purpose only, to go fast down the track.

What do you think your car would do if it was configured in the same manner? Single purpose only I mean?

 

Tj.

There is no doubt is I negated the purpose of having a street car/strip car I could easily get the car to run 9s or even 8s maybe with enough money/time added.

Its tough to get enough track time to fine tune each component to perfection as they setups you describe have done to them.

As you can see each time we head out to the track the times get better and the MPH increases. Where it will top out at, I am not real sure. So there is certainly more to come. To the extent of the cars you describe above, I doubt very much due to limited track time available, Money and moreover free time. Its a hobby for me, not a business.