[QUOTE=white89gt;6671317]

I'm not too sure what the hell is up with Frankie. I'm thinking there must be a vacuum leak somewhere's, or it doesn't like the MAF that I used. It's COLD blooded. Seems to run even kilter after it's warmed up though. I used a MAF for a 3.8 Thunderbird, which is a known compatible MAF for the EEC-IV's. Maybe I'll dig out my spare Ford MAF and give it a shot.

If it's a vacuum problem how would you explain that it runs fine when warm? How much fuel are you getting during the cold start strategy?

 

Pretty much my thoughts also when I read the thread. It's a fine example of more money than sense. Apparently he was thinking a 255 Walpro and 42 lb. injectors is all that's needed for jumping to a 17\1 compression ratio from 9\1.

I really like the, "I'm waiting on my tune," but he's too impatient to wait on his tune. Mail order tunes? That's funny.

 

Mail order tunes can be "OK" if you have specifically-known components, and a tuner has worked with exactly that combination, but I wouldn't trust them except to get me to the dyno.

Where's "17/1 compression ratio" coming from, BTW?

 

He said he's running an 8 psi pully on the SC. Stock compression ratio for a 97 SOHC 4.6 is 9\1. I agree it's not an artful way of stating what's going on by volume but it's what\how I learned to state what's going on in a quick way without explaining with the math. It's just adding boost psi to the non-boosted compression ratio since the compression ratio is seldom given in PSI which is actually much higher, 125 psi?? Actual CR with 8 psi should be a ratio somewhere between 14 to 15. The intercooler has a lot to do with what it turns out to actually be.

EDIT: Should have said, and "then adding an intercooler." I've also gone with the OP, Samuel, not saying anything about reducing the CR. He has since stated that he has built the engine to spec from top to bottom. What ever that means? Original specs or some specs for the supercharger? This has nothing to do with your question but it is interesting along with being ambivalent. Anyway, it just so happens that the addition of boost psi to original CR turns out to an obtainable CR or close to it.

""Answer:
Although some manufacturers claim a specific horsepower increase, superchargers actually add horsepower as a percentage gain (percentage of an atmosphere). Assuming an engine with a compression ratio of around 9:1 running pump gas,if a supercharger gives your engine 14.7 psi of boost (another atmosphere) that will essentially double the output of your engine, everything else being equal. After adjusting for thermal and mechanical energy transfer, if an efficient centrifugal supercharger is generating 7.5 psi (approx. 1/2 an atmosphere), you will see around a 35-40% gain in horsepower and torque at your non-supercharged maximum horsepower rpm. If detonation forces you to use an ignition/timing retard system, you will of course see less of a gain because backing off several degrees of timing will greatly reduce an engine's power output. At higher boost levels, the heat generated by compressing air will produce diminishing returns as the boost is increased, although the use of intercooling or racing fuel can avoid this scenario of diminishing returns. Assuming the use of intercooling to run higher boost levels while maintaining reliability, a 100% increase can generally be achieved at around 17 psi on an engine with 9:1 compression running pump gas. The gains in horsepower and torque delivered by each ProCharger system can be found on the price list as well as on the "ProCharger Systems" page within this site""

EDIT: I agree a mail order tune is better than impatience and nothing.

 

I've always thought of mail order tunes as "a start". Luckily I've got a place in SLC that's very reputable so I can take the 89 there after the 351 swap.

I actually bought an SCT chip for it already.

 

You know who we haven't heard from in a while... like since we asked for videos.... is 3V in a Gen 10 with 2V electronics guy. Hmmmmm.....

 

I have no doubts about you using a chip if I created that impression. The thing about mail order tunes is understanding their limitations. I've seen a lot of guys, mostly younger, install and accept the result as gospel. That's a questionable practice and something Samuel suggested he was doing until someone challenged him about it. It's not as though he installed a kit with a prepackaged tune. In fact he stated he rebuilt the PC before the install so I assume he went to ball bearings and whatever upgrades are available.

 

A 255 feeding 42's w/a PCM write for 19's..... Ieyieyiieeee! You can bump the injectors some, -24"s for instance, but no more than that without a tune.

Mail order way: - Starter tune, - data logging, - custom tune.

Speedshop/Dyno is easier.

 

Easier and probably less expensive in the end.

 

Holey crap River, you Fed the Troll again.