I was not sure if you saw this post at the end of my last thread, so I am posting it in a new one. I am not trying to be redundant, or a pest, just wanted to make sure you saw it.

OK, here are some specific questions. I used the search function and learned a great deal, but these are a few things I still need cleared up. I will give you my exact stats first:

-1996 Ford Bronco 5.0L (302)
-JBA Short Tube Headers (p/n 1667) w/ Custom exhaust (cats & sensors intact)
-MSD 6A Ignition w/Taylor Wires
-MSD Cap and Rotor
-Crane Fireball PS-91 Coil
-BBK Twin 56MM Throttle Body
-PRO-M 70MM Mass Air Meter (Factory, modified bridge, tuned for stock injectors)
-K&N Aircharger (p/n 63-1066)
-JET Ford Performance Module (p/n 89605)
-JET Low Temp Thermostat (p/n 10170)
-B&M Shift Improver
-All factory emission equipment (functional)
-EGR, PCV, TPS, Fuel Filter all brand new
-No computer codes set
-Fuel pressure at rail dead on with factory specifications
-New TPS checked through range from throttle shut to WOT with voltmeter. Smooth transitions with no problems indicated.
-No vacuum leaks or exhaust leaks
-Ignition system is tight. No signs of arcing or sparking, no carbon tracks inside the cap. No sparks visible underhood in the dark.

1. I have been told that the JET module I currently have installed only affects performance at WOT. My e-mails to JET have gone unanswered. Is this information correct?

2. One of the posts I read concerned aftermarket MAF requiring custom chip. My PRO-M MAF is 70MM (Ford factory MAF) that has been modified by machining out the bridge post, and is tuned for factory injectors and cold air induction. Will the Superchips tuner work for me or is a custom chip required?

3. If a custom chip is required, recommendations?

4. As for the flat spot in my acceleration curve, this occurs at 50-70% throttle vs WOT. If the JET only functions at WOT, my thoughts were that the problem revolves around insufficient timing advance. With the exception of that momentary glitch, the truck runs like a bat out of hell with no other driveability concerns. Your opinion?

5. As the Superchips tuner and the Diablo chips improve shift firmness and modify transmission control, I am assuming they would be incompatible with my B&M Shift Improver and that it would have to be removed. Is this correct?

I thank you for taking the time to read all this stuff. Please understand that I just want to ensure I am headed down the right path before I kick in another $300 or so. If I am going to eat the JET module because I did insufficient research, just want to make sure I get it right this time.

Thanks

Tom H.
http://www.clubfte.com/users/bigred...sBigBronco.html

 

I see all the posts in this section (I get notified by email of every time there is a new post). I check them about every 2 days now and don't answer the one's that require a long response on the weekend. Those wait until Monday so I can spend some time with the family.

I can tell you this much right now without going into details until Monday.... I wouldn't program for your modifications until you have a dyno pull that includes an air/fuel ratio graph. You're looking at a dyno pull, a chip, custom fees and final dyno pull. Because of dyno time, its going to cost well over $300.

 

OK Ken. I'll look forward to your reply during the week.
Family comes first. Have a good weekend.

Tom H.

 

Ken,
Just a follow up item for when you get to this one during the week.

I went out and did a WOT run. Don't like to do that from a stop too often...I like my driveshaft in its current condition. As far as the flat spot in my acceleration curve...uummmm...there isn't one at WOT.

This is the first time I have done it since I installed the BBK Throttle Body, K&N Aircharger, and Crane PS-91 Coil. All I can say about the run is HOLY S&*%!

Ran it up to about 90 or so, then backed off. No flat spot at all with WOT, just gettup and go. That leaves me with a small dip in my acceleration curve with 50-70% throttle. If the JET chip only works at WOT, then the problem may be insufficient timing advance at partial throttle.

Your Thoughts..

 

i saw dynos of a ram with jetchip- under wot- it was less than stock pcm
under part throttle- it had a little bit more hp and torque- hope this helps-phil

 

Ken,
Just another follow-up note. JET finally responded to my e-mail. Their response was very brief. My e-mail outlined my questions with their product and specifically addressed the question about the JET chip only providing performance mods to the stock ECM program at WOT.
Their reply

"Not true. Being emissions legal, we cannot modify below 2000 rpm, so it would be more noticable mid range and top end."

That was it, no point of contact or any real information.
Regarding your response to my original post, I would be willing to dyno my truck in order for you to assess the chip possibilities. Not sure why this would be necessary with the mods I have done, but I trust your judgement based on your reputation.
I have the spec sheet that PRO-M sent with my 70MM Mass Air Sensor if that would be of help. I thought about my B&M Shift Improver question, and based on the shifting characteristic mods your products offer, I am guessing the best answer would be for me to disconnect the B&M electronic unit, and base everything on my stock transmission programming.

Still looking forward to your assesment of the possibilities.

Tom H.

 

Superchips has a CARB number and is 50 state emissions legal, and they tune at all throttle positions.

The dyno pull isn't 100% required. However, with an aftermarket maf I can't guarantee a perfect a/f ratio unless I know what the a/f ratio is before the chip. The Pro-M spec sheet will help quite a bit.

 

Ken, thanks for taking the time to reply...I know you are very busy these days.

I am guessing based on your response that the answer to my original question is that the custom chip is a better choice for me than the Superchips Microtuner. True?

Do you agree that with either the Superchips or the Diablo custom, the B&M Electronic shift improver needs to go?

Finally, the Pro-M MAF is the stock diameter with the classic Ford "bridge" machined out and a custom module tuned for stock injectors and cold air intake. Would you want me to attach the Pro-M spec sheet to my chip order form?
(I am not so concerned with the cost of the dyno, it is just that the nearest facility I can find is 150 miles away)

Thanks again,
Tom

 

A chip would be a good bet, especially since many of the features that makes Microtuner desirable (tire and gear changes) aren't supported for your year vehicle).

 

If I get a programer will I beable to adjust my shift point and slip also or will I need to get a trans programer also?

 

Yes, you'll be able to adjust shift points and shift firmness.