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Topic: To TBI/MPI owners---- gauging chipped computers  (Read 234 times)
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« on: March 10, 2010, 06:50:06 AM »

There is a guy on the other forums im on that does turbo-mopar computers and does the shelby dakota computers thats great.He takes the computers and then chips them and has the maps to them and  changes them around. 

He has done wonders with the  turbo computer for the club and also the dakotas. I got into talking to him about a computer for my ramcharger since i want to add a mild cam but keep the tbisetup and he said its something he can do (hasent yet on our type computer) but want to see if there is ANY real intrest from other members to do this or if this is going  to me a one customer project and if so  might be a lot of work to  get the maps and all for one person.   

I thought this might be a great alt to a mega system


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 90 dodge daytona shelby vnt Turbo Intercooled 13.49 1/4
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« Reply #1 on: March 10, 2010, 09:36:20 AM »

i could be intrested. i want to run the mpi on my new magnum. it has a new cam and would like to run a better t-body/manifold from http://www.hughesengines.com. i just haven't decided on OBD1, 2 or going aftermarket. would be nice to have another option on stock computers. any idea yet what he charges?
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« Reply #2 on: March 10, 2010, 10:03:01 PM »

I read about and mentioned a few of these guys "socketing" the old black boxes of death, but usually blow it off since no one has taken the time to decompile the TBI logic. Now that he is offering to step up, that is no longer a concern.

I am personally not interested, since I understand the costs and time involved, but I do believe a few have been looking for this.

The mpfi obd1 crowd may also take a slight interest in this, but maybe not since mopar atleast offers them a hotter box off the shelf.

Does he have a ramcharger or heavy truck to test on? Timing curve is a key factor here, and my main complaint against howell/afi/stock that involve "chips". I don't want to have to keep removing chips and having them sent off until the process gets right (or end up with a generic tune that is safe for all, optimal for none). With cars it is pretty simple since weight/tire size/gear ratio is more consistent.
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« Reply #3 on: March 10, 2010, 10:31:43 PM »

the problem with  mopar's 1st gen "hot" pcm is the requirement for premium fuel. which is why i may go aftermarket or OBD2 so i can maximize an 87oct tune. hyper tech and superchips advertise an 87 tune in their programmers. i need to get more serious in my research.
I read about and mentioned a few of these guys "socketing" the old black boxes of death, but usually blow it off since no one has taken the time to decompile the TBI logic. Now that he is offering to step up, that is no longer a concern.

I am personally not interested, since I understand the costs and time involved, but I do believe a few have been looking for this.

The mpfi obd1 crowd may also take a slight interest in this, but maybe not since mopar atleast offers them a hotter box off the shelf.

Does he have a ramcharger or heavy truck to test on? Timing curve is a key factor here, and my main complaint against howell/afi/stock that involve "chips". I don't want to have to keep removing chips and having them sent off until the process gets right (or end up with a generic tune that is safe for all, optimal for none). With cars it is pretty simple since weight/tire size/gear ratio is more consistent.
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« Reply #4 on: March 10, 2010, 10:46:54 PM »

the problem with  mopar's 1st gen "hot" pcm is the requirement for premium fuel. which is why i may go aftermarket or OBD2 so i can maximize an 87oct tune. hyper tech and superchips advertise an 87 tune in their programmers. i need to get more serious in my research.

That is definitely true, and practically a requirement for noticing performance gains. Why?
We have heavy trucks. Heavier the vehicle, the more ping-prone.
We are under geared. Taller the gear, more ping prone.
We have taller tires. Taller the tire, the more ping prone.
We some times tow, increasing weight even more.

Where does power/mpg/driveability come from? Mostly timing. Timing can have an amazing effect on all of the above, but of course is more ping prone. The MP box has increased timing, and requires premium/no towing for this reason. Dodge's [stock] strategy usually involves richer mixtures, so fuel itself is not usually of prime concern, not to mention precise fuel control usually offers minimal gains in my own dyno experience. There was a rather large window in AFR to play around in w/o much gain or loss in power. Of course, there is mention of ping again, as the mixture starts getting in the leaner side of safe.

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« Reply #5 on: March 11, 2010, 06:42:15 AM »

he has done 2 computers for me (my cars) and 2 for my customers.  He sends you a full "spec" sheet for you to fill out and then "adjusts" the stuff from there.   my daytona usedx to run VERY rich under boost (over 15psi ) because someone else was using the safe method now with his im at 11.9-12.0 under 20ish psi of boost plus   i have a 2 step and  knock dect so so far its been good and  once he had to do some "adjustments" because i run  meth  injection so the fuel was off when i was running  the progressive meth told him when it was running rich and he sent me out another computer swapped it out and sent the other one back.   for the fwd chryslers(turbos) he is charging about 250.00 with socking and some options.  Like i said its something me and him are talking about for when i start my motor build.
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 90 dodge daytona shelby vnt Turbo Intercooled 13.49 1/4
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« Reply #6 on: March 11, 2010, 07:01:41 AM »

Cool! Ya you too have noticed dodges run a wee bit rich.

That is a pretty fair price. I had only assumed the labor to explore uncharted territory (tbi blackbox) would be tremendous.

That is very cool that he has a loaner pcm to prevent down time. Most of the chip burners just expect you to put your rig in the stable until they get around to finally burning a new tune. I suppose you could have a spare pcm to send off to them, never thought of that, but seems unneeded for this guy.

Will you be using a AFR gauge in this truck during initial process? Dyno time?

While we are at this, you do realize you can run bigger cam w/o trouble? The important thing when you order is to go wider on the LSA, maybe even 114 or even 116º, which provides less overlap, which means less MAP fluctuations at idle, which means cleaner signal and smoother idle. That customization can cost between $10-$30 additional over the off the shelf base version.

The smoother idle actually can rob a little low end power but the trade off is worth it.
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« Reply #7 on: March 11, 2010, 07:48:22 AM »

well joe thats the thing i dont know how"big of a cam i can go before the computer becomes a issue

im "building up" my 360 tbi   bottom end isnt getting anything special expect maybe hyper pistons other then that a clean bottom end build the heads will get rebuilt with a clean up porting and gasket matching.   I was told the 360 tbi injectors will flow enough without issue. Im not trying to build a crazy motor just want to go up a few steps on the cam to bring up low/mid torque and all

i think it was  comp cams has a good cam for our computer controlled 360's right Huh gonna call them this week
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 90 dodge daytona shelby vnt Turbo Intercooled 13.49 1/4
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« Reply #8 on: March 11, 2010, 08:16:18 AM »

i think it was  comp cams has a good cam for our computer controlled 360's right Huh gonna call them this week


They sell cams specifically for the TBI motors, and are one of the companies I had called and found out about low price "custom grinds". I believe their price was $10 extra for custom grind, but I could have been wrong, it's been quite some time since I have called.

86-92 PreMag

I am well aware it says require computer modifications. I was not offering the info as an alternative to a computer tune, only mentioning that these are labeled for use with computer controlled and should be relatively trouble free with the tune unlike some more radical variants. Someone listed a site with stock specs, which if I remember correctly were ~240 advertised and ~190@.050
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« Reply #9 on: March 11, 2010, 08:56:58 AM »

i know you were not    i am still looking for a cam  but also looking at plan b if the cam idea wont work.
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 90 dodge daytona shelby vnt Turbo Intercooled 13.49 1/4
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« Reply #10 on: March 12, 2010, 09:51:26 PM »

When I was going to build a 90 tbi for my baby I was going to go with a better than towing cam for a 94 ram I think comp cams was the maker. With no computer mods needed. You can also reset the timming curve with the right scan tool. I have a DRB 2 for my fleet. I was able to tweek the timming to gain some power also a black box in line to the ECM input witch will change the temp the air temp sensor sends to the ECM. It will also help with running better. I am going to up grade all my FI trucks to a OBD 1 magnum engine and wiring. A stock TBI 360 only has 165 to 185 HP where a magnum 318 is at least 220 HP. But the magnum is a less reliable engine. prone to many problems but with the right parts can be really good. I kinda lost my point but all well. Good looking out for finding a guy to retune a TBI ECM. Could of used that 6 years ago.
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« Reply #11 on: March 13, 2010, 04:44:09 AM »

When I was going to build a 90 tbi for my baby I was going to go with a better than towing cam for a 94 ram I think comp cams was the maker. With no computer mods needed. You can also reset the timming curve with the right scan tool. I have a DRB 2 for my fleet. I was able to tweek the timming to gain some power also a black box in line to the ECM input witch will change the temp the air temp sensor sends to the ECM. It will also help with running better. I am going to up grade all my FI trucks to a OBD 1 magnum engine and wiring. A stock TBI 360 only has 165 to 185 HP where a magnum 318 is at least 220 HP. But the magnum is a less reliable engine. prone to many problems but with the right parts can be really good. I kinda lost my point but all well. Good looking out for finding a guy to retune a TBI ECM. Could of used that 6 years ago.

The fancy scan tool required for adjusting timing on a TBI engine is called a distributor wrench. Wink

Skip those resistor boxes that alter air/coolant temp readings. These things cause problems. Especially when the air/coolant is really hot/cold and the pcm cannot recognize it. I call those things "trouble makers". Sure when your air temps are 85* and you lie and say 60*, things are great. When air is 120 and it only reads 80, things can be bad. When it is 60, and the resistor lies and says 30*, you get other problems.

Consider it the equivalent of playing with your choke.
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« Reply #12 on: March 13, 2010, 09:02:10 PM »

oh ok my buddy has one on is 05 cummings.
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« Reply #13 on: March 14, 2010, 12:26:47 AM »

cummings.

in his WHAT?
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« Reply #14 on: March 14, 2010, 12:30:11 AM »

here is an allpar page with the small block specs. about 3/4 the way down they have the cam specs.

http://www.allpar.com/mopar/318.html

just goes to show you what a better cylinder head and a little more compression will do. the magnum engines aren't on the list. they are in the .390s in lift, about 240* advertised duration. yet they make better power. way more when the barrel intake is disposed of.

knowing the facts that joe mentioned about gearing and all that, you do need to have your combo well thought out, engine and fuel management and gearing and tires. otherwise it will never live up to what you want. one of the reasons i will go with 4.56s with the new lift/tires is based on that need. i want to try to run an 87 oct tune. the cam i am using is a reground stock cam with 208/214 dur, .512/.520 lift on a 112 lsa. i think even a tbi could work with that cam but would like to go mpi.
an aftermarket intake manifold and headers are all part of making the 360 work well enough to use the conservative tune. it's all about matching componets. otherwise any computer tune will be less than what you want.
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« Reply #15 on: March 14, 2010, 12:47:19 AM »

You know? If I knew someone with a MP pcm (obd1) I would love to try it with some steep gears, I almost wonder if you could get away with some 87? Worst that could happen (I think) is you bring the old pcm with you on the road test and throw it back in if you experienced ping, or take it easy to the nearest gas station and top up with premium.  Think No clue

Of course I would have to borrow someone else's, because I wouldn't want to buy a new one and find it won't work with my (your) goals.
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« Reply #16 on: March 14, 2010, 01:13:07 AM »

one of my favorite bennys to being a parts guy is the cheaper prices. i can get a stock obd1 for $200, obd2 for less than $300. or ideally, find a working used unit to be reprogramed. problem for obd2 is you need the original vin.
You know? If I knew someone with a MP pcm (obd1) I would love to try it with some steep gears, I almost wonder if you could get away with some 87? Worst that could happen (I think) is you bring the old pcm with you on the road test and throw it back in if you experienced ping, or take it easy to the nearest gas station and top up with premium.  Think No clue

Of course I would have to borrow someone else's, because I wouldn't want to buy a new one and find it won't work with my (your) goals.
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« Reply #17 on: March 14, 2010, 01:40:20 AM »

I would be interested, too.  Looking at doing a mild upgrade on my 88 318 over the next year or so.  Upgraded cam, intake, heads, pistons, etc.  I would like a little more wiggle room on my options.


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« Reply #18 on: March 14, 2010, 05:58:54 PM »

ok
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 90 dodge daytona shelby vnt Turbo Intercooled 13.49 1/4
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