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Thread: N need of tbi chip

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  1. #1
    Fuel Injected!
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    Ive had the ostrich hooked up and truck running (engine n it is basically stock) but am still learning and cant afford to b without truck for a day

  2. #2
    Fuel Injected! S.O.B.B.'s Avatar
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    If u can't afford to be with the truck a spare stock computer is a great help.if u run into an issue simply plug the stock unit back in so it can be driven.scrap yard ecm are usually cheap.same with ebay.that way u can mod the one u plan to use with out the risk of having no ride.Dave w is a great help and helps all us newbs get things rolling along with all the other members this site will make it easy to get tuning.it's a lot of reading and rereading to get an idea of what to do.it gets easier as u learn the programs and different terminology used to describe things. Hth
    Jeeper
    87 sjimmy powered by a 92 cadillac 4.9L pfi on 7427pcm /700r4/ 8.8 3.55 rear/disc brakes.

  3. #3
    Fuel Injected!
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    I know Ill always have the stock memcal and chip to fall back on (got it saved), but with the current mods and no egr will the stock tune even run worth a crap or not? My round trip 5 days a week is 80 miles a day mostly highway. This is y im wanting to buy an upgraded bin so I don't have to worry bout it and can start tuning it from there as I add more upgrades. So does anyone do this?

  4. #4
    Super Moderator dave w's Avatar
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    Set the EGR "ON" minimum temperature to MAX (151c) to disable the EGR. Turn off error code 32 to prevent the Service Engine Soon from coming on for an EGR error. Sometimes a beginning chip programmer thinks turning off error code 32 only is the only programming needed disable the EGR. Some experienced chip programmers will use a "Belt & Suspenders" method to disable the EGR and also set the minimum speed to enable EGR to MAX (255 mph).

    If the engine was rebuilt stock and the only engine modification was removing the EGR, the stock chip programmed with the EGR disabled will work.

    If there are other engine modifications, please list them in this tread. Modifications like Injector Upgrades, Exhaust Upgrades, and Performance Camshaft.

    dave w

  5. #5
    Fuel Injected!
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    Block bored .30 over , valve lift int .420 exh .443, cam lift int .280 exh .295, duration int 204 exh 214, center line int 107 exh 117 LSA112 based on 1.5 RR, ill b using 1.6 RR, headers no cat , bbk underdrive pulleys, summit stage 1 sqare bore with adapter, ultimate TBI mods

  6. #6
    Fuel Injected!
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    Quote Originally Posted by gttagO View Post
    Block bored .30 over , valve lift int .420 exh .443, cam lift int .280 exh .295, duration int 204 exh 214, center line int 107 exh 117 LSA112 based on 1.5 RR, ill b using 1.6 RR, headers no cat , bbk underdrive pulleys, summit stage 1 sqare bore with adapter, ultimate TBI mods
    I drove a TBI G20 van for nearly 6 months with a stock chip despite having a Mellings MTC1 cam, 14022601 53cc chamber 305 heads, and an Edelbrock performer RPM intake on it. I also had long tubes and full exhaust. I had the fuel pressure bumped to 14 psi and set the timing to about 8° BTDC. Ran and drove just fine on the stock chip after knocking out the minimum air rate screw cover on the throttle body and adjusting the idle to 650 rpm with the IAC forced closed and disconnected (Jumper A to B in the ALDL like you are checking codes, leave the key on for 30 seconds, and with the key on disconnect the IAC connector). I then reconnected the IAC and the ECM was never able to let the idle go under 600 rpm in drive. Ended up later tuning that setup as well as swapping in a F-car LT1 cam and ported 193s.
    Last edited by Fast355; 12-10-2018 at 03:50 AM.

  7. #7
    Fuel Injected!
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    Quote Originally Posted by Fast355 View Post
    I drove a TBI G20 van for nearly 6 months with a stock chip despite having a Mellings MTC1 cam, 14022601 53cc chamber 305 heads, and an Edelbrock performer RPM intake on it. I also had long tubes and full exhaust. I had the fuel pressure bumped to 14 psi and set the timing to about 8° BTDC. Ran and drove just fine on the stock chip after knocking out the minimum air rate screw cover on the throttle body and adjusting the idle to 650 rpm with the IAC forced closed and disconnected (Jumper A to B in the ALDL like you are checking codes, leave the key on for 30 seconds, and with the key on disconnect the IAC connector). I then reconnected the IAC and the ECM was never able to let the idle go under 600 rpm in drive. Ended up later tuning that setup as well as swapping in a F-car LT1 cam and ported 193s.
    So after doing this will I have to reverse the process to tune? How will it affect log data? I understand what you've done and it sounds like that should work to start along with dave w info on EGR disable. I should have the engine in within next 2 days and don't have much choice but to try, is their a specific place I should begin with tuning it. What scarlars flags tables should I be looking at (which are the most important?) Tryin to figure it out, sure Ill have lots more questions. Thanks for all the help

  8. #8
    Super Moderator dave w's Avatar
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    Quote Originally Posted by gttagO View Post
    Block bored .30 over , valve lift int .420 exh .443, cam lift int .280 exh .295, duration int 204 exh 214, center line int 107 exh 117 LSA112 based on 1.5 RR, ill b using 1.6 RR, headers no cat , bbk underdrive pulleys, summit stage 1 sqare bore with adapter, ultimate TBI mods
    The stock chip will be OK (with the camshaft specs posted) for daily driving, as long as the EGR deleted.

    Tuning (correcting fuel and spark tables) with data logs will Optimize the performance and fuel economy.

    dave w

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