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  1. Replies
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    Your van seemed low on power, but it is what it...

    Your van seemed low on power, but it is what it is and you had manifolds on it not tri-y headers. I tend to believe what the dyno read with the 357 rwhp TBI because I did end up running a 13.9 @ 101...
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    I love that engine. Have one in my 99 Tahoe with...

    I love that engine. Have one in my 99 Tahoe with the 425hp Marine cam and headers. With a 4L80E and 3.42 geared 9.5 behind it. Tahoe is on 32" tall P305/50R20s and it loves to cruise. 70 mph is...
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    No suprise on that cam working well. It did ok...

    No suprise on that cam working well. It did ok for me as well in the low-midrange. Its a marine cam designed to make as much torque as possible from off-idle through 4,800 rpm.

    Glad someone can...
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    Honestly I would go an 8.1. I have one in my 99...

    Honestly I would go an 8.1. I have one in my 99 Tahoe and one in my 83 G20. Both are from Express/Savanna vans.
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    My Express van is actually under the knife this...

    My Express van is actually under the knife this summer so to speak. I hurt the L31s short block. Its getting something ALOT more powerful, lol. Going to have to really get it dialed in well...
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    IIRC those never vans only had one shroud part...

    IIRC those never vans only had one shroud part number for both the 18" and 19.5" HD cooling fans. Even if you have the 18" fan you can measure the shroud and its likely a 21" opening. Would give...
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    The white wire off your coil connector that is...

    The white wire off your coil connector that is not connected to anything is a standard 8 cylinder tach output.....Just pointing it out.
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    I would honestly try a Vortec GMT400 11 blade...

    I would honestly try a Vortec GMT400 11 blade composite tow package fan blade before upgrading the clutch. Those came on like a 98 Tahoe. Those 5 blade steel jobs do not pull nearly as much air even...
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    Mine progressively lost power as it heat soaked....

    Mine progressively lost power as it heat soaked. First pull was 204 and the 3rd pull 198.

    The Express van took a huge hit after the first pull. 2nd pull was aborted because of an accidental...
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    Good to see you are starting to get somewhere. ...

    Good to see you are starting to get somewhere. Torque is finally starting to reach where I feel it should be.

    My guess is the stock manifolds just have a strangle hold on your engine. As I said...
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    Where you in 2nd gear when this was happening? ...

    Where you in 2nd gear when this was happening? Just want to point out you can make the 4L60E lock the converter in 2nd gear like the older 700r4s through the programming.
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    I wish I had screenshots of the fuel trim maps on...

    I wish I had screenshots of the fuel trim maps on my L31 running E10 back in the day before it was ever tuned. The fuel trims were all +8 to +11%. Changed stoich from 14.73 to 14.12 and the fuel...
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    Post #7 in this thread....

    Post #7 in this thread.
    https://www.thirdgen.org/forums/tbi/391406-budget-tbi-buildup.html
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    ^^^ I was onto that bias table still having a...

    ^^^ I was onto that bias table still having a value other than zero and zeroing the table bias as causing an issue.

    You can easily edit the ADX to include the initial timing value in the...
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    Anything over 1/4 warm and running is giving away...

    Anything over 1/4 warm and running is giving away torque as well as RPM. Any non running adjustment is also not accurate.

    FWIW, this time around my L31 is getting Comp reduced travel roller...
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    With a hot engine I would not go more than 1/4...

    With a hot engine I would not go more than 1/4 turn preload.
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    One other thing I forgot to mention. I would...

    One other thing I forgot to mention. I would try your timing increments in 2° increments.
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    I am also only comparing to your comparitive...

    I am also only comparing to your comparitive numbers in your table form.

    The TBI head and cam engine with rockers and headers made over 200 rwhp from 3,600-4,600 rpm. Kitch also saw very similar...
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    I know there is a difference. I ran my Titan on...

    I know there is a difference. I ran my Titan on a Mustang dyno. It put down 296 rwhp and 388 rwtq. I put it on the same Dynojet and saw 330 rwhp and 396 rwtq. The 1.1 conversion is probably...
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    I would definately try a 1/4 turn running since...

    I would definately try a 1/4 turn running since it would not take long to do. It would be interesting to see if there is a difference and how much of a difference there might be. I had a blueprinted...
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    Also a further discrepency I see is the fact the...

    Also a further discrepency I see is the fact the 300 HP marine TBI Vortec engines used the same cam and a GMPP Vortec TBI like manifold except without EGR provisions with 2" TB openings and 454 TBI...
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    You are correct on the timing. You are able to...

    You are correct on the timing. You are able to quickly offset the whole curve by altering the initial value in the chip.

    I think the biggest shock to me is the stock swirl port head, stock TBI...
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    duplicate...

    duplicate...
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    The choker ring of death as I call it. I used a...

    The choker ring of death as I call it. I used a hypertech powerbowl back in the day but I think they have been discontinued. Could make something equal out of a HVAC part or a stainless mixing...
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    Not sure I am following what you did with the...

    Not sure I am following what you did with the timing. Did you alter the initial advance at the distributor or in the PCM? If you have the distributer at 10° and the Initial in PCM at 10° there is a...
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