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Thread: 400FWHP TBI build attempt thread

  1. #31
    Fuel Injected!
    Join Date
    Mar 2015
    Posts
    54
    Rather old first attempt at building and smoothing a VE table, based on... gut I guess. No idea if I'm even close but this is what I started with, dreaming back in Dec. 2016. screen shots of both graphs as well. For spark tables I considered working with Vortec head stock tables as a fairly conservative ballpark, maybe even stock aluminum head LTI F body tables and dialing it back pretty broadly since classic Gen I SBC isn't reverse cooled. No chance of making 46* anywhere like an LT1, especially at 10.2:1 lol. This is where I really have no idea to build a spark table. I still think the Vortec tables are decent place to start, maybe something like an aluminum headed L98 as a base? The ProMaxx 2169 heads' flow numbers are well published, they post them on their site, Skip White measured them a year ago, I think HotRod magazine online had a budget head shootout with flow numbers when they were still Patriot heads, though I'm pretty sure that was a previous design.
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  2. #32
    Fuel Injected!
    Join Date
    Mar 2015
    Posts
    54
    Havenít touched it for 12 days until tonight, very brief time spent. Cleaned up the spider I acquired from a boneyard LT1 D body. Also soaked the new lifters in virgin mineral spirits for an hour to clean them. Blew them dry with air and put them in the oil bath until tomorrow evening.

    What I have been able to do is study the hell out of VE and spark tables from a variety of engines similar to what Iím putting together. Iím most familiar with F body LT1s. With a 218/224 - .528/.535 cam in 185cc aluminum heads Iím not too far away from an LT4ís flow characteristics. Iím a tiny bit bigger on cam, tiny bit smaller on heads (heard LT4s were 190cc heads, maybe not accurate). My goal is to put together a better 2nd attempt on the VE tables and take a stab at the spark tables in the bin and upload that in a couple of days. Scrutiny of more experienced guys would be welcomed.
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  3. #33
    Fuel Injected!
    Join Date
    Feb 2013
    Location
    Euless, TX
    Posts
    1,579
    Quote Originally Posted by Gojira94 View Post
    Havenít touched it for 12 days until tonight, very brief time spent. Cleaned up the spider I acquired from a boneyard LT1 D body. Also soaked the new lifters in virgin mineral spirits for an hour to clean them. Blew them dry with air and put them in the oil bath until tomorrow evening.

    What I have been able to do is study the hell out of VE and spark tables from a variety of engines similar to what Iím putting together. Iím most familiar with F body LT1s. With a 218/224 - .528/.535 cam in 185cc aluminum heads Iím not too far away from an LT4ís flow characteristics. Iím a tiny bit bigger on cam, tiny bit smaller on heads (heard LT4s were 190cc heads, maybe not accurate). My goal is to put together a better 2nd attempt on the VE tables and take a stab at the spark tables in the bin and upload that in a couple of days. Scrutiny of more experienced guys would be welcomed.
    LT4 heads are195cc with 2.00/1.55 valves. Their smallish chambers have them at 10.8:1 with the flat top piston. The cam is 203/210 @ .050 and they run 1.6 roller rockers from GM.

    I have 205cc copies of Dart Pro1 Platinums on the L31 in my Express van. With a 215/224 cam and 1.7 roller rockers. With the MAF disabled I had to add a good bit of VE above 2,500 rpm. With SD disabled the MAF only required slight tweaking in the lower rpm, lighter load areas to get the fueling back to optimal. Once they were both fixed it was noticeably smoother and stronger across the whole RPM range. Converter stalls 2,500 rpm and I have 4.56 gears with the 30.5" tall tires. I turn 2,600 rpm @ 70 mph in OD. With the travel trailer in tow I have found any real grade has me in 3rd @ 3,500 rpm and if the climb is long enough or steep enough I have plenty of RPM left in 2nd gear if needed as well. 2nd puts me at 5,200 rpm @ 70. My shift points in Tow/Haul let it grunt a bit though and I do not downshift to 2nd unless I am under 65 mph in Tow/Haul.

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