Recipe for 350HP
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
While the article does a great job of showing the MAX potential for most of the intakes (especially the smaller ones), it misleads as to how they'd all rank on a stock or stockish engine as replacement/upgrades. We know that on a stock/mild 350, the Mini Ram wouldn't be the best performer at all. IOW, you can't simply translate the "Ranking" of the the intakes in this test onto a milder engine and expect the same (but lesser/lower) results. The results would be a lot different.
Since most "builders" are shooting for 400fwhp or more, I give more "credence" to intake comparsions made on the same engine.....meaning the TxTT dynos are a much better comparison. In short, that comparison may be the best we got.
Le Mans Master
Joined: Aug 2017
Posts: 6,943
Likes: 1,490
From: New Jersey
And yet, most people push the MR as "the" solution. With all due respect, I find it interesting you (and others) can pick apart the "caveats" of the TxTT test yet fail understand the overt flaws of the L98vsLTx overlay posted in this thread. The converted L98vsLT1 dyno you just posted helps to show the reverse-cooled, higher compression LTx (Gen II) SBC has other advantage (because the LT still "wins". Obviously the Gen II block is better).
Since most "builders" are shooting for 400fwhp or more, I give more "credence" to intake comparsions made on the same engine.....meaning the TxTT dynos are a much better comparison. In short, that comparison may be the best we got.
Since most "builders" are shooting for 400fwhp or more, I give more "credence" to intake comparsions made on the same engine.....meaning the TxTT dynos are a much better comparison. In short, that comparison may be the best we got.
The test is valid for comparison on that combination for sure. I would however say if the same test were run on a milder 350 the results would look very different. But that wasn't the point. The point of the test was to tax them all and it works well for its intended purpose IMHO. It's all about picking what is right for you and I don't think anyone here is arguing that.
Pro
Joined: Oct 2004
Posts: 504
Likes: 82
From: Melbourne Victoria
It would be close but I think the rice would win against a stock c4.
https://www.corvsport.com/corvette-q...-times-by-year
https://www.corvsport.com/corvette-q...-times-by-year
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
And yet, most people push the MR as "the" solution. With all due respect, I find it interesting you (and others) can pick apart the "caveats" of the TxTT test yet fail understand the overt flaws of the L98vsLTx overlay posted in this thread. The converted L98vsLT1 dyno you just posted helps to show the reverse-cooled, higher compression LTx (Gen II) SBC has other advantage (because the LT still "wins". Obviously the Gen II block is better).
Since most "builders" are shooting for 400fwhp or more, I give more "credence" to intake comparsions made on the same engine.....meaning the TxTT dynos are a much better comparison. In short, that comparison may be the best we got.
Since most "builders" are shooting for 400fwhp or more, I give more "credence" to intake comparsions made on the same engine.....meaning the TxTT dynos are a much better comparison. In short, that comparison may be the best we got.
If you ARE building for and actually achieve over 400 hp, then the a short runner intake is the obvious choice, as shown by the 10x the Tork test. I'm not sure what the "debate" is here. Actually, there isn't one, that I am aware of. .
You made these claims:
1. TPI was designed for a 305.
2. TPI has only gains when cross section is increased.
I think you MAY be right....so I sought out dyno graphs showing that -from idle to peaks. No one produced one, so although I think you may be right about #2, we still don't know. IF you're right, and it could be shown, that would add cred to the "TPI for 305's" thinking. So that it is with that context in mind, (different cross section LTR intakes on a stock engine), that I was making the comments about the relevancy of the 10x/Tork test. It's not relevant.
Le Mans Master
Joined: Aug 2017
Posts: 6,943
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From: New Jersey
The test pull we did on mine was from 850-6400 rpm in 4th. I more wanted to see if it would knock since around town I'm lazy and don't down shift at low speeds. All the actual pulls were ~1400-6000 rpm. Doesn't spend enough time in that low to bother on a dyno.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Yep. That's how I try to do all mine....and I DO it that way specifically for accurate knowledge when it comes to threads like this! Every TPI owner crows about TPI's "low end TORK"...but who actually has a dyno graph of it? How much tq does an L98 make at 1000 RPM? (compared to other no-tork 350's)? What is funny about that?
Drifting
Joined: Jun 2020
Posts: 1,710
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From: Stay dangerous my friends
Yep. That's how I try to do all mine....and I DO it that way specifically for accurate knowledge when it comes to threads like this! Every TPI owner crows about TPI's "low end TORK"...but who actually has a dyno graph of it? How much tq does an L98 make at 1000 RPM? (compared to other no-tork 350's)? What is funny about that?
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Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
I don't agree. I mean, to each their own what they personally care about, but engine's don't have "likes" and "don't likes". Engines are quite capable of going WOT throttle at idle -regardless of what device opens the throttle plate. GM's own power graphs illustrate that even GM does pulls, starting at below 1000 RPM....which is nice because it shows us all, w/out doubt or debate, what each engine is capable of doing from the bottom, all the way up to it's top and beyond. There is most definitely validity in comparing performance between intakes, cams...whatever, from idle....ESPECIALLY, when the conversation IS about.....comparing the low end tork of intakes, cams and whatever! 
Who cares? Everyone on these and other forums, who posts about "TPI low end TORK monsters".
.
Who cares? Everyone on these and other forums, who posts about "TPI low end TORK monsters".
.
Last edited by Tom400CFI; Feb 24, 2022 at 10:11 AM.
Pro
Joined: Mar 2005
Posts: 721
Likes: 70
From: Fla
fyi... i have the following.... 396 stroker 4 bolt main, afr 195 ported, tpis mini-ram ported, billet cam with 575-595 lift, 36 pound injectors..all forged components.... on tpis dyho 540 horse at 6300 rpm. idles down like a ***** cat with a noticeable loopy idle... power everywhere... a 175 horse nitrous setup in the rear.. all very professionally... 450 rwhp....plus 175 shot...625 rear wheel horsepower with a zf 6 speed replacing the automatic for road racing and highway drivability. I bought this car on this site. It was MSEVENS car. I get feelings of selling it but when I see it and drive it, I forget all those thoughts. I have 2 corvettes and will downgrade to one by next year.
Instructor
Joined: Sep 2020
Posts: 121
Likes: 47
From: Sullivan, MO
Best
https://www.corvetteforum.com/forums...om-an-l98.html
I think this is likely the best bang for the buck for 350 HP.
I think this is likely the best bang for the buck for 350 HP.
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
fyi... i have the following.... 396 stroker 4 bolt main, afr 195 ported, tpis mini-ram ported, billet cam with 575-595 lift, 36 pound injectors..all forged components.... on tpis dyho 540 horse at 6300 rpm. idles down like a ***** cat with a noticeable loopy idle... power everywhere... a 175 horse nitrous setup in the rear.. all very professionally... 450 rwhp....plus 175 shot...625 rear wheel horsepower with a zf 6 speed replacing the automatic for road racing and highway drivability. I bought this car on this site. It was MSEVENS car. I get feelings of selling it but when I see it and drive it, I forget all those thoughts. I have 2 corvettes and will downgrade to one by next year.
Pro
Joined: Mar 2006
Posts: 521
Likes: 143
From: Caribbean/Florida
With a FIRST and moderate cam I agree the 195 eliminator heads are overkill
They sell a Chinese copy of the Dart head with the lightweight valvetrain for about a grand. Hit up tpi421vette for a good price
Think they are around 240-250cfm which is enough. Im not a fan of imported heads but you wont be able to realize the potential of the 195s. AFR 180 is a nice head got the TPI
There are a bunch of aftermarket Cast Iron heads that dont cost much and can make plenty of power.
They sell a Chinese copy of the Dart head with the lightweight valvetrain for about a grand. Hit up tpi421vette for a good price
Think they are around 240-250cfm which is enough. Im not a fan of imported heads but you wont be able to realize the potential of the 195s. AFR 180 is a nice head got the TPI
There are a bunch of aftermarket Cast Iron heads that dont cost much and can make plenty of power.
Any contact or information on how to get a hold of tpi421vette?, thanks.
Safety Car
Joined: Apr 2016
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From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified