TPI VS TBI on a performance intake

Small Block Chevy Torque Specs - Summit Racing Equipment
https://help.summitracing.com/app/answers/detail/a_id/4925/~/small-block-chevy-torque-specs

What?? Talk to Gear Venders, they are selling $3/4K systems and not warning any one of the stock over drive failure, I would think if that was true there would have been a class action law suit years ago.

Spent a morning talking with Ken here: https://firstfuelinjection.com/ the day after I posted this here.

The man KNOWS TPI...Build TPI systems and he said a Stock system will work great on my engine up to 5000RPMs as I am NOT building a hot rod, BUT if I was he has systems that can feed a monster to over 6000 and give great torque and power.

Also the reason everyone thinks the the TPI Peeks at 2800RPMs is because that is the Torque peek of the CAMSHAFT....

So I getting down to the wire, the only remaining question is the PCM...

Rich

racprops said:

Spent a morning talking with Ken here: https://firstfuelinjection.com/ the day after I posted this here.

The man KNOWS TPI...Build TPI systems and he said a Stock system will work great on my engine up to 5000RPMs as I am NOT building a hot rod, BUT if I was he has systems that can feed a monster to over 6000 and give great torque and power.

Also the reason everyone thinks the the TPI Peeks at 2800RPMs is because that is the Torque peek of the CAMSHAFT....

So I getting down to the wire, the only remaining question is the PCM...

Rich

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No, the runner length dictates peak torque RPM. You spoke to someone who's gay for TPI and claims it has no flaws. Just like talking to a tranny builder who claims to be able to make a 700R4 survive behind a blown big block. They'll tell you exactly what you want to hear so you give them your money. TPI is all about midrange torque.

racprops said:

Small Block Chevy Torque Specs - Summit Racing Equipment

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https://help.summitracing.com/app/answers/detail/a_id/4925/~/small-block-chevy-torque-specs

• Notes. These specs are for stock-type bolts with light engine oil applied to the threads and the underside of the bolt head. Moly and other lubes offer reduced friction and increased bolt tension, which will affect the torque figure.

I found three other sites and utube that all call for oil....​

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No problem. Follow Summit's advice instead of the service manual.

I won't be around to watch you adding coolant. Your secret is safe.

Every SBC built WILL leak water unless the head bolts are sealed. Known fact. If they don't leak you are one very lucky person. GM seals the threads, you should to. The sealant will act as a lube until it sets up.

Ken

I took the easy way out when I had the heads off of my 1500 and bought new Felpro head bolts that had sealant preapplied. On the Camaro, I found ARP head bolts so I ended it chasing threads with a tap/die and buying a $30 tube of thread sealant.

Supercharged111 said:

No, the runner length dictates peak torque RPM. You spoke to someone who's gay for TPI and claims it has no flaws. Just like talking to a tranny builder who claims to be able to make a 700R4 survive behind a blown big block. They'll tell you exactly what you want to hear so you give them your money. TPI is all about midrange torque.

Click to expand...

THAT is just the thing he told me to run what I brought, to run the stock intakes I already have, so he is not making a dime. And again almost no one has tested one with a low RPM cam only stock cams that also peak at mid-range, so what is in control, the cam or the intake??

kenh said:

Every SBC built WILL leak water unless the head bolts are sealed. Known fact. If they don't leak you are one very lucky person. GM seals the threads, you should to. The sealant will act as a lube until it sets up.

Ken

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Supercharged111 said:

I took the easy way out when I had the heads off of my 1500 and bought new Felpro head bolts that had sealant preapplied. On the Camaro, I found ARP head bolts so I ended it chasing threads with a tap/die and buying a $30 tube of thread sealant.

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OK I will ask around. But why would Summit screw up like that?? After all they can then sell the sealer...

Rich

racprops said:

THAT is just the thing he told me to run what I brought, to run the stock intakes I already have, so he is not making a dime. And again almost no one has tested one with a low RPM cam only stock cams that also peak at mid-range, so what is in control, the cam or the intake??





OK I will ask around. But why would Summit screw up like that?? After all they can then sell the sealer...

Rich

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The intake has more say than the cam to an extent. I can slap a 230ish cam in my Z06 and still see torque peak right around 5200 with the stock intake.

I only see a possible issue or three. I am concerned with the 9.5:1 compression with a cam and engine that size having detonation due to very high cylinder pressure. The Rhoads lifters will increase this tendency. This combo will likely not want much ignition advance. I am also concerned that the Valvetrain noise will tickle the knock sensors. I don't know if the Fast system uses knock sensors. If you see knock at hot idle from valvetrain noise you may be able to dampen their sensitivity. The "D" dish and small chamber will mitigate that issue somewhat. I would run the FST-302000-06 computer/harness from Summit Racing. It is a self tuning (mostly) computer and you don't even need a mass air flow sensor. That computer does not understand boost just so you know. A set of Rhoads lifters shouldn't give a second torque peak. It is much more likely have a wider flatter torque peak.
I have used Rhoads lifters for over 35 years nd they work as advertised.
I also will not build an engine without Total Seal rings. In my opinion building an engine without them is a waste of time and money. My Firebird engine has KB pistons, Total Seal street rings (The gapless top rings didn't exist yet when I built my engine or I would have used them) and a compression ratio of 9.14:1. You cannot turn the engine over by hand because it will push the wrench back where you started when you try to ratchet it back!
+1 on the head bolt sealer on the bolts. All 17 head bolts on a small block Chevy go into water.
The ARP-100-9904 thread sealer is $10.99 as of today at Summit Racing
https://www.summitracing.com/parts/arp-100-9904

You WILL have coolant in the oil if the bolts aren't sealed.
There are mistakes on the Summit website. What is the part number for the bolts you purchased?