ARE ANY OF YOU GUYS ON HERE MAKING GOOD POWER WITH 400-406-408 TPI OR EFI SBC.IF SO WHAT ARE YOUR ENGINE COMBINATION if you have a 383 stroker dont reply 400-406-408 TPI OR EFI SBC only.

 

Don't SHOUT

TPI on 400+ cube engine can't breath; strong bottom end no revs

Compare the Hp graphs here on a 383 with different intakes
http://www.compcams.com/Community/Ar...?ID=1737510521

 

do you have a 400 block or a 383
sbc

 

Is there anyone out there that can give a better detail explanation

 

What heads and cam and what rpm range/power goal you wish to acheive?

Biggest baddest shelf tpi units will be extremely torquey but done by 4000-4500 on a healthy 400". Big cam and heads would hang power on past its peak tho but would eventually drop off

Miniram works well on big inch motors. Good torque but powerful top end. If you are looking for upper rpm performance miniram isnt bad. Expensive tho.

Best bang for buck i think is a good efi singleplane like victor e efi or similar. Few out there to choose from. As said before in your other thread, victor e picked up 2mph on a mid 10 second 500+ whp car all motor over a miniram intake. That was my friends setup.

I also run it on my turbo car with a 401" motor and its great. Seems to have decent air fuel distribution and makes power. Longer runners than miniram so more torque but larger ports to flow more for power. Best of both worlds

You need to define your motor specs and application to see whats best to use

 

if I were building a 400 with my own money and it HAD to be efi. id probably use a modified carb intake with a tbi on top. and if i planned on making any real power consistently and safely with a 400+ cid. id probably invest in a shiny new bowtie block as well.


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the power range i am trying to make around 470 hp i prettty much know that i will make a lot of torque.what was the rpm range did the single plan intake make its power and was the torque output

 

Check out my sig.

I use the TPI computer with a LT1 converted intake(mini-ram) with a 400sbc(virgin block with dished pistons)

I am low 12's on the motor now.

If I put in a set of flat top pistons, I would be in the 11's no problem.

 

If i remember right it made peak hp in the 6300 rpm range? Car was somewhere in the 480-490 whp range before and 521 after. Do not recall torque output but like mid 400's

 

The Jeep/off-road guys LOVE TPI/406. Diesel-like torque.

 

Why bother ?
You still have all the problems associated with a " wet" intake
You can buy a proper off the shelf EFI intake like the Victor E and use a 4bbl TB

 

Problem is that you have to use their intake with the MPFI system like the Edelbrock above...

If you have a TBI system, you can use essentially any intake - which may prove more useful than a multi port system... Both have pros and cons.

 

I have yet to see a real power house tbi setup tho....

 

what type of power are you making with that intake,I may use it for my 408 sbc

 

A whole hell of a lot more than a long tube runner setup thats for sure
You got cubes so no need to crutch for low end torque. ..go for the power

 

There are quite a few of them out there. Essentially you take a strong carb motors and swap the carb out for a TBI unit and tune it. That's simple as you can get.

 

I have a guy now that is currently porting out my entire tpi intake i found the guy on race junk.He is port matching everything and siameasing the lower intake by 3 inches and removing the divder in the slp runner and upper plenum.he did it for a damn good price i couldnt refuse.

 

what did you have to do to get your lt1 intake to work on you 400sbc

 

Seen those tests done and never competes with carb setups or port injection. What does seem to work is shower type injectors high up the runner near the plenum. Sorta acts like carb and works great at wot but low air speed part throttle conditions are terrible. Best combination seems to be like the japanese sport bikes who use some port injectors and some shower type injectors at wot. Get best of both worlds but true tbi style doesnt seem to perform