They have aftermarket TB's, Runners of all sorts, intake manifolds, injectors, etc. There doesn't seem to be any high performance plenums... just stock plenums that people port out for you. I know the Accel SuperRam has a new plenum to it, but you can't just go out and buy a SuperRam plenum... the plenum and runners are one piece, and almost $800 at that.

I don't know where this came from. Just reading other posts made me start thinking about it.

 

I'd suppose because there really isn't much you can do. The runners have to connect at a certain point, the throttle body has a certain size. Only thing they could offer in an aftermarket plenum is what can already be done through porting.

 

I remember when I bought my 1st GTA in late 88 there was a magazine that tested several intake systems on the TPI.
The only 2 I can remember in the test was the SLP runners and a company I think called MRP.
The MRP system was runners and a plenum but they were made out of a space age plastic like the newer LS1 intakes.
I remember they tested pretty good against the SLP runners and the other products.
I do not remember anything else about them and have not seen them since the article.

 

I think Lingenfelter has heavily worked stock plenums... but they cost around $300 - $400 I was told. That would be my guess for the "ultamate" plenum on the market.

When my car was still using a TPI intake, I always thought about trying to fabricate a sheet metal TPI plenum that was the same width as a stocker - but taller to add plenum volume. But, I figured the costs far outweighed the potential gains.

 

Lingenfelter is crazy with thier prices =P

What I would do is buy a stock plenum off ebay and learn to port. Not hard (so i hear) and you can port the living hell out of it without fear cause if you break it you have the backup already under the hood.

 

The only aftermarket one I have ever seen is the plastic one from MRP

 

I saw one of the plastic ones on ebay about a year ago. I don't think an aftermarket one is needed. All you have to do is port the front out to match the throttle body, and port the sides out to match the runners. Anything else you would do would be pointless.

 

The plenum isnt really an issue on a TPI. The runner length and small passages in the base, coupled with wonderful transitions are.

 

Accel sells an aftermarket plemun, runners, and baseplate

 

 

tpis sells port matched plenums for the 52 and 58mm throttle bodys and large tube runners that they sale its like $85 but I think you could have it done for less if you can't do it your self

 

Check out the CorvetteForum. There is an engine builder, Jeb Burnett, who is in the process of building a new TPI intake setup. Go to the C4 Tech/Performance thread.

http://forums.corvetteforum.com/zeroforum?id=48

Single Plane EFI Manifold, etc.

Using a carbed mainfold and grafting a plenum on it. There are lots of photos of it too. He plans to sell them when completed.


Jake

 

Those are some great pictures! Where did you find them (besides on TGO)? I eould guess that that composite material plenum and TB would not only flow extremely well, but would also retain much less heat.

 

MRP has been gone a long time. Only way you'd find that stuff aside of pictures is used.

There's also the First stuff, but again there is little different, and its aluminum like the TPI.

 

I really dont think that you could outflow the actual plenum? The runners and base yes, but the plenum just houses the air. There is a company that makes an aftermarket plenum. They use a large LS1 style TB and I belive the plenum is longer and larger. Also, the TB can be placed on the front, or on the driver side of the plenum. Dont know how much it is, but im looking for it on line.. give me a sec to pull it up....

I couldnt find the site, but found this guy putting the F.I.R.S.T TPI unit on his car... here you can get a good pic of the plenum and tb.

http://ncarboni.home.att.net/NCtpi.html

Hope that helps JR.

for sale too: http://www.affordable-fuel-injection...-injection.htm

 

i took those pic. i got the parts used just cause i didn't believe my friend when he said he knew someone selling them.

the TB flows like 1300 cfm the plenum i have no idea but i'm going to let a friend try them on his 91z28 its mostly stock 305 5speed. he should have it in the low 12 high 11s on the spray soon. .. we'll see if it helps.

the TB is going on my blower car when i ever get it done.

 

if i remember right i was reading a book in the book store one time about plenum size and it said it wasn't only about flow, its kind of a reservoir for air. had something to do with pressure waves the take place in the intake because of the valves slamming shut. and a wave reversing back up. the plenum volume cushioning that or something like that. its been a few years

 

Yeah, thats where the "tuned" in Tuned Port Injection comes from. The runners are tuned for pressure waves to bring the air from the plenum down the runners.. or something like that.

 

Yep, the critical thing with the plenum really is the volume.

 

The plenum is a major reason why the Superram is so successfull. I have always thought the stock plenum to be to small, hence the reason it gives up the ghost @ ~mid 12s and the Superram puts many cars into the 11s. Granted the Superram runners are 3"s shorter but the plenum is twice as big and smooth inside without the turbulence causing casting like the stocker. Not to mention the Superram runners are huge and act like an extension of the plenum to a certain extent as they tapper down to meet the base. Almost like a velocity stack. Thats what makes it Super, LOL!

But thats just my .02

 

isnt there a accell plenum like the box that somebody else makes--lingenflter maybe?

 

The Accel/Ling Super Ram... yeah its the same thing.

 

Yeah engineering meets mass marketing.

Lingenfelter designed it over a decade ago for custom cars he tuned and built.

Acell has brought it to the public through large scale product casting and production.

However they are not mass produced and carry a lofty price tag, keeping it an exclusive custom piece. But it does carry nice credentials as far as performance and predictability.

Anyway, can you tell I have a Superram motor, LOL!