So far I have: a pcmforless tune, headers, true duals, no cats, cold air intake.

I purchased SLP runners, going to get those siamesed, mega ported plenum from Corvetteplenums, get it retuned, and eventually do heads/cam/roller rockers and I will be buying FIC injectors within the next month. Anyone know what size I need??? I know atleast 24 lb.

I think I can reach 400 hp with the TPI.

 

I think 24LB will be fine but Jon will tell you what size u need.

 

You will have a nice product from Corvetteplenums, but
FYI. I just did a quick job on my stock stuff after I took of the SR, and it took about 20 minutes total. Not perfect but...

i took a cut off wheel, and cut out the TB ports, and the sides, than just did a quick grind on the walls behind the ports.
IMO you can do a good job in an hour with the right tools.

 

Don't go bigger than 24lb with a TPI...no need.

400hp? At the crank maybe, not at the wheels (with what you've described).

What year vette? Would be nice to see a bit more info (about your car at least) in your profile.

You planning on having Mike do both the runners/plenum?

 

PM some pics, Please or link the post. I just posted for some links on DIY PP.

Thanks, Polo!

 

Ck out my runner album

http://forums.corvetteforum.com/album.php?albumid=1682

Here is a guide
http://www.gmtips.com/3rd-degree/dox...-port/port.htm

 

TPI is doing it the hard way. I had the Edelbrock base and AS&M runners. All I wanted was 12s. Low 13s was the best I could get. Tried 2 years. Loved the stock, clean look of the TPI. Hated the R&R of the TPI. Started to disassemble it for some reason one day and after an hour I was getting to the runners. Got on the NET and ordered a Miniram. Next time at the track, 12.7s. It doesnt look as cool as the TPI but the R&R is easy and its the easiest 3 tenths I ever got.

 

He is right but it depends on what your goals are.
So what are your goals?

 

Corvette plenum says mega porting is like a superram set up. Is that not true? and it's alot cheaper.

He is doing both runners/plenum.

Ive been working on this project for some time researching and thinking about my options and saving up the $$$.

These are the runners I purchased. These will fit my 86 correct?

http://www.summitracing.com/parts/SLE-20002/

 

Those will work.
I'ts not exactly like a miniram but it will work pretty well .
You need to do something about your intake as well, then it's not cheaper than another intake set up.

 

I meant to put accels superram.

http://www.corvetteplenum.com/Mega-porting.htm

 

That was just the stock stuff, and I already put the car back together Saturday night. There are tons of porting pics, plus I posted in that thread the same thing what I did. Most don't do that, but I am being a realist about results, and I don't plan to keep it on long.

I just did it because it was off.

 

You typed it (SR) correctly the first time. Chaos replied with MR by mistake (I think).

If you've seen and reviewed the TPI Shootout article entitled "Ten Times the Torque", you'll know the answer to CP's claim. You should be able to get close with manual porting of an SLP setup, but it won't be "the same".

The biggest difference (IMO) is the size/config of a SR plenum vs the SLP mega-porting option. The SR plenum is considerably larger. Plus, all of the runner entrances are on the bottom -- where interaction from adjacent runners might be minimized. With the standard TPI plenum, runner entrances are closer and face each other. At higher rpms, I think the turbulence of intake (reversion) runner pulses causes a small reduction in the peak potential of the mega-SLP vs SR option.

Again, refer to the article and you'll see the power difference. For a non-racer, the difference is minimal. For a racer, they'd never consider the mega-SLP anyway. I'm not sure how many would even pick the SR over a MR (or HSR) either. It's the HP vs TQ thing.

Also, I'm not sure how far THRU the SLP runners Mike goes. I've seen pics of one of his jobs and (of course) compare it to what I did. But, I spent LOTS of hours trying to maximize the results - and enlarge SLP runner size. That's easier to do when it's for your own car. There's NO way I'd spend that much time for the amount he charges!

When you total the amount of an aftermarket base, runners, and mega-porting, I'm not convinced there's much difference between the cost of mega-SLP vs SR. But, there IS a difference in look, installation, and availability.

Here are a couple of pics on what I did:




Here are the common tools I used: (I also used flap-wheels for sanding -- not pictured)

 

You will get nice gains with those. I had them on my 86. If you are looking for 400 HP, I just dont think they will get you there.

 

yeah I goofied that one up.

I had mega ported SLPs, TPIS intake and ported plenum.
I liked it and it felt strong but I could feel my car wanting to pull a lot further than it could breathe with them so I went HSR.

If you have visual inspection or you live in Cali you have limited options.

So are you porting your intake?

 

That's some great looking work you've done there.

Where can I read that article? Does it give any actual flow numbers?

I love the look of my stock TPI but I know it won't get me where I want to go.

Does anyone know where I can get information regarding maximum flow numbers for the TPI. I don't really want to go with the Mini/Stealth/Super Rams as they will change the look too much(can't help it I was drawn to the C4 partially by the look of the TPI)

I want to be able to pull thru 5500. I am mainly looking for torque but still want to rev a bit higher than 5500.

 

You'll never see the high HP numbers with a TPI style set-up, but it will give decent torque numbers. If you set-up your car to maximize the torque you can turn decent ETs at the track. My 91 normally runs high 12s in the 1/4, but has been as low as 12.49 in mineshaft weather. This is on a bolt-on L98 with AS&M runners and an Accel base while still running stock heads/cam.

I have a LPE 219 cam and TPIS ported 113s on the workbench waiting to go in the car. I'll be keeping the same intake when the heads/cam go in the car. My goal is to regularly see low to mid 12s and maybe a high 11 pass in great weather.

 

Google "Ten Times the Torque".

No flow numbers included in article, but here's the ones you're interested in:

Stock TPI -- 200cfm
With SLP runners (as cast) -- probably not more than 210-215cfm
With Accel/Edelbrock base and TPIS/ASM/fully ported SLP/TPIs -- 225-240cfm
SuperRam -- 240cfm (as cast, with porting/honing 265cfm)
FIRST TPI -- 275cfm (with minor porting)
HSR -- 275 cfm (as cast, 300cfm with porting)

Note: Extrude honing can raise numbers above about 15%

Numbers above are approx. (And, remember.... Runner length affects results too.)

You can rev higher than 5500 with an aftermarket TPI, but don't expect power to go up any more. The ceiling for any full-length TPI setup won't be any higher than 4500-5000rpms. Shortening/siamesing down to superram length (or shorter) is how you raise that ceiling. Even a SR has a 5500ish rpm ceiling. So, most/all of the dividers would need to be removed to go above that.

Or,,,build a custom TPI with 2" or larger runners!

 

Good info

 

Thanks GreggPenn I appreciate all that...I've been researching my build for some time now and those are some of the pieces missing from the puzzle.

Thanks again
JC