87v6Bird

iTrader: (1)

From the July 2016 issue. I don't see a link anywhere on their website for the article so I've scanned in a copy.

They built a 383 with an Edelbrock base, "stock" runners, XFI280 cam, and AFR Eliminator 195s and made 384/454 at 5800/3200. I say "stock" runners because the middle left picture on the last page clearly shows Edelbrock's Hi-Flo runners on the engine.

It's nice to see a TPI engine get an article but I have to say I'm a little suspicious about their numbers... At least from what I've read here on making power with TPI.

https://drive.google.com/open?id=0B1...zkzUERyYmQ5SUU

TTOP350

iTrader: (8)

I read that as well. Interesting results.

someone972

iTrader: (2)

Suspicious number perhaps, but cool nonetheless. Where could I pick up one of these time traveling future magazines?

87v6Bird

iTrader: (1)

Haha. I don't understand why the July issue of magazines is now out two months early. I did a double take myself when I was typing up my post.

TTOP350

iTrader: (8)

That's how all magazines are, generally a 3 month lead time.

Orr89RocZ

iTrader: (20)

I dont see the edelbrock runners on there

And 384 hp on 383 inches is NOT impressive. I certainly can believe that. 5800 rpm peak seems high however

skinny z

I'd agree. Especially considering the AFR 195s and cam. They apologize more than once in the article for the limitations of the stock TPI intake. It seems to me that with the Lunati forged rotating assembly, there's more in the works for this engine. Another 100 hp isn't unreasonable. Goodbye, TPI.

TTOP350

iTrader: (8)

Only see the runners in a couple of small pictures. From what I have heard they don't help much anyway unless major port work has been done.

Orr89RocZ

iTrader: (20)

Yeah you can clearly see the stock type runners in those pics. Those are not edelbrock

This is edelbrock

TTOP350

iTrader: (8)

Page 48 of the mag, look at the top and middle left of the page pictures, I had to look two or 3 times.

87v6Bird

iTrader: (1)

Some of their pictures definitely have the stock runners, no argument there, but the middle left picture on 48 shows Edelbrock's runners. I imagine they'll do a follow up article talking about gains or lack of gains with aftermarket runners and they let that picture slip through.

As far as saying I was suspicious about their power figures, I've always been under the impression that TPI wouldn't make peak power at those RPMs. If these are believable numbers for the setup then I'm glad to be wrong. I'd be happy with a motor making them.

NufNuffZ28

iTrader: (10)

That's not that impressive, but about right. I made LOW 300s with AFR 195s and TPI at the wheels.

Orr89RocZ

iTrader: (20)

It was hard to see on my phone screen. Maybe those are edelbrocks

Anyway the cam and head package is enough to turn 6500 rpm. What probably is happening is power is peaking near 4500 but flatlining out to 5500+ so they quoted more rpm than what its really peaking at.
Or theres a slight chance it hit a harmonic wave point at the given runner lengths and a slight blip in power occurred up that high

Regardless, swap to a single plane efi and large tb, it will make 100+ hp more

scooter

iTrader: (11)

Those are definitely stock runners in that picture on the LH side

Steve Mack

iTrader: (5)

Read the sticks up top on ten times the torque. The article says they got 400 horse with stock runners.The Edlebrock runners only made 25 more horsepower.

Ty92Z

iTrader: (11)

Was that a stock TPI? I would be happy with that. I was considering the Edelbrock setup, but for price vs. gain I may stay stock.

Steve Mack

iTrader: (5)

Just go to the top of the page and read TPI shoot out.You would be surprised at what they got out of a stock TPI setup

Orr89RocZ

iTrader: (20)

Yeah but also surprised how much you leave on the table for the same amount of money or so for heads/cam/motor internals

You build a 500-550 hp motor but only make 400 with stock tpi. Thats not getting bang for buck

Steve Mack

iTrader: (5)

I have a saved a car magazine article that used a ported stock base .ported 113 aluminum heads .ported plenum TPIS runners larger throttle body .They got 458 horsepower ,534 ft.pounds of torque with a 383 engine. The article is from a 2007 Super chevy mag.I'm not saying this is the way to go.Just that there is more to be gotten out of TPI than people think.Like I said Read the sticky at the top of the TPI post.I know you have done a lot of different setups and got great results.

Street Lethal

iTrader: (16)

Something is wrong with their numbers, can't see horsepower peaking that high w/stock runners. Would love to see a dyno graph.

NufNuffZ28

iTrader: (10)

ported stock base, SLP runners, stock ported TB, and stock ported plenum.

You do leave a TON on the table, but with my TPI experience, nothing helps that much staying TPI, unless you go to extreme measures.

87v6Bird

iTrader: (1)

I didn't really catch it at the time but they mention in the caption on the first page that this was a former GM High Tech Performance project car. Well, today a search for 383 TPI turned up the original couple of articles for the car/engine. It looks like they mostly assembled it back in 2013 but it was never completely buttoned up and ran until now. It doesn't look like they changed anything engine related from before.

Here's the original articles:
http://www.superchevy.com/how-to/eng...ious-for-more/

http://www.superchevy.com/how-to/eng...oject-top-gun/

luvofjah

iTrader: (2)

There was an old TPI Shoot out article where they tested stock, and then started changing components, high flow base, then runners, etc...
One motor made over 500 tq (Don't remember the hp#), I agree that the cam they picked is not best for TPI setup, and for sure not the stock runners... Would be nice to see what an "optimized" setup would do...