Beach Bum

Can you get a stock unported GM TPI manifold, runners and plenum into the 11's with a naturally aspirated motor ?

This is the question of the day ??

cheers,
Beach Bum

flyersfan1088

I would say the only way to accomplish that would be with lots and lots of cubes.

FasterCheaper

Try to siamese that badboy. There is some surprising power to be had by knocking out the wall about halfway into the base. Add a ported plenum and runners and maybe you have enough power to scrape into the 11s? Could take some heroics in the traction department though. Not sure, but wanted to add that to the debate. This can be seen on thirdgen.org
[url=http://www.thirdgen.org/techbb2/showthread.phps=&threadid=47263&highligh t=siamesing%20stock%20intake]


[Modified by FasterCheaper, 2:06 AM 6/28/2004]

hippy

I doubt it even with more cubes. The larger the ci motor the faster that tpi will fall on it's face in relation to RPMs. Naturally aspired I say no way.

Oops, can you spray it?


[Modified by hippy, 8:29 PM 6/27/2004]

Corvette0096

Yes you can!! Buddy does it with a 305 in a stock eliminator class.

Vic'89

Todd

I bet if you put that STOCK TPI on your Vette, you will run high 11's.

Vic

Beach Bum

Guys,

I had to give back my borrowed Miniram..... so in order to make a Points event, I slapped on a stock untouched TPI manifold, runners and plenum.

I ran 1.58 - 12.02 @ 110.7 Track elevation was 900 feet, DA was just about 3000 ft.

It could have easily run into the 11's, but, my transmission was shifting at literally 6000-6200 rpm..... I couldn't get it to shift any earlier.... and trust me, this thing needed to be shifted down around 4500 rpm or so.... thus the motor for the shifts was just making a ton of noise with no pull at all.... this hurt et, but hurt mph just as much. I think if I was able to get it to shift below 5000 rpm, 11.8 @ 113 mph could have been realized in this bad air.

Not bad for a stock TPI ?? I was a bit surprised.... I take back everything negative I have ever said about long tube runners !!

They are coming off and a new intake is going on, so this was my one and only test with them.....

cheers,
Beach Bum

ToniH

Beach, can you please post your motor specs or a link to your site if you got one. It would be interesting to see what combo will run that fast with stock TPI.

Thanks, ToniH

Beach Bum

Toni,

I do not have a webpage anymore. My set-up is a 383, lpe 74219 cam, 1 3/4" headers, AFR 190 cylinder heads, 3000 rpm vig conveter, 3.45 gears, stock 700R4 tranny.

As a comparison against other intakes, within the last month on this same track, and in similar weather, the Superram ran a 1.54 60 ft - 11.47 @ 117.8 mph and the Miniram ran 1.61 60 ft - 11.66 @ 116.6 (untuned).

I'd upgrade the stock TPI if you're running it.... but all things considered, I thought it did pretty good last weekend.

cheers,
Beach Bum

Corvette0096

Todd, You Super ram intake was ported from what I remember. Who did the port work on it and how much?

Beach Bum

Hi corvette0096,

I purchased this particular Superram already ported.... it was done by a well known Buick GN tuner on the west coast. I don't know what the cost was, I didn't pay for it. If I get another SR.... I'll port it myself and have it flowed.... I think they're obviously a pain in the rear to port by hand.... but maybe worth it.

cheers,
Beach

65Z01

Beach Bum, with your motor you should siamese that stock intake base; it will pull strongly to about 6,000rpm though you will lose a little low end torque.

I have a 2" deep x 1" high cut into the intake base partitions along with a small cut into the lower runner partition for smoothing. I gained 20chp at 5,400rpm with stock heads & cam on my 350cid SBC. My A4 is now shifting at 5,200rpm & 5,700rpm and she pulls strongly to those shifts.

Details on doing the siamese mod are on my site along with pics, as are the before & after dyno pulls. I did this with only a cutoff wheel on a hand drill and various bits on a Dremel. You should be able to get it done in a day or two. I also have the upper stock runner openings flaired a little with matching openings in the plenum sides.

This should get you into the 11s with a little effort and nearly zero $$ and you can always go to another SR if desired.

Bruthish

Wow..great times for a stock TPI...I wonder what it would have done with it ported and siamesed? Interesting.....

I feel that "all noise and no go" when I down shift sometimes...very frustrating.

Beach Bum

65Z01,

Just looked at your webpage.... as a note the links to the articles that I assumed have the pictures are not working. But in any regards, I am probably not going to do it... the only reason I slapped on this stocker system was to make a points race in the Jegs ET Bracket series. (which I went 4 rounds with this thing even with the over shifts)

On another note.... Thats a fantastic webpage you have !!!! Great Job with it and I'd keep expanding on it, its a great idea with the articles.... I think many new corvette performance enthusiast's can learn a great deal of information from it. If anybody hasn't taken the time to check out his webpage.... you should !!!

cheers,
Beach Bum

65Z01

Beach Bum, thanks for the heads up on that, guess I'm in for some site maintenance...it's been a while.

ToniH

Beach, thanks for the info.

Couple of more questions:
- RR's I assume?
- stock or light weight crank, rods, pistons?
- what size injectors?
- is your car lightened or near stock weight?

Thanks again,
ToniH

Beach Bum

Hi Toni,

- I have 1.6 crane roller rockers.
- Scat cast crank, Eagle 6" 4340 H beam rods and JE pistons.... none of its really lightweight, just standard off the shelf stuff.
- 24 lb Ford SVO injectors
- Yes, I've gotten rid of some weight on my car, but unfortunately its counteracted by my 80+lb steel Rollbar.... and of course me weighing 270 lbs doesn't help much. (My raceweight is right around 3300 lbs nowadays)

cheers,
Beach Bum

ToniH

Wow, that adds up to >400rwhp! Pretty good. That is more than I expected from that combo, popular well proven parts so a safe option for us to use same parts to get good performance. Do you have any experience what kind of hp or strip performance could one expect with the exact same parts but wiithout any porting (just bolt on straight from the box)? BTW, is your block stock L98? How much does the 3000rpm converter affect end speed or does it?

Hehehe...this takes the guessing away from my engine build up plans


[Modified by ToniH, 2:26 PM 7/1/2004]

Beach Bum

Toni, I think your calculations might be off..... The superram set-up in the end probably had approxmiately 370 rwhp. The TPI set-up is somewhere around 300 rwhp give or take a little.

It doesn't take a lot of peak HP to run solid et's.

My block is a 4 bolt from the 70's..... but certainly wouldn't have mattered if it was the stock block. The converter has very little to do with the trap speed.... less than a mph.

cheers,
Beach Bum

0ski_dwn_it

Beach...

How did I miss this thread? I knew from the mailing list that you were going to run the TPI setup, but didn't know what the outcome was.... pretty interesting.

Why didn't you try to manually shift it? Probably wouldn't have been as consistant, if its not setup to do it, but it might have lowered the shift points closer to your desired.

Also if you would have 3.07 gear in there it probably would have turned a quicker ET. Since it would have stayed in the power band longer....

Its Fun stuff playing around with equipment......just wish I lived closer to the track I would do all sorta testing.

Very good test!



i will say it again....we need to get together at Dragway 42 one of these weekends. After the holiday, I say we just set a date and go. Otherwise it will be October and we will be singing the same tune.