[charlie66]

Originally Posted by David Holmberg

You're at the same stage I was at, any more and the streetability would suffer.

In order to make more power and keep it pump gas and lower RPM's you need more cubic inches.

To keep it simple I'd send the heads to a quality porter for work then let them pick the cam. There are some good choices up in your area.

I would love to build a bigger motor, but for now I thought I would see if I could get more out of what I have. I didn't know there were any Pontiac head porters in my area. I'll have to look into that. Who are they? If I could get a worth while amount of power out of some changes, I would trade some streetability. Do you think there is a better choice of cam for the head flow I have? If it was 15 or 20 hp I guess it wouldn't be worth it ....

Maybe ill just stick with what I have and just hit it with a bigger shot. I never sprayed at the track yet.

[charlie66]

Originally Posted by 66bonne

What torque convertor and stall ? I may have missed it but what is the rear gear ratio ?
What tires do you plan on running ?
Sounds like you got a good thing going.

Jim

10" 3500 stall. 315 drag radial 4:11 gear 35 spline with spool... Turbo 400 w/break

[charlie66]

If I can run a 10.00 on motor. What do you guys think it would do with a 150 or a 210 shot? It really seems to like the 150.... Feels like twice the car on motor...

[BruceWilkie]

You say your solid cam wants to rev more. Have you run shift loops to find your best shift points?

FWIW more convertor could make a huge difference. (over .2 improvement of my 60's for me!)I had an 8" that flashed to @ 5200 yet actually ran 200 rpm lower at 55mph over the bridge headin out of town to my "test site".

Old convertor was a TSI 10" @ 3200 flash speed. 8" was unused Turbo Action from a "divorce" sale...originally speced for 4400 stall behind a fairly hot SBC 355 2nd gen Camaro.( I couldnt ignore the less than 1/2 price bargain)

Not much flair at take off if just driven lightly. (Less flair than the TSI) Stage weight averaged 3910 btw. I ran 4.10 gear with 28" tire. Tried 4.56 was too much. Iron D port 440 combo. 11.78/114 1.52 avg 60's from 1.78 best with old convertor.

TurboActions convertor reputation isnt what it once was. I'd look elsewhere.

[David Holmberg]

With 4.11's you'd probably run out of gear on the bottle.
There's no way to know for sure, but you'd be deep in the 9's on a good pass.

[charlie66]

Never been to the track with the new cam. It seems like first wants to sift around 6400 second likes it over 7000. Third, I don't know where I am yet. Most likely around 6100 at the stripe.

I have thought of a higher stall, but never tried it.. Now that im spraying it I thought I would keep it where it is. In reality I should tighten it up if im going to go higher then a 150 shot right?

[David Holmberg]

10.0 = 135 ish NA. 9.35 = 145 ish bottle.

If you're comfortable shifting at 7K you'll be ok, depending on the converter slip.
I was running 135 with 3.42 gears and 6300 through the traps. (bad converter)

[charlie66]

Originally Posted by David Holmberg

With 4.11's you'd probably run out of gear on the bottle.
There's no way to know for sure, but you'd be deep in the 9's on a good pass.

That's what I figured too. Believe it or not the gears seem to work good on the bottle. I raced a gsxr 1000 over the summer and all I can tell you is I hurt his feelings pretty bad ..... Ha ha...

[charlie66]

Originally Posted by David Holmberg

10.0 = 135 ish NA. 9.35 = 145 ish bottle.

If you're comfortable shifting at 7K you'll be ok, depending on the converter slip.
I was running 135 with 3.42 gears and 6300 through the traps. (bad converter)

I would be happy with that.

I think we figured 6% slip with my slower combo.

7k is no problem . I shift 73 all the time. It wants to riv higher but I don't.

What do think your % of slip was?

[David Holmberg]

15-16%.

I was using a TCI 3600. That motor went into another car and went 10.29 with a better converter and gear @ same weight +/-

[screamingchief]

Well,here's the thing,while the current cam may not be ideal for nitrous,I would be far more worried about other areas like ring material and end gaps vs. the cam when trying to figure out how much hp it'll handle from the kit.

If using plasma moly rings w/NA end gaps,that's more of a limiting factor than the cam will EVER be.

But yeah,if looking to hose this thing hard,you got some decisions to make.

And like David said,the 4.11's likely wont be the best ratio when running on the kit,but that's also not the biggest area of concern either.

You're at one of those "fish or cut bait" moments with this combo.

Concetrate on making slightly more hp NA and let the nitrous remain a very small part of the combo.

-or-

Refine the combo in a few select areas so it can handle a sh!t ton more spray.

And understand they really are two seperate paths @ this level.

Especially when it comes to areas like torque converter selection.

FWIW

Bret P.

[rod cole]

For reference My car that is similar weight goes from 10.70 to 9.90 on what is supposed to be a 150 shot. .071 jets fuel and nos. And not reving well because of the hydro roller. Goes from 125 to 135 mph. So on track with the spray you will get bumped without more cage and safety. I am on regular 10.5 28 et streets 3.70 gear. Rod

[charlie66]

Originally Posted by David Holmberg

15-16%.

I was using a TCI 3600. That motor went into another car and went 10.29 with a better converter and gear @ same weight +/-

Yeah that's a lot of slip. What was your mph?

[charlie66]

Originally Posted by screamingchief

Well,here's the thing,while the current cam may not be ideal for nitrous,I would be far more worried about other areas like ring material and end gaps vs. the cam when trying to figure out how much hp it'll handle from the kit.

If using plasma moly rings w/NA end gaps,that's more of a limiting factor than the cam will EVER be.

But yeah,if looking to hose this thing hard,you got some decisions to make.

And like David said,the 4.11's likely wont be the best ratio when running on the kit,but that's also not the biggest area of concern either.

You're at one of those "fish or cut bait" moments with this combo.

Concetrate on making slightly more hp NA and let the nitrous remain a very small part of the combo.

-or-

Refine the combo in a few select areas so it can handle a sh!t ton more spray.

And understand they really are two seperate paths @ this level.

Especially when it comes to areas like torque converter selection.

FWIW

Bret P.

That's a good point you make about the rings. I'm not a nos guy. Never was. So when I built the motor I filed the rings for n/a gaps. But I've been through 3 bottles so far. 1 bottle was with a 210 shot and had no problems. Lol.

But anyway, You're also right about the converter too. Mainly, why I want to make more power n/a is because I don't want the nos. But from the answers im getting here it doesn't look good for the n/a increase for additional power. So it looks like either nos or turbo for me now... I guess I have to think some more on it for now...

Thanks to everyone for helping me figure this out...

[charlie66]

Originally Posted by rod cole

For reference My car that is similar weight goes from 10.70 to 9.90 on what is supposed to be a 150 shot. .071 jets fuel and nos. And not reving well because of the hydro roller. Goes from 125 to 135 mph. So on track with the spray you will get bumped without more cage and safety. I am on regular 10.5 28 et streets 3.70 gear. Rod

Cool. Sounds like a fun car.

Thank you...

[Jeff Kinsler]

converter seems to tight to me.

[PONTIAC DUDE]

I recommend the SD Performance 342 cfm heads along with his modded victor intake using their modded 72cc chamber to what ever compression you want to run.
Bigger cam on a 112 LSA.
Dominator is a must if you plan on 10 flat or quicker. I recommend Pro systems and tell him your combo.
Gear and converter are a must. Call PTC. They work right out of the box!! You can run around a progressive 200 shot with a N/A converter but can start blowing thru it depending on the design.
Same with gearing and rpms N/A as compared to quicker ET's and nitrous.
Open up the wall clearance for bigger shot. Same deal on the rings. More gap in your second rings too. Napier 2nd with lower oil ring tension.

If your gonna try more then 250 hp with std Ross pistons. Coated the tops ad use the nitrous type top rings.

[PONTIAC DUDE]

Originally Posted by rod cole

For reference My car that is similar weight goes from 10.70 to 9.90 on what is supposed to be a 150 shot. .071 jets fuel and nos. And not reving well because of the hydro roller. Goes from 125 to 135 mph. So on track with the spray you will get bumped without more cage and safety. I am on regular 10.5 28 et streets 3.70 gear. Rod

Just a question. What issues do you have with reving and your hyd roller?

[LiL Jack]

Originally Posted by Jeff Kinsler

converter seems to tight to me.

That is perfect for the jug!

[charlie66]

Originally Posted by Jeff Kinsler

converter seems to tight to me.

What would you recommend ?