r3pp3r

http://www.holley.com/HiOctn/ProdLin...FMS/SR/SR.html

ditchbangr

There have been a couple write ups on the HSR in camaro performers and I just got the new chevy high performace issue and they install the hsr on their project camaro. My machinist does alot of dirt track carb. stuff around here. When he did the 406 for me and I dripped off the HSR for it you should have seen his eyes they got as big as 8 balls. It is a pretty trick looking piece, especialy the base. We kinda live out in the sticks I guess, for performance cars here in MN.

ditchbangr

DP

grumpyvette

the one major factor most of you are ignoring is that all the intake manifolds are designed to operate at differant rpm ranges and if the compression and cam used does not exactly match the intakes rpm range the intake will produce far lower numbers!

my PORTED STEALTH RAM produced far better power with both a CRANE 119661 and CROWER 00471 than with cams that worked correctly with the PORTED TPI with high flow runners

grumpyvette

the one major factor most of you are ignoring is that all the intake manifolds are designed to operate at differant rpm ranges and if the compressionratio fails to be correctly matched to the cam and if the cam used does not exactly match the intakes rpm range the intake will produce far lower numbers!
then your also ignoring the fact that once the intake flow exceeds the heads flow potential , the intake will show no significant gains past that level significantly reducing the hp/tq numbers the intake test will show yet the intake still may have far greater potential and the fact that the larger the displacement and higher the compression the more effective the high flow intakes become!

my PORTED STEALTH RAM produced far better power with both a CRANE 119661 and CROWER 00471 than with cams that worked correctly with the PORTED TPI with high flow runners

Rockin-Iroc

You make sense. You are absolutely correct. It's all in the combination. For most people, a perfectly-matched ported TPI would feel very adequate and quick in their street car. But I can completely see the potential of the Stealth Ram. I might try a Stealth Ram myself when I stroke my engine to a 383. I'd also like to get a pair of those Vortec heads. I'll probably get iron and then ceramic coat the combustion chambers like I did the Corvette's big block iron heads. That will add some additional octane tolerance.

DON 88T/A

The Mini-ram "only" peaked at 6200...
I've seen other MR combos pull much higher...if they were using unported trickflows like mentioned way back along with a smaller TB it would have really held back the MR.
The stealhram is a nice peice but was done @6000..yes it would have faired better with a bigger set of heads too...the MR held 500hp for 600+rpm's...
Like said above each intake has its strenghts..put a set of hogged out afr210's on that motor with a solid roller..and then you'll see what the MR is made of.
The fact that the MR only made 50 more hp then the TPI is very telling of how choked it was up top...big cams are great..you need big heads to work with them.

Red Devil

That was from the magazine themselves, so yes, the TFS heads were unported.

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Bill Speed

What happens in the octane range? Many magazines hint at just going for a LS1/LT1 or other engine with more modern attributes. Both projects look relatively costly in a car known for traction problems and body flex (unibody! ha)
I'd be looking to stay at 91/90 octane and going to a max 350HP increase, just to keep the car economic, also being a daily driven convertible. Low end torque tends to suit me.
Bill

Rockin-Iroc

This is just my opinion, but if low end torque suits you best, then the stock-style tuned port is probably the best option for you. However, you can update the heads to something like a Vortec head, which will give you the best bang for the buck. And then definitely get a better cam. The stock cam leaves a lot to be desired, it is TOO mild. My stock tuned port responded beautifully to the Iskendarian 270 Mega-Cam. I also zero decked my block and shaved the heads to get 10:1 compression. (This is on a 350).

Maybe at the most, you would want to upgrade the tuned port tubes to larger tubes, but the stock tubes DO build nice torque, and if that's what's important to you, then the above modifications might be good.

GMPP sells a crate motor with Vortec heads that makes 330 hp with only 9.0:1 compression. This is pump gas friendly at any altitude. Some magazine had managed over 400 hp with these heads at a higher 10.4:1 compression. (Hot Rod, I think). So your goal of 350 hp is possible. I'd like to swap my ported stock heads for a set of Vortecs myself. I think I'd see a large gain.

okfoz

The problems I forsee with the Vortec heads is the following:

1) The available lift on them is limited, I think the highest cam lift is about .490, so you need to modify them to accomidate higher lift cams.

2) The bolt pattern is different than the 87-95 standard SBC, and either you have to modify the head to bolt to the intake, or modify the intake, or get a different base (I believe Scoggin-Dickey or something like that makes one).

Otherwise I would have already gotten a set.

John

Dave Farr

for those of us that value the info presented in 3rd gen but prefer trucks, what is the best choice for mid range torque. have an 89 k1500, 5.7l, vortec heads, 700r4, 4.10, 31" tyres, 6000lbs, currently with edelbrocks tbi to mpfi conversion kit and ported tb flowing 640cfm- works well but always liked the tpi looks but not the rpm limit, need to pull to 5500rpm. i like the engine masters competition- its not the peak power, but the area under the curve. was thinking of the hsr but am afraid of loosing too much grunt down low. am going to use an engle hyd roller 477/479 206/212 @ 050-114 deg, too many problems in the past with low vacume and speed density.

robsgta

Go with a stroker crank a 383 or 396 will help pull that truck with a lot more umphhh.

__________________
Turbonetics T-76/Qtrim,4bolt block,383steel scatt crank&eagle 6"rods" forged JE pistons,internally balanced,edelbrock 2.02 heads,1.6 crane gold dual rollers,Accel billet distributor,Acell8.8 wires,crane hi 6 ignition msd blaster 3coil,SLP1 3/4 inch S.S. headers ceramic coated.4inch mufflex exhaust,BBK 58 Mill throttle body,Gutted and smoothed plenum, modified MAF,160 both fans& thermostat,Cold air W/K&N air filter,224/224int exh.@ 500/510 lift 214 center comp cam, hi out fuel pump +procharger in line pump,pro sfi dampner and flywheel, south side sub frame connectors,polyurethane everything,Harwood 2 1/2inch cowl hood.


Damn your car moves FAST ! Every time I pass you by !!

Rockin-Iroc

And switch to TPI. Best truck motor GM ever made...except that they didn't put it in a truck.

I am pretty sure I've seen base plenums for sale from GMPP for the Vortec heads. Plus for a small fee, a good machinist can easily machine the Vortecs for larger springs. Or you can buy them that way, already fitted with larger springs.

kdrolt

I think the proper saying, as I've heard it is:

"TPI - the best truck motor GM never made."

On the converted LT1 intake -- if you look at a Miniram, inside & outside, it's virtually the same as the LT1. So I would expect similar results for the converted LT1 intake as for the Miniram.

Dave Farr

well with fuel prices topping $1.05/liter here the 350 will stay a 350 i almost went 383 but didn't. collecting pieces for torque via edelbrock/vortec base, slp runners, will try a 48mm tb first, 24pph ford injectors should get me in the ballpark. by the way looking for 89-92 hi flow runners...

vbMike

This is kind of a dumb question but whatever. I have a 87 L98 350 that I plan to put a ati supercharger on as soon as I get the money. Right now the car has the stock TPI intake. My question is, if I supercharge the engine and then later switch to the TPIS bigmouth base, larger tube runners, a 52mm throttle body, and ported plentum will this increase the hp if the engine is already supercharged. I assume that it would help but when I think about it like if I ramming 9lbs of boost down the stock intake or 9lbs down the TPIS in take will is make a difference. After all 9lbs of boots is still 9lbs or am I thinking about this wrong. Will the TPIS intake allow the air to be more free flowing and there for give me more power?

okfoz

vbmike
I did not know that there were Superchargers currently available for 85-87 F-bodies. Or are you converting over to the serpentine belts from an 88-92 car?

John

robsgta

Vb Mike thats a good question.
Anything that helps speed the velocity(porting but mostly polishing intake) of air or increases the density (intercooler)flow of the boost entering your motor will give you additional horses.
If you get a 9lb boost ATI and a boost gauge, your going to see that it doesnt necessarily guarantee your going to get exactly 9lbs of boost . Every ones set up is going to be a lil bit different according to and inluding the angle of bends that the air flows the diameter of the tubing and any obstructions will impede air flow like Maf screens left in size and type location of the air filter used.
Try to get a good exhaust as well I collapsed a single 3 inch flow master with a 12 psi ATI a few years back, made me think I blew my motor when it happened.

VincentZ28

Paxton makes a S/C for 85-87 TPI cars. It's been around for about 17 years.

vbMike

As far as I know the paxton kit for the 85 - 87 has been discontinued. I am planning on doing the serpentine swap. I alread have hooker headers and a 3 inch hooker cat back so I'm all set there.

Hey robsgta, so your saying that a new intake will help out with the hp even with the supercharger? Do you think the intake gains would be more or less with the supercharger than without the supercharger? I'm just trying to figure out if the money for a new intake is going to be worth it if the cars going to be supercharged.

Acceld Z

.......and sucks the big one compared to the ATI or Vortech gear

Rockin-Iroc

I drove a Paxton centrifugal supercharged 305 TPI IROC-Z Camaro before I bought the IROC I have now. At lower rpm's the 305 still felt like a 305. But in the midrange to upper rpm's, the centrifugal supercharger would start "pulling" and the 305 started to feel impressive. I also noticed that the tuned port engine, which normally would have fallen on its face around 4500 rpm in stock form, pulled much higher than 4500 rpm with the supercharger. It was obvious that it WAS force-feeding the engine beyond the tuned port's designed rpm range.

However, larger runners, base plenum, ported top plenum, and larger TB would definitely make a difference. You would see an increase in power as a result. Just as without a supercharger, opening up the flow into and out of an engine results in power gains.

One place to look for a supercharger is in swap meets. I always see several various superchargers for sale there, and for bargain prices, compared with new. You could also check on e-bay, but it's harder to get a good deal on e-bay. There's always someone with more money than you willing to spend stupid money on anything and it's kind of hard to win bids.
But you could get lucky...it's worth a try for the savings.

robert1

Did anyone ever figure out how to get all this info to print in a normal frame? Thanks.

Thirdgen89GTA

Little button down at the bottom of this page called "show printable version"

__________________

Toys: 89' GTA | Hyper One Seven | Inferno GT | Jammin X1cr | HB LSP-R

robert1

I tried that, and have wasted a bunch of paper! It's also different because of some post widths. I just printed a few pieces of certain pages that I needed. Thanks anyway.

Thirdgen89GTA

You can always print just the images themselves.

Here is another option.

hit the printable version, then select the text you want to print. Right click on the text you want to print and select "print" from the pop-up menu. Then under page range in the lower left hand part of the dialogue box click "selection".

It will only print the parts there were hilighted.

__________________

Toys: 89' GTA | Hyper One Seven | Inferno GT | Jammin X1cr | HB LSP-R

robert1

I had two problems with that too. When I right-clicked, "print" wasn't highlighted for me to click on. Once the printer was open, "Selection" wasn't highlighted either. Ah, I'll just skip it, and read it when I want to. Thanks again people.

grumpyvette