I posted this on the tech/general engine board as well but havent got any replies back so I figured I would give it a shot over here.

Well Im almost done with my rebuilt engine but not sure what intake to go with. I have a 355 with pro topline 180 cc heads and a ZZ4 cam. The rearend is a 3.27 posi and I have a 2000-2200 stall as well. I was going to do alot of porting to the TPI intake I already have but get an HSR most likely in a few months. Well I have decided to maybe get the HSR now if other think I should go that route. So that is my question. The bottom end is slightly rebuilt with new cast pistons, stock rods and crank, but ARP main and rod bolts. So I know I wont be able to rev much past 6k RPM's alot. I know that the HSR's like to shift around 6200 or so usually. With the heads and cam I have, it sounds as though a ported TPI would be the way to go because each of those parts is for low to midrange power. I would have a TON of torque on my hands and probably more than I need. If I go the HSR route, I just want more airflow into the engine which will be good but more for the upper RPM power that it can give me. Will this be a bad idea with the heads and cam already picked out or will I still see gains? This is mainly just a street car but want to run with topend cars once in a while on the highway. So if anyone has anything close to this setup or can just give me advice, I would appreciate that. Also let me know if there is anymore information I need to provide for you. thanks.

 

your combo would be a reasonable close match to a HOLLEY STEALTH RAM but the ACCEL SUPER RAM would also work fairly well with that combo,

your decision should be made on the rpm range you chose to get your power in, and that max power level you chose to reach, what other mods are planed, and the cars gearing and ultimate use. BOTH ARE GOOD INTAKES, IVE USED BOTH,I chose the STEALTH RAM

the standard stealth ram costs about $460-$530 plus small base HEI ignition cost


http://www.thunderracing.com/index.c...yid=1125#P2944

http://fasterdeals.com/vette/index.html $774 plus small base hei ignition



http://www.jegs.com/cgi-bin/ncommerc...19&prmenbr=361
$1339


the HOLLEY STEALTH RAM FLOWS at 275cfm out of the box, can easily reach 300cfm with minor port work the stock TPI has a hard time flowing 230cfm even with minor port work, look here
most of this info is right off the accel,holley,edelbrock, and TPIS sites, add a little math and the results become much clearer!!!
GETTING YOUR Intake....... length ....... port in -- out
Stock GM Base--- 6.375"------ 1.47"- 1.96x1.2
TPiS base------ -6.125"------ 1.75"- 2.09x1.28
Accel base----- -6.125"------ 1.75"- 2.09x1.28
Holley base------- 6” runner 2.3”- 1.9”x 1.23 (2.337 sq inches)
Runners
Stock TPI----- -- 7.250"------1.470" round(1.70 sq inchs)
SLP ----------- - 6.625"------1.600" round (2.01 sq inchs)
Accel LTR------- 6.625"------1.615" round (2.05 sq inchs)
TPiS----------- 7.625"------1.660" round (2.168 sq inchs)
Mini ram -----3.5”
LT1 ----------3”
Runners (measured individually)
Stock....................203.17 cfm
ACCEL................242.02 cfm
Extrude/ACCEL...275.83 cfm
Super Ram............289.18 cfm
Intake manifold with 3/8 inch radiused intlet
.............................222.45 cfm
Holley stealth ram ………..275cfm
Stock intake manifold with runner
Stock....................198.72 cfm
ACCEL................213.52 cfm
Extrude/ACCEL....217.11 cfm
Super Ram............220.67 cfm
Holley stealth ram …..275cfm

ACCEL Hi-Flow intake manifold with 3/8 inch
radiused inlet.........251.51 cfm
ACCEL Hi-Flow intake manifold with runner
Stock....................215.83 cfm
ACCEL................232.53 cfm
Extrude/ACCEL....243.21 cfm
Super Ram............240.24 cfm
Extrude-Honed ACCEL Hi-Flow intake
manifold with 3/8 inch radiused inlet
............................275.83 cfm
Extrude-Honed ACCEL Hi-Flow intake
manifold with ACCEL runner
............................266.94 cfm
Edelbrock Performer RPM manifold
(Stock)..................286.51 cfm
Edelbrock Victor Jr.
.............................275.24 cfm

HOLLEY STEALTH RAM
Stock…………………………… 275cfm
Ported…………………………..300cfm
Runner lengths
Stock tpi manifold 8” runners 11.25”, cylinder head 6” total 25.25”
Accel super ram manifold 8” runners 7” cylinder head 6” total 21”
Holley stealth ram manifold 6.26” ” cylinder head 6” total 12.26”
Edelbrock performer RPM runners 6” ” cylinder head 6” total 12”
Edelbrock vic jr , runner length 5.5” ” ” cylinder head 6” total 11.5”


Now play with the figure in the calculators below, what youll find is that the if your using a 350 size engine as a guide

the tpi runner length is ideal for peak tq 3427rpm and 2700-4000rpm for peak hp

the super ram is ideal for peak tq at 4032rpm and 3300rpm-4800rpm for peak hp

holleys stealth ram runner length is ideal at 4700 for peak tq and 5618rpm to 6282rpm for peak hp

the SUPER RAM IS A GOOD INTAKE BUT ITS A TOTAL P.I.T.A. to install
the STEALTH RAM requires a custom plenum when used on a corvette but most camaros can use the standard stealth ram, both stealth ram versions are far easier to install, it flow far better out of the box, and is designed for a slightly higher average rpm range
things to read
http://www.gmhightechperformance.com...holleystealth/

http://www.eecis.udel.edu/~davis/z28...age021105.html

 

Yeah Im set on either the TPI or HSR because of the low cost and the success most people have with the HSR. Thanks for that info there however Ive seen you post it on a few other threads but it is still good info. Anyone else with input? I know there is more than just one person with experience of the HSR and Im sure some people would just be able to give me opinions on either setup. Thanks

 

Grumpy has about the most experience on this site with all of the intakes simply because he has actually tried them all.
Based on you motor specs I would not get an HSR because your motor wasn't built to consistently rev that high. A Super Ram would be better suited but it is more expensive and harder to install.

 

well our combo is similiar. i have the ZZ4 cam and ported stock heads. just put the HSR on my car. tranny goes in monday. will get dyno and track results soon. here's my new website www.stealthram.com keep looking because i will update it as i get results.

 

great...I would be very interested to see that mrr23. That may give me a little idea if it will be good or not. If you remember, hopefully you can post back to this topic for me or drop me an email. I'd greatly appreciate that.

BTW dude...those are VERY impressive numbers. Is the engine still a 350 and are they stock L98 heads that you are using and have ported? Im gonna have to look my on your site to see what you got cuz I like those numbers. And damn you must have at least 600 ft lbs of tq. Very nice. :hail:

 

there is a little help from n2o on those numbers. yes it's a 350 .060 over with ported L98 iron heads.

 

With those high numbers why is your trap speed so low? What 60ft times are you pulling?

My current setup should be roughly 320RWHP 400RWTQ and I am hitting 109-110 MPH trap speeds (auto tranny)

 

the times were on 120 n2o. the dyno was with 150 n2o. my e.t. with the 120 n2o was 12.439 @ 109.02. 1.76 60ft

 

Mrr23...could you do some dynos and track runs without the bottle? I'd like to see what you run like that or even like a ported TPI to HSR comparison without the nitrous. Actually Im sure alot of people would like to see those types of comparisons. Im sure it has been done before but for me personally it would be nice to see the difference between the two with your setup.

 

i will be doing both. most of my dynos are without n2o. only one is with. the best on motor was 13.689 @ 99.25

 

ok as promised some dyno and track times.

120 n2o shift @ 5600-- previous 12 feb 2003 shift @ 4800
60ft........ 1.855-----1.783
1/8......... 7.828-----7.920
mph......... 90.89-----87.31
1/4.........12.145-----12.437
mph........ 109.21-----108.29

150 n2o spun 50ft
60ft........ 1.958
1/8 ........ 7.937
mph....... 91.63
1/4........ 12.184
mph....... 116.62

n/a shift @ 5600-------previous 17 jan 2003 shift @ 4800
60ft....... 1.996------1.867
1/8........ 8.739------8.701
mph........ 80.74------78.50
1/4........ 13.630-----13.689
mph....... 100.62------98.98

 

hmmm...so what exactly is the new times NA then with the HSR? Maybe I read the last post wrong but I didnt notice anything. By the way, for an update I just bought a HSR for the engine. Im very happy about it.

 

the last numbers are NA