If anyone hasnt seen it yet they ran thier IROC with the Stealth Ram a best of 12.36@109.93 with the TPI/SLP intake tune! Put down 330rwhp@5850 and 396rwtq@2850 with thier small 218/229 comp hydo flat taplet cam! They said that more power could have been had with a better tune. Also this was on a MAF car for anyone who cares.

 

Haven't seen the issue yet, but those are really good numbers. I just swapped to a HSR and 230/236 cam, and those times are giving me some hope at running 11s. Not that it matters anymore, but that's what they should've done with Magnum TPI.

 

Yeah, I read that. Very encouraging for me because I am installing a larger cam, porting my heads and adding the HSR this summer. I also like the fact that those times are run with minimal tuning done after the swap. I can only imagine what the proper tune can deliver.

 

guys remember, that run was with a lotof other mods besides the HSR. its a 355 with 9.8:1 compression, TFS heads and a custom grind cam. this engine went low 13's to high 12's with a tpi setup on so the 12.3 time was NOT acheived by just adding the HSR to a stock 350. and yes it does give us guys with HSR's.

 

True BOTTLEDZr28, but they dropped .3 tenths and gain 3 mph on the TPI tune. I wouldnt be suprised to see them hit 11s or really close to 11s with a HSR tune. Also they used a non hydro roller cam in their motor, which would mean there is room for even more gains.

 

Oh, yeah I know that. I just think that they recieved good results from an intake swap. I mean before i got into fuel injection, I did many a intake swap on old carbed cars and saw a little less or about the same in performance gains. To me, I find it encouraging that they did so well without major retuning for the specifc intake.

BTW, how is yours doing. I read that you got it all together. How's she runnin'?

 

Is it just me or does every really fast EFI/TPI car seem to have TFS heads? I've had a hard-on for AFRs but I'm seriously considering a Stealth Ram/TFS combo or a Stealth Ram/Holley head combo.

What I really think is great is that the car in GMHTP is running a flat tappet cam, not a roller cam. Since I don't have a roller block, it's nice to see those kinds of times with such a mild hydraulic cam.

 

I like the AFRs, but TFS heads are really good to. Also probably a lot cheaper than my AFRs. I don't have any experience with Holley heads.

 

So one on this board is running AFRs with a HSR and put down 380rwhp and 430rwtq with a 224/224 110 mag cam, auto, tuned by Fastchips and Ed told him that there was still room for more. I'm sure he'll be close if not in the 11s with the right suspension and tires.

 

wasn't that on a 383?

 

The Magnum terd hit an 11.99 , oh boy!

It took a 396ci stroker with ALL the goodies ($8,000 worth) to make a lousy 337 rwhp!! I totally lost interest in that car. The HSR IROC project will out run it with way less parts/money wrapped up in it. I would like to race the Magnum car to smoke it's *** and post the video! No offense Johnny, but we all had high hopes for that car and to only make what it did was disapointing to me at least.

 

Got any times yet?

 

Jim, it's always the Twisted Wedge heads that seem to run the good numbers. I've yet to see a set of those 23* heads post any good numbers but i'm sure they're out there.

 

Not yet, but I put 6 - 7 links on a Z06 during a red light race (0 - 130) and thats with stock suspension, dinky 3:23's (not a good combo when you have a six-speed, it's way under-geared), street tires, and I still have alot more tuning to go in the PROM. With slicks, my moser 12 bolt w/ 3.73's, ET streets, and a slew of Hotchkis/SPohn suspension goodies, I'm shooting for 11.50's

 

Yep, hopfully I'll get it done!

 

Hey Matlock, have you had that car to the track at all yet? Also 1BadZ28, do you know what kind of #s your putting down with that combo? My friend is building something similar, with the vortec heads and intake, but with an auto. He wants to run the xe282 with that, but I'm trying to talk him into using the xe276. He thinks the 282 will work since he is going to simese port his base a little to help out the airflow. I'm still telling him that the 276 will make him more useable power. Any thoughts?

 

No dyno #'s yet. Eventhough the car is running pretty damn good, I'm waiting on money for a new harmonic balancer (ATI or Fluidamper) and a new driveshaft. Once I get those, I'll make a few pulls and post the results. From the way the car feels and judging the results of the cars I've raced, the numbers should be decent.

I would tell your friend to go with a hydraulic roller cam and even fully ported vortec heads like mine dont need a cam bigger than 230 duration @ .050 to make decent power. Here are my cam specs:

with 1.5 rockers

Comp Cams X-treme Energy Hydraulic roller (XR276HR-12)
.503/.510 lift
224/230 duration @ .050
112 LSA
108 ICA

 

excuse the stupidity- but what magazine is GMHTP? I know CHP is chevy-high performance- but whats GMHTP

 

GM High Tech Performance...

 

Yea, he was going to go with the E-tec 200s from Edlebrock.

Did they sell, or atleast trying, the Magnium TPI car? I thought I saw that in the for sale section on cz28.com. Anyway, put a HSR on that car and I bet you get really close to the 10s.

 

Actually the ported super-ram on that car isn't going to be that far off on power than what the HSR would make. The ported super-ram would make a little more torque but a little less hp than the HSR, so something else is wrong with the Magnum's combo. But yes, the HSR would be a good swap for that car because that 396 makes gobbs of torque and could easily spare some for a decent increase in upper rpm range horse power. However it would take ALOT more than a HSR to make that car go tens (like a 200 shot or a blower)!

I dont think my car will make more rwtq, but I know it makes more rwhp!

 

Thats right, I forgot it is running the Super Ram. I wouldnt be surpriesed if it would drop a half a sec if someone put a HSR on it though. That and a little more gear, say 3.73, and it would be pretty close to the magic 10 sec mark.

 

The HSR may give it a tenth or two but thats about it. Keep in mind that it's gonna kill a chunk of off the line torque adding time to the 60 footer.

 

Has anyone swapped a Super-ram for a Stealth-ram on a built to the hilt motor? Any numbers from that swap?

 

I did it, but didn't get any numbers. Initial impressions from the SR to the HSR with a 219 cam--there was a slight loss of low end torque, but top end pull above 6000 was slightly harder. Mid range didn't feel any faster. I didn't expect a dramatic change, at least not with a 219 cam and mismatched prom.

Well about 2 weeks later I swapped in a bigger cam (230/236 Comp XE), but I don't have new numbers yet. IMO the HSR likes bigger cams as it runs much harder now. The prom I'm using now is setup for my old ZZ3 cam combo, so there is definitely more tuning involved. My car is getting painted right now but I'll have track times with the HSR and new cam soon.

 

on a maf car did they have to adust the computer or did it recalibrate itself?

 

The stealram is awesome and I'm not surprised by the numbers, because the combination is set up great, optimally speaking. (355ci, cam, heads, intake, etc.)

Now about the magnum car. You guys seem to be forgetting that the Magnum car is a completly emissions-legal car and is running a pu#*y a$$ cam, wimpy shorty headers, and cats when you trash talk it. Yeah I'm not too happy about some of the parts they chose, but it did hit 11's. Its also still PUTTING 440+lbs of tq to the wheels and over 400rwtp from like 2-4500rpms, which would at least make it fun to drive when you can practically smoke about any car 0-100. The main problem with the magnum car is the cam with like 226 intake dur. at .050 lift. They also used a dual pattern cam, which superrams don't seem to like very much. They should've used a 236/236 grind for a 396. It seems all everybody wants to talk about when judging perf. is max rwhp instead of looking at the whole torque curve. I know I'm repeating the same old cliche "torque is king on the street", but really thats why it's a cliche, isn't it?

And to whoever said the comments about putting the stealram on and gaining a 1/2 sec over the superram, I don't think so. Even with a lower gear ratio, I've noticed big inch torque motor's acutally lose e.t. when switching much past 3.45's. Believe me, the superram can make power from what I've seen in person and from what's on the boards. There are some certain vettes who are running ported Superrams on 406's, putting out 400rwhp+, which also are trapping at 123mph in the 1/4, which = 120mph in a 3rd gen. Check out the DIY board and you'll see.

Although the superram really shines when ported, the stealthram, may be the better choice today for an intake, because stock it flows like mad and it looks like it' s easier to work on.

 

I forgot that car was to be emissions legal. But that motor would have a lot to gain from the HSR. On a 350 the swap probably wouldnt be that noticable, but that 396 is requiring a lot more air then a 350 and would have a lot to gain, even with that small cam, with an intake that can flow what it demands. The larger the motor, the more air it needs. The motor may lose some tq, but would gain a lot above 4000 from the increase in breathing capablility from the HSR. Take a look at the LS1 guys, they are having trouble reaching 500rwhp and 500rwtq with hydro rollers even with motors larger then 400ci. Right now there are guys getting 470rwhp and 420rwtq on a 346, but dont even get 500/500 with larger motors, bigger cams and heads. Why, bcuz even though the LS6 intake is a improvment over the LS1 intake, it doesnt even allow ported LS6 heads to flow to their full potential. This is why some people switch to the Holley intake, even though you will have more heat soak for the intake over the LS6, you will still gain power. Even though tq moves the car, it doesnt do you any good drag racing when all that tq is below where you rev when racing. Like I said, I wouldnt be suprised to see it drop a .5 sec with the HSR over the SR intake.

You said that guys in vettes are running 123mph and F-bodies 120mph in the 1/4. I'm not suprised that are good #s even with 400+rwhp, but they would have a lot to gain from the MR or the HSR just from the added airflow those 2 intakes offer for those big engines.

 

THe point I was trying to make is there are WAY smaller combo's that only cost a fraction of what the magnum costs that make more power than the magnum motor. There are people like me who have already done that with cheaper components and using the STOCK GM ECM, not some $2,000.00 + DFI setup. For what is in the magnum car, the numbers "should" have been ALOT better. I still think that the magnum car has ALOT more potential in it and that something in that motor / computer is wrong causing lower than expected performance. That combo should have put 400 hp to the ground. AND, I dont think that the HSR would make that big of a difference on that car. I think it would kill his 60 footer a little. But hey, that's just my opinion!

 

Through a MAF?! What about all those "experts" who profess that a MAF is restrictive and there's no way to make power with one????