Okay,

Although i had my heart set on the MR because it is definitely faster, I ended up with a SR. Now I am thinking how to make it compete with a MR.

1. Can the Plenum\Runners\Manifold be ported?
2. How about siamesing them?
3. Will a HOTCAM help it rev a little higher, if not is the 219 the best cam to put in?
4. Will a bigger TB (58) help in SR, or just run the stock one?
5. Who can e-mail detailed instructions with all the pitfalls, and tips to help install the SR?

Thanks guys!

 

Do NOT try to siamese the runners. I did and it killed it. I ported mine and the 350 seemed to like it. More cubes would probably like it even more. I'm assuming you have heads that can take advantage of the addtional flow. Probably not worth porting for stock heads. the 219 cam is hard to beat with the SR. The 219/Sr combo works well over a wide range of applications from 350's to 420's, although the SR will start to choke larger cubed engines. The miniram may have more potential, but dont sell the SR short. It makes a nice street/strip combo that can take you well into the 11s and you dont have to rev much past 5500 to do it. . Good luck.

 

Did you completely not read the thread we had describing the MR and SR? :confused:

Listen to ralph, he knows his poopie.

p.s.

Did you see my dyno thread? That "not as fast" SR made 322hp and 362 ft/lb at the wheels without tuning it! It made over 300 rwhp all the way from from 4200-6200 RPM.


[Modified by scorp508, 9:49 AM 8/5/2002]

 

I really did not port mine. I used a Standard Abrasives porting kit and cleaned up the ports a little and smoothed the area where the runners meet the plenum. Then I had the whole thing extrude honed which I think was a waste of money. I have a 396 and I think the intake and heads on my set up are choking my motor. I have the torque that a 396 should have but I have the HP of a 350 because I peak out at 4700 RPM and then it flattens out. Scorp has a nice combo of 321HP to the wheels so it looks like he did something right. I only register 334HP peak at the rear wheels. Scorp made his peak power at 5150. My power at 5150 was 325 and stays above 300 till 5700. That's why I think the SR and heads need more work. So to answer your question, on a 350, I think mild porting will help.

 

I definitely think that you would benefit from porting yours out some. I assume you have a 58mm TB on yours? I'm still running a 48 and trying to decide if I should go up or not.

 

Yes I have a 58mm on mine. I can't say one way or another weather or not you would benefit. Only one way to find out, stick one on and see!

JN

 

Anyone have pics of their ported SR? I'm just want to see how much material you took off and where.

 

Well you will also notice that Scorps dyno curve is very peaky. Not what you are exactly looking for in a street car, or a part time drag car either. But thats the type of power band the Mini- ram would have given as well. LIke the LT1 they are a very peaky intake. With a SR on a large cube motor(383, 396, 400) it makes a very flat HP and TQ curve. You will have a higher average HP across the board. Thats why SR cars perform so well at the drag strip.

But as for the originial question, all you really need to do is match the flow of your intake to the flow of your heads and you will be fine. If you are running sock heads, do not port the intake. If you have AFR 190's out of the box, you probably won't see much from porting it either. Now if you have a set of ported AFR 190's that flow up to 270 cfm on the intake side, you will see nice gains from a ported SR. It's all about matching your setup.

 

:confused: The poor girl is outta tune too, not fair to compare yet. Is that HP curve really considered peaky even though there is less than 21hp difference over 2000 RPM? I'm sure the torque curve will look MUCH nicer once the A/F and timing issues are straightened out.

 

Scorp the torque curve of a tuned port will always be peaky. You will get a pronounced torque peak where the intake resonates (tunes). An LT1 will have a lower but flatter torque curve, all things equal.

 

Not trying to take anything away from you Scorp. But I have had friends with the same combo, that was actually tuned and theirs was the same way. You had to rev it to 3k to get it up the driveway. But let it hit 3500 and it got ugly, just like yours.

When I had the 383, my numbers were alot broader so to speak.....at 2800 I was already over 200 RWHP and 350 RWTQ and at 3800 300 RWHP and 405 RWTQ at 4800 355 RWHP and 380 RWTQ. HP eventually peaked at 5200 or so.

Just saying with your car its like flipping a switch, not much down low, too all sorts up high. And it seems from previous replies from other members with similar combos this is rather common.(i.e. not being able to burn out down low without dumping the clutch and so on). But that exactly what happens with alot of flow and not alot of cubes. Not alot you can do at this point. The extra tuning will make drivability a bit better and make it run more efficiently, but not going to give out the instant bottom end you are looking for.

 

quote:
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Not trying to take anything away from you Scorp. But I have had friends with the same combo, that was actually tuned and theirs was the same way. You had to rev it to 3k to get it up the driveway. But let it hit 3500 and it got ugly, just like yours
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I think Scorp will find more grunt down low. I only have a 2200 stall and spin the BFG Drag Radials at 20 psi with EASE on my AFR 190/LPE219/SR 355. I have NO tuning yet either, just set inital timing at 8 degrees and an ARAP PROM with a 750 rpm idle.

 

Anyone gonna share installation instructions??????

 

https://www.corvetteforum.com/review...157&TopicID=13
Read my review from a few years ago. Also if your installing the base at the same time, do a mock install in your work bench. Some of the runner bolts need to have the heads ground and I had to shorten some of mine.

Jason

 

Slot the screws that go through the runners into the plenum, then run a die over them.

Run a thread tap through all threaded holes on the SR.

When you install the runners, leave them loose enough to move back and forth, then install the plenum bolts through the runners. This will allow you to get them in. once you have all runner to plenum bolts in (not tight) tighten down the runners to the base. then tighten down the plenum.

On one of my base bolts holes, , water passes through it. I put sealent in that bolt hole to seal it up. I cant remember which one it was though.

You might want to have the inner runner to plenum bolts that are between the runners on each side modded. Some guys drill out the plenum threads, and intall bolts that thread in to the runners the opposite way (down through the plenum, into the runner) of the perimiter bolts. this will make things a lot easier. You cant really get your hands in there with the injectors in place.

If you have big hands you might want to try and connect the injector harness before you put the plenum on.

I would put it together off the car so you can get an idea of where the problem areas are.

Thats about all I can think of for now.

 

I dyno'd my 383 right after Scorp Saturday. I heavily ported my SuperRam base / runners / plenum.

Dangerously lean. Peaks of 388 rwtq, 350 rwhp. RWHP happened at 5500, where I let out. It hadn't dropped off yet. Average tq between 2500 and 5500 - 364 rwtq. This was on the first and only pull. I think I can get peak HP to happen at 5800 with more fuel.

I can pull from 1500 in 4th gear without bucking, snorting, or farting. Just ask Scorp. It's all in the tune.

There is a ton of material to take out of the runners. There is material to take out of the base, in the roof and the floor, then the plenum gets matched to the runners, and the runners get matched to the base. Think tapering from very large at the plenum, to the size of the ports at the heads. The intake charge will pick up velocity as the runner tapers down.

 

I wonder what the difference why I make peak HP at such a lower RPM? I thought it was my cubes. Maybe there is more magic in the 219 cam than we realize. I wonder what is different to give me more torque and less HP than you.

 

does your cam have an advance ground into it or was it installed advanced. Is the LSA gt or lt 112, that will also make a difference in peaks. More cubes will make it peak a little lower too. A 5300 peak for HP is about right for a 219/Sr setup

 

The tire spinning is due to the fact you have an auto with a loose convertor. Torque multiplication is a wonderful thing. If you had a stick and were idling along in first gear and you floored it I highly doubt you would be up in smoke without a little clutch help.

 

Thanks for all the tips guys. I know I will think of more questions along the way.......

ahhh! What about the gaskets for the base, runners and plenum? Are they stock, does Accel still sell them, does anyone knowwhere I can get spares, and the part #'s?

Thanks!!!!!

One more thing....

Does anyone have a copy of the original instructions that come with it?

Thanks!