C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Superram installation finished

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Old Apr 17, 2006 | 09:34 AM
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Default Superram installation finished

I've just recently finished with my Superram installation so I thought I'd
share my experience and observations so far with you.

First of all here is my engine configuration with all mods listed:
- stock shortblock ( '90 350 L98 )
- LPE 74219 cam
- ported #113 heads ( ported by myself )
- LPE valve springs and Ti retainers
- 1.6 CompCams ProMagnum RR's
- CompCams hardened pushrods and guideplates
- complete LPE/Accell Superram ( unported )
- #24 Ford injectors
- Hooker 2151 longtubes
- free flow ( no cats ) true dual exhaust
- PCMforless chip ( still under construction )

I did my research before I started with superram install so I can say
that I was prepared for PITA job. And guess what? It was actually less
complicated than I expected. Two or three studs that hold plenum to
runners are difficult to reach but I've cut a wrench, welded it back
together under angle that looked good to me and problem was solved.

Alvin form PCMforless sent me first version of chip. I decided to use
their "Load it yourself" option as I have EPROM programmer and
receving files by email is much quicker than waiting for actual chip to
come from USA to Croatia.
Engine started right up but when I went for a drive it felt like it had no
power and like I had fuel starvation. I discovered that throttle body
wasn't torqued enugh and there was false air leak. It turned out that
there was not enought thread in superram plenum to torque throttle
body with stock studs.
With this solved I went for a ride to get some Datamaster logs for Alvin.

Engine feels strong in all rpm ranges but most improvement is felt in
high rpms. It revs past 6000 rpm and still pulls at that rpm. There are
still some issues that have to be worked out, but since I curently have
second version of chip I hope that this will be solved by third or fourth
version.

But despite feeling numbers don't look much better than I had before
superram. I did some g-tech runs ( see pic under ) and I'm not too
satisfied. It looks that I only gained 1 tenth from my previous best.
I'm not sure how accurate g-tech is and my previous best was
measured on track and it was 12.977@106 with 2.0xx 60 ft time.

One thing that could have slowed me down is that now when shifting
at 6000 rpm or higher trans is shifting slower than ever.

This is all that I think of so far. I'll keep you posted when I get new
chip version and when I'll have some new numbers.

Let me know what you think of this results so far. I must say that I
expected to see low 12's but for now it looks like it's gonna be really
hard to achive this.

Here is g-tech results pic:

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Old Apr 17, 2006 | 09:58 AM
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Congrats on the install. I just installed my own SR also.

It is running but I'm having some tuning issues, went through 5 chips yesterday, so it should be pretty close now. Mostly idle and ignition timing issues. The sr doesn't seem to want to idle below 850 with my cam Comp 503. My old intake setup (slp/stock base) would idle down to 700 rpm, maybe more exhaust reversion with the SR?

For me plenum installation was a breeze, I studded the plenum and used kep nuts from below. The studded plenum slips right on to the runners, it is easy to spin the kep nuts on from below and I can tighten them all with an open end 7/16" wrench with no problems. No drama whatsoever.

I might have a coolant leak that I need to work out though...
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Old Apr 17, 2006 | 10:15 AM
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im curious to see if anyone had more luck with power gains from the Super Ram
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Old Apr 17, 2006 | 10:26 AM
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Can I assume that you have an automatic, Bruno? Is the kickdown cable adjusted properly? I'm betting there's still a lot there that you'll get out of it. I'd love to see pics when you have the time.
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Old Apr 17, 2006 | 12:24 PM
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With the 219 cam and SR, it's worlds apart from the stock setup. You're either leaving something on the table (tune wise), or the trans is not shifting properly like others have noted. Also, the G-Tech I think would be best for apples-to-apples (meaning the same device compared against itself) vs the G-tech vs a 1/4 mile run.

My only complaint with the SR is the tendency to strip out bolt holes due to the thin aluminum; and the fact that the plennum-to-runner bolts should go in from inside the plenum and be drilled for small cotter pins out of the box (I am considering this mod while the intake is apart).

It's a hoot though, really the best intake for an automatic with it's excellent torque curve. And YES, the 219 idles higher around the 850/900 range depending on the tune and other variables. The TPI style intakes had longer tracts that helps torque and smoother idle (as well as accepting less cam).

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Old Apr 17, 2006 | 12:39 PM
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Few things I am thinking :

First of all you should throw the Gtech OUT the window and go to a track. The ET #'s on the street are inaccurate as hell. I just realized youa re in Croatia, so not sure what your options are there.

On the track with a perfect launch, the Gtech is fairly accurate, but on the street, it is always off by a tonn.

With a good tune, the car should be an easy mid 12 sec car, IF you have agood set of gears on it.. If you don't have the 3.07 performance rear axle, or better (3.45 gears), you'll be high 12's if not worse.

But seriously, don't go by the Gtech. It's more of a gimmick that looks cool than anything. I've had the old gtechs and the new competition models.. Both sets inaccurate on the street, as they don't forgive wheelspin and measure MPH too high as actual MPH, not like a real track does. Bets thing to do is race some people and see what she does.
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Old Apr 17, 2006 | 12:42 PM
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Originally Posted by Corvette Kid NC
Can I assume that you have an automatic, Bruno? Is the kickdown cable adjusted properly? I'm betting there's still a lot there that you'll get out of it. I'd love to see pics when you have the time.
Yes, it's an automatic. I have adjusted TV cable according to
instructions ( TV plunger fully extended at WOT ) but if I leave it in
Drive it still shifts way too early, so I'm shifting manually. And I can
tell you, as higher in rpm band you shift, longer it takes to shift gear.
I'm planing to install full manual valve body from Pro-built automatics
with all new HD clutches and Trans-Go shift kit but it will have to wait
until I recover financially. My tranny blew last year and I had it rebuilt
here in Croatia, but I never really liked how it worked after rebuild.
Also I was never able to shift 3-4 at WOT, and just few hundred miles
after rebuild I lost ability to drive WOT in 4th. If I hit WOT in 4th it will
downshift to 3rd at any speed. ( That was how it blew first time, it
downshifted to 3rd at 155 mph )

Also while accelerating from stop there is a blind spot somewhere
between 1800 and 2800 rpm and I hope that Alvin will be able to solve this.

As for idling, I'm also having troubles keeping idle below 1000 rpm but it
has nothing to do with cam becuse engine idled at 700 with no problem
before superram.
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Old Apr 17, 2006 | 01:06 PM
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Just installed mine too. I had the valve cover clearance issue. and I did the injector/fuel rail insatllation a few times before I got the wiring the way I wanted it.
It starts and idles fine using the previous tune for the ported factory intake. No road test yet.
Overall it was definatley the most PIA intake I have had the pleasure of installing.
The Setup:
-.020 over 4 bolt roller block
-Al 128 heads (lightly reworked)
-ZZ4 cam
-1.6 Harland Sharp RRs
-Upper Accell Superram ( unported )
-Elelbrock base ( ported to superram and 1205s)
-Holley 52mm Throttle body
-#24 Ford injectors
-Air pump eliminator
-Hooker 2151 longtubes
-Flowmaster exhaust
-My own tune ( always changing)
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Old Apr 17, 2006 | 05:00 PM
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Originally Posted by MrNuke
With a good tune, the car should be an easy mid 12 sec car, IF you have agood set of gears on it.. If you don't have the 3.07 performance rear axle, or better (3.45 gears), you'll be high 12's if not worse.
I have 3.07 rear gears. Low to mid 12's was my expectation.
I'll see how it will perform with new version of chip, and maybe I'll try
to get wideband O2 to get some better datalogs for Alvin.

I'll also try to get car dynoed at same dyno where I had it before superram.
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Old Apr 17, 2006 | 05:19 PM
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I will have to keep track of this thread an post my results soon. I have a new 383, same cam, ported 113 heads, Super Ram, Stainless Works 1 5/8 headers being installed back into my 91 with auto and 3.07. Ski_dwn_it is working on my chip. I can't wait to crank this baby up.

It has about 15 hours on it being backdriven on a rig at the engine shop to get the rings seated and the other rotating parts and their bearings a little more familiar with each other before we light the fire in this puppy.
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Old Apr 17, 2006 | 05:39 PM
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Its good to see all these SRs being installed at the same time.

Hopefully we can learn something from each other's experiences. My car is idling better now after re-setting the base advance to 6 degrees, along with some chip work increasing the idle rpm to 800 and adding some spark in the spark vs load vs rpm table, nothing serious.

I also leaned out the open loop a bit since my eyes were burning and my hair still smells like fuel rich exhaust-gotta love it. I Took it for the first drive to get gas. Feels strong with no real issues, But I have't been above 3500 rpm yet, taken it easy on the new lifters, etc.

Here's a photo I just snapped:

Last edited by tequilaboy; Apr 17, 2006 at 06:04 PM.
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Old Apr 17, 2006 | 07:35 PM
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Mine is going on this week and hoping to post no posts about installation
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Old Apr 17, 2006 | 08:58 PM
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mine too, is going in this week. Super rams R US.
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Old Apr 18, 2006 | 02:22 AM
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It would be really great to see all your results. Post them as soon as
you get any.
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Old Apr 18, 2006 | 07:17 AM
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How are the roads in Croatia, problems with the ground clearance when driving a C4?
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Old Apr 20, 2006 | 04:50 AM
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Originally Posted by Corvette Kid NC
Can I assume that you have an automatic, Bruno? Is the kickdown cable adjusted properly? I'm betting there's still a lot there that you'll get out of it. I'd love to see pics when you have the time.
Here is before ( waaay before )/after pic:





I took some pics of stock and superram intake before installation and I have
measured port sizes so I'll post those later.
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Old Apr 20, 2006 | 04:52 AM
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Originally Posted by Mr X
How are the roads in Croatia, problems with the ground clearance when driving a C4?
Not yet, but I'm planning to lower her.
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Old Apr 20, 2006 | 05:57 AM
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I installed a Cam and SuperRam over the winter on my track car. The installation wasn't as bad as I expected. I ran some dyno pulls and gained around 33 HP at the wheels. Doesn't sound like much but the HP curve is relatively flat for about 600 RPM. At 5000 RPM I have 50 more HP than before. I didn't get any increase in torque but got the same flat cure for around 600RPM. I gave ski_dn_it my cam and engine specs and the engine runs great. Had it on the track yesterday and runs great. No longer begins to run out of steam in the mid 4000 RPM range. Thanks again ski_dn_it. Oh it's a basic ZZ4 crate motor , no head work.
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Old Apr 20, 2006 | 06:04 AM
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Sorry I assumed everybody would know who ski_dn_it is. He is one of the sponsors of the forum and burns custom chips.
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Old Apr 20, 2006 | 08:22 AM
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Originally Posted by Sliding
Here is before ( waaay before )/after pic:





I took some pics of stock and superram intake before installation and I have
measured port sizes so I'll post those later.
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