I found out that WOT was lean at 14.5:1 just about the entire RPM range. Using the PE vs RPM table (I run the 7730) I added fuel. The second set of runs I had a 12.5:1 and that is where I left it. Both runs (lean and rich) yielded the same horsepower rating but torque increased by about 15 lbft. I also played with timing a little. I started with 30 degrees total advance and settled in at 33 degrees total. At 34 total, I picked up a slight knock at about 4500 RPM.

My horsepower is still lower than expected at 334HP to the wheels at a peak of only 4800 RPM. Torque however was substantially higher over the Minram at 430lbft at 3500 RPM. Torque was over 400 to the wheels from 3000 to 4500. My run with the Miniram earlier in the year yielded 327HP and 377lbft of torque. So I guess that explains why I like the Super Ram for the street.

Thanks for reading,
Jason

 

Thats really interesting. A fellow on another board picked up 30lbft across the board and 20hp by jetting up from 14.7:1 to 12.5:1. This was a 350sbc with a carb though.

 

If anyone is interested, I can email them the small (62kb) Diacom DGF file of the run. What is interesting is that my injector pulse width goes up till peak torque and then it goes down just like my VE curve does. I guess I assumed that the pulse width increaes as RPM's go up. Just one of those things I never thought of. Also O2 volts steadily increase from about 845 to 920mv when the WB shows 12.5:1. More proof that the stock O2 is just about worthless at WOT.

Jason

 

Yep, the injector pulse width usually matches the torque curve, which is usually similar to the LV8 curve too. Airflow is more related to horsepower, and my peak airflow readings are within a few hundred rpm of my horsepower peaks. That's quite a torque monster you have there Jason!

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Greg Westphal
'87 IROC 355TPI/A4

 

Greg, yes it is quite the torque moster but there is a fellow that is on the Corvette Forum and here as Bowtye8 that dynoed 368HP and 430TQ with a 383, Super Ram, smaller heads than mine, smaller cam and was still using the MAF on an 85 Corvette. So he had 34 more horses to the wheels. Both 6 speed cars. Funny thing is that the Miniram and Super ram are making the same amount of horsepower. Maybe its some sort of airflow restriction.

Jason

Jason

[This message has been edited by 89vette (edited November 01, 2001).]

 

Interesting! I was getting about 5500 rpms peak with my SR and that was with 1-5/8" shorty headers and very rich (10.0:1) mixture. My dyno #'s before the swap to Long tubes and 3.5" mufflex was 331rwhp and 388rwtq. I hope to see a good bit more after the swap and major tuning. I too love the power of the SR. It just feels so strong at any rpm. Thanks for posting your results!

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David Tuschhoff
1991 RS/Z28 Camaro
FI 355ci NA SBC V8 M5.
12.47 @ 110.7mph 1.80 60'
Best mph of 111.6.
My f-body page!

[This message has been edited by David 91RS/Z28 (edited November 01, 2001).]

 

Yea my power graph peaks at 4800 and then stays fairly flat to 6000. That is what makes me think its an airflow problem. I called Comp Cams and told them what cam I have and what I was expecting which is at LEAST 50 more HP to the wheels. They told me the cam I am running now is their Magnum series cam and I would be better of with their exteme energy series grind cam. They suggested a 230/236 duration .544/.555 lift on a 112 LSA. They told me the ramps are much more aggressive on the Extreme series cams. Who knows. I'm probably better off with what I have which is a solid 400HP motor with incredible torque all in a "street friendly" RPM range. That's what its all about anyway right?
Jason