Me and my friend Joe (SLP IROC-Z on the boards) have been trying to think of which would be better. Lots of people say a Superram is too much for a 305, but good for a modded 350. Well since I'm sorta in the middle, I'd like to hear you guys opinions & experiences. The long stroke of my motor adds a large draw on the intake tract, which leads me to believe the Superram would be better because of the shorter runners/large plenum combo. If I were to go LTR, it would be ported plenum with Siamesed SLP runners and a ported or siamesed base.

I'd like to add horsepower mostly from 4000-5200, but keep the torque the same if not increase it. I'd like to keep the low end torque because this is mainly a street car and I do not plan on revving it over 5200 or so. The low end torque is also why I love this car so much, its a blast to drive.

Now in the Accel catalog I have, they recommend the Superram for engines over 377ci. I'm going to hafta disagree, since I notice alot of people have good luck with them on their 350's. Anyways I dynoed my car in July. This is with stock plenum (not ported), runners, base, cyl heads (3 angle valvejob), PROM and fuel regulator. The cam is a Comp Hyd Roller 210/220 at .050, 480/480 lift and 112 LSA.

Here are a couple of my runs in 2nd gear to give you guys an idea.


As you can see, the power is very broad...but only peaks from 4200-4600rpm. The cam is rated for 1200-5200rpm and I'd like to make more use of it. The tranny will have a 2600 stall if that helps any. I also have 2.73 gears and do not plan on changing them soon.

All questions & comments welcome. Sorry for the long post.

 

i like the design of the super ram on a 305 or a 305 with a longer stroke mainly because the 305s combination of bore and stroke cause it take deep breaths on the intake stroke. the engine wants to breath like a larger CI engine but it cant because of the bore. the reason why the super ram inspires me is because of the rather large plenum area. i think this is what a 305 needs because of the "deep breaths" it takes. the size of the super rams plenum has a lot more volume then the stock LTR TPIs does, so basically thers more air available on intake for the engine to breath. i feel the runner size of the stock LTR setup is pretty sufficent, but the length is to long. i guess the only way to really figure out what suits the 305 or 335 better is to probably do a back to back dyno test of each. im at the point now where id be willing to buy a SR just to compare it to the LTR TPI.

Im in the same boat as chris (tunedport335) i love the tremendous low end power but im interested in making more hp up top.

 

My opinion is that the superram will work well on a properly built 305 or 335. I have a 350 Corvette that had the ZZ-9 cam, Trick flow heads, high flow base, large tube runners, headers, and 52MM throttle body. This combination netted me 272 RWHP and 358 RWTQ with an auto transmission. I then switched to the Superram with no other changes and was rewarded with 309 RWHP and 376 RWTQ. This proved to me that my combination wanted more air flow. I also have a modified 305 (check my sig) with the large tube runner parts that were removed from my corvette. This modified 305 makes almost as much HP as the 355 Corvette when it had similar parts, I believe it would benifit with the addition of the Superram.

If have your 335 built with the correct intake and exhaust parts that allow it to breath then the Supperram will help you.

 

would u be able to post pics of ur dyno sheets in this thread? id just like to see where u gaind the power. was the power increased everywhere or just at peak?

 

I agree.

Thats pretty impressive! Those are the gains that I'd be looking for.

 

if you goto lingenfelter.com they say not to use the super ram on a 305 , they say 350 or larger

 

I don't have a 305, or a 350.

Thats why I'm thinking Superram. The long stroke of my motor adds such a large draw on the intake, I think it would work good. I'd still like to hear some more opinions!

 

If I read your first post right, the only mod to your stock 305 heads is a 3-angle valve job. Is this true?
If so then I think you need to address the limitations of your heads first. After that you will know for sure the answer to your question about upgrading intakes.

IMO the cost and PITA of running a superram isn't even close to justified when the cheaper options of the HSR or a carburetor are out there with higher potential power gains.

You can try your alternate plan of siamesed runners and major porting on your intake & plenum for much less money & then judge your power gains, but like I said first, take care of the heads first IMO.

 

I cannot attach pictures but I will list the highlites of the differences between my 355 with the large tube runners and the supperram addition with no other changes.

On a stock 305 the superram would not be a good idea but on a modified 305 it makes good sense to me.

355 with large tube runners

TQ peak was 355 RWTQ at 3400 RPM
HP peak was 272 RWHP at 5000 RPM

355 with only change the addition of the superram
TQ Peak 375 RWTQ at 3700 RPM
HP peak 310 RWHP at 4700 RPM

What was surprising to me was the lower HP peak of the superram when compared to the large tube runner setup with all other parts being the same. For whatever reason the Superram peaked lower with my combination of parts.

 

Not really, his sig says he has a 335, bored and stroked 305.

 

Read his quote again though, he is right...the only mods done to my heads are a 3 angle valvejob and shaved .010, and of course COMP springs etc etc. But the ports & bowls are all stock.

He is correct that heads are limiting my motor alot, but I think the stock TPI would hold it back alot more than the LB9 heads though.

bjankuski- Thanks for the dyno numbers! a 38rwhp gain is pretty damn impressive. Thanks for the posts guys, it give me some ideas to run through my head before I make a final decision.

 

stroker motor will pull a lot more air down and anything for a modded 305 or 350 is a good step up from the TPI. If you had a base 305, then i would advise you not to do it.

TunedPort335, I might take a little road trip while im up here in college and come see your car one day! Ill PM yea when the time is right! Id love to see your car!. If you need any help, im up here in Mass now for the school year, and ill stop by for the weekend if you need help with whatever.

 

SuperRam. It will most likely produce the flattest, nicest torque curve out of any TPI system other than a MiniRam. I wouldn't worry about the cubes that they "say SuperRam is for." I think thats all about the throttle body that's on there.

 

my 305 will have ported LB9 heads and a really nice cam, thats when i was considering swapping to the SR, but even with really nice port work and a cam, willie and tim burgess say to use the TPIS super profile L98 cam in my car would the sr still be to much? if so i think i will go with 3" siamesed SLP runners ported base etc.

 

i like posts like these cuz they help me in my decision for what i wanna get when i get my motor built next spring.

 

honestly i think the only way to figure this out is to strap both cars on the dyno. do a few runs on teh TPI units, swap to the accel plenum and runners, do a few runs on that and see what happens.