To the benefits of the super ram or miniram system still show with forced induction? I remember reading one time that the very large plenum volume of the super ram made harder to build boost. It also seems that with forced induction, flow is less of an item, and the stock TPI system could help maintain velocity. The Callaway corvettes were something like 500hp with their turbocharged TPI systems and they used a stock top end. What do you guys think?

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In general, forced induction of any kind (Turbo, SC, nitrous) overcomes the limitations of the intake tract, by pressurizing it. Of course, at the same time, it makes the exhaust side even more important... whatever goes in, must come out.

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"So many Mustangs, so little time..."
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ttt. Any more opinions? I'm hoping to develop a good conversation here, but so far it's a tad 1-sided.

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Jim..i've heard going with a MR or SR would actually decrease your boost pressure...kinda makes sense...more volume to fill...less velocity....thats why when i was thinking of doing a 355 ATI P1-SC i was only gonna do a modified TPI not a super or mini ram...but i'm going turbo 3.8 now

I'm sure you would see some gains over a stock TPI but just less boost..does that make sense?

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I would tend to agree on the less boost with more volume idea. You could try to overcome it by using a turbo that would push more volume at the same pressure as a smaller turbo, but the spool time would suffer. I have always wanted to do a twin turbo on a TPI. Get a bigger base, runners, good heads. Even using madmax's idea of cutting out the divider wall on everything would be better, as I see it, than a SR or MR. A lot cheaper too.



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Joshua Johnston
1991 Z-28


350, T-5, K&N, Ported Vortec heads, Edelbrock RPM, Holley 750 D.P., HEI, 11.07:1 CR, Comp Cams Roller-.510"/.520"-282*/288* dur., Shorty Headers, Dual 2.5 Exhaust,Dynomax Bullet Mufflers, T&R Motorsports custom air intake

 

Just rember, less boost due to a mod such as a mini ram does not mean less power. I put a set of slp runners on, ported my intake, and 1.6 rockers and went from a 13.3 to a 12.8. Boost is a measure of internal resistance and not a measure of rwhp. Take my case, i push 7lbs of boost now where as before my mods, i was pusing 8.5psi. I know that i have less boost but i am getting more air in the cylinder due to the larger intake mods, hence, more power. If I were you, look for a used tpi intake base and get some slp runners and do what mad max did.... cheaper than a super/mini ram and you can always go back to the stock setup if it doesn't work for you. And it will not break your wallet

 

I tend to think that using a small plenum setup like the factory TPI setup is best...I was gonna use a SR on my 350 but decided against it for the following reasons...it's expensive, it's difficult to install and work around, it's expensive and under boost, the SR has more plenum area it needs to fill. More potential for loss of boost pressure. Kind of a drag after you spend over $1000 for the SR and $3000 for a blower setup. While you can argue that a larger plenum has a larger storage area for boost pressure, I guess it comes down to how much pressure your blower puts out and how fast it can pressureize the manifold.

My solution? Simple. Think about this mentally. SLP runners, ported. $250. Ported plenum, free. 48mm TB with an airfoil and ported(siamesed?) stock base. The added pressure over comes flow restrictions in intake manifolds for the most part. In other words, the intake manifold plays less of a role on a booster engine.

I believe the Miniram and SR are better suited for N/A and nitrous-huffing motors. That's why the SLP runner setup I'm using now will be in a box in the future for a blower setup...I'll buy a SR to replece it.