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Want 450 to the wheels. How much boost?

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  • Want 450 to the wheels. How much boost?

    I wrent to the DFW Cruise this past weekend and had a great time! I know it was hot but my car just wasn't running how I think it shoud. I realized I had my base timing set to 5º after I got home so I was only running 26º total all night(Thought it was 31º). The car weighs 3390 without me in it, and at the cruise I had 2 tool boxes, floor jack, and a cooler in the trunk. I'm thinking 3650#'s or so. My best was a
    60'........2.24
    1/8th.....8.51
    Mph.......86.3

    I'm tired of the lopy camshaft and the RPM II intake. I'd like an emissions friendly camshaft, and to put the heavily ported factory 95 Cobra intake back on. Doing this would really put a hurtin on the times, and I'm already not totally happy. I'm thinking about adding the small cam, Cobra intake, and an S-trim. How much boost will it take to reach 450 to the tires reliably? I will have:
    10.1 331
    Vic Jr heads
    Comp Pro Mag RR's 1.6/1.7
    70mm tb
    Ported U/L Cobra intake
    42# injectors
    FMS shorties
    2.5" exhaust with cats

    I'm hoping I can get it done without the meth or an intercooler. I drive this 500 miles a week so simple is better. I'm hoping less than 10#'s would do the trick. Does that sound reasonable? I'd like to see 5-6#'s in reality and make 450 to the tires. I'm thinking 300-325 rwhp NA with the smaller cam and cobra intake.

  • #2
    Your plan sounds reasonable, but be careful with 10:1 compression and gasoline with no charge cooling (ie., intercooler, alcohol).

    E85 would probably help the charge cooling quite a bit, but it's doubtful that your 42 lb. injectors would be adequate.

    You may want to consider an intercooler.

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    • #3
      Your mph is enough for squeeking in some 7.xxs

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      • #4
        I'd work on suspension/tires first, get those 60's down to 1.5 and you will be much happier with your times
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        • #5
          I want the car to go 7.6's the way I drive it every day. No DR's, no slicks, no cooldown, no skinnies in front. Just the way I drive it on my regualr street tires. I think 450 to the tires would do that. I want it to run 11's on pump gas, idle smooth, have a cold AC, be nice and quiet.

          I do agree that I need some suspension work. As of now all I have is Tokico adjustable struts im front, Tokico rear shocks, and nothing more. I need subframe connectors, and control arms at the very least.

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          • #6
            stock lsjuan

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            • #7
              Teh part to remember, is that the engine probably makes quite a bit of N/A HP. Keeping that in mind, you'll have to spin the piss out of that S trim to keep that engine satisfied. Even for just 5 psi. I'd bet the pulley has to be 3 sizes smaller for that engine vs. a 302 for the same boost.

              I think that E85 will be mandatory, or at the very least Meth.

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              • #8
                Def can't do E85 because I drive it too much to be hunting down a station. I'm trying to get better mpg's. Right now I'm getting 10-12 in town and 24+ on the hwy. I want 15-16 in town. I think the cam is killing the mpg's in town and a stock(ish) custom grind like 212/212, 114 Lsa, and .575.590 lift would really help with that. I want the cam to be done by 5500 RPM. I think the ported stock Cobra intake will be well suited to that. I'm afraid a T-TRim would be too big. You don't think an S-Trim can make 6lbs at 5500 RPM without causing too much heat? I figured the smaller blower would be better than a larger one for this application. MAybe I'm ass backwards.

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                • #9
                  Why don't you want DR's? Just swap out when you get to the track if you don't want to ride on them daily...
                  Last edited by gip99gt; 05-30-2012, 12:52 PM.
                  04 GT
                  91 LX

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                  • #10
                    Originally posted by Diabolic View Post
                    Def can't do E85 because I drive it too much to be hunting down a station. I'm trying to get better mpg's. Right now I'm getting 10-12 in town and 24+ on the hwy. I want 15-16 in town. I think the cam is killing the mpg's in town and a stock(ish) custom grind like 212/212, 114 Lsa, and .575.590 lift would really help with that. I want the cam to be done by 5500 RPM. I think the ported stock Cobra intake will be well suited to that. I'm afraid a T-TRim would be too big. You don't think an S-Trim can make 6lbs at 5500 RPM without causing too much heat? I figured the smaller blower would be better than a larger one for this application. MAybe I'm ass backwards.
                    If you cam it down that far, it might do better. The smaller blower will work good with LOW boost numbers, but keeping in mind that the harder you spin it, the more heat it produces. The engine necessitates the overspeeding the blower though.

                    Efficiency.

                    I'm not saying it won't work, it just may not be optimal.

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                    • #11
                      I want what is most optimal for a hassle free 450 rwhp 331 daily driver combo. That's what I'm asking. I want a stock like idle, pass emissions, and make enough hp to hit some mid 7's in the 1/8th with 2.1-2.1 60' times. Thwe smaller cam is a must. I haven't gone smaller because of the VBic Jr heads and the ported RPM II intake, but I think the smaller cam, and Cobra intake will be fine with a supercharger. So what do you suggest? Something larger than an S-Trim?

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                      • #12
                        Originally posted by Diabolic View Post
                        I want what is most optimal for a hassle free 450 rwhp 331 daily driver combo. That's what I'm asking. I want a stock like idle, pass emissions, and make enough hp to hit some mid 7's in the 1/8th with 2.1-2.1 60' times. Thwe smaller cam is a must. I haven't gone smaller because of the VBic Jr heads and the ported RPM II intake, but I think the smaller cam, and Cobra intake will be fine with a supercharger. So what do you suggest? Something larger than an S-Trim?
                        That may be a question for Vortech, as I'm a bit out of my realm there. I'm just speaking from past experience though. We've made 550RWHP on 5 speed cars and 302-310 CID, but you're cubic inches may pose a problem as far as what it will support, purely from a flow perspective.

                        Again, it will likely make your power goals, I just don't know that you'd leave some more reliable power on the table by simply putting on one size bigger blower

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                        • #13
                          Wish I could dyno the car as it sits. My MPH numbers are low because I always had to lift after the 1-2 shift because the tires would start to spin. Track prep was pretty good though. I'm thinking if I didn't have to lift on the 1-2 so much that the mph would go up to 87 or 88. Maybe that's just wishful thinking. It was like 90º+ out there.

                          I'm gonna go back with the full 31º of timing and see how it responds. Since I have this new trans from The Source I don't have to flinch every time I shift.

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                          • #14
                            I don't think you will ever do it on plain old street tires, you'll be making too much power, the spinning problem will just get worse. You need some kind of tire on it. Hell it would run 7.6 right now if you had traction.

                            As for the S-trim and the relationship of boost versus displacement, A 7" crank pulley and a 3.05" blower pulley will do about what you want, as long as you have a big blower inlet, good size MAF meter and not the plastic inlet elbow sort of junk. 450 rwhp is still in the comfort zone of that blower, it will do it just fine.
                            Originally posted by racrguy
                            What's your beef with NPR, because their listeners are typically more informed than others?
                            Originally posted by racrguy
                            Voting is a constitutional right, overthrowing the government isn't.

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                            • #15
                              I was playing with the Wallace racing calculator. It says with a track elevation of 665', temp of 90º, that my car is making about 380hp. I'd really like to try a fox tb swap, and some 1-3/4 shorties before I switch completely to the SC route. I noticed 2 2011+ mustangs out there running 8.7-8.4. Neither sounded stock but maybe they were. I was right there with them , but most likely they are stock and that's just too close for comfort.

                              Anyone have a Fox cruise control cable I can buy?

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