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Discussion Starter · #1 ·
I am thinking about purchasing the S-trim Vortech supercharger for my Bullitt. However, I noticed that Vortech proclaims for street apps under 10 psi, putting on an aftercooler can actually create more parasitic loss within the supercharger than gain. I am not too keen on the battery relocation to the trunk, just my personal preference. Do you think I will regret not putting the aftercooler on later on? I am looking to get about 375-400hp at the rear wheels, so I thought some other mods would rectify that without adding the aftercooler. I plan on going with 3.73 gears, Pro 5.0 shifter, 19lb.< injectors possibly, different H-Pipe or Bassani, headers, and that's about it. I really don't want to do anything that I can't easily change back over to stock. And yes, I know about tapping the hole in my oil pan for the Vortech. Any suggestions and or comments would be appreciative. Thanks in advance.

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Bullitt #4915(Black)
Mods-Superchips(for the time being)
1970 Chevelle

<font size=-1>[ This Message was edited by: Nvr2Fast on 2002-01-24 20:35 ]</font>
 

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Don't waste your $ on an aftercooler. I didn't on mine through the advice of many. I put mine on before any other engine mods and when I put an x-pipe and Borla catback on after the Vortech I could tell a big difference. Do the exhaust for sure with the s/c. By the way the Vortech kit comes with injectors and they are way bigger than the 19 pounders you talked about. Here is a good article on inter/aftercoolers:

http://www.superchargersonline.com/techarticles_detail.asp?RecordID=7

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Jay, Irvine CA
True Blue #4660
Vortech supercharged,BBK X-pipe,Borla cat bcak,Tri-Ax,Alum D/S,18x9-285/35/18 on rear,Xenon spoiler,Powerslot rotors & Hawk HPS pads,MGW int,

<font size=-1>[ This Message was edited by: Bullitt#4660 on 2002-01-23 21:42 ]</font>

<font size=-1>[ This Message was edited by: Bullitt#4660 on 2002-01-23 21:46 ]</font>
 

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Discussion Starter · #4 ·
Thanks for the info 4660. What about HP gains? Have you dynoed your Bullitt with those mods yet. Just curious.
 

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I'll be going to Brothers Perfomance next week to do some dyno runs. Finally got it running up to 6,000 RPM without knocking so I'm good to go. I'll post the results in the dyno area.
 

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Nvr2Fast,

I recommend just going with just the SC. Vortech SCs opearated fine for quite a few years w/out aftercoolers, and they are still safe w/out them. My speed shop installed mine the same time they did an SC with an aftercooler on another Bullitt. They test drove both and felt the aftercooler actually slowed down the other Bullitt. Both Bullitts at the time were only getting 6 psi or so at 5,200 feet. Maybe, the aftercooler starts earning it's worth with more psi?

The money you save can be used for finishing off the exhaust (X/H pipe, better mufflers or complete cat-back, headers?), which are important Mods, especially when SCing. You can always install an AC later too, if you can't live without it.

Anyway, you will love the SC power! Worse thing about SCing is Snow. The Mustang is even worse in snow with a SC. Oh Lordy, Much Worse!

Mike
 

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Discussion Starter · #7 ·
Hey Mike,
Did you notice a considerable difference with the drive pulley and Bassani? Do you have any dyno results, just curious.
 

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You bet I did, especially with the smaller drive pulley. I got substantive gains in rw/hp. Go to the Dyno Fourm look under "Dynorun Bullitt 04009 w/Mods." I got 4 additional psi. DON'T DO IT AT SEA LEVEL --I'm at 5,200 feet and plan to be here for a long time. More than 11 psi, I've been told you could have big problems. I'm running a solid 10 psi.

Also felt a big difference in torque and hp gains with the Bassani X pipe. However, I don't have a before/after dynorun comparison. Sound was meaner and louder at higher rpms. Bullitt 04009 breathed better.

Experienced Mustang mechanics/techs have told me "generally" good exhaust Mods will often double with a SC. For example, X/H pipe with a naturally aspirated Bullitt is 10 hp gain with a SC, 20 hp increase. However, keep in mine this is a generalization, but exhaust Mods are important for SC.

Mike
 

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It is true that you don't need to use a cooler with our supercharger. I went with a the cooler on mine, because, well obvious reasons. =) Do the s/c only and you will be very pleased. I don't believe the Bullitt making less horsepower with the cooler. Just promise me you won't do an air to air.
-Steve
 

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that IS a great pic Nvr2!!!!
 

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Steve,
About the Bullitt with the aftercooler, there is a part two. That Bullitt recently got smaller pulleys too. The same mechanic 20 years working on Muscle Cars and racing) whom said it was slower than mine test drove it with the smaller pulley. He stated it was the second fastest street car he had ever driven. The first being a modded Chevelle SS. This Bullitt has simular mods as mine. So, maybe the aftercooler makes a significant difference with increased/more psi. Before the pulley swap both Bullitts were just getting 6 psi.

Mike
 
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