Derracudas zermatt 20vt,6spd, 351awhp - July 4th drive vid

my2000apb · Post by **my2000apb** » Sun Jun 21, 2009 3:24 pm

very sexy

my2000apb · Post by **my2000apb** » Sun Jun 21, 2009 3:30 pm

and sounds even better :-D

Matt · Post by **Matt** » Sun Jun 21, 2009 7:01 pm

why is that huge head stuck under your car?? acceleration will be much better if you remove that...

gvr4 · Post by **gvr4** » Sun Jun 21, 2009 8:56 pm

Car sound great. Now I really think you need to build Matt a exhaust for his car. His stock stuff is just not cutting it.

Onwardtothestars · Post by **Onwardtothestars** » Sun Jun 21, 2009 9:02 pm

Yes yes, very fine sound. You do such fine work.

Post by **Hank** » Sun Jun 21, 2009 9:10 pm

Looks good Derek. Got an estimate on weight?

derracuda · Post by **derracuda** » Sun Jun 21, 2009 9:36 pm

gvr4 wrote:Car sound great. Now I really think you need to build Matt a exhaust for his car. His stock stuff is just not cutting it.

right after he gets the gum out of the carpet...

ShavedQuattro wrote:Looks good Derek. Got an estimate on weight?

nope, and i don't really care either. it's not light, but it's not terrible. the resonators aren't heavy, so it's not like i have those huge heavy stock mufflers. anyway, i'm really pleased with the sound

Matt · Post by **Matt** » Sun Jun 21, 2009 10:32 pm

I know nothing about gum....

rallynz · Post by **rallynz** » Sun Jun 21, 2009 11:26 pm

Sounds tits!

derracuda · Post by **derracuda** » Mon Jun 22, 2009 9:44 pm

a little more IC update.

three things are happening here at the same time. i'm building a new intercooler, cross bar, and serpentine belt system for the PS and Alt. so that i have a little more clearance, and i have the old original PS mounting spot cleared up for my future intake manifold with the TB right there.

here we go again...

AAN vs. 3B pulley...

AAN alt. (the alu. bar is for checking the straightness of the alt mounting in relation to the crank pulley)

i have to finish mounting the PS pump, then i can set the IC in it's final resting place and then mount the cross bar as tight as possible. it's gonna be a tight fit!

after some extra thinking about the snub mount, i think i figured out a trick way to build a nice new alu. snub mount 8)

that's it for now. hopefully more tomorrow night!

quattro87 · Post by **quattro87** » Mon Jun 22, 2009 10:05 pm

Nice work Derek!! I keep wondering what I'm going to do once I get the Urq's basic body work done as far as the I/C, A/C, alt, etc. What are you going to do for end caps? You may be engaged, but it's obvious you aren't done building. I like it.

derracuda · Post by **derracuda** » Tue Jun 23, 2009 8:35 am

the end tanks will just be 3" tube.

my2000apb · Post by **my2000apb** » Tue Jun 23, 2009 8:36 am

3" tubes? so liek a 3 into 1 manifold design? or what im not quite following?

derracuda · Post by **derracuda** » Tue Jun 23, 2009 8:39 am

no, a single 3" tube, cut in half, then welded to the top and bottom of the IC.

my2000apb · Post by **my2000apb** » Tue Jun 23, 2009 8:41 am

ah ahha ok sweet, you think that it will flow enough to the sides jsut via the pressure difference? dont you think it should taper a bit towards the sides?

derracuda · Post by **derracuda** » Tue Jun 23, 2009 9:23 am

most OEM IC cores have the same size tanks all the way along the core surface, and on both sides, i don't see how it will make a big difference here.

my2000apb · Post by **my2000apb** » Tue Jun 23, 2009 9:26 am

but arent you going 3 times wider?

my2000apb · Post by **my2000apb** » Tue Jun 23, 2009 9:26 am

woot im the first post on page 50!!!

nynoah · Post by **nynoah** » Tue Jun 23, 2009 12:23 pm

I like the idea of more intercooler, but I have to bring up the question. With things so close how are you going to get good pass through. You can throw TONS of air at something but if there is no good pass through the air will not efficiently go through to cool.

dubsmith · Post by **dubsmith** » Tue Jun 23, 2009 12:41 pm

Derek, check out this site! Tons of good info on intercooler design. Found it awhile back.

http://www.are.com.au/techtalk/intecoolersMR.htm

derracuda · Post by **derracuda** » Tue Jun 23, 2009 3:03 pm

this might be silly math, but each of these cores is designed for 160hp(iirc) for a factory saab 900 from the late 80's. those cars, just as a 5kt, can be tweaked to 200hp or above with increases in boost, on the stock IC. i ran two of these cores on my old 20vt setup, and the IC temps were solid with a k24 at 15psi, even in warm weather. i don't feel it ever was a restriction to that engine and turbo setup.

granted i am now going to be running a bigger turbo and pushing a good deal more air, i don't think i was at the limits of my old IC setup, the new turbo will be more efficient at higher boost, and one more core will add some extra "new" surface area. i've ridden in a few 20vt's that have giant FMIC's, and they don't seem to suffer from having long tubes which create drag and pressure drop, so i'm not terrribly worried about this setup.

also, i had been toying around with some interesting end tank ideas, but we'll see what the finished product reveals 8)

SeStone · Post by **SeStone** » Tue Jun 23, 2009 3:11 pm

I don't think it takes a massive core to avoid pressure drop, at least with a halfass'd decent core like those Saab ones. Looking at Bell's site with their matrix of intercooler cores, you can flow 450hp+ with a pretty tiny core, especially when the core has a short length (measured along the direction of flow). Beyond that it's just a matter of how much thermal capacity you want--I'd say you should be pretty set with that setup d-man, just put some decent endtanks on it.

Sam

derracuda · Post by **derracuda** » Tue Jun 23, 2009 4:32 pm

Sam, i didn't mean that a large core overall prevents pressure drop, i meant more short rows instead of less longer rows will help that aspect. i read somewhere awhile back that in most cases, 6" of row length is all that's needed, the charge air doesn't drop much in temperature very much beyond that. these saab cores are 8" in tube length, so i think it's right in the sweet spot for that. more rows just help with the overall unit being able to shed heat quicker and do it longer, which is what i'm after. i want to be able to track the car for 30minutes and not have IC heat issues.

Post by **HT Motorsport** » Tue Jun 23, 2009 4:43 pm

great quality of work derek.....as usual very inspiring.

:thanks:

my2000apb · Post by **my2000apb** » Tue Jun 23, 2009 4:46 pm

timmmy wrote:great quality of work derek.....as usual very inspiring.

:thanks:

absolute

if it wasnt for this thread my car would be swapped and running already, but not nearly as nice and i am now much much more satisfied, cleaning and detailing and making sure its all nice and tucked and clean and oem esque as possible, thanks derek