632C2

It was suggested that I place this post here because alot of you don't make it to the engine mods section:

I finally got everything squared away on the Dry Sump installation and the results are in.

First the great news: 918.66 rwhp and 762.58 rwtq!! Maximum horsepower was at 6700-7000 rpm and maximum torque was at 5900 rpm. These numbers are with open headers and on C12 VP racing gasoline. This equates to 1088.5 hp and 903.5 tq at the flywheel.

The best part is nothing went wrong and my leakdown numbers remain around 1%.

Now for the not-so-great news: After re-installing the same exhaust I used on my 542 that produced 714 rwhp naturally aspirated and 1192 rwhp on nitrous, the numbers dropped to 819.29 rwhp and 692.97 rwtq.

This is about a 100 rwhp and 70 rwtq loss through the exhaust system. Below 4600 rpm the runs with the exhaust system installed produced a little more hp and tq than running open headers. After that, there was no contest.

Now I have to set my sights on producing an exhaust system that won't cost me 100 rwhp yet at the same time be "quiet" enough to drive on the street.

Steve

427V8

Holy Schmidt!

Now thats an engine :smash:

Question; why dont more people put turbos on V8's?

Answer; They don't have to.

stingraymaniac

:eek: :eek: :thumbs: :thumbs:

Gordonm

:eek: :eek: WOW! That is a lot of HP for a street car. Thats awsome

VETDRMS

That's AWESOME! :cool:

Videos? :cheers:

69ttop502

Steve, that is incredible. Congratulations, as much for nothing going wrong as with the numbers. I will be interested to see what you come up with for exhaust. Bill.

GDaina

Details on the robbing exhaust system.....what are you running? Mufflers?

SmokedTires

:thumbs: Great results Steve, now for another one of your amazing dyno run vids ;)

Ozzie71

AWESOME!!! :cool:
Now if I can just squeeze an extra 300 cubes out of my bog stock 350 I would be happy :jester
I don't see any fuel consumption figures??? :lolg: :lolg:
Cheers

Mick :thumbs:

PRNDL

What's the point? :lol: If it is quiet enough to drive on the street, and you are driving it on the street, what are you going to do with that extra 100 hp? Surely you wouldn't miss it!! :) And you actually get more hp out of the muffled exhaust system at lower rpm? How does that happen? Sounds like a whole lot of power any way you cut it! :thumbs:

632C2

427V8,stingraymaniac,Gordonm: Thanks!

VETDRMS,Mike(SmokedTires): Good question about the videos. My problem is finding a place that will host them. The last ones I had of the 1143 rwhp and 1192 rwhp runs were taken down from a couple of different sites that were hosting them because of too much traffic. When I first had them posted they were being downloaded at a rate of 25,000 per month and towards the end they were still being downloaded at a rate of 9,000 per month.

Bill(69ttop502): I have all kinds of ideas running around in my mind right now. This afternoon I will remove the mufflers from the exhaust pipes and make a few runs to see what they are costing me.

GDaina: The exhaust system consists of 4" collectors going into 3-1/2" oval tubing with a Dr.Gas X-Pipe and Spintech ProStreet XL mufflers - all 3-1/2".

Mick(Ozzie71): I am not sure about the fuel consumption but in a very unscientific measurement by the engine dyno operator last Christmas, it appeared to be using a little less than 1 gallon per pull. I didn't want to know any more than that.

PRND21: It is a sickness that I have. I mean, how many people do you know that have a DynoJet in one of their garages? When is enough enough? Got me, but when I get there I will let you know. Next up after the exhaust will be my nitrous system. Let's see, I made 1192 rwhp with the 542 so I should make ??? with the 632.....

Steve

turtlevette

what if you used 4 mufflers?

Corey_68

:eek: :eek: :eek:

427V8

:conehead
(Thats all I have to say)

Jughead

Awesome numbers. :yesnod:

Eddie 70

Those are awesome numbers. I would be tickled to have just half of those numbers in mine.

632C2

Thanks for the comments.

Actually, I have considered 4 mufflers. In fact, my '69 Corvette had 4 mufflers back in the mid '80s. I had Hooker Super Comp headers with 3-1/2" collectors that than split off into two 2-1/2" tubes on each side all the way to the rear. It worked real well. 10.70 @ 140 with street tires and nitrous.

Steve


[Modified by 632C2, 7:05 PM 5/24/2004]

632C2

I just made a run without the mufflers on the car and the power went up to 882 rwhp. Than means I picked up 63 rwhp BUT that also means I still lost 36 rwhp through the 3-1/2" oval tubing.

I am going to go with 4" oval tubing but I will still have to figure out what to do about mufflers.

Steve

gkull

Steve - quiet is a relative term! :D My car isn't quiet, but it's nothing compared to my friends 69 camero with a 510 ci race motor. He made an exhaust system with 4 inch drag mufflers right off the collectors to make it DB compliant with California noise restrictions at their drag strips.

For the street he bought those 4 inch oval pipes that curl up right in front of the rear tires.

Good luck on your no restriction system

VETDRMS

632C2 Turbos tend to quiet the exhaust down a lot... :jester

Where do you get the oval tubing for exhaust? I am trying to figure out how to get 3" out the back without clearance problems (I already had a tubular crossmember fabricated), now its just a matter of getting it out back. The oval shape would help a lot.

Thanks!