injector leak/dyno vid/MORE POWER!!

spetz01

Registered User
Here was the problem I had (lol, like there was just one) last Nov when I dynoed..

http://<embed width="448" height="361" type="application/x-shockwave-flash" wmode="transparent" src="http://i98.photobucket.com/player.swf?file=http://vid98.photobucket.com/albums/l241/spetz01link/leak.flv">

Finally got my ~~~ in gear and fixed it today. Turned out #5 was the cause. Not sure what went wrong when I put them in, but anything over a few PSI and the fuel would leak out. Pretty scary when I first saw it.

http://<a href="http://s98.photobucket.com/albums/l241
/spetz01link/?action=view&current=Picture037.jpg" target="_blank"><img src="http://i98.photobucket.com/albums/l241/spetz01link/Picture037.jpg"
border="0" alt="injector"></a>



http://<a href="http://s98.photobucket.com/albums/l241/spetz01link/?action=view&current=Picture038.jpg" target="_blank"><img src="http://i98.photobucket.com/albums/l241/spetz01link/Picture038.jpg" border="0" alt="leak"></a>

Even had the new head of security out "protecting".


http://<a href="http://s98.photobucket.com/albums/l241/spetz01link/?action=view&current=Picture046.jpg" target="_blank"><img src="http://i98.photobucket.com/albums/l241/spetz01link/Picture046.jpg" border="0" alt="voost"></a>

So when I dynoed last year on 5 cylinders, even 5 1/2, she pulled 280 RWHP. Can I assume that each cyl at that point was averaging about 50 hp?? Without going back for a pull, can I assume that running on all 6, she's be in the 320/330 range? Please say yes so I can feel better about sinking so much cash into something that won't even break 300. I'll try a seat of my pants version later tonight.
 
The first drive went well...the mild surging that was there is now gone. I guess she's running on all 6, no misses.

But the second drive, she sputtered a bit and the tach wwas jumpy. Perhaps something came loose?
 
Check it again. Perhaps something is damaged and it continues to slip out. Good to hear about some progress!
 
Describe what you felt a bit better. Was there a steady tach signal? Did you change anything else? What did you do before you figured out the injuectors were leakin on the outside. I would be willing to bet that you will be REALLY close to those numbers with all six working properly. With a 5.0 making 245 at the rear wheels, the guy told me what his combo was and I guessed 278-285 at the ground. He said 245 and I asked him what was wrong. He asked how I knew there was a problem but then said the guy at the dyno said he had a miss. He said later he had a plug that had come apart and has since fixed it. The guy at the dyno said he was down 30HP or so because of it so I would bet you will be close to the 320 number.

Chris

P.S....your dog looks like a puppy:D
 
She is only 9 months old...

I looked today in the light, and the wire loom from the crank sensor was rubbling on a pully/belt. Almost went through, good thing it only ran more a few minutes.

AS you can see from all the blue silicone, I thought the leak was on the plenum, intake as well as on the blower. I could really see it during the day with the hood off.

Update..

Drove it all afternoon around town..never missed a beat. She was wanting to stall when I was coming to a stop, when it was quite warm, but even that went away. Might have been the fuel that was from last season.

I think I'd like to do gears next. Whats in a 90 spd? I see alot of guys go to the 3:56's or so.
 
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all 5spd sc's are 2.73:1 stock. aything numerically higher than 3.27 starts getting less and less streetable, imo... i have 3.08's in mine and rarely ever need 1st gear on the street...
 
OK that helps..I knew 3:56's were too high, my buddy's got them in his Mustang, my dad had 4:11's in his 64 Malibu SS...neck snappers.
 
I wouldnt say you were firing on 5 cyl that day at the dyno...Definitely didnt sound like that..If you were having a fuel leakage issue and it was taken care of Im sure that would equal to a few ponies...But not what your expecting unless you did more in the name of performance.

Goos luck and look foward to hearing what you make
 
With stock heads and cam, your already making better power than I would expect. I don't think your going to see much if any gain from fixing the leaking fuel injector.

David
 
Thats why I said 5 to 5 1/2 cylinders, and I don't have a stock cam. Besides getting a Coy Miller block, I didn't cheap out anywhere.

I know its hard to see from the vid, but I don't think even a 1/4 of the fuel was making it into #5.

My total shock that this car only made 280 rwhp had me hoping that something was leaving 50 horse on the table. I know not to believe advertised horsepower gains, I can't believe that no one has put it on SCP or Magnum to maybe be somewhat more realistic in their advertising.

I was on those site the other day just browsing and had to laugh at what they still say to expect.
 
Thats why I said 5 to 5 1/2 cylinders, and I don't have a stock cam. Besides getting a Coy Miller block, I didn't cheap out anywhere.

I know its hard to see from the vid, but I don't think even a 1/4 of the fuel was making it into #5.

My total shock that this car only made 280 rwhp had me hoping that something was leaving 50 horse on the table. I know not to believe advertised horsepower gains, I can't believe that no one has put it on SCP or Magnum to maybe be somewhat more realistic in their advertising.

I was on those site the other day just browsing and had to laugh at what they still say to expect.

Jim,

I was just going by what was listed on your member page, you having a cam does help explain how you were able to make 280 rwhp. To the best of my knowledge, nobody has made 300 rwhp with stock heads and cam unless they were using a twin screw blower. I suppose it's possible with only a cam, but don't recall seeing it done yet.


.30 over rebuild, heads rebuilt (stock specs for both) Magnum Powers III conversion, 3 1/2" MP cold air and divider, 85mm MP throttle body, 76mm Lightning MAF, Raised SC Top and Rear Plenum, Magnum Powers FMIC, 16" pusher fan,Billet pullies, 15% OD (10 on sc, 5 on Jackshaft) 42# injectors, Livewires, Screamin Demon ignition coil, 225 lph fuel pump, Kooks mid length headers, 2 1/2" Stainless True Dual exaught, Magnaflow mufflers and resonators. SCT chip

The HP claims made by vendors are usually the best case and will vary wildly depending on what other mods you have and what order the mods are installed. For example if you build a motor with great heads, monster cam and big fuel system, your likely to see big gains from upgrading the exhaust. But if you did all that stuff and still have a stock early model blower you won't see much until upgrading to a better blower, then you will get higher than average gains. I generally cut all claims in half, and even then you may come up a little short on the dyno.

David
 
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Jim,

As David said, you can't expect to see those exact numbers.

Also, their 310 rwhp recipe requires an MPX and has an 80 mm MAF.

You do not mention a tune in your build up. A good tuner could up your total by a significant amount. Your setup may not be living up to its maximum potential without a good tune.
 
Good ~~~~ing luck! You should be happy with what you made. Take a look at my mod list and I did not even brake 240 HP. You should be happy spetz! Come down to Calgary in June when double D is here and we'll line up on the dyno.
 
Thats not true Flex...Even before before the MPX came out they claimed high numbers. Gotta remember that this rebuild is now in its 3rd year, MPX are only a year old are they not? I'm only off by 4mm on my MAF, can't be loosing much power there.

I also did get a tune...mind you it was his first SC, but he did manage to get the backfiring issue solved.

Don't get me wrong guys...this car is now aweome, sounds so good, fun to drive, just want my 75 extra horse :)

I guess I could add really good heads, 60# injectors and add 10% more to the OD. And also, when I built the motor there was a miss communication, which resulted in a stock, bored out rebuild, heads included. Probably left some serious potential out there too.

When is Dave coming to Calgary?
 
Jim,

I have had personal experience with this and have spoke with Dave on a few occasions. Head porting makes a huge difference in the potential of the motor. A cam may net you a 15 horse gain on a stock engine but 30 or more on an engine with ported heads. Same for all the components you have. The heads may actually be limiting the potential of your blower as they are not capable of handling what it can put out.

If I was you and wanted to maximize your power, I would have a set built or buy a set from someone like Dave. I went overboard with the one I am building for my brther and bought alloy seats and guides along with custom 7 mm valves. Just those parts were about $800. I also pcked up beehive springs with Tianium retaiers for another $250. I don't know what the machine work will be yet.

My friend John Ludorf says Dave is coming up to Edmonton this summer to bring his motor and help him tune it. I know you were having Martin tune your engine but he might not have enough insight into the aspects of the SC.
 
I know...like I said, things went ahead without any input when the motor and heads were done. If I could sell my heads, that are now new, I might consider upgrading. I'd have to see what a similar combo like mine would put out with said heads. If its like 20-30 horse, i'd have to just be happy with what I hae.
 
AFI Performance? I remember when he made a post on a local forum asking about SC's because he had a customer who wanted to play around with his. :p Small world.

DD is suppose to be here in mid-June, who knows for sure! :D Lots happening. John has got a DD Long block, Marty has a DD Long Block and I have (after I install it) DD upper engine kit. Should be an interesting dyno session! :eek:

If your interested in getting some heads done up place a order now. There is usually waiting lists at all the major vendors. :)
 
I know its hard to see from the vid, but I don't think even a 1/4 of the fuel was making it into #5.

You were still most likely getting the right amount of fuel. There is a WHOLE lot of fuel going through the factory rails, allot of which goes right back to the tank. If your looking for 70 or so HP you may find it in a combination of a tune and some more boost.

Again good luck
 
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