351W Dyno Results

[JadeGreyNotch]

Well I made it to the dyno yesterday. The motor is a 351w .040 over, 11:1 comp, afr 205's , solid roller, vic jr intake, holley 750 dp, c-4 w/ 4500 stall, 33 spline spooled rear. The plugs were black after the first trip to the track ( best of 11.70 @ 118). So we jetted it down b/c it was making my whole garage stink of gas. We went from 79's squared to 74's squared.

1st run: 93 octane, 30 deg timing, 74's squared
306 hp, 365 tq
A/F was off the chart lean it was over 18!! Pulled to 7000 and it still wanted to go more. Im too scared to take the stock crank and rods much past 7k.

2nd run: 93 octane, 35 deg timing, 80's squared
295 hp, 351 tq
A/F was at 14.5 but it really starts pulling at about 4k up to 7k.

3rd run: 93 octane, 32 deg timing, 84's squared
315 hp, 378 tq
A/F was about 13.5 and once again pulled hard from 4-7k.

All in all not too bad. It was done at Slaters Mustangs in Houston, Tx on a dynojet. The whole point of going was to check the A/F ratio so I am glad that I got that worked out. Im gona go to 88's squared. I think the reason it was dumping fuel was b/c of a hole needed to be plugged but my carb guy didnt plug it so it was dumping fuel. I think my convertor killed my numbers but Im gona go get some new track numbers soon b/c those are the ones that count! Anyway, I dont think i want to put my car on the dyno again any time soon. It was kinda scary LOL. Almost like waiting for something to let go.... I have the graphs but not a scanner but Im gona try to get a friend to scan it.

[1quick6]

Sounds a little low to me....obviously depending on cam specs. Although 118 is pretty good mph.

[regattacoupe]

Sweet! nice times! Oviously if it traps @ 118 it makes the hp you're after.

whats you're 60'?

Have you ran it since the trip to the dyno?

[fordracing19]

mine makes 360/455 with box stock tw heads. something is really wrong.

[JadeGreyNotch]

Well the 118 mph was when the plugs were fouled and a 1.81 60 ft. I dont think anything is wrong its got a monster convertor in it. Not to mention the fact that a dyno is a tuning tool. The real numbers are track numbers. This car has high 10's on motor if I can get my 60's down now that its tuned decent. The cam is something around .640, .640, and like 280 advertised duration on int and exh. It runs great now and has 60 # of oil pressure. Thanks for the replies!

[1quick6]

I wish you the best, but that thing better 60' real well to go 10's @ 118.

[JadeGreyNotch]

That was with it dumping fuel and fouling the plugs. Oh but I forgot that dyno numbers are the only ones that count for you bench racers.... Not to mention the fact that the car should 60' in the 1.5's so that alone should get it close.

[fordracing19]

when i was having distibuter problems and I couldnt rev over 6k I ran a 11.7@118 running out of gear/rpm. I had 4.10 with a c4 and 26x8.5 et drags. I 60' at 1.55 on the 8.5 tire. That was the only 1/4 times i have. I am now running 7.12@96 1/8 on motor. I have a 4500 stall and still dynoed 360hp with the stock t/w heads and tfs 3 cam and only a 650dp. My carb is at 69/74 on the jetting with a/f of 12.5

[Fomoco347]

Anyway, I dont think i want to put my car on the dyno again any time soon. It was kinda scary LOL. Almost like waiting for something to let go....

I know exactly what your talking about. When i finally got mine dyno'd, it sounded like a sewing machine at 7500 rpm's ! I was standing next to the car and never realized i had to close my ears! Thats with mufflers too...

My motor put down 433hp rwhp through a 8" 5500 rpm converter, C-4. Our combos are almost exactly the same(heads, solid roller, intake, carb)

This motor picked up 1.5 tenths and 3 mph with:

35* timing bumped up to ---> 38*
Sunoco 94 to ---> Sunoco 110

Good luck!

[JadeGreyNotch]

Well I dont know maybe something is wrong but for now its got 60 # of oil pressure and fires right up! LOL I cant really complain. I will be running it on the 27th and see how she does.

[Fomoco347]

Good luck, im with you on dyno # not meaning squat.

[regattacoupe]

I couldn't agree with you more on dyno sheets. I'm paying real close attention to this as my friend is throwing a combo together that is extremely similar. Like you, we build for the track, not the dyno. I doubt there's anything wrong.

[JadeGreyNotch]

Thanks guys! Im hoping to squeeze a couple more tenth outta her and then spray a 150 shot and hopefully break into the 9.90's. I think this solid roller cam needs to go more rpm but I dont trust my stock crank and rods. It was still pullin on the graph when it was shut down at 7k.

[46callaway]

That dyno is definately off. There is no way you can trap 118mph with that amount of HP.

[JadeGreyNotch]

Well something is wrong on my graphs too... I just looked back over them and it shows that the pull was made to 7600 rpm's but that is not right b/c I have the high side of my 2 step set at 7k and I watched my shift light come on at 6800 and he shut it down right after. So their machine is screwy or something?? Does the thing have to be on #1 plug wire? B/c I think they put it on the #5 wire...

[Blk88GT]

Tach pickup was off/not working. If they used an optical eye, try a wider sticker on the balancer. If you have a shiney balancer and use an optical eye, you will have some issues until you sort that out, I did.

Has to be #1. 1st cylinder on the left.

[1quick6]

Doesnt have to be number one cyl. Can be any plug wire. I work at a dyno part time. www.midatlanticdyno.com

[99TigerGT]

what other mods do you have on your car?

[Fomoco347]

Are you running a power valve in the carb?

[bottlefedgt]

dude your jetting that wrong unless you have a power valve on both sides. might wanna check that out. you numbers seem pretty low to me. may have ben the dyno. mine dynoed 410 at the wheels on motor. in sig

[Fomoco347]

You usually square the carb when NOT running a power valve

[90lx351]

hell see my sig for numbers on unported gt40 heads, the afr's should murder them on you rmotor

[bottlefedgt]

Originally Posted by Fomoco347

You usually square the carb when NOT running a power valve

actually no...usually a carb has no power valve on the secondary, in which case it wouldnt be squared. if it has a power valve on both sides ...then yes, it would be squared. i think im thinking right as its kinda late, but correct me if im wrong

[Fomoco347]

Wrong .......check out all the Holley HP and Demon carbs, hell even my Pro Systems 1,000 cfm carb has a power valve.

[bottlefedgt]

yes all carbs usually have a power valve. thats not what im saying. what im saying is,does it have a power valve on BOTH primary and secondary sides.if so, then yes, it should be jetted square. if you dont have a power valve on the back(which hes running a 750 DP,not a HP) then the rear jetting should be approx 5 sizes bigger. my 1000 HP holley has valves on both sides and is jetted square

[todd95GT]

My 830 9381 Holley came with a secondary power valve and square jetting so that is normal. I blocked off my secondary and gapped the jets appropriately.

Those numbers seem very low, loose converter or not. My 359 is trapping 116 with a terrible state of tune and cleaned up Windsor Junior small valve irons. And that was with only a 1.79 60'.

[Blk88GT]

You square a carb when running no valve.

I think that your car needs more fuel. Bigtime. You should be shooting for an A/F in the 12.60 range IMHO.

The more fuel I added with my car, the more power it made. Ed Curtis was right, it made the most power in the low 12s A/F wise. Don't forget, it's going to lean out a little at the track as compared to a dyno as well.