[bowtiekilr]

I have a 88 notch with a 357 windsor. Victor jr heads, Victor jr intake, holley 650 vodoo 2200-6400 cam Pro comp c-4 with a 4000 stall trans break 4:10 gears slicks, etc. Car has plenty of fuel pressure also.My best has been a 12.9 at 105 mph. Every one i talk to says i should def be in the 11's. Car hooks on slicks. My question is my converter is suposse to lock up between 4000-4500 rpm. When i hit the trans break it locks up at 3100rpm max. Do you think thats why im not running in the 11's. Could the extra thousand or so rpms help that much? Its a tci 10 inch race converter, i called them and they said they couldnt loosen it up any more i would have to go to a 8 inch converter. Any help would be much appreciated!

[heavy metal]

I am thinking maybe the Holley 650 is not enough carb for that engine.

[wicked65]

is the car dyno tuned?? what cam is in there?? Compression? Any head work?

[bowtiekilr]

The car hasnt been dyno tuned. It has been on a wide band though. Out of the box vitor jrs. Car had a 750 on it and it was a dog out of the hole. Pretty sure its not the carb. My friend has a similar combo in a 95 gt and runs 11.5s with a 650 holley. My engine has 11.5 to 1 compression ratio. The cam is a Lunati vodoo 2200-6400 rpm cam 233/241 Duration 554/572 lift. Ive messed with timing, three different carbs holley 650,750 edelbrock 750, dif dist and cant figure it out. Car has plenty of fuel pressure. Im about out of options. I just would think it should put down better numbers than that especially with a trans break.

[wicked65]

What are your 60ft? Gears? Car weight? Shift points? You said its on a wide band, so whats that reading?

[bowtiekilr]

Im not quite sure of the weight of my car but its a street car with a cage and subframes and i weigh 175. I cant remember the reading on the wide band becuse it was several months ago but it was safe. Not to rich or to lean. The car has 4:10 gears in it and when i hit the end of the quarter i was at about 6200 rpm give or take. I also shifted at 6000 rpm each time. My 60' was a 1.87 Im stumped

[95gts silver/bl]

yall making me want to get off all this high dollor fuel inj. stuff and buy me a BG IF A HOLLY AND THAT SIMPLE COMBO GETS THAT # .BUT IM WAITING TO GET TUNED AFTER I FIX ELECT PROBLEM (WAITING ON HARNESS)ITS SO DAMN EXSPENSIVE TO TUNE THESE FUEL INJ. BUT I HAVE NOT TOUCHED A CARB IN 20 YEARS ALMOST SINCE THE 5.0 FUELIE WAS BORN

[mmb617]

Your trap speed and et are pretty much in synch so I think the problem is an overall lack of power, rather than a problem with getting the power to the ground. I'd expect your combo to trap a fair amount higher, maybe 112-114 or so.

I have more cubes than you, but you have better heads and cam than me so we probably should be close in power, and I trap 117. My car is only 2950 lbs, so it's likely a good bit lighter than yours but still something is seriously wrong.

It might be worth your while to get the car dyno tuned. The tuner might see something obvious that's not right and give a clue where to look for a solution.

If the a/f ratio is good, and the timing is correct with a strong spark the only other thing I can think of is loss of compression. Perhaps a compression and leak down test is in order.

[CAPRIRACER468]

i think that 60ft is lacking. you should be around a 1.50 to 1.58 for a 60ft.maybe traction is the problem. that stall speed seems low as well. should be up around 4200 rpm. i thick if these problems were resolved you would see some 11s runs.

[mmb617]

Originally Posted by CAPRIRACER468

i think that 60ft is lacking. you should be around a 1.50 to 1.58 for a 60ft.maybe traction is the problem. that stall speed seems low as well. should be up around 4200 rpm. i thick if these problems were resolved you would see some 11s runs.

I have to disagree. While the short times aren't great they're not all that bad. 1.5 60's at this power level are unrealistic IMO. Especially since this is a full weight car.

The main point I want to make is that the trap speed is pretty much unaffected by traction issues and is a truer indication of the amount of power being made, regardless of et. Normally when traction is the main issue the et will be high compared to the mph. If I spin a lot my et shoots up, but the speed stays about the same.

This car runs 12.9 @ 105 mph which is about right in comparing et to speed. If you're ever gonna run 11's (a full second faster) you need to trap close to 10 mph faster. The inability to do that says you don't have enough power to accomplish the goal.

I don't know squat about auto transmission cars so maybe a different converter that helps launch higher in the power band would help some, IDK, but I think there is some major problem why this engine isn't making the power it should.

[bowtiekilr]

Well thanks for the feed back. They also did a compression test on it and it was normal. The engine only has about 6 passes and maybe 100 miles on it since the rebuild so its not some thing thats been sitting around for years. My converteris suppose to lock up between 4000-4500 rpm and it locks up on the trans break at 3100. Im riping the converter out and sending it back to be checked out. I know that extra 1000 rpm would help some,but not sure if it would be worth a sec and a half. Any body know a good place to get it dyno tuned aroung pittsburg, pa or youngstown, oh?

[89mustang351w]

Well there could be many problems, but im not sure what direction to point you. I think that you might be getting too much traction with that low of a stall on slicks. It might pick up alot if you can get it up higher.

My dads 82 has a stock 302 with the x303 ford racing cam and trick flow high port heads with 411 gears and a 5000 stall and it runs 11.30's with the car weighing 2800 lbs. It is a horrible engine that smokes, but it has heads, cam, gears, stall, and some suspension to make it work like it should not.

Here is my car specks:

On engine- 12.84-12.98's @ 104-105 mph 1.79-1.85's
On 100 shot nitrous- 11.52-11.70's @112-114 mph (have to find my time slip for the 60 foot, cant remember.
3400 lbs with me in the car
Compression is 8.1-8.5 I think

351w stock rotating assembly
Dart cast iron heads ported and pollished 2.02 valves
X303 Ford racing cam
Edelbrock RPM Air gap intake
Demon 650 carb
BBK shorty headers with x pipe and flowmasters
Stock suspension with Eibach drag lauch springs and welded lower controll arms
3200 stall converter footbrake launches from 2000 RPM
5600 RPM Shifts
3.73 gears
battery relocated to the back

This setup was fairly cheap, considering I paid 100 bucks for a junkyard engine 50 bucks for the c4. The right combo of cam intake and heads makes the world of difference I guess. Im not actually sure why it runs as good as it does. Hopefully this helps you out.

[cindys_sn95]

CONVERTER! need at least 4000-4500 rmp range.

[cindys_sn95]

also bump your shift rpm up.probably 65-6800 rpm.

[bowtiekilr]

I took my converter out and i am sending it back to tci to see if they can loosen it up any . My friend had a ucc converter and i put it in. It locked up at 3900 rpm and it felt stronger and didnt fall on its face in 2nd gear like it did with the tci. hopefully they can get it to lock up at about 4300 rpm on the trans break and i think that would help alot. Im also gonna go fom a flat tappet cam to a hydrolic roller custom cam so i should def be in the 11's on motor this next season.