sooo much tuning to do with my engine

[urban_cowboy]

Those accelerometer things use vehicle weight and forces to calculate horsepower. I see you put 2600lbs as your vehicle weight. Have you weighed the car with you in it as tested? That seams light. If you do not put enough weight for the car, your horsepower estimate will be off (low). The mileage times should be accurate though. Look at my post in the general section about the G-Tech vs the iPhone Dynolicious. The iPhone was MUCH more accurate.

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[kalli]

not too concerned about the HP readings from G-Tech, and yes, 2600 is probably too light. As you say the times 0-60 and 1/8 should be about correct. even if it's half second off, it shows me the ballpark.
I heard about the iPhone application before and have seen that video with the Mini. have to fgind some1 with an iphone :-)

[kalli]

here's exactly what I'm concerned about:
http://blog.tmcnet.com/blog/tom-keat...e-app-ever.asp

2500lbs carwith this data:
1/8 mile 11.7@76mph
1/4 mile 16.73@100.9mph
result: 220HP

i just have to stop trusting those calculators. with his ET he should be at 100HP and his MPH on 1/4mile tends to show 200HP ... that's huge difference

[kalli]

Results:

with 14 degrees initial I measured the following total (without vacuum at crank)
1000-14
1900-14
2000-22
2500-27
3000-32
3500-34
4000-38
4200-39

this gives me the following distributor curve compared with 2+2GTs version (based on the fact that crank=2xcam):

rpm | 2+2GT | my car
350 | 0-1.5 | 0
500 | 0-1.5 | 0
750 | 0-1.75 | 0
1000 | 2.5-4.75 | 4
1500 | 7.75-10 | 9
2000 | 8.5-11 | 12
2100 | 11 | 13

rest unknown as I couldn't rev higher

unfortunately I couldn't rev higher as I felt sorry for my neighbours already. The curve looks good, but I have to disconnect vac advance. I think it's way to agressive. 16 degrees added by vac advance at idle :-(

what I still need to test is what happens if I rev higher than 4200. does it stop advancing? if not, this will be my problem with lack of power up top (too far advanced). i can't find those bloody stoppers that came with distributor anymore ... *cry*

Kalli

[scootchu]

I feel like I am in the same boat as you with forever tuning and chasing my tail. It's an Edlebrock carb? I just switched rods in mine to richen it up at cruise mode, where I heard the pinging under light throttle.
If it's the Holley, then I have no idea, because I had that pinging when I just touched the throttle.

My initial is 12 degrees and total is 36. I welded the 15L slot on my plate to what was supposed to match the 10L, but I think its a bit bigger, hence the 36.

I just dialed my vacuum all the way out. I also went back to Ported, since using manifold it wanted to hold the vacuum to the dist and stay advanced. I am going to pick my daughter up in a few minutes. I will report back.

I read a thread in here where someone said "don't dial out your timing, richen up your AFR"

[kalli]

i'm back to the holley 570 street avenger. and yes that pinging i hear is just under very light6 throttle, especially uphill. i disabled vacuum advance now as I can't adjust it. see how that goes. and I'm missing tohose 15L etc thingies to actually have a max centrifugal.
i believe I have to fix that first.
with the edelbrocjk the A/F was good in cruise (13.5:1) from stock, but on WOT it was pig rich (near 10:1), i took smaller secondary jet and a rod with a bigger small diameter and that helped a lot. i brought it up to 13:1, but then I swapped carbs.
I have to make sure my ignition is bang on, before I want to tackle the carb again. otherwise I'll never get it right ... i'll go again to search for the parts for distributor

[wrenchturner75]

ok kalli, heres what i would do at this point, set your initial where the engine likes it, advance it till you get max vacumn or rpm reading and tighten it down, let it sit for 2 or 3 min then try to restart it, if it starts hard retard it till it starts normal and check your timing and note what degrees you have, now you have your initial, now you want your max timing to be all in by 2500-3000 rpm, no later. try a lighter set of springs to get it to come in sooner. ive gotten lucky already by glueing small pieces of vacumn tubing over the advance pins to limit total advance, some guys as mentioned above actually weld the slots, a lot of work but its guranteed to work! try to limit the total timing to 36-38 degrees no more or you will have a ping, this should work well enough that you may not even need the vacumn advance. and im sure you already know to have the vacum hose off the vacumn advance and plugged while doing all of this. good luck it takes patience but the results are well worth it, by the way i feel your carb is too small for your app, if you can try a 750 i think itll put a **** eatin grin on your face!

[kalli]

thanks for the ideas. next thing i'll do will definetly be to restrict the advance, so they won't go past 36
i'll try the lighter spring as well to have it kick in earlier, but will check on the centrifugal advance and ho i can limit it first

[kalli]

I FOUND THEM !!!! those bloody spring and lock set. 3 hours searching, well worth it. i'm excited to try them tomorrow, just download the manual to see what each of them does. the great thing is I can limit it to 36, no matter what springs I have and then fool around with the springs to curve it with a fixed max at 36 :-) happy days

[Starfury]

Originally Posted by wrenchturner75

by the way i feel your carb is too small for your app...

750 is way too big for a 302. It's too big for my 331, even. Even at 100% VE, which the engine will never see, that's 524CFM @ 6k. There's nothing wrong wih the 570 he has on it right now. Overcarbing is only going to result in decreased throttle response and fuel efficiency.

Glad you found the set, Kalli Good luck!