If you are encountering login problems please check here

Few questions
#21

Vince if you take a second and think about that you will see the problem.

Say your car runs a basic 32 degree's of timing at say 5000rpm now add to that 30psi of boost and subtract the amount of timing your suggesting and your left with 2 degrees of timing. Total timing of 2 isn't going to allow the engine to perform worth a ****.

Also consider they say to take out 1-2 degrees for every 50 hp worth of nitrous and just use the math.

50hp takes out 1-2 degree
The same amount of boost needed for the 50 hp call it 3-4psi pulls out 3-4 degrees.

When you up the amount of hp say a 150 shot vs an extra 150hp worth of boost call it 10-12 and you see the problem. It goes from 3-6 degrees of timing subtracted on nitrous to 10-12 degrees of boost.

This doesn't account for colder plugs or any other variable that would come into play in real world applications.

Most of the fast guys are running more like 25-30 degrees of timing while under boost where in i'm only running 16.
Reply
#22

I don't think nitrous would factor in. Just boost.

A normal turbo ford engine is low compression. The turbo increases the compression ratio by forcing air into the cylinder. The more you increase boost the more the compression ratio increases.

Essentially our engines are designed to run under boost with a normal timing curve. Once you go about about 16 psi pulling the timing back should come into play.

If you are running 24 psi the 16 degrees you quoted is proably about right.

Something else to think about is spark failure. 24 psi creates a very high compression ratio. A lot of spark plugs cannot handle that much compression. You may need to reduce your spark plug gap. Another option is use something like the NGK Iridiums.

Either way I'm sure your issue is ignition related.
Vince Callaway
Proud (and broke) Merkur Owner
Reply
#23

I don't really have an issues with it. I'm more saying I believe there is more power in the car with extra timing.

Jon Dell stated he runs 27-28 degree's at 30psi.
Joe Morgan also said he runs alot of timing under boost.
Jon Huber has also said the same.

Those are just some of the well known guys that i've got answers from not to mention some of the other board members in the 400hp range.
Most combos that are making good power on race fuel run alot of timing. So i'm eager to to try it with more timing and see what happens.


Went to the track tonight just for fun and was curious about what kind of mph I could get. The answer is 92.4mph. It will go faster when I get enough traction to give it full throttle all the way down the track.
Reply
#24

Certainly right about the pissing contest!

99% of my experience with boosting is with superchargers, none of them going over 10psi. Not retarding the spark (from stock) can rob horsepower.

Hopefully by spring I can get things done and get some quality dyno time myself.

Too many projects, too little money.
Vince Callaway
Proud (and broke) Merkur Owner
Reply
#25

Quote:Originally posted by daggysvo:


Jon Dell stated he runs 27-28 degree's at 30psi.
No, I actually "said" 25-26 degrees.

There is a big difference. Especially to those not running a crank trigger, where you might actually "slop" around to 30+.
9.25 @ 145 in 2002 ?.?? in 2015.
Reply
#26

Sorry Jon I stand corrected.

Good point about the crank trigger to I hadn't even figured that into it.
Reply
#27

Quote:Originally posted by Joe Morgan:


Typical WOT timing on a 2.3 turbo is 25-30 degrees...totally stock, from the factory as it rolled out the door.
:headscratch:

Under heavy load it's more like 12-17. On pump gas I can hardly run 15 degrees total timing at peak load with stock'ish boost levels.
'85 XR- C4, megasquirt, cfi's, E85, home-built IC, T3.
'91 F350 4x4- 460, megasquirt and HX55 coming.
'00 Lincoln LS- 5spd, begging for boost.
Reply
#28

Reply
#29

Maybe instead of worrying about what numbers you should/shouldn't be seeing in your timing tables it would help more to compare plug readings with mph/dyno results. Wherever the most power is made with the least amount of timing the happier your engine will be.

I feel there are too many variables to try and compare your numbers with anyone elses.

FWIW, I only run 16deg total from 12psi on up - mainly because I don't have any timing controls. I used to kill parts trying to run 22-24 like I "thought I should".

One more small tip - it seems the head will lift slightly and push coolant from trace detonation before there are any signs of it on the plugs.


Half Fast Racing
-------------------------------


Just a nobody with a slow car.
Reply
#30

Reply




Users browsing this thread: 1 Guest(s)