Thread: My New Ve Dyno #s

The bigger the cam the less timing you have to run after peak torque. So for example we found that a stock VE cam likes 36 degrees timing up top, but a SR16VE doesn't make any more power beyond 30 degrees.

For any given engine you have whats called 'minimum best timing'. One of two things happens as you keep advancing the timing- either the power stops increasing (and will actually start to fall), or you start getting detonation. On a turbo car your typically getting detonation before the power peaks, but with an NA VE its the other way around.

I stand corrected.

Thanks allot Calum.

I should make clear I was not speaking form expereince but when I always hear that ve's love timing, I figured if I can run 35deg safely then that is probably roughly up where you would want to be...wrong. :o

Mind you I only figured this because the tunes deemed street safe I have run into have sported timing figures similar to what I mentioned.

So this means timing should be backed off after peak torque. Very interesting.
I also wanted to ask you, after looking at numerous tunes, some have the timing curve smooth up to 8k. Others peak at cam switch, then peak again at roughly peak torque. What is you suggestion as far as cam switch goes?



Thanks allot for everyones help hope I am not hijacking too much.

Dudeman

No, you advance the timing after peak torque. The trick is how much you have to advance it. This is one of the biggest misconceptions- 'more timing = more power'. Your eyes open (at least mine did) the first time you see that this is dead wrong on a dyno.

Having your timing curve work with you cam switching is something that has to be done on the dyno, but having those two work together gets you what you see in his dyno runs- a much fatter curve.

Do this- make an excel graph of torque, hp, timing vs rpm. Just start at 3k rpm and use the far right column in his timing map.

Are you going off of Teal97's timing that he posted? I think he made more power with high ign timing because of his cam timing settings.

Ha, very possible. As you can tell I have more then allot to learn. Unfortunately I am having a very hard time finding any information concerning tuning period, more specifically timing. Perhaps thats why so many people out there are so afraid to try tuning their own motors (Honda crowd). The real problem is, I need to answer these questions for myself, using a dyno and allot of time.. Unfortunately thats the one thing I cannot do right now. Thus you have me making emberassing posts on my local forum

Thanks for the help guys.


Dudeman

I don't know that for a fact, I'm just guessing that's why Teal97 could bump the timing up so much. I'm in the same boat as you, I don't want to hit the dyno until I get the realtime. So for now, I'm just going to street tune with the basic so I wont be losing out on money in between the runs pulling the roms and burning them.

Well at least someone understands

My problem is I sit here wanting to make an appointment to go to the dyno, however I need to save every scrap of cash for school (books...)

That said, my incredible urge to learn how to tune these engines will not allow me to not read everything this forum has to offer and become very anxious to try every safe level of timing combination out there in hopes one will feel so good even the butt dyno will approve. This has ended in my discouragement because not only am I going in circles, no one can really help me either..ha But i figure everything I can learn, I can take to the dyno with me. So it's all a good thing in the end. We will get through it together Jer!

Dudeman

You could start off by reading the Ignition section of this guide:

http://www.vems.co.uk/forum/index.php?topic=97.0

There's a bunch of tuning info out there, it's just not on this forum.

nice job man! this is about 213-215whp and 152-155wtq on a dynojet. great numbers for cams and a header! i hope to see this car yet this summer. im making about 200whp on a mustang dyno right now still untuned. im going to get tune here in the next week or so. hopefully with as good of results as you.

shoot me a pm or something. we need to line up a day to meet up at RF

also id like to see your high throttle timing table just for refrence if you dont mind....