[DaveBob1]

I just got done with a fresh Dyono and feel the torque and HP levels can be brought up by tweeking the cam and ignition settings.
The combo link is here.

http://www.turboford.org/ubb/ultimatebb....3;t=016303

The initial cam setting is straight up, and the base timing was 6 deg adv.
I figure maybe not messing with the ignition, by suggestion of my tuner man.
But, through reading up a bit I may be able to increase the effective torque by retarding the cam a bit, I'm hoping this wil lower the exhaust pressure within the cylinder a bit.



What can you guys suggest, from your best settings, to help save some time on the future Dyno pulls.

[NewToTurbo]

Well, from the looks of it your base timing is to low(stock is 10 deg). Looking at your combo you should have alot more torque than you do. Bumping you base timing will likely see big gains in torque and HP. I say at least 10 deg base and see what it does. I think you'll be surprised. You said you have a tuner to burn chips for you right? You may be able to go higher on the timing then have the chip burnt to pull more as your RPMs increase.

Last time I dyno'd my car I picked up 17 hp and 15ftlb of tq by rasing my timing 2 deg. and dropping my boost 2 lbs. Theres a fine line between the two. Total of 306 hp and 335 tq.

My base timing is set at 15 deg. Then it goes up to 32 deg @ 3000 rpm. At that point I start pulling timing. By the time I get to 6500 I'm at a total advance of 22 deg.

As each motor is different you will just have to see where yours is happy. But I would really be looking at the timing first and see what you gain. My bet is there is alot more power there than your seeing at this point. I'm guessing over 400 RWHP with just some more timing and maybe a a few lbs of boost(boost increase may not be needed).

As you can see from my number above your motor only put down 18 more ftlbs than mine did(yet 50 more HP) and you have alot better setup than I do. So i see lots of potential in your combo.

Remember keep the fuel good. Its your biggest saftey net.

Matt

[DaveBob1]

As you can see from my number above your motor only put down 18 more ftlbs than mine did(yet 50 more HP
I agree on small difference in torque Matt, but I'm actually quite thrilled with results. If what you say is true, that I have only 18 more torque, yet 50 more h.p. Then power to weight transfer on my combo has an extremely healthy wide torque constant, which equates to a strong steady pull down the track.

I've been deciphering the majority of other 2.3's and found others are running d-port heads, and way smaller cams, which may equate to the rapid high torque output, followed by a more pronounced and dramatic drop in torque. (Hence) The high initial torqueX time constant equating to the lower h.p.

Where-as the oval port head, and high lift cam, and resticted exhaust, of my engine may have flattened, and prolonged my torque and power band out a bit. See how wide my torque band is here http://www.four-banger.net/images/Dyno-2.5-stroker.jpg

I'm done debating with myself on this one.
As soon as I have access, I'm going to go advance the timing 2-4 deg. first, bump the fuel a couple lbs. and then maybe retard the cam 2-4 degs. and make a pull each time.

Thanks for the input Bro!

[Mike Abbey]

I may be late in responding to this. But my experience showed 2 degrees of retard in the cam timing was best for power.
Wow... I wish there were a forum like this when i started building my car in 1987.
and I'll repeat what Matt said.... USE THE BEST FUEL AVAIABLE.
Mike

[Ted B]

Originally posted by Mike Abbey:
But my experience showed 2 degrees of retard in the cam timing was best for power.

My experience shows that the above statement is absolutely ridiculous.

[Turbopit]

Uh, which cam are we talking about guys? What other mods?

[daggysvo]

Originally posted by NewToTurbo:
As you can see from my number above your motor only put down 18 more ftlbs than mine did(yet 50 more HP) and you have alot better setup than I do. So i see lots of potential in your combo.
Matt

For whatever it's worth alot of cars keep the torque and the hp pretty close when your talking max numbers. I know he has a stroker motor but the 2.5 shouldn't add that much more then a normal car. I've heard and extra 25 and lower in the rpm range from a few people.

I do think you will gain hp and a good bit or tq when your raise the timing and play around with cam timing.

A fellow member of this board did 270rwhp and 370tq on a mostly stock motor with a bigger turbo and a standalone. Doesn't mean that he needs tuning it's just how well does the engine flow at a higher rpm that reflects his lack of hp.

So don't worry about the amount of difference as long as it's coming in at a good rpm and holding pretty well through out.

Looks good on the numbers btw.