I just looked at one of the vids of my car racing from a roll. I dont see any lag. Cause as soon as I hit it my rear is like 2inch off the ground on the pass side. One another note Does less timing get rid of turbo lag or make it worse?

 

I think it gets ride of lag, atleast it will give it more power NA.

Lag is when i put it in 6th and oly get 1psi (crusing at 1600rpm)

glad i dont have a whippy 3.0 straight six were i have to wait till 4k to get any boost at all and only make 200rwt at 4k

 

damn ya I would say thats lag <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> .

 

Reducing timing will reduce lag because the exhaust gasses are hotter when they leave the head. This causes faster spool cause the exhaust has retained more energy, so it has more energy to impart to the turbine.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by smokinHawk:
<strong> I think it gets ride of lag, atleast it will give it more power NA.

Lag is when i put it in 6th and oly get 1psi (crusing at 1600rpm)

glad i dont have a whippy 3.0 straight six were i have to wait till 4k to get any boost at all and only make 200rwt at 4k </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">don't be mean to the supies <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by neat:
<strong> Reducing timing will reduce lag because the exhaust gasses are hotter when they leave the head. This causes faster spool cause the exhaust has retained more energy, so it has more energy to impart to the turbine. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">does running rich do the same thing. I'm running low timing and rich on my built motor right now NA and when I went to open my cutout it was soo hot I couldn't touch it. It became reallly hot just in idle

 

I need some lag tires smoke at any speed

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by AlienDroid:
[does running rich do the same thing. I'm running low timing and rich on my built motor right now NA and when I went to open my cutout it was soo hot I couldn't touch it. It became reallly hot just in idle [/QB]</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">It would depend on how rich you were running. Normally rich means there is too much fuel in the CC to be burned effciently. At that level, EGT will not rise. However, if contine to richen the mixture, you will eventually get enough fuel so that some of it is not burned at all. Introducing unburned fuel into the exhaust will actaully cool the EGT. It also usually results in an auidble pop from the exhaust every once in awhile.

As far as your cutout getting too hot to touch at idle, I dunno? Where is the cutout? There are a tone of things other than A/F ratio that cause an increase in EGT. A few more details please.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by neat:
<strong> Reducing timing will reduce lag because the exhaust gasses are hotter when they leave the head. This causes faster spool cause the exhaust has retained more energy, so it has more energy to impart to the turbine. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I don't know about that...so you're saying that if I just put a heater on my turbo I should make more power...that would add more energy.?.?.

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by AlienDroid:
<strong> does running rich do the same thing. I'm running low timing and rich on my built motor right now NA and when I went to open my cutout it was soo hot I couldn't touch it. It became reallly hot just in idle </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Running rich will actually make your exhaust gasses cooler. That's why people turn off the cat overtemp protection. When the computer thinks the cats are getting to a temp that will do damage, it dumps more fuel into the engine lowering exhaust gas temp. The side effect is to run rich and lose power.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by FASST:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by neat:
<strong> Reducing timing will reduce lag because the exhaust gasses are hotter when they leave the head. This causes faster spool cause the exhaust has retained more energy, so it has more energy to impart to the turbine. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I don't know about that...so you're saying that if I just put a heater on my turbo I should make more power...that would add more energy.?.?.

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by AlienDroid:
<strong> does running rich do the same thing. I'm running low timing and rich on my built motor right now NA and when I went to open my cutout it was soo hot I couldn't touch it. It became reallly hot just in idle </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Running rich will actually make your exhaust gasses cooler. That's why people turn off the cat overtemp protection. When the computer thinks the cats are getting to a temp that will do damage, it dumps more fuel into the engine lowering exhaust gas temp. The side effect is to run rich and lose power. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">FASST, LOL, The heat would have to be in the exhaust gases, because the more heat the harder they push to gets the hell outta there. Go get a chemistry or physics book and look up Gay-Lussac's Law if you don't believe me.

Thanks Neat, My cutout is after the cats under the passenger rear seat or at least where the seat was.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">.
[/QB]</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Is it the actual heat, or the exhaust pulses that do the work with the turbo. I have heard people claim both. Anybody know for sure. Maybe it's a combination. But which one is it really , or which one is the main one.

 

AlienDroid, I was just being facetious about the heater thing, sorry. LOL <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

For those that don't know what equation we're talking about:

P1 / T1 = P2 / T2

It might be easier to visualize referenceing volume:

V1 / T1 = V2 / T2

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by neat:
<strong> Reducing timing will reduce lag because the exhaust gasses are hotter when they leave the head. This causes faster spool cause the exhaust has retained more energy, so it has more energy to impart to the turbine. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I'm a little confused here. Running less timing would cause the exhaust to retain more heat? Running less timing would cause you to lose HP. Meaning that the revving of the motor would take longer. Exhaust pulses are what drives the turbos. The quicker you can raise the number of pulses for a given time the faster your boost will rise. Now you don't want to raise the timing so much that you detonate. In fact play it safe.

However if you feel your motor can take it and you feel your turbos can deliver the volume of air required...I would run more boost and less timing in order to stay away from detonation yet keep pump as much air into the motor as I could. Unless of course you can't hook the car with that much HP. Then I would lower boost and add some timing.

 

Must work different in a DSM, because the tuning strategy used by them, and for all three of mine, was to add as much timing as possible down low to get the turbo to spool as fast as possible. It works great. My PMS system with 720cc (86lb) injectors allowed me to turn up the timing. The T04E/T-50/T3HF turbo was a BIT laggy on a 2.0L, but the timing knocked off 1000RPM on spool.

Remember, we're not talking about total timing. It's the low RPM timing the makes the engine wake up quicker. The steeper the ramp to full timing, the quicker the engine revs, and the turbo spools.

You are correct Chasgiv.

I guess Chevys are just backwards.

SC-

 

Expanding exhaust pulses exiting the cylinders are what drives the turbo. The reason they expand is due to the heat generated during combustion.

More cylinders means more pulses within a revolution. More revolutions within a given period of time means (again) more pulses.

If the exhuast pulses are allowed to cool they will lose their expansion and thus their volume. Volume is required to fill the exhaust manifold and move the turbing section.