PE vs coolant temp (WOT)
Thread Starter
Burning Brakes
Joined: Sep 2000
Posts: 1,199
Likes: 1
From: NewCastle IN. USA
PE vs coolant temp (WOT)
ok I've got a tuning problem.
right now I need more PE above 5000rpm but I'm maxed out in the "PE vs RPM" (49% @ 6400rpm).
in order to get more fuel in the 5000 to 6400rpm range I'm thinking about raising the values in "PE vs coolant temp".
then IF that make ALL of PE richer I can lower the "PE vs RPM" below 5000rpm (or basically retune WOT with lower values) and have some more room at high RPM for adjusting.?
reason I'm asking is that I have changed heads (bigger) and retarded the cam some. the BLM's are still good and the only things it needs are alittle AE and this high RPM WOT deal.
I've already tried making everything richer (more fuel pressure) and retuning, but that throws the BLM's way out of wack.
yes? no? better idea?
right now I need more PE above 5000rpm but I'm maxed out in the "PE vs RPM" (49% @ 6400rpm).
in order to get more fuel in the 5000 to 6400rpm range I'm thinking about raising the values in "PE vs coolant temp".
then IF that make ALL of PE richer I can lower the "PE vs RPM" below 5000rpm (or basically retune WOT with lower values) and have some more room at high RPM for adjusting.?
reason I'm asking is that I have changed heads (bigger) and retarded the cam some. the BLM's are still good and the only things it needs are alittle AE and this high RPM WOT deal.
I've already tried making everything richer (more fuel pressure) and retuning, but that throws the BLM's way out of wack.
yes? no? better idea?
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by ol,RJ
ok I've got a tuning problem.
right now I need more PE above 5000rpm but I'm maxed out in the "PE vs RPM" (49% @ 6400rpm).
in order to get more fuel in the 5000 to 6400rpm range I'm thinking about raising the values in "PE vs coolant temp".
then IF that make ALL of PE richer I can lower the "PE vs RPM" below 5000rpm (or basically retune WOT with lower values) and have some more room at high RPM for adjusting.?
reason I'm asking is that I have changed heads (bigger) and retarded the cam some. the BLM's are still good and the only things it needs are alittle AE and this high RPM WOT deal.
I've already tried making everything richer (more fuel pressure) and retuning, but that throws the BLM's way out of wack.
yes? no? better idea?
right now I need more PE above 5000rpm but I'm maxed out in the "PE vs RPM" (49% @ 6400rpm).
in order to get more fuel in the 5000 to 6400rpm range I'm thinking about raising the values in "PE vs coolant temp".
then IF that make ALL of PE richer I can lower the "PE vs RPM" below 5000rpm (or basically retune WOT with lower values) and have some more room at high RPM for adjusting.?
reason I'm asking is that I have changed heads (bigger) and retarded the cam some. the BLM's are still good and the only things it needs are alittle AE and this high RPM WOT deal.
I've already tried making everything richer (more fuel pressure) and retuning, but that throws the BLM's way out of wack.
yes? no? better idea?
That will give you more fuel across the board while in PE. Then you can reduce the amount in the RPM ranges that don't require additional fueling. Its hard to beleive that you are still lean after maxing the constant out. Are you loosing fuel pressure at the upper RPMs? That is a more common cause of insufficient fuel than tuning. I have had three cars on my chassis dyno that ran out of fuel in the upper RPMs due to clogged fuel filters, and or faulty pumps.
Thread Starter
Burning Brakes
Joined: Sep 2000
Posts: 1,199
Likes: 1
From: NewCastle IN. USA
thanks tjwong,
I was thinking it would work that way.
fuel system is fine, the old combo made 416rwhp @ 6200rpm (rev limit of 6600rpm) this combo looks like it will make a "little" bit more and wind out farther (probably limit it to 6800rpm, depends on what the dyno shows).
thats the main problem, I'm sure I have enough to adjust it in up to maybe 6000rpm, it just that last bit that will be a problem (would be nice to have a bit of room there just incase).
it really doesn't need much, another .050mv on O2 sensor should do it (narrow band O2 for now, I'll do a wideband on a dyno later).
right now I have the injector constant at 35lbs (running 30lb injectors) I think that has alot to do with why its so close to the max in PE. its tough to get it lean enough at low rpm's and still turn high rev's (and not go crazy with the inj. duty cycle).
RJ
I was thinking it would work that way.
fuel system is fine, the old combo made 416rwhp @ 6200rpm (rev limit of 6600rpm) this combo looks like it will make a "little" bit more and wind out farther (probably limit it to 6800rpm, depends on what the dyno shows).
thats the main problem, I'm sure I have enough to adjust it in up to maybe 6000rpm, it just that last bit that will be a problem (would be nice to have a bit of room there just incase).
it really doesn't need much, another .050mv on O2 sensor should do it (narrow band O2 for now, I'll do a wideband on a dyno later).
right now I have the injector constant at 35lbs (running 30lb injectors) I think that has alot to do with why its so close to the max in PE. its tough to get it lean enough at low rpm's and still turn high rev's (and not go crazy with the inj. duty cycle).
RJ
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by ol,RJ
thanks tjwong,
I was thinking it would work that way.
fuel system is fine, the old combo made 416rwhp @ 6200rpm (rev limit of 6600rpm) this combo looks like it will make a "little" bit more and wind out farther (probably limit it to 6800rpm, depends on what the dyno shows).
thats the main problem, I'm sure I have enough to adjust it in up to maybe 6000rpm, it just that last bit that will be a problem (would be nice to have a bit of room there just incase).
it really doesn't need much, another .050mv on O2 sensor should do it (narrow band O2 for now, I'll do a wideband on a dyno later).
right now I have the injector constant at 35lbs (running 30lb injectors) I think that has alot to do with why its so close to the max in PE. its tough to get it lean enough at low rpm's and still turn high rev's (and not go crazy with the inj. duty cycle).
RJ
I was thinking it would work that way.
fuel system is fine, the old combo made 416rwhp @ 6200rpm (rev limit of 6600rpm) this combo looks like it will make a "little" bit more and wind out farther (probably limit it to 6800rpm, depends on what the dyno shows).
thats the main problem, I'm sure I have enough to adjust it in up to maybe 6000rpm, it just that last bit that will be a problem (would be nice to have a bit of room there just incase).
it really doesn't need much, another .050mv on O2 sensor should do it (narrow band O2 for now, I'll do a wideband on a dyno later).
right now I have the injector constant at 35lbs (running 30lb injectors) I think that has alot to do with why its so close to the max in PE. its tough to get it lean enough at low rpm's and still turn high rev's (and not go crazy with the inj. duty cycle).
RJ
to the ECM to let it think its got larger injectors to get the AFR you need down low. Changing the temperature constant should do the trick. Or swap back to smaller injectors such as 24's or 28's from a LT4. Or go for the cheap LS1 injectors which work out to be around 25.Just be aware that with a narrow band sensor, anything over 450mV can be construed as rich, even at 800mV which is rich one really doesn't know how rich it really is. It can be 13.5:1 or 14:1. Narrow band sensors are accurate at its very narrow operating range, anything beyond that is anyones guess. A good wide band that is also very economical is the Innovate Motorsports LM1. It works very well, and also datalogs.
Thread Starter
Burning Brakes
Joined: Sep 2000
Posts: 1,199
Likes: 1
From: NewCastle IN. USA
you got it.
I guess I should have mentioned that it was a 165 ecm.
right now the pulse widths are in the 7 - 9.8 millisecond range at WOT, think I'll keep trying the 30lb injectors for now (got a lot of time in this tune for driveabilty, or a whole lot of lie's told to the ecm anyway).
maybe one of these day's I'll spring for a wideband O2.
I guess I should have mentioned that it was a 165 ecm.
right now the pulse widths are in the 7 - 9.8 millisecond range at WOT, think I'll keep trying the 30lb injectors for now (got a lot of time in this tune for driveabilty, or a whole lot of lie's told to the ecm anyway).
maybe one of these day's I'll spring for a wideband O2.
