When do I need polyurethane couplings?
Thread Starter
Instructor
Joined: Jun 2010
Posts: 133
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From: OOB ME
When do I need polyurethane couplings?
I just put on a a&a charger kit at 8psi and cam longtubes ls6 intake .. Car will be getting dyno maybe next weekend I'm hoping between 500-550rwhp.. I have bought a stage 6 transmission with triple disk converter. All from rpm. My question is should I buy new ones fromrpm when I swap in trans or will sock ones work? I don't care eith way but I don't know if stock will be fine or that will be limit for them. Anyone care to take a stab at this?
Predictions of how much she should make anyone??
.581 .588 220 228 116+3 lsa
a&a @8psi
longtubes gull exhaust
ls6 manifold
built trans and converter
3.15 rear gears
maf tune
Predictions of how much she should make anyone??
.581 .588 220 228 116+3 lsa
a&a @8psi
longtubes gull exhaust
ls6 manifold
built trans and converter
3.15 rear gears
maf tune
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
I would do the coulpings while you have the trans out if you have the extra cash.
And I have to ask why your doing the maf tune since it'll max out ~500rwhp.
And with your setup you better be north of 600rwhp and spray meth.
And I have to ask why your doing the maf tune since it'll max out ~500rwhp.
And with your setup you better be north of 600rwhp and spray meth.
Thread Starter
Instructor
Joined: Jun 2010
Posts: 133
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From: OOB ME
Is there a reason why it will max out at 500 rwhp on the maf tune... I guess that I am going with a maf tune because I don't kno much about speed density tunes first of all.. Secondly I like in maine at sea level literally on the ocean so I want to make sire if I drive it into the mountains to fool around I can and won't have worry about tuning issues. And I want this to be a complete daily driver and don't want to keep having to buy meth online as where I live it is not redialy available. If I want to go for a 500 mile drive I want to just get in and not having to bring extra meth (that's the main reason).. My buddys roush had meth and when he's out he can't drive it so that isn't appealing to me..
Why is maf tune good for 500 rwhp?
Why is speed denisty tune so much better?
My main goal is to get into the car and drive it wherever I wanna
Why is maf tune good for 500 rwhp?
Why is speed denisty tune so much better?
My main goal is to get into the car and drive it wherever I wanna
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
I would upgrade while you have the tranny out, much easier that way.
Your MAF is limited in how much airflow it can relay on to the PCM. The amount of air needed to make (using 500rwhp as a round number) could be all the airflow the MAF can relay due to voltage limits of the MAF. So once the airflow reaches the max flow for the MAF, it doesn't really do anything to adjust the PCM from that point up in HP. That is when you add fuel based on rpm.
There is a thread in this section that goes a little more into the MAF/ SD tuning debate. My car is SD tuned and I'll never go back to a MAF tune....
Your MAF is limited in how much airflow it can relay on to the PCM. The amount of air needed to make (using 500rwhp as a round number) could be all the airflow the MAF can relay due to voltage limits of the MAF. So once the airflow reaches the max flow for the MAF, it doesn't really do anything to adjust the PCM from that point up in HP. That is when you add fuel based on rpm.
There is a thread in this section that goes a little more into the MAF/ SD tuning debate. My car is SD tuned and I'll never go back to a MAF tune....
Last edited by Mike04; Jan 6, 2011 at 02:35 PM.
Thread Starter
Instructor
Joined: Jun 2010
Posts: 133
Likes: 0
From: OOB ME
That's very good input straight forward and to the point.. How come its such a huge difference in price between the two?
And as for the couplings I will be ordering them thanks again guys
And as for the couplings I will be ordering them thanks again guys
Safety Car
Joined: Apr 2000
Posts: 4,326
Likes: 140
From: Weatherford, TX
I'm running a MAF tune and stock GM couplers, thru A4 for 2 years over 650rwhp. I go more by the rule of don't fix what aint broke. After 2 years I just pulled the torque tube and inspected the GM couplers, they were good as new. Haven't had a reason to update my MAF tune.
Burning Brakes
Joined: Nov 2006
Posts: 768
Likes: 25
From: Cape Cod
Is there a reason why it will max out at 500 rwhp on the maf tune... I guess that I am going with a maf tune because I don't kno much about speed density tunes first of all.. Secondly I like in maine at sea level literally on the ocean so I want to make sire if I drive it into the mountains to fool around I can and won't have worry about tuning issues. And I want this to be a complete daily driver and don't want to keep having to buy meth online as where I live it is not redialy available. If I want to go for a 500 mile drive I want to just get in and not having to bring extra meth (that's the main reason).. My buddys roush had meth and when he's out he can't drive it so that isn't appealing to me..
Why is maf tune good for 500 rwhp?
Why is speed denisty tune so much better?
My main goal is to get into the car and drive it wherever I wanna
Why is maf tune good for 500 rwhp?
Why is speed denisty tune so much better?
My main goal is to get into the car and drive it wherever I wanna
I think that clears things up a bit
Thread Starter
Instructor
Joined: Jun 2010
Posts: 133
Likes: 0
From: OOB ME
Alright thanks seems there is a lot of discussion and opposing views between maf and sd tunes. I will be going with a maf as of now.. Numbers will be in next week with what it makes without meth... Not running meth what would you guys think would be a good a/f ratio to be safe
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Safety Car
Joined: Apr 2000
Posts: 4,326
Likes: 140
From: Weatherford, TX
A/F about 11.5:1 is in the ballpark. Here's one scenario (as I understand it). Let's say you do a SD tune for 20psi and make 1000rwhp. Then you realize you can't plant the power on the street, and turn down the boost to 10psi. The SD tune will adapt the fueling and maintain proper AFR.
With a MAF tune, the airflow range of the sensor is maxed out somewhere over 500rwhp. The upper RPM fueling curve is hard coded to RPM, so it doesn't adapt if the boost goes up/down. So if you do a MAF tune for 20psi then switch to 10psi, it goes rich.
With a MAF tune, the airflow range of the sensor is maxed out somewhere over 500rwhp. The upper RPM fueling curve is hard coded to RPM, so it doesn't adapt if the boost goes up/down. So if you do a MAF tune for 20psi then switch to 10psi, it goes rich.
