AC CR43TS or AC CR42TS ?
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i wouldn't be too worried about the maf #'s from those runs.they aren't anything we're going to try to duplicate
.they do tell us something,mainly that your car was flowing the most air when your mixture was richer.the leaner you got,the more kr you had and the less air your engine flowed.
we're gonna try to get away from that
.
later,sean
.they do tell us something,mainly that your car was flowing the most air when your mixture was richer.the leaner you got,the more kr you had and the less air your engine flowed.we're gonna try to get away from that
.later,sean
On a hotair motor with a 20* chip, start out with about 15 or 16# of boost and see what you've got...I'd bet you'll run just as fast there as you did when you tried to run more boost...
1. set FP to about 43#
2. set boost to about 16#
3. Make a pass
4. see what kind of KR you are getting...
5.TUNE FOR NO KNOCK!!!
6. oh yeah,TUNE FOR NO KNOCK!!!
7. and did I forget to mention,TUNE FOR NO KNOCK!!!
If you are getting any knock, then your tune is wrong...Retune(yep, you guessed it), FOR NO KNOCK!!! Check your O2 readings, with pump gas, don't go below 800...keep it in the 800-820 range...With race gas, you can go a bit lower, like 780 or so, but with pump gas, no lower than 800...If your O2's are lower than 800 and your only at 16# of boost, then up the FP about 2# and make another pass W/O changing anything else and see what happens...Your O2's should come up a little...If you are now at 800 or above(with NO KNOCK ), then increase your boost by 1# and make another pass...Don't change anything else...See what you get...Check O2s and KR...If you are below 800 and have some KR then increase the FP and don't change anything else...Make another pass...See what you get...If you now have O2s around 800 and no KR, then keep up with the pattern I've described...If you are still getting KR and O2s won't go up to between 800-820, then you've hit the max limit for pump gas and your 20* chip...You won't get any more out of it with straight pump gas...Stick a fork in it, your done...Once you've found out the max limit, then back all your settings to the point where you got no KR and have the max amount of boost at that FP setting...
Unless you put a higher octane fuel in there, you WILL NOT be able to run any more boost on a hotair car nowdays, because the fuel today is worse than it was 10 yrs ago...Hell, I think the stock chip was like 22*, but the gas was better back in the mid 80's...
Sorry for being long winded, but basically, that is how you tune these cars...
1. set FP to about 43#
2. set boost to about 16#
3. Make a pass
4. see what kind of KR you are getting...
5.TUNE FOR NO KNOCK!!!
6. oh yeah,TUNE FOR NO KNOCK!!!
7. and did I forget to mention,TUNE FOR NO KNOCK!!!
If you are getting any knock, then your tune is wrong...Retune(yep, you guessed it), FOR NO KNOCK!!! Check your O2 readings, with pump gas, don't go below 800...keep it in the 800-820 range...With race gas, you can go a bit lower, like 780 or so, but with pump gas, no lower than 800...If your O2's are lower than 800 and your only at 16# of boost, then up the FP about 2# and make another pass W/O changing anything else and see what happens...Your O2's should come up a little...If you are now at 800 or above(with NO KNOCK ), then increase your boost by 1# and make another pass...Don't change anything else...See what you get...Check O2s and KR...If you are below 800 and have some KR then increase the FP and don't change anything else...Make another pass...See what you get...If you now have O2s around 800 and no KR, then keep up with the pattern I've described...If you are still getting KR and O2s won't go up to between 800-820, then you've hit the max limit for pump gas and your 20* chip...You won't get any more out of it with straight pump gas...Stick a fork in it, your done...Once you've found out the max limit, then back all your settings to the point where you got no KR and have the max amount of boost at that FP setting...
Unless you put a higher octane fuel in there, you WILL NOT be able to run any more boost on a hotair car nowdays, because the fuel today is worse than it was 10 yrs ago...Hell, I think the stock chip was like 22*, but the gas was better back in the mid 80's...
Sorry for being long winded, but basically, that is how you tune these cars...
Thanks for all the replys.
I thought it was a decent thread about the spark plug topic, but it wound up being much more. The topic has turned to tuning, which is probably the one main thing that most of us hotair guys have been lacking. Weve all got good boltons and that is what everyone spends most of there time talking/asking about, but tuning is the single most important "mod" you could do.
Hopefully I can get my car to act differently with your suggestions, but more importantly, hopefully everyone wondering about tuning should be able to take something from this.
Please keep the suggestions and comments coming, if anyone has anything else to add. IF THERE IS ANY STICKY THAT WE SHOULD DEFINATELY HAVE IT IS ONE ON TUNING, THIS I THINK IS WHERE WE FALL BEHIND THE 86-87 GUYS THE MOST (IMO of course).
I thought it was a decent thread about the spark plug topic, but it wound up being much more. The topic has turned to tuning, which is probably the one main thing that most of us hotair guys have been lacking. Weve all got good boltons and that is what everyone spends most of there time talking/asking about, but tuning is the single most important "mod" you could do.
Hopefully I can get my car to act differently with your suggestions, but more importantly, hopefully everyone wondering about tuning should be able to take something from this.
Please keep the suggestions and comments coming, if anyone has anything else to add. IF THERE IS ANY STICKY THAT WE SHOULD DEFINATELY HAVE IT IS ONE ON TUNING, THIS I THINK IS WHERE WE FALL BEHIND THE 86-87 GUYS THE MOST (IMO of course).
That's just it, the tuning between the hotairs and the IC'd cars isn't that much different...The principles are the same...It's just that somewhere along the line, someone(a lot of someone's) had everyone convinced that it's different...It isn't...It's just the starting points are different, like fuel pressure starting points, boost levels, etc...But the same basic principles are the same...
The biggest problems are that the majority of the newer hotair owners think that bolt-ons are needed to "make their cars run better"...That is BS...Before any bolt-on's go on, you should get your car running the best that it can...A motor is a motor...If you have a mechanical problem already there, a bolt-on isn't going to fix it and the car will still run like crap...Max out the stock setup, then do the bolt-ons, but one at a time...When my car was all stock, it was running faster than a lot of some of the hotair owners here with more mods listed in their signature lines 10 times longer than than questions that post...
Heck, I could go on and on, but I already have in another post...Do a search on my "gotta rant" post a few months ago...
This is all I'm gonna say on this...
Now back to the topic...
I like my NGK UR5's...
The biggest problems are that the majority of the newer hotair owners think that bolt-ons are needed to "make their cars run better"...That is BS...Before any bolt-on's go on, you should get your car running the best that it can...A motor is a motor...If you have a mechanical problem already there, a bolt-on isn't going to fix it and the car will still run like crap...Max out the stock setup, then do the bolt-ons, but one at a time...When my car was all stock, it was running faster than a lot of some of the hotair owners here with more mods listed in their signature lines 10 times longer than than questions that post...
Heck, I could go on and on, but I already have in another post...Do a search on my "gotta rant" post a few months ago...
This is all I'm gonna say on this...
Now back to the topic...
I like my NGK UR5's...
Originally posted by FJM568
When my car was all stock, it was running faster than a lot of some of the hotair owners here with more mods listed in their signature lines 10 times longer than than questions that post...
Heck, I could go on and on, but I already have in another post...Do a search on my "gotta rant" post a few months ago...
This is all I'm gonna say on this...
Now back to the topic...
I like my NGK UR5's...
word
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