Pettit RX8 going to NASA Time Trial
07-05-2010, 03:49 PM
#51
I guess it is all across the board Dondo. Rick E/Paul told me with my build --no higher than 8.3 if i want my engine to last a while (hopefully some years).
Some Pettit guys go to 9K , some to 8.3 or so. Hell guess it sounds like i am trying to turn mine into a diesel.
The blower can take it and continue to produce boost---np.
Oh by the way i dont tune--
Jeff what type of rev cut is it--fuel or spark?
By rev cut i mean the engine is limited to a particular rpm--after that rpm the revs are "cut".
old drag racing term.
Does look like i may need a Cobb, Paul-- wish someone was around with a commercial license.
OD
Some Pettit guys go to 9K , some to 8.3 or so. Hell guess it sounds like i am trying to turn mine into a diesel.
The blower can take it and continue to produce boost---np.
Oh by the way i dont tune--
Jeff what type of rev cut is it--fuel or spark?
By rev cut i mean the engine is limited to a particular rpm--after that rpm the revs are "cut".
old drag racing term.
Does look like i may need a Cobb, Paul-- wish someone was around with a commercial license.
OD
Last edited by olddragger; 07-05-2010 at 03:52 PM.
07-05-2010, 08:22 PM
#53
Thanks Paul--appreciate it.
Well the ecu may cut fuel but i would still be spraying water---(cant use methanol)----???
this is getting complicated.
I need to just dyno the damn thing till redline then drive it the way i want. i will not be running away from any competition out there (some serious cars and drivers) and i dont plan on going to nationals--so no one in their right mind would challenge my car.
Jeez
OD
Well the ecu may cut fuel but i would still be spraying water---(cant use methanol)----???
this is getting complicated.
I need to just dyno the damn thing till redline then drive it the way i want. i will not be running away from any competition out there (some serious cars and drivers) and i dont plan on going to nationals--so no one in their right mind would challenge my car.
Jeez
OD
07-05-2010, 08:48 PM
#54
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i bet it wont matter... when you hit the fuel cut, rpms drop quickly and you get fuel delivery again.. unless you were pumping gallons of water, your not gonna have enough vapor to matter for anything. besides, i dont see you riding the cut off point anyway... you may hit it once, but you'll be changing gear/decelerating/braking whatever ya know 
it'd be complicated but you could always consider controlling spray with the PWM for the fuel injectors, not directly but via a lil logic circuit. aka, spray gets tied to fuel delivery not MAF
it'd be complicated but you could always consider controlling spray with the PWM for the fuel injectors, not directly but via a lil logic circuit. aka, spray gets tied to fuel delivery not MAF
Last edited by paulmasoner; 07-05-2010 at 08:54 PM.
07-05-2010, 10:40 PM
#55
Phill is set to 10k. I think Heroic is set to 9200.
Most are at 9000.
We've seen it all before. We know how these subsystems work and we've detailed it all over and over again over the last several years.
Last edited by MazdaManiac; 07-05-2010 at 10:42 PM.
07-06-2010, 10:44 AM
#57
thanks Bret that does help me feel a little better. Just cutting the tb back is good.
Jeff--- what are you posting about? Dont understand-- been there , done that, I am all alone thing?
OK -so I am off to Balanced performance toward the end of this month--- i will dyno to 9K
then use Rick/Pauls suggested redline in driving. I also will get an official weight and have them corner balance the car.
I appreciate all the help with my stupid questions.
OD
Jeff--- what are you posting about? Dont understand-- been there , done that, I am all alone thing?
OK -so I am off to Balanced performance toward the end of this month--- i will dyno to 9K
then use Rick/Pauls suggested redline in driving. I also will get an official weight and have them corner balance the car.
I appreciate all the help with my stupid questions.
OD
07-06-2010, 11:03 AM
#58
You seem habitually driven to "wonder" aloud about subjects that already have a massive amount of coverage and then proceed to experiment as if none of the pre-existing data is available to you, even though your "audience" is constantly presenting you with that data.
Even more frustrating are the often false "conclusions" you present after this experimentation, which requires yet another exposition of the previously-existing data and results just to keep the discussion from being derailed even further.
It's like stumbling into an active meeting of landscapers and loudly interrupting the discussion with the question: "Have any of you ever considered fertilizer?"
07-06-2010, 07:33 PM
#60
All I am suggesting is that you consider the help that is given and include that data in your analysis, rather than pretending you live in a bubble.
More importantly, you will never see me or anyone I associate with discarding useful data just because of its source (or blindly accepting data for the same reason).
If you have an idea and there is information that makes the idea seem invalid, at least ponder why that data exists before you go on experimenting as if it didn't.
07-06-2010, 09:01 PM
#61
before labeling i was verifying. That is what is meant by "Sounds like".
If I am a pain in the *** and didnt do my homework then all someone needs to do is to tell me.
I cant read minds.
All the questions i ask is because I dont know or i am not sure of.
If you are speaking of the redline question--its not in the rules and Greg which Greg acknowledged and addressed the issue by saying they can control how the car is dynoed. Fair enough. You never offered that.
I will never discard useful data if i know its useful. True, sometimes i may have an idea for a different approach to whatever has been tried and didnt work. For example you mentioned Motor mounts. When i 1st started posting about MM you posted about how my idea wouldnt work because you already had experience with some prepared in a distant similar manner that failed. I persisted and i found a way to make them work and to keep the oem break a way mostly intact. I persist if I believe there is a way.
Perhaps its that i dont except things just because someone said so. I need to understand how they developed their beliefs. Kinda reminds me they way you were when people were inquiring about ignition dwell times and you refused to share because you wanted people to go through the process of finding out for themselves. Your belief was you wanted people to be able to solve the problem themselves.
you know still, all this and i still dont know wth we are talking about.
OD out
If I am a pain in the *** and didnt do my homework then all someone needs to do is to tell me.
I cant read minds.
All the questions i ask is because I dont know or i am not sure of.
If you are speaking of the redline question--its not in the rules and Greg which Greg acknowledged and addressed the issue by saying they can control how the car is dynoed. Fair enough. You never offered that.
I will never discard useful data if i know its useful. True, sometimes i may have an idea for a different approach to whatever has been tried and didnt work. For example you mentioned Motor mounts. When i 1st started posting about MM you posted about how my idea wouldnt work because you already had experience with some prepared in a distant similar manner that failed. I persisted and i found a way to make them work and to keep the oem break a way mostly intact. I persist if I believe there is a way.
Perhaps its that i dont except things just because someone said so. I need to understand how they developed their beliefs. Kinda reminds me they way you were when people were inquiring about ignition dwell times and you refused to share because you wanted people to go through the process of finding out for themselves. Your belief was you wanted people to be able to solve the problem themselves.
you know still, all this and i still dont know wth we are talking about.
OD out
Last edited by olddragger; 07-07-2010 at 07:29 AM.
07-07-2010, 03:35 PM
#62
well --its over.
My car weight is too light.
I weigh approx 3260 with gas and driver
Thats means that i could not have anymore than 318 hp. I THINK i am more than that.
I am still going to dyno at the end of the month--you never know.
But with max power to wgt of 10.25/1 --it doesnt look encouraging
No I am not adding a subwoofer and I am not going on the Macdonald diet.
crap.
My car weight is too light.
I weigh approx 3260 with gas and driver
Thats means that i could not have anymore than 318 hp. I THINK i am more than that.
I am still going to dyno at the end of the month--you never know.
But with max power to wgt of 10.25/1 --it doesnt look encouraging
No I am not adding a subwoofer and I am not going on the Macdonald diet.
crap.
07-07-2010, 03:50 PM
#64
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well --its over.
My car weight is too light.
I weigh approx 3260 with gas and driver
Thats means that i could not have anymore than 318 hp. I THINK i am more than that.
I am still going to dyno at the end of the month--you never know.
But with max power to wgt of 10.25/1 --it doesnt look encouraging
No I am not adding a subwoofer and I am not going on the Macdonald diet.
crap.
My car weight is too light.
I weigh approx 3260 with gas and driver
Thats means that i could not have anymore than 318 hp. I THINK i am more than that.
I am still going to dyno at the end of the month--you never know.
But with max power to wgt of 10.25/1 --it doesnt look encouraging
No I am not adding a subwoofer and I am not going on the Macdonald diet.
crap.
I thought being underweight was good?
I heard a Smokey Yunick style story from a racing buddy about a DSM they built for some race series. They built the car almost 200lb underweight, and then hid a 200lb ballast in a custom cheater fuel tank, as low and in the middle of the car as possible. They spanked everyone else in the series by a mile.
07-07-2010, 03:55 PM
#65
I thought being underweight was good?
I heard a Smokey Yunick style story from a racing buddy about a DSM they built for some race series. They built the car almost 200lb underweight, and then hid a 200lb ballast in a custom cheater fuel tank, as low and in the middle of the car as possible. They spanked everyone else in the series by a mile.
I heard a Smokey Yunick style story from a racing buddy about a DSM they built for some race series. They built the car almost 200lb underweight, and then hid a 200lb ballast in a custom cheater fuel tank, as low and in the middle of the car as possible. They spanked everyone else in the series by a mile.
07-07-2010, 08:22 PM
#68
nasa has a power/ wgt ratio that cannot be surpassed. TTB it is 10.25/1.
With 1/4 tank gas and me in the car i weigh approx 3260. Nasa uses a race wgt for this ratio. that defined is how much the car would wgt when you came off track after a session.
you cant use a full tank of gas--most is 1/4 (by word of mouth).
I believe MM you have the leather interior etc. i dont. i do have the touring model but no leather, power seats, nav etc. I havent added a subwoofer or anything of that nature.
At 3260 the most hp i could have is 318 hp. At 330 hp i would have to wgt is at 3380lbs.
That would be 120lbs of ballast.
I dont know how your organization class's cars MM.
Adding ballast on a DD car is not that simple for me but if it is under 100lbs --sure, i could do that.
Nasa also has strict rules about how ballast can be added.
OD
Dyno 1st and see what i have--then it will be decision time.
last week in july is the time.
With 1/4 tank gas and me in the car i weigh approx 3260. Nasa uses a race wgt for this ratio. that defined is how much the car would wgt when you came off track after a session.
you cant use a full tank of gas--most is 1/4 (by word of mouth).
I believe MM you have the leather interior etc. i dont. i do have the touring model but no leather, power seats, nav etc. I havent added a subwoofer or anything of that nature.
At 3260 the most hp i could have is 318 hp. At 330 hp i would have to wgt is at 3380lbs.
That would be 120lbs of ballast.
I dont know how your organization class's cars MM.
Adding ballast on a DD car is not that simple for me but if it is under 100lbs --sure, i could do that.
Nasa also has strict rules about how ballast can be added.
OD
Dyno 1st and see what i have--then it will be decision time.
last week in july is the time.
07-08-2010, 07:24 AM
#70
07-08-2010, 07:55 AM
#71
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just ballast it, depending on regs that could allow you to have the same ratio as any other option, but allows you to place your weight where you want it... IF regs allow
OT - hey G, things are not looking good for the match sunday if you come up
OT - hey G, things are not looking good for the match sunday if you come up
07-08-2010, 09:31 AM
#73
no, TTB.
Please enlighten me if I am missing something?
TTC, if I remember correctly, has a approx 12/1 ratio.
I understand that Greg will class the car according to dyno in which h/p and TQ is recognized. Also the weight of the car plus all the other points stuff.
There are certain allowances listed such as a 4 door car gets a break (they will not classify ours as a 4 door), but i dont recognize any that i can use.
That is how the rules read to me, but Greg does the decision making.
OD
Please enlighten me if I am missing something?
TTC, if I remember correctly, has a approx 12/1 ratio.
I understand that Greg will class the car according to dyno in which h/p and TQ is recognized. Also the weight of the car plus all the other points stuff.
There are certain allowances listed such as a 4 door car gets a break (they will not classify ours as a 4 door), but i dont recognize any that i can use.
That is how the rules read to me, but Greg does the decision making.
OD
07-09-2010, 08:50 AM
#75
I have a thought and wondered what other think that may solve my "problem".
What if i just disconnect the apv's? I would run pig rich but maf readings suggest a sub 300 hp level? I got 325 at 7.7K--ambient temp was high at 99F, w/m injecting water only.
Is there any problems doing that?
OD
What if i just disconnect the apv's? I would run pig rich but maf readings suggest a sub 300 hp level? I got 325 at 7.7K--ambient temp was high at 99F, w/m injecting water only.
Is there any problems doing that?
OD