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Would i see a big difference with adding 4lb lower? and would i have to run 100 octane all the time i have 17lb now with 2.4 kenniebell
I still have no clue how Cobra owners have belt slip.
So many friggin idlers, stub idlers etc.
I made 26 psi with one belt tensioner and one aux.idler with no slip on the Marauder.
Confused!
What upper are you running now?
You need to find the right combination for the boost you are looking for. By changing the lower you are increasing the boost and yes, you most likely will have to run 100 Octane or more, but what you could do is buy a bigger upper to reduce the boost back down for a 93 octane tune. You can then have your tuner supply a 93 octane tune on the bigger upper pulley and the 100 octane for the track with the smaller upper.
I still have no clue how Cobra owners have belt slip.
So many friggin idlers, stub idlers etc.
I made 26 psi with one belt tensioner and one aux.idler with no slip on the Marauder.
Confused!
What upper are you running now?
You need to find the right combination for the boost you are looking for. By changing the lower you are increasing the boost and yes, you most likely will have to run 100 Octane or more, but what you could do is buy a bigger upper to reduce the boost back down for a 93 octane tune. You can then have your tuner supply a 93 octane tune on the bigger upper pulley and the 100 octane for the track with the smaller upper.
i dont see why people are affraid of more boost on teh pump..
now im at the limit but anything less is not an issue at all
22-23 psi on pump 10k miles and 100 or more passes..still kickin ass:headbang: even through the 6-7 straight weeks of 90-100* and very high humidity summer days in Va for 4 yrs
got a 104 tune with more timing but ive never used it
I would never suggest to anybody to run pump gas and 20+ psi. Most people don't watch or understand enough about what's going on with their combo/tune to keep their motors alive at those boost levels on pump gas. Too many variables that could result in a fried motor. And I would hardly call 10k miles "longevity" since many people could put that many miles their cars in a year (myself included).
In the limited experience I've seen locally, every car that spun 20+ psi on their twin-screws and lived a long life, enhanced their octane in one way or another (meth, torco, race fuel, etc.). Several people who didn't all wound up doing engine builds. Coincidence....perhaps.
Allan,
If I remember correctly from some track visits you posted about last year, you still haven't gotten the current combo to really perform the way it should. If it was me I might work to get all the bugs ironed out before thowing a few more pounds of boost at it. Also, I seem to remember those 2.4 KB's being real "heat pumps" when your really start spinning them hard. SVTDubs blower used to heat soak badly when he really started turning up the boost on it.
Aren't you already running like 20 psi on it?
I would never suggest to anybody to run pump gas and 20+ psi. Most people don't watch or understand enough about what's going on with their combo/tune to keep their motors alive at those boost levels on pump gas. Too many variables that could result in a fried motor. And I would hardly call 10k miles "longevity" since many people could put that many miles their cars in a year (myself included).
In the limited experience I've seen locally, every car that spun 20+ psi on their twin-screws and lived a long life, enhanced their octane in one way or another (meth, torco, race fuel, etc.). Several people who didn't all wound up doing engine builds. Coincidence....perhaps.
Go to ModFords and look through the thread entitled Summary of Blown Engines http://www.modularfords.com/forums/showthread.php?t=12489&highlight=summary+blown&page=31 and draw your own conclusions. A post by Edmisten1 on the last page (page 31) sums up my own feelings on the subject pretty well:
Not to keep kicking a dead horse, but I just went over all 31 pages of this thread and looked at the what octane fuel was being ran at the time of failure.
91 octane: 7 instances (I know...hard to believe someone actually beat on a car like this with 91 octane fuel but it's documented here)
92 octane: 3 instances
93 octane: 32 instances
94 octane: 3 instances
100 octane: 1 instance (BadCobra logged this using 200 shot N20 as well)
Dgussin1 listed 17-18 psi street tune w/ 91 octane and 18* advance; 19-20 psi race tune w/ 100 octane and 20+* advance; he does not mention what tuneup he was running when it let go.
Although I did not count psi or timing advance at time of failure, just glacing at it, it's clear 15-16 psi with 19* timing advance is probaby a fair average. IMO, well above the reasonable limitations of what unleaded pump gas is capable of sustaining.
On page 23, ITSTOCK says "The way to avoid catastrophe is by using the right octane and not doing 170 mph top end runs".
What else really needs to be said? Upwards of 20 lbs of boost with a PD blower that creates a trememdous amount of heat with timing nearing 20* is asking ALOT for unleaded, pump gas...of any octane rating. Of course there are some failures where fuel probably didn't play a part. But at some point, you either build a race car and put race gas in it OR you build a street car and put pump gas in it. IMO and in my experience, you are flirting with disaster when you build a race car and put pump gas in it. Can all these failures be a coincidence? Subjecting these cars to numerous 40-140 highway pulls, 1/4 mile passes and the daily beatings we put them through given the data presented here begs the question: how much can you really expect from pump fuel? I'm not so naieve as to think high dollar, high octane fuel like VP Red, C12, or even C16 will prevent every motor from grenading or holing a piston, but how many would it have saved and how many will it save knowing this....?
Allan,
If I remember correctly from some track visits you posted about last year, you still haven't gotten the current combo to really perform the way it should. If it was me I might work to get all the bugs ironed out before thowing a few more pounds of boost at it. Also, I seem to remember those 2.4 KB's being real "heat pumps" when your really start spinning them hard. SVTDubs blower used to heat soak badly when he really started turning up the boost on it.
Aren't you already running like 20 psi on it?
I have 17 psi now . There were alot of bugs in the car with either alot of belt slip issues or blower problems. I got all belt slip issues resolved and had blower sent off to kennie bell for complete rebuild. Had new 02s sensors installed new aux idler custom bracket from deans performance fixed belt problem. Kennie bell found blower needed new seals and front drive rebuilt thats what i get from buying a used blower. And when car was tuned had 1 good o2 sensor and belt slip issues and a leaking kennie bell. So now car after 4lb lower should get a nice retune. I Shouldnt have any other issues besides the IRS hopping around at the track
Most tuners won't... because you will get the blame when some yahoo bumps the timing up with the boost but leaves the 93 octane tune. How long would those tuners be in business, think about it? With the interwebz word travels fast that xyz tuning keeps blowing motors up...
that being said, maybe you're right, maybe low timing on high boost is the secret for 93 octane tune, but no one around here has had the cajones to do it :lmao: I'd be curious to run my car against yours at the track and see how they perform on the same day with your 93 low timing and my 100 octane higher timing. 3rd gear will not lie in the 1/4 Do you know how many degrees of timing are in your 93 tune? What's your upper/lower combo? In my experience, warmer days bring lower boost/ heat soak, maybe you've been lucky and in reality the car is not making the boost you think it is and the car is actually pulling timing and you don't realize it. I just don't know if would gamble like that on a cool fall/ winter day around here. Only way to truley know would be to datalog it... I for one, would love too and see what really is going on in there. :biggthump
IMHO, belt slip issues on 03/04 cobras are highly overrated and usually a result of people running the wrong belt size.
Good to hear....sounds like you certainly had a bunch of issues holding you back before that you've rectified.I have 17 psi now . There were alot of bugs in the car with either alot of belt slip issues or blower problems. I got all belt slip issues resolved and had blower sent off to kennie bell for complete rebuild. Had new 02s sensors installed new aux idler custom bracket from deans performance fixed belt problem. Kennie bell found blower needed new seals and front drive rebuilt thats what i get from buying a used blower. And when car was tuned had 1 good o2 sensor and belt slip issues and a leaking kennie bell. So now car after 4lb lower should get a nice retune. I Shouldnt have any other issues besides the IRS hopping around at the track
Listen little brother.....Forget about more boost. You dont need it.
Now that you have all the bugs figured out JUST learn to master what you have. Your car needs nothing now other than for you to take it to the track and PRACTICE, PRACTICE, PRACTICE!!
After you master what you have THEN worry about adding more boost.
:biggthump
Listen little brother.....Forget about more boost. You dont need it.
Now that you have all the bugs figured out JUST learn to master what you have. Your car needs nothing now other than for you to take it to the track and PRACTICE, PRACTICE, PRACTICE!!
After you master what you have THEN worry about adding more boost.
:biggthump