7.3 @ 95 w/stock 317's, LQ9, and TSP Tsunami, what next (on a budget)?
06-07-2011, 09:25 AM
#1
7.3 @ 95 w/stock 317's, LQ9, and TSP Tsunami, what next (on a budget)? Car went 7.3 in the 1/8th with a crappy 1.8 60' (on et streets). It's a Mustang Coupe with a th350, 4400 stall, 3.73's, 28in et streets, long tubes, ls6 intake, lq9, stock 317's, and a tsp tsunami cam with tsp pushrods.
I really think the car can do a 6.99 the way it sits, but this was the first time out and I ended up finding out I had some funky air pressure in my slicks (bad pressure gauge, one slick was around 15psi the other over 20psi causing the car to spin for 30-60ft).
Anyways, what would be your next step considering that I am on a very tight budget?
I really think the car can do a 6.99 the way it sits, but this was the first time out and I ended up finding out I had some funky air pressure in my slicks (bad pressure gauge, one slick was around 15psi the other over 20psi causing the car to spin for 30-60ft).
Anyways, what would be your next step considering that I am on a very tight budget?
06-07-2011, 09:37 AM
#2
I would try and dump the 317s and pick up some 243 casting heads. Out of the box they should pick you up some noticeable power because you will get a healthy bump in compression. If its in the budget to get them ported I would do so because they can pick up some pretty decent power for a stock casting head.
06-07-2011, 04:00 PM
#5
You don't lose any clearance by going to a 243 head. It just has a smaller chamber. You could mill the 317s but I don't think you would be able to get them down to a 64cc chamber and still have any clearance. That would be a .050" mill which is pretty aggressive with that cam spec you have. I am not sure what the going rate on stock castings LS6s is right now.
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06-07-2011, 10:40 PM
#8
great ETs for the combo.you can sell the 317s to some one going boosted .or mill them and get a smaller cam.if you want to keep your current cam get some 243/799 heads.if you can afford it consider some TSP PRC st 1 ls6 heads.what intake/injectors/TB do you have?
06-08-2011, 03:41 AM
#9
You don't lose any clearance by going to a 243 head. It just has a smaller chamber. You could mill the 317s but I don't think you would be able to get them down to a 64cc chamber and still have any clearance. That would be a .050" mill which is pretty aggressive with that cam spec you have. I am not sure what the going rate on stock castings LS6s is right now.
Also, I think that it's 0.006 of milling per cc. So, to drop the chamber size of the stock 317s from 70cc to 64cc, he will need to mill them 0.036. With 64cc for chamber size and stock head gasket, I don't think the Tsunami cam will have any PTV clearance issues.
Just my .02 and please correct me if I'm wrong.
Last edited by Samer; 06-08-2011 at 03:49 AM.
06-08-2011, 03:47 AM
#10
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^^^you're misinformed there sir. TSP was dead on the money. 317s are around 72cc. 50 thousandths is a lot to mill off a set of heads, possibly causing intake alignment issues and PTV clearance issues. A set of 243s gives you 64cc chambers but keeping stock alignment and PTV specs. THAT is why the nod goes to the 243 castings in this case.
06-08-2011, 08:10 AM
#12
My buddy has a coupe with an aggressive sbc and was going 6.9/7.0 and trapping 94mph.
My 1.8 60's were just not cutting it, I've only had the car out to the track the one time, it was 98* outside and I went on a "street night" so all the street tires were killing track prep (coupled with me not having a anti-roll bar). I figure if I could get my 60 foot down to a 1.6 or better and in a little better air the car has a 6.99 in it as it sits. I figure if I swap out for a better set of heads it'd go even faster.
I wasn't all too disappointed with my numbers considering the car has never been on a dyno (just tuned with a wideband on the street), but 6's on a junk yard motor just has a better ring to it!
Anyone got any input on what would be a reasonable price for a set of 243's (and what is the difference between them and 799's) and what is a reasonable price to sell my 317's (off a 70k mile 2005 escalade motor).
06-08-2011, 08:20 AM
#13
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It doesn't matter what brings the head down, the results are the same. The motor doesn't know if you achieved .050 by head gasket, milling, decking the block, or all 3. The end results is the head .050 closer to the block/pistons with the corresponding PTV clearance, intake alignment, and compression bump.
06-08-2011, 09:33 AM
#14
Just get it to hook, that should be very very close to 6.9.
Chrs1313 RAM sir would be my next move after figuring out your hooking issue. You don't need any tuning changes, easy install, cheap, proven gains.
If that doesnt do the trick then I would swap the 317s for either 243s or try to find a used 5.3 2.5 or stg1 ls6 head if budget allows. 243s run about 500, used ported heads run about 800. Extra 300$ to more or less guarantee your 6.9 mark.
Chrs1313 RAM sir would be my next move after figuring out your hooking issue. You don't need any tuning changes, easy install, cheap, proven gains.
If that doesnt do the trick then I would swap the 317s for either 243s or try to find a used 5.3 2.5 or stg1 ls6 head if budget allows. 243s run about 500, used ported heads run about 800. Extra 300$ to more or less guarantee your 6.9 mark.
06-08-2011, 10:19 AM
#17
Up to my knowledge, the 317 heads have the same casting of the 243 but with a bigger chamber. Milling them down to 64 will give you the same performance of 243 heads.
Also, I think that it's 0.006 of milling per cc. So, to drop the chamber size of the stock 317s from 70cc to 64cc, he will need to mill them 0.036. With 64cc for chamber size and stock head gasket, I don't think the Tsunami cam will have any PTV clearance issues.
Just my .02 and please correct me if I'm wrong.
Also, I think that it's 0.006 of milling per cc. So, to drop the chamber size of the stock 317s from 70cc to 64cc, he will need to mill them 0.036. With 64cc for chamber size and stock head gasket, I don't think the Tsunami cam will have any PTV clearance issues.
Just my .02 and please correct me if I'm wrong.
06-08-2011, 10:24 AM
#18
Just get it to hook, that should be very very close to 6.9.
Chrs1313 RAM sir would be my next move after figuring out your hooking issue. You don't need any tuning changes, easy install, cheap, proven gains.
If that doesnt do the trick then I would swap the 317s for either 243s or try to find a used 5.3 2.5 or stg1 ls6 head if budget allows. 243s run about 500, used ported heads run about 800. Extra 300$ to more or less guarantee your 6.9 mark.
Chrs1313 RAM sir would be my next move after figuring out your hooking issue. You don't need any tuning changes, easy install, cheap, proven gains.
If that doesnt do the trick then I would swap the 317s for either 243s or try to find a used 5.3 2.5 or stg1 ls6 head if budget allows. 243s run about 500, used ported heads run about 800. Extra 300$ to more or less guarantee your 6.9 mark.
So around $500 for some 243's then flip my 317's for 250 or so? What is the difference between the 243's and the 799's? Any idea how much e.t. the stock 243's would be worth vs. the 799's?
It is a custom built converter by Mikes Trickshift, he builds a lot of transmissions/converters for big hp cars out here. I had him build my th350 and this converter. It'll footbrake to about 3500rpm and flashes just over 4400. I am not sure what the DA was, this is in Dallas/Ft. Worth Texas so we are pretty close to sea level, but it was SUPER hot that day!
06-08-2011, 10:48 AM
#19
This motor is in a Mustang, so I wouldn't be able to use the Chrs1313 setup, as sad as it sound right now I am actually using a homemade intake tube that is just 3in PVC pipe that comes out of my intake elbow/maf and bring the filter over towards the drivers side of the car then drops it down to near the bottom of the radiator core support. I did just have the filter on the end of the MAF but the IAT reading were like 185* so I figured I had to do something. I am going to make a good intake pipe for it out of some 4 inch pipe but I was in a rush and did what I had to do.
So around $500 for some 243's then flip my 317's for 250 or so? What is the difference between the 243's and the 799's? Any idea how much e.t. the stock 243's would be worth vs. the 799's?
It is a custom built converter by Mikes Trickshift, he builds a lot of transmissions/converters for big hp cars out here. I had him build my th350 and this converter. It'll footbrake to about 3500rpm and flashes just over 4400. I am not sure what the DA was, this is in Dallas/Ft. Worth Texas so we are pretty close to sea level, but it was SUPER hot that day!
So around $500 for some 243's then flip my 317's for 250 or so? What is the difference between the 243's and the 799's? Any idea how much e.t. the stock 243's would be worth vs. the 799's?
It is a custom built converter by Mikes Trickshift, he builds a lot of transmissions/converters for big hp cars out here. I had him build my th350 and this converter. It'll footbrake to about 3500rpm and flashes just over 4400. I am not sure what the DA was, this is in Dallas/Ft. Worth Texas so we are pretty close to sea level, but it was SUPER hot that day!
I personally wouldn't swap the heads just yet. I would say you would see a .1 and 1mph increase however. I have never seen anyone going from 317s to 243s. I run ported milled 317s and they are getting the job done. If you are doing the work and tuning, might be something to consider, if not I would hold off.
I most definitely would get it 60' the way it should. I see no reason not to be in the 1.4s. That alone should let you hit your mark. I cut 1.50-1.52s barely spinning 370rwhp ptc 4000 373s 2200da..7.30-7.32@94.5.. raceweight is 3450 which I'm sure is heavier than you.
