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If you know of a good grind that won't run into PTV issues on a 110-111 that won't beat the valves to death with 1.8 roller rockers, .660 BTR dual spring kit, on a factory 706 head I'm all ears.
mxguy1286 is the 4.8 SBE record holder going 8.2x or so was on this Tick cam on 243's. I doubt I'd be able to get up on my converter with that and the 706's. He wasn't running it past 7k either.
If you know of a good grind that won't run into PTV issues on a 110-111 that won't beat the valves to death with 1.8 roller rockers, .660 BTR dual spring kit, on a factory 706 head I'm all ears.
mxguy1286 is the 4.8 SBE record holder going 8.2x or so was on this Tick cam on 243's. I doubt I'd be able to get up on my converter with that and the 706's. He wasn't running it past 7k either.
227/231 @ 114 .623/.598
....
Have you thought about calling Kip? I thought they did custom lobes for all kinds of vendors and stuff.
How much timing are you guys pulling from your total ad how do you determine that number? Let's say it likes 12 degrees at 20 psi, what do you pull it down to under 5500?
I'm talking a couple/few degrees here on a best effort setup. My lower boost config still gets a degree pulled out of it near peak torque, and ramps back in above 5500.
if you know of a good grind that won't run into ptv issues on a 110-111 that won't beat the valves to death with 1.8 roller rockers, .660 btr dual spring kit, on a factory 706 head i'm all ears.
Seeing 22 drive pressure and 20 at the intake...(not sure what the pressure drop across the IC is) Not too shabby.
Ended up getting a deal on the 217/222 @ 111 .56x cam. Should be about .600 lift with the 1/8 rockers I'm running. With a .025 milled 799 head and .041 HG It's only spitting out 155-160 compression wise. Was thinking I'd see more. Degree'd cam was a 1/2 degree retarded form the card.
Makes boost on the T-brake no problem with the tight converter. Saw 12 lbs and 5k quick with no limiters setup yet. Total dog until 4800 or so rolling into it on the street. Hoping that won't matter at the track.
Just to update this I am seeing roughly the same back pressure with the 4.8 as I saw with the 370 which is surprising. !.32 T6 S480 peaks out around 1.4:1 at 20lbs. (tapped at the turbine inlet in the turbo housing) 3 more psi didn't make any notable MPH gains. (assuming its the converter).
Runs the same times it did with the previous 4.8 S476 combo. About 152-153 traps and 9.0x-9.2x ET's. Still had the 14-0 stator all this year and it built boost easily. It does seem to hang RPM wise and it wasn't able to climb much past 6600. Re-stalled the PTC 9.5 to a 17-0 stator this winter. We'll see how this does in the spring. If that doesn't allow it to rev and make more power, I'll try a new cam/intake combo.
PTC and a few others seem to think it’s acting “normal” for my setup. They say it’s pulling it down to the stall point on the shift then then trying to crawl out slowly but can’t do this efficiently due to the lowish amount of power I make combined with the tall gear/tire I run. They wanted me to try a 4.10 gear and a 15.5 stator. But I’m not willing to give up my street gear. Hoping loosening up the converter will allow more RPM to get past that stall point on the shift. We’ll see anyway, don’t want to change too much at once. Have a 3.80 I can try too but that's as far as I want to go gear wise.
The way I saw it was clutches don’t have a “fluid coupler”. According to PTC you cant get the fluid in and out efficiently with my setup. Though others have run similar gearing setups with great success. Just none with this converter that I’m aware of. Only guys running this unit I know make 1200+hp.
Last edited by Forcefed86; 12-28-2018 at 12:24 PM.
Maybe so, but your car’s making some decent power. A 4.8 at 20psi is no slouch. Not like it’s only making 450 to the wheels. Hell, I’d buy a used gearset for $35 just to try it and eliminate or verify the idea. There’s gotta be a way. Funny too is that your Mustang is doing something similar, no? Hanging around 5800 or so with the cheaper 10” converter? I’ve got the cheaper converter in mine and ran a 3.08 with a 27/60 at 3400 lbs. Itd pull to 6500 no sweat at whatever boost I wanted (low or higher power).
I was running a 3.50 gear. I tried 3.64’s.(also tried dropping to a 28” tire) It did help a bit but not a night/day difference. Grabbed a set of 3.80’s to try next, but my DS locked and glide blew before I got to try them. Figured while the trans was out I’d send converter in since everyone agreed I don’t have enough power for a 14 stator converter. I sure don’t have the answer, but the opportunity to change the converter presented itself.
Mustang is making even less power w/ 241 heads, lowish boost, and a 2.73 gear. I feel like that converter is too tight as well. Only common ground I can think of. I asked for a converter that would stall to 4k behind a bone stock NA 4.8 since my original turbos were 72/68’s. I ended up with a 5.3 (with a small cam) and It still barely stalls to 3200 out of boost. They have different stators for the 10” converters as well and missed my stall request by a mile.
Not sure if you know the part number of the 10” but mine’s a 21 blade +200 stator. I’ve taken it 3600 on the brake, but haven’t tried any higher. It works so good, I wouldn’t change it, but I’m going to a glide next year and am concerned with going to the 9.5 and possibly missing the mark.
Ended up getting a deal on the 217/222 @ 111 .56x cam. Should be about .600 lift with the 1/8 rockers I'm running. With a .025 milled 799 head and .041 HG It's only spitting out 155-160 compression wise. Was thinking I'd see more. Degree'd cam was a 1/2 degree retarded form the card.
Makes boost on the T-brake no problem with the tight converter. Saw 12 lbs and 5k quick with no limiters setup yet. Total dog until 4800 or so rolling into it on the street. Hoping that won't matter at the track.
this is the first time I've seen the cam specs your running. The 35* IVC is what is holding the engine back from revving past 6600, for sure.
put in a cam more like what John suggested, or better yet get it from him.
Id like to see you run a 224-230, 110lsa like John suggests, but put it in +2 advanced
Not sure if you know the part number of the 10” but mine’s a 21 blade +200 stator. I’ve taken it 3600 on the brake, but haven’t tried any higher. It works so good, I wouldn’t change it, but I’m going to a glide next year and am concerned with going to the 9.5 and possibly missing the mark.
my 9.5 PTC 15-35 is awesome with my 3.73/ 1.80 glide combo, even after stepping up the power
this is the first time I've seen the cam specs your running. The 35* IVC is what is holding the engine back from revving past 6600, for sure.
put in a cam more like what John suggested, or better yet get it from him.
Id like to see you run a 224-230, 110lsa like John suggests, but put it in +2 advanced
Thanks. cam swaps in the future for sure just wanted to do one thing at a time. Do you happen to know the LS6 cam ivc? We were able to take that cam to 7200 no problem on a friends 4.8. Believe it was a 204/218 but dont recall lsa. Im sure it wasnt ideal, but it pulled there without issue so i assumed this cam would too. The isky triple 12 cam also seemed to pull to 7k just fine in my old 4.8.
Thanks. cam swaps in the future for sure just wanted to do one thing at a time. Do you happen to know the LS6 cam ivc? We were able to take that cam to 7200 no problem on a friends 4.8. Believe it was a 204/218 but dont recall lsa. Im sure it wasnt ideal, but it pulled there without issue so i assumed this cam would too. The isky triple 12 cam also seemed to pull to 7k just fine in my old 4.8.
Looks like the ls6 is on a 117 lsa. And the trip12 was a 212/212 @ 112.
If the ls6 cam is installed strait up it will have an ivc at about 39* or 40* abdc. This is certainly enough to allow a 4.8 to Rev out to 7k.
And the triple 12 will have an ivc of 38* installed strait up.
03-01-2017 | 11:36 AM
