I would like some input about which RPM to set my rev limiter to. I'de like to roughly figure out some shift points and put in a more specific msd 6al rpm chip.

Engine Mods:
Vortec Holley Stealth Ram
SDPC Vortec TPI Crate Motor (2 bolt main, LT4 Hot Cam, 1.6 roller rockers, Vortec 64cc heads, hypereutectic pistons, 9.6 to 1 compression ratio ...ditched their manifold...)
**LT4 hot cam has 218 intake / 228 exhaust @ .050" with 112 lobe centerline and .525" lift
Hooker Long Tubes (Fel-Pro gaskets, catalyst adapter)
30lb SVO fuel injectors
Gnuetelli Adj. Maf Sensor
Holley 58mm TB
MSD Superconductor 8.5mm wires
holley 275lph fuel pump
Accel shorties spark plugs
Hooker cat back
Msd 6AL
Msd billet HEI distributer
Msd blaster coil
180* T-stat
EGR delete
All Painless wiring
All new sensors
Hooker Long Tubes
Hooker 3" Catback

Also, anyone got any ideas of possible dyno or 1/4 guess-timates?

Suspension mods:
Bilstiens shocks/struts
adj panhard bar
adj lower control arms(rear)
ford 9" auburn pro posi /w 3.89's
SFC's
Thunder racing HD rear swaybar
spohn steering brace

 

Basically, I just want a SAFE reving range...

 

IMO, I wouldn't spin it beyond 6500. Isn't that roughly where the Hotcam makes it's peak HP? Can you get the car on a dyno and see where it makes peak HP?

 

everyone I know usually runs a chip about 200-300 rpm higher than where they usually turn it too. - This way if something gives(driveshaft, trans, etc...), it catches it quick enough, but also allows a little room for those runs where "it just felt good"...

that said, I usually turn around 7200 w/ my combo. I have turned as high as 7600(it felt good), which is the chip...

 

hmmm. One of the reasons i'm scared to rev high was a post I saw about a guy with his brand new 383 revved close to 7k and cracked his #7 cylinder wall. I tryed to find the post - no luck.

 

rpm doesn't cause cracked cylinder walls, ****-poor machine work/high mileage does... - My dad's blown big block camaro turns 10k(now imagine the blower rpm @ 30% overdrive... )

not that you combo would make power near that, just that thre's nothing wrong w/ higher rpm levels. - I would agree with TPI Monte SS, chip it about 6500. Your peak power should be around 5800=6-6200 shift point=6500 rev limit.

 

Sounds like your dad has a fun toy.

I have made a similiar thread on Stealthram.com
If you would like to follow this more, check it out:
http://www.stealthram.com/phpBB2/vie...hp?p=3488#3488

I'm going to try my hardest to pull 400 flywheel with tuning. We have a mustang dyno here at college that I'm trying to get on.The problem is that you can't get print outs. The dyno isn't communicating well to its other components.

If you wonder why I state 400 flywheel, check out this thread from 2 yrs ago. Brian Gruben's car was the lab rat for the SDPC 360 TPI... Follow the thread for more info.
https://www.thirdgen.org/techbb2/sho...t+cam+and+sdpc

 

Thanks for the threads. GREAT reading.

does anyone besides me marvel that with 2.77s this engine is just fryin the wheels?

dyno hp with that set up should be in the low 300s. 330?


if you get the tune right and can manage to hook the car you should be DEEP into the 12s. there was a recent article with a rebuilt 350 stealth ram and stock chip running 12.3s

your heads can olny help out more.

let us know when you git-r-done.

don't forget to have fun with the ls1s. mustangs just aren't fun anymore.

 

If you have decent power it's easier to spin the tires w/ a steeper gear. The wheel speed will come up faster with a higher gear ratio, thus if it has the power, it'll spin easier. Thats a big part of the reason lower gears will help your 60' is by not bring the tire speed up so fast, so that they stay hooked. - as I said though, this largely depends on your power level...

 

so you are saying that you spin worse with 2.77s than 4.11s?

don't mean to sound ill informed but that sounds backwards to me. if i am understanding you correctly.

 

You spin worse with 4.11's than 2.77's...

The higher the gear ratio, the shorter the shifts, less top speed, and the more torque.

Lowering the ratio will give you longer shifts, more top speed, and less torque.

 

Yup, that is the way i always understood it but that isn't what it sounded like when i read the previous post.

Just wanted to be sure.

 

If you break the tires loose, you spin worse w/ the 2.77 than the 4.11's. In a high HP application it's harder to get traction w/ higher(numerically lower) gears than its is with lower gears, becauswe of the wheel speed. If you have the power to turn the 2.77's, you wheel speed will come up much faster, making it easier to loose traction and spin the tires...

A buddy of mine was only getting high 1.8 60fts/low 1.9's w/ 3.73's. He had to really feather it to not spin out of the whole. He went to a 4.10 and is now going consistent 1.7X's, leaving on the mat.

I've been around drag cars my whole life, and my dad was racing 20 some years before I was born. I also help tune on 3 outlaw 10.5 tire cars. It's much easier to hook say a 4.56 than it is to hook the 3.90... BUT, as I said before, IF you decent power.

 

so you are saying that becasue once they break loose they will spin faster with 2.77 than with 4.11. not that it is easier to actually break the tire loose just to spin it faster after you break it loose.

it still doesn't make sense to me that it would be "easier" to drive 4.11s than 2.77s out of the hole. if you are already spinning like made 4.11s would seem to just increase the initial traction problems when you hit the gas. the torque mutiplication with 4.11 would make a huge difference so unless you can make em stick i still don't see how it would help. i just can't get my mind around it. help me out here.