I recently had the pleasure to tune a strong running LS1 F-body. It made extremely good power considering it had a number of very dyno un-friendly parts on it...namely a 12 bolt with 4.56 gears, a steel driveshaft, and heavier than stock billet steel flywheel.

This was a true stock displacement LS1 with flycuts in the stock pistons. Credit for the big power comes thanks to Tony Mamo who ported the FAST 90 intake manifold and massaged the combustion chambers and valve job on the AFR 205 cylinder heads. The chambers are 59cc. The cam is a Thunder Racing 242/248 .610/.615" 110LSA T-Rex cam. The headers are QTP 1 3/4" with high velocity merge collectors and 3" single cutout. The motor was tuned in speed density as there was no Mass Airflow Sensor.

The car had an SLP Blackwing intake lid and SLP dual dual catback exhaust. With the exhaust closed, the car made 488rwhp/421rwtq. Here's the dyno:



Next we opened up the 3" cutout. The car made 497rwhp/428rwtq. Being so close to 500, we decided to swap the SLP Blackwing intake lid out for a more free-flowing UPD lid. The motor gained another 5rwhp for the final number of 502rwhp/432rwtq. Kudos to Tony Mamo for another awesome performing intake/head combo. If the customer adds an electric water pump, Yella Terra Rockers and a lighter flywheel, the combo will probably dyno another 15 rwhp higher. A 10 bolt with 3.42 gears and aluminum driveshaft would have dynoed even better.

 

Pretty nasty Pat !!!! Lots of power there !!

 

Just went back and really took a look at the graph. What a monster 346. With a cam that large, how's the driveability in a 346 ?? 242/248 is bigger then the cam in my 402 !!!

 

Driveability is quite good thanks to the high airspeed of the cylinder heads and the speed density tune. Interestingly, we found this combo liked less timing than some other cylinder heads. We started at 28 degrees at peak power, lost 2 rwhp when we went to 30 degrees, but gained 1-2 rwhp when we dropped timing to 26 degrees. A credit to excellent combustion efficiency by the Mamofied AFR 205s. Yes, this is a big cam. Funny thing, most people consider the T-Rex to be a camshaft best suited for unmodified stock cylinder heads. I think the dyno graphs show that it is also a formidable stick with the right cylinder heads too.

 

Well done Patrick!

 

Looks like the car with the exhaust capped isn't all that bad considering the power it has down low. does the cam surge at cruising rpms say like 1500? Obviously, by looking at the combo, this soesn't appear to be a car that takes many long distance trips on the highway so I am sure if there is a cam surge down low, it isn't experience much.

(edit) - sorry, I was writting this as Pat G was posting.

 

Whats a UPD lid?

 

Those afr's are really performing... Nice job!!

 

From what I have gathered it is a better flowing lid but the company bailed out a few years back. Someone that Pat knows still has some laying around and they are very nice lids. Do a search and you will come across them.

 

wow 500+ thru 12 4:56s is impressive! I like how you picked up power with less timing, it just goes to show that with a cc this efficient you dont need a 28+ degrees of timing to make good power.

 

Sick numbers!!

 

SLP Blackwing intake lid, does anyone have a picture if this lid...is it the one that necks down real thin by the maf or is it like any other aftermarket lid...

amazing numbers truely...

 

This is the second time Ive seen you show that the blackwing is a bit restrictive. Or you trying to market the UPD lid? J/K nice gains.

 

The T-Rex makes for one ugly *** graph, but it does make the big power.

Nice job fellas. Especially for the drivetrain in place.

 

Good job Pat. Thats a lot of power for the heavy drivetrain! Very impressive

 

How does the power hold past 6800?

 

Looks like the HP curve was still climbing......you think with a more stout bottom end you could've spun her a few hundred more RPMS and picked up more power ?? Question is, would it be worth it considering the torque was diving ??

 

great power... good job to all involved.

 

good job pat!!!

 

was that knock at about 4800 rpm? seems like that cam combination is still pulling at 6800 rpm