CB99SS

I just installed a new TSP 231 237 cam in my 99 SS. I was running the C2 (224 224) cam from MTI with self ported heads. My previous number were 377 RWHP and 368 RWTQ. I also changed to long tubes and had a moser 9" installed. To day at TSP I had Jason tune it. Here's the numbers 380 RWHP and 337 RWTQ. Jason tried his best to find the torque but he had no luck. Does anyone know what would cause me to lost 30 ft-lbs of torque?



Thanks for the help.

Clipper

not uncommon to lose a little tq when going up on the cam like that, but you shouldn't have lost as much as you did, and it should have (in theory) more than made up for it with HP gains...and 3 more HP doesn't justify even the labor to change the cam. Granted, the 9 in. is sucking up some numbers, but I would think you'd still see a decent gain on a good tune. Unfortunately I lack the knowledge to really lend a thought here. Good luck man, I know that cam has got good numbers in it.

jrp

iTrader: (16)

the tsp231 has never been a big tq cam to begin with.

foff667

iTrader: (2)

people usually gain 10-15 hp going from a 224 to the 231 cam...you did add a 9in into the mix so thats gotta be sapping a decent amount of hp/tq but other then that I dont know what to tell ya other then change isnt always good? lol

Hardtop

iTrader: (3)

That 9" will suck up some power. Torque does seem a bit low.

Bruce

SSactionLs1

thats ALOT low. This was on a dynojet correct?

CB99SS

Tuning was do on a Dynojet. I might go ahead and slap some better heads on and see what happens.

Thanks

CamaroCain

iTrader: (1)

that's where i would start looking too. maybe some good S2 5.3's would work better with that cam. take it to the track and compare numbers there too.

CHRISPY

If you added a 9 inch that is easily 12-16RWHP lost right there with NO changes.

My drivetrain costs me almost 20RWHP (12 bolt, Heavy DS, iron disc clutch, steel flywheel etc)

Jason 98 TA

iTrader: (4)

I just talked to Cole on the car, and he said they think its something in the cylinder heads. I will be ordering a set of the Patriot 5.3l cylinder heads to toss on the car in hopes of finding the lost power. The weird thing is the car picked up about 6-8hp, which is about 10 less than we usually see when going from a 224 camshaft, but it was way down in torque. Hopefully after we get some fresh Patriot ported heads on that thing we'll see a good jump in hp & a huge jump in torque.

CB99SS

Going in I new my Heads and the 9" would eat up some power. The cam pulls great on the top end just down low you can tell the torque's not there.

Jason and the guys at TSP are great. You know every car is different. So for everyone worried about the cam doing the same to them don't worry about it. GO FOR IT.

I've got friends running that cam and there cars made great power.

Like I said every car is different.

Jason thanks for all the hard work yesturday. I can't wait to get the new heads on it.

Later

zwentbyyou

I have similar mods but do have the patriot heads 5.3 stage 2 and through the 10bolt put down 447/397. With a 9 inch I know it is much lower but like Jason said, the heads should really help and I didn't notice but if you don't, get a ported tsp throttlebody as well. Good luck

MyLS1Hauls

iTrader: (2)

Wonder if those heads have some weird turbulance at higher flow/lift levels?

Magred2001vette

iTrader: (2)

EXACT PROBLEM w/ my friend's car....his cam was installed a few degrees off! Did a professional shop do the install and did you instruct them to degree the cam in to be certain. Dot to dot doesn't always cut it .

gomer

iTrader: (13)

Back when I ran the 231/237 and a set of patriot LS6 styles I made 451rwhp 403rwtq.. so the cam can make some torque. I think replacing the heads will net you a load of gain.

SouthFL.02.SS

TSP 231/237 here. TEA 1.5's, Moser 9" here too.

Max torque: 387 on a stingy torque reading dyno.

Mike98WS6

iTrader: (5)

Don't kid yourself. This cam makes great torque.

Tony Mamo @ AFR

iTrader: (13)

My thoughts exactly...You might want to advance the cam timing a bit.

Also, changing heads does not address the original problem....it's merely a "bandaid"....it will of course make better numbers, but had you initailly had better results, even MORE power would have been available with a headswap...Find out what happened when the new cam was installed...For that matter, you might consider a different cam altogether if the cam you put in turns up "degreed" correctly.

Just my .02

Good Luck,
Tony M.

Clipper

It really seems that there's something else in play here, not just the heads. Jason, have you ever seen anything like this before? I'm sure everythings been leak tested... what all was removed for the install?

BOWTIE

Was the dyno with the previous cam done recently or quite some time ago. I can not see the heads causing low tq numbers like that unless something serious was wrong with them. I am in the camp with a few others, you need to check the cam timing. Perhaps the old cam was installed with some advance which might boost the tq down low at the expense of tq up higher. Also as previously mentioned, the 9" will sap up a lot of HP. The 9" is the least effecient rear axle. Even if you had a 12 bolt with the exact same internal weight, the 9" will still suck up more power. It has something to do with the way the pinion intersects the ring gear, it is just less effecient. Too bad it is also the strongest and easiest to do gear changes with.