Thinking of going with a MAX EFFORT 402 LS2 with Trick Flows that I ran across and she makes around 12:1 to 1 compression, and would swap this into my 02 Z06, that will be driven primarily on the street.?

I figured with a proper tune this should not be a probelm with 93 octane and of course if i go racing I will go with 100 unleaded, etc.

Who is running a similar set-up and this is also with a smaller cam 236/240, on a 112 lsa (if that matters or not) and do you think this a not a problem with 93 octane (AMOCO/BP FUEL).

 

You need to check your dynamic compression with that cam.

 

I run just about 12:1 on 93, so far so good. 232/236 112 LSA cam. I dont need race gas to race either, the 93 does the trick. My quech area if fairly tight whichs helps combat detonation.

 

This guy is, he has less detonation with the TFS 225's at 12:1 than the LPE LS6 heads at 11.5:1, and made 27 RWHP more power, 236/242 cam, stock LS2 shortblock, 507 RWHP.

https://ls1tech.com/forums/showthrea...t=rmitchell242

 

I want some TFS heads, I may have to sell my TEA stage 3 5.3's soon.

 

your DCR with those cams has gotta be CRAZY

 

I wouldn't say crazy, its in the 8.6 area. Over 9 is a little bit more extreme. I was going to try advancing the cam some since my setup seems to pull hard to some pretty high RPM, so I figured why not advance it some and see how it reacts. I may do it one of these days.

 

I am double checking but I believe it is 9 or 9.1, but will reconfirm. Figured as long as timing was pulled a bit in the right areas on a prof. tune I would be good to go but what are your thoughts?

 

Yes, i double checked and DCR is 9.1 to 1!

 

Just slap a bigger cam in there. You will lower you DCR and get more power. Win win situation. I think 8.8:1 is the limit for 93 octane. Good luck.

Brett

 

Why the hell would you run a 236/240 on a 402 anyway, thats a bitch cam for a engine that size?

 

Emissions maybe? I'm pretty sure most areas around Chicago have smog checks.

Jason

 

What sort of timing are you running? Are you on stock cubes?

 

Timing is advanced in the normal driving range, stock in the WOT area. 347 CI. WOT timing will be advanced when i go to dyno tune it.

 

no, no smog checks where he is, obd2 computer check and evap test. anyway, back on topic i'm at about 8.7 dcr 11.7 scr. i run pump gas, but the car isn't tuned yet, 9 is a little high for pump gas, make sure your tune is dead on and you should be ok.

 

IRONICALLY, 6 different cams where dyno all other variables being equal and the baby cam 234/240 with this compression ratio and the TFLOW 225s on this LS2 402 made the most power and did the best at the track (10.3X at 137) at race weight of 3400 lbs all motor (with a manual tranny Z28)!

 

Let me tell you why b/c this little freakin 234/240 cam (.600 lift, 112lsa) made the most power and ran 10.3 at 137mph at 3400 lbs race weight, and the engine builder who happens to be a succesful owner of a hard core LS1 Performance Shop, built this motor for his car, and he tested it against 5 other cams, all others were bigger, and the smallest cam won the R&D Contest. You run what works in a particular package and Not just throw in a big game and hope to make big power. The smallest cam simply kicked the big cam's azz across the entire rpm band probably because the fast 90 intake manifold does not flow enough air to take advantage of the big cams and their are a TON OF FOLKS here who overcam their cars (and end up making less power than if they really did their homework)!

 

^^ Good stuff, i like smaller cams anyway. I have a small cam and i made great HP numbers and I make a lot of power under the curve. I will be able to get over 475Hp on a little 347 after i tune it and have my FAST 90 ported out. Thats prety good for a 347 IMO.

I agree 115% about everyone overcamming their cars, I just wasnt sure how a cam that small would do in the 402, seems like it did the trick.

 

Are you ditching your FI set up?

 

what are the specs on that cam? If you dont mind sharing. i am researching a 402 build w/ TFS heads and it would be helpful,thanks. You can pm me if you dont want everyone to know. :-)