Feedback on this setup - SRT Forums

CIVICEATER · 07-08-2008, 05:28 PM

I'm thinking about getting a ported head and a set of cams for my car. Mods will be basically a full bolt on p&p s3. I was thinking about a ported head from cnc porting +1 intake +2 exhaust with crane 12's. The thing is i dont want to lose any spool time or bottom end. It seems all these cars I see with ported heads and cams have a lot of lag. Is it maybe because of the large cams I see most of them using (crane 18's, crower s2, bc s3, etc.) or do ported heads and cams make it lag. Give me some feedback on the head and cam combo I want to do. Like will where I will gain power, where I will lose power if I will lose power, and how much more lag will I get?

91PumpKing. · 07-08-2008, 06:43 PM

i thnk lag by big cams is a lil over exaggerated. a SOLID EBC and/or cam tuning will over come that. my 50t/.48ar spools the same as everyone else (21psi by 3200) and i have crwer s2 cams...then again...my ebc might play a role in that...

if you are worried of losing spool time...go built head w/ crane 14s...

CIVICEATER · 07-08-2008, 07:06 PM

I forget the specs off the top of my head on the 14s. I think they were pretty close in specs with the 14 being slightly smaller on the exhaust side. Correct. I'm pretty sure the 14's give good bottom and mid range, but do they fall off dramatically on the top end due to the smaller exhaust side?

91PumpKing. · 07-09-2008, 09:08 AM

Quote: Originally Posted by CIVICEATER

I forget the specs off the top of my head on the 14s. I think they were pretty close in specs with the 14 being slightly smaller on the exhaust side. Correct. I'm pretty sure the 14's give good bottom and mid range, but do they fall off dramatically on the top end due to the smaller exhaust side?

theyll fall off..yes, but nothing really to account for at 6k... the farther north you go past 6-6.5k, the harder itll fall.

the fact that it has larger lift and longer duration just means its going to flow more than the stock cams regardless, so power drop off wont be as bad as you believe.

i would LOVE to try out 14's on my built head on my 50trim/.48ar. torque is key to pulling ahead of someone or getting out of the hole quicker...
im too cheap tho, and my crower s2 cams are doing a great job..

CIVICEATER · 07-10-2008, 07:47 AM

Thanks that was good info. So there pretty comparable to stock cams might even pull slightly more on the bottom end with a very nice mid range and slightly more top end than the stockers. It seems as if they are a pretty good all around cam. If thats the case that is exactly what I'm looking for.

91PumpKing. · 07-10-2008, 02:53 PM

Quote: Originally Posted by CIVICEATER

Thanks that was good info. So there pretty comparable to stock cams might even pull slightly more on the bottom end with a very nice mid range and slightly more top end than the stockers. It seems as if they are a pretty good all around cam. If thats the case that is exactly what I'm looking for.

youll gain power irregardless, everywhere through the powerband than stockers.

your torque will be significantly "torquier" and higher than any of the crane model cams..

each cam has its special attribute.
but if you are looking to retain the torque/spool of the s3, run 14s. the ported head will make up for any top end youd lose over 12s at the higher rpm's.

srad2drag has a 44lb s3 w/ 14s. AWESOME powerband out of it...

turbo2oh · 07-10-2008, 02:58 PM

I agree with the added lag with a UNTUNED bigger cam like myself. I am running a cheap mbc also BUT you can change your driving style to help.. 2step and brakeboost. Thats what I learned from going custom s3 to bigturbo/built head. I think my cams tunned might help alittle along with a ported turbo/mani which is comeing soon.

CIVICEATER · 07-10-2008, 03:58 PM

I think 14s are going to be the cams that will suit me best. Its a DD so I really dont want to be brakeboosting all the time. I just want to mash the gas and hold on for dear life.

Quote: Originally Posted by turbo2oh

I agree with the added lag with a UNTUNED bigger cam like myself. I am running a cheap mbc also BUT you can change your driving style to help.. 2step and brakeboost. Thats what I learned from going custom s3 to bigturbo/built head. I think my cams tunned might help alittle along with a ported turbo/mani which is comeing soon.

How big of cams do you have? If you tune then you will probally pick up some power, get a smoother idle, more vac, and a little less lag.

91PumpKing. · 07-10-2008, 04:14 PM

Quote: Originally Posted by CIVICEATER

I think 14s are going to be the cams that will suit me best. Its a DD so I really dont want to be brakeboosting all the time. I just want to mash the gas and hold on for dear life.

How big of cams do you have? If you tune then you will probally pick up some power, get a smoother idle, more vac, and a little less lag.

when tuning for power, my idle, and vac always got worse.

w/ my crower 2s, after tuning them, sat at a steady -10vac...and loped harder than hell.

CIVICEATER · 07-10-2008, 05:43 PM

Isn't lope caused by overlap? Hmm you would think it would lose power with more lope, but I guess not.

91PumpKing. · 07-10-2008, 05:49 PM

yea.
but any changes on my sized cam end up changing the flow pattern drastically since theyre pretty big.

and fwiw, i was widening my LSA (less overlap) instead of narrowing it..

CIVICEATER · 07-10-2008, 09:05 PM

Yea you do have some big cams. I wonder why it was loping so much if you were widening LSA. Should it have gotten better. I'm sure it would still lope since they are pretty big cams, but just not as bad. Whatever though as long as you got more power out of it and it wasn't peaky power then it really doesn't matter. Another reason why one persons timing might be dramatically different than another even with a similar setup. Hel even with the same setup timing might be different because not all motors are set to TDC at the same degree and no two motors are exactly the same.