CNC 243s on LS3
Yea, heads and intake are the same, basically a LS2 block (with dod) with LS3 heads. As far as the Fast vs LS3 intake in your situation, probably not worth the coin. You could get the same results from porting the LS3.
One thing I should point out though, before I started modding the car, there was a clear point that the car seemed to lose power to me. I don't have any proof of it but it just felt different after this one day. I was pulling onto the street and of course I gunned it, didn't think about traction control being on and when it started spinning the traction control pulled it down to the point of it almost quitting. I have no clue what it could have hurt but it never seemed right after that.
I've read a lot about porting the stock intake and I can't find any proof that it helps anything. Rick Crawford has said porting the factory intake doesn't help, but I know he does something different to them that does help.
On a typical 500hp setup, how much hp is a fast 102 worth over an LS3 intake?
I've read a lot about porting the stock intake and I can't find any proof that it helps anything. Rick Crawford has said porting the factory intake doesn't help, but I know he does something different to them that does help.
I've read a lot about porting the stock intake and I can't find any proof that it helps anything. Rick Crawford has said porting the factory intake doesn't help, but I know he does something different to them that does help.
Rick does a thing I call the "Rod-Mod". He inserts aluminum rods in the intake to act like velocity stack bells on the ends of the runners to help grab more air at the runner entry. I have a couple friends who are better than I am at that kind of stuff who did it themselves, and it took them forever, but it did work well.
How much do you think a fast 102 is worth over a stock LS3 intake or a Crawford modded one?
I think it's worth 10-20 over a stock one. Not much at all over a rod-modded one. If you went FAST, the real advantage would be the mid-length runner option for higher RPM performance. Just by moving the power peak, that'll raise it up vs the standard runner FAST intake.
I was going off his cam. Should peak around 6300ish and I was under the impression the fast doesnt make anything more under the curve with the mid runner. Doesnt the MSD make more under the curve and up top? Plus it uses the stock rails.
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Verdad Gallardo to check the injectors or coils, just unplug one at a time and see how engine acts. If it was firing it will start running like crap. if it doesn't change up thin something is up with tht injector or coil. If this makes since.
But I was sort of assuming a new cam was going to end up in his build anyway. My cathedral fast 102 works well with the stock LS2 rails. I'm not sure how those compare with the LS3 rails.
I'm gonna change the cam out to the 229/244 or something similar. Only concern I have is P to V clearance and if I can mill any. I flycut the pistons in my camaro but I had the motor out, and it isn't a daily driver so not as big of a deal if I screw something up. Not sure I want to try that with the engine in the car. The G8 isn't a daily driver anymore but still.
Yeah, that's a good point. With his current cam, the mid length would be a poor match. I have a friend with mid length fast runners on a 388, and he's very happy with them. Most of the dyno curves I've seen on the mid length fast vs full runner fast look a LOT like my overlay between the MSD and full runner fast. So, short version, I'd bet MSD and mid length fast are about identical
But I was sort of assuming a new cam was going to end up in his build anyway. My cathedral fast 102 works well with the stock LS2 rails. I'm not sure how those compare with the LS3 rails.
But I was sort of assuming a new cam was going to end up in his build anyway. My cathedral fast 102 works well with the stock LS2 rails. I'm not sure how those compare with the LS3 rails.
I appreciate all of the advice so far.
Also, I'm not afraid to turn it 6800-7000. It won't see that RPM very often so I think that will be fine.
I imagine you'll grind that on a 112+4 ish...should put your peak in the 6.6-6.7k range and shift at 6.8-7k. So yea, like darth said, you could see some gains up top from an intake. Highly doubt 10-20hp after 4.5-5k is worth $1.2k for a fun toy, but thats totally your call lol. I would try to find some LS3 valves while your in there. Those are some big ole heavy mama jammas in in solid stem form. If I recall correctly something in the 280 degree @.006 duration gives about .080" P to V on a 112 center line, which is about what the 229 LSL lobe is. So you should go ahead and plan on fly cutting if you mill the heads.
BTW, how do you like that verter in the car? I was looking at their 278mm 3-3.2k version for my daily
BTW, how do you like that verter in the car? I was looking at their 278mm 3-3.2k version for my daily
I imagine you'll grind that on a 112+4 ish...should put your peak in the 6.6-6.7k range and shift at 6.8-7k. So yea, like darth said, you could see some gains up top from an intake. Highly doubt 10-20hp after 4.5-5k is worth $1.2k for a fun toy, but thats totally your call lol. I would try to find some LS3 valves while your in there. Those are some big ole heavy mama jammas in in solid stem form. If I recall correctly something in the 280 degree @.006 duration gives about .080" P to V on a 112 center line, which is about what the 229 LSL lobe is. So you should go ahead and plan on fly cutting if you mill the heads.
BTW, how do you like that verter in the car? I was looking at their 278mm 3-3.2k version for my daily
BTW, how do you like that verter in the car? I was looking at their 278mm 3-3.2k version for my daily
I like the converter. It feels a little "clunky" for lack of better term, at times, but I like it because it feels like a stalled auto.
I originally had the 278mm 2800-3200 and hated it. It didn't even feel like it had a stall. Changed to the 278mm 3000-3200 and hated it also. Finally switched to the 245mm and all is well.
Circle D really worked with me until we got it the way I wanted it. I had an extra $100 or so in shipping costs but it was well worth it.
At minimum I would go with the 258mm. BUT, I love the feel of a stalled auto and have a high tolerance for that feel. My wife drives the G8 almost daily with the 245mm and hasn't complained.
Interesting...I have their 245mm in my bird. I have a high tolerance for it but I definitely dont want anything like that one for the G8. I regularly drive the car on a 230 mile trip through mountain roads and its my daily. Why did you hate the 278mm? For this car and my situation I'm still leaning towards it as I want it to be completely un-noticable until I take it to the drag strip maybe once or twice a year. Sorry for the hi-jack
You definitely won't notice the 278mm driving it.
My car cut stock 60' times with the 278mm (2.03). Now we know my car has something wrong and isn't dialed in because it only ran 8.38 @ 88mph, but it still should have cut a better short time than that. It wasn't any easier to do a burnout than with the stock converter. It wasn't very fast on take-off. It just basically didn't act like it had a stall imo.
I haven't taken it back to the track with the 245mm but I can light the tires up at will now and it's so much stronger taking off.
I seriously wouldn't even bother changing it if I was gonna go with a 278mm. If you got more than a .1 at the track I would be surprised.
Friend of mine had the same converter in an 88 monte carlo with a 6.0 and 4.10 gear and it wouldn't 60' either.
My car cut stock 60' times with the 278mm (2.03). Now we know my car has something wrong and isn't dialed in because it only ran 8.38 @ 88mph, but it still should have cut a better short time than that. It wasn't any easier to do a burnout than with the stock converter. It wasn't very fast on take-off. It just basically didn't act like it had a stall imo.
I haven't taken it back to the track with the 245mm but I can light the tires up at will now and it's so much stronger taking off.
I seriously wouldn't even bother changing it if I was gonna go with a 278mm. If you got more than a .1 at the track I would be surprised.
Friend of mine had the same converter in an 88 monte carlo with a 6.0 and 4.10 gear and it wouldn't 60' either.
