Just wondering what compression ratio and kind of power my motor is sitting at. I've not yet been able to make it to the track or a dyno. It's a full bolt on LT1 with a cam and full supporting mods through the 4L60E. Motor also has .039" thick felpro head gaskets and the heads were milled .030". Here is the full build list, any power estimations?

Stock 80k LT1 block, Lunati voodoo 219/227 .545/.560 112 LSA, lunati voodoo HD timing set, TFS hardened chromoly rods, ls7 lifters, arp rocker studs, cc guide plates, 1.6 rr's, lunati 7394K1 spring kit, .030 milled heads, valve job,\ felpro .039" head gasket, ewp, 160 T-stat pacesetter mid-tubes, hooker aerochamber catback, ebay Cai, NGK tr55's, bluestreak 8.5mm wires, cat delete, egr delete, tb bypass delete, tubular LCA's, BMR lowering springs, 275 NT555 G2 on all four corners. I'm sure I'm probably forgetting a few odds and ends but oh well.

I've put about a car and a half on a LT/exhaust/cai C5 LS1 A4 car from a dig up until about 100 without my new converter. Both of us were spinning off the line, unfortunately I don't have video of it or otherwise I'd post it up.

 

Being an auto i would guess 320rwhp. Or about 390 flywheel.

 

This is my exact HP guess on a good day. The small Pacesetter headers will hold you back.....IMHO.

Off hand, I'd say your compression ratio is just shy of 11:1.

KW

 

How much power do you think a good set of longtubes would yield over the mid lengths? The car is lowered so I would definitely need something that tucks up underneath the car decently. Also, spark plug access is another biggie.

 

I'd say 10-15 HP given you have stock heads and a mild cam.

You step up to ported heads and more cam and the difference could easily reach 25 HP.....and that's to the wheels.

KW

 

Half the stuff you listed won't add any power. Really the only thing you have going is the cam rockers and exhaust. All the other stuff is good supporting mods. You'll gain a little with the bump in compression but nothing crazy.

I could see 330 at the wheels with an auto.

 

I feel that you have a nice street set up there. Good lift cam, duration is in a good range for usable power. Even if it only dyno's 320rwhp i guarantee that set up makes nice average power and pulls hard in the mid range.

Im not convinced the pacesetter mids are holding back much hp. Unless they are a shitty design. I researched headers for months and the 1 5/8 Mac Mids with catless y pipe was the best balance of power/plug access/fitment/ and ground clearance that i found. Look them up. If fitment wasnt an issue i would of sprung for some 1 5/8 long tubes all the way to 450hp. Over 450hp i would step up to 1 3/4 long tubes. Lots of opinions and studies on header primary size.

I figure my car is in the 320-325rwhp range too. Our biggest bottle neck at this point is def the heads. If i could do it over i would have spent the extra money for LE1 heads. Like previously mentioned ported heads could jump us up to 350-360rwhp range. All in all, small cam 1 5/8 header primaries make for a hard hitting torque band for the street. Peak hp #'s arent the most important thing. My next build is a 383 stroker with emphasis on MAD torque in the 2500-5k range.