Finally posting my 3400 build

[johnnymossville]

yeah 3" exhaust is just too big for your power level. has the short length of your car been factored in? a shorter pipe will have less surface area and less flow resistance. my dad's 03 Z06 has 2.5" exhaust the whole way through and he's making ~ 470 HP. If your making over 350 crank HP then 3" would be ok. all in all, i don't think it's really critical to have the "optimal" biggest size.

Is that a single pipe all the way back, or dauls? I don't see how it's possible to run 470 hp through ONE 2.5" pipe.

[torq455]

it has duals. i agree with the single pipe.

[IsaacHayes]

I do think though that you should go with dual 2" or dual 2.25" from the manifolds, into a Y into 2.5" single back. I'm willing to bet you'll loose some power with 3".

[torq455]

agreed. bigger is not always better. too big on the manifolds and you'll lose the scavenging effect from low velocity.

[johnnymossville]

Well, I finally started assembling the engine today and it will be finished tomorrow. I have some pics and I will get more when it's together. I"ll probably post the pics and the final specs Sat. night or Sunday for everyone to see. I've been collecting parts and the car over the eleven months and it's finally coming together. I want to thank Superdave, John (ForcedFirebird), and Ben for all of the help that they have given me. When I get it running I'll probably be needing a little help with the tune, but it should be close thanks to Dave. I'm still on vacation next week so it will be in the car and running, hopefully driveable!

[Guest]

looks like there is bind in that spring.

[johnnymossville]

IT IS FINALLY IN THE CAR! The engine is in and now to hook everything up. I'm useing two 3500 front exh. manifolds but I'm going to have to change the cooling fan because the front mani. hits it. Hell, I was worried that the rear mani. wasn't going to fit and it has plenty of room.lol The headers that Fastlane02 on b-stuff is making aren't completed yet ,so I don't have headers. Anyway I've got some pics in the camera and when I get a chance I'll post them. When it's running I'll post some datalogs and get some opinions on the tune. Thanks again for your help Dave.

[Superdave]

Nice!

that thing is gonna scream

[01GPGT]

i am going to be doing the exact same set up


are you going to post dyno mumbers? and an exhuast clip?

[johnnymossville]

After it's running I'll post some exhaust clips. The cam is not that big but I hope that it still has a little lope to it. I am going to run duals and I've got a pair of Dynomax Super Turbo muffs for it already, but haven't decided on the tips yet. The dyno will happen asap, but it needs a few miles on it first.

[3400-95-Modified]

I'm curious to see what this thing does with 11.5:1 compression... Thats way up there.

[IsaacHayes]

Compression FTW!

[johnnymossville]

Just got home so not much will get done tonight. I wanted to build this engine for torque as well as hp so that I wouldn't have to crank excessive rpm regularly, not to mention it is going to be my DD. lol Sometimes I wish that I had gone bigger with the cam like maybe a #1280 grind, but hey this is what I bought for a reason, good performance and durability. I hope. I thought that I would try the higher CR to squeeze what I could out of it. Ben ran me some numbers and this is what he came up with using the 3500 manis. and he said that the headers will help a lot.

RPM...HP..TQ
2000..89..233
2500..115..241
3000..148..259
3500..179..269
4000..209..274
4500..232..271
5000..252..265
5500..264..252
6000..275..241
6500..261..211
7000..241..181

Still not bad, looks like 6000 rpm shifts to me. Oh yea, Ben,did you get those WOT-TECH made yet?

[3400-95-Modified]

damn, thats like the same numbers I got... shows you what 11.5:1 will do over 9.15:1 But my compression is low so it can accommodate juice

[johnnymossville]

^^^ Yea, no power adders for me. Like Superdave says "N/A all the way, FTW". LOL It is what it is, I'll just have to tune the hell out of it and get some headers on that damn thing. Dave has long tube headers and you have headers, it's killing me man.