taintedsoul

Hey all,I am in the middle of doing a 408 tt build and could use some help or opinions on a cam.The car is a 99 c5 and it weighs 3390 woth me in it.This is my first turbo build so be gentle🤣.
The motor
408ci
317s with tsp stage 2.5 milled down to 68cc
Ls6 intake
Bbk 85mm throttle body
Comp should be 9:8-1
rear gears 3:42
M6
I would like to run the huron tt kit with 6766s
my cam choices are
Sloppy stage 2 .228/.230 .585 .585 lift 112lsa
btr stage 2 .226/.231 .610/.608 113+4. Lsa
truck norris .215/.227 .552 .552 lift 107 lsa
Btr recommended a .237/25X .619/.619 lift 117 lsa but that seems big to me.want it to sound cammed.Im open to other cam sugestions.
Goals: adjustabilty between 700-1000hp,minimum lag,want it to throw my eyes back into my head.And yes i know that i will need many more drivetrain upgrades but its motor first.as i know little about turbo builds if anyone could help me get where i want that would be great.
Thanks
Jim

brentsz06

my vote is btr red hot, stage 4, 3, and 2. do not get caught up with the idea that you need a turbo specific cam or anything like that. its been proven that N/A cams work perfectly in blower/turbo cars. personally i think they work better as the results show more mid range power and torque while needing less boost.

666lisa

Yes u r right richard holdener has a special on this and the cams were 120 ls9 cam 112 and 108. The 108 proved the best. All the specs are similar to the ones u are going to pick from.

brentsz06

yep. richard does some amazing real world testing that debunks advertised information. great channel!

Rkreigh

you don't need a super rowdy cam with a modest 700-1000 goal. Easy to make the power, cam for the rpm range that you will spend MOST of your time driving. Area under the curve beats big HP and make a much nicer driving car.

If you are street driving, the cams job is to get those turbos spooled up with solid response

once on boost, the more mild cam won't hurt you much at all and you'll be making more power than you can hook anyway.

I'm no cam expert, but my last dr phil cam on the tiix twin turbo is spec'd pretty mild around .600 lift and makes a ton of power, 800 rwhp on 18 psi

Wish I knew more about the specs on it, worked very well on TT LS6 engine making 800 hp/trq at the tires on reasonable boost

the big issue to look at is that you stay in the sweet spot of the turbos for the rpm range you are going to run and don't choke off the exhaust side

go big on the downpipes. The huron kit goes full 3" which is what you need!!!


I wouldn't go big on the cam. the BTR stuff around stage II is plenty rowdy. But if you run the bigger turbos, and go for more rpms, cam accordingly!!

the turbos hit really hard and running higher rpms can help durability at the higher boost. sounds goofy, but it's true, take timing away at peak torq and stay away from any detonation.

I'm thinking of going 4.8 with lots of revs and boost to build a very broad power band from 2800 to about 7600 or so.

FourG63 97GST

in this scenario, the cam choice is decided by how you want the car to drive. a 408 with a huron TT will make a 1000 with any cam you put in it, from those tou listed, i'll go with the btr stage 2 .226/.231 .610/.608 113+4. Lsa, because prefer the drivibility and low/mid torque, the turbos will do the job after that

romandian

and why not "compensate" for a mild cam with rising boost? somehow the notion of keeping boost pressure constant has crept into peoples heads. look at a centri. in the end its a question of thermal management.

Rkreigh

boost by speed is the bomb!! you can't hook the big torq low down and ramping up the boost above peak torq will help the engine live

rpms and boost go well together. I still cam for the rpm range that keeps the turbos in the sweet spot. With a big displacement like that you want to make sure you don't choke off the exhaust too early and get the back pressure up too high

those turbos are big enough, just make sure you use 3" or bigger down pipes and a very free flowing exhaust to keep back pressure reasonable

romandian

yes, downpipes are key. on a 2.5l engine i once used a 4" downpipe going into a 2.5" exhaust for best results.

sirguy01

Down pipe and a/r exhaust housing size is key.

I still have oem modded ti on my car. She’s well into 4 digits.

I run the btr stage 2 tt cam with a 427, drivability is fantastic.

taintedsoul

how is the sound with that cam?

sirguy01

Oem Ti keeps it pretty tame. It’s really mild, if you are looking for chop this not the one. I was trying to keep this thing a little more low key.

I have a couple clips on my ig mugen.c5

Rkreigh

btr stg 2 looks very good I'm thinking of trying it out on 4.8 that needs to rev to around 7500 to make best power