CammedC6520

Hey guys got another question I was told a big cam is bad for track racing. Just because of the lift on the cam at high rpms puts allot of stress on the springs. and had people suggest not to go with this cam for That reason. I will track maybe once every month you think I will be fine?

Change springs every 8k miles?

lt1z

Do you mean road course events by track racing?

CammedC6520

Yes sorry should have been more specific, I thought track and drag strip were different. But yes like auto cross I don't plan it more than once a month or every other

v8sten

i drove the **** out of my car every weekend on the streets of mexico and drove it every day with the 1st generation of that cam. i didnt have any issues, but i like a nasty cam.

traction out of the corners will be an issue

silver z06

lt1z

Well Auto-x is a bit different then 20 minute road course sessions but either way the BTR4 cam is more for the drag racing crowd.

CammedC6520

I'm pulling my whole drivetrain and engine when I get my lift to look over everything. What cam do you suggest for everything roll racing drag track and auto x

CammedC6520

Video isn't playing for me

v8sten

how about now.....

if not then copy and paste this in the YouTube search....

Z06 vs ZR1, Viper, C7, Motorcycle & C6

CammedC6520

I'll look for it but I'm
Still looking for a answer on if this cam
Is to big to track once every other month

MTPZ06

Its a power-band thing...BTR 4 is top end. Can you Auto-X with it? Sure. Are there better cam choices that would be far better suited towards that application? Absolutely. Will those cams leave top end HP on the table that you wish you still had at the drag strip? Yep

I'm sure you can find a happy medium out there...but I would figure out what is more important to you (Drag vs Auto-X), and lean towards the cam that best suits the majority of your intended use.

You could always have Kohle spec a cam for you if your sending your heads back to him for porting.

CammedC6520

I am I just don't want that downgrade of less power I might have a new cam specd out how come I see cams producing 550hp and trq is dman near the same I feel like that's a good cam. If the flow through the chart is good and this btr4 is crazy I waste allot of gas i might or am going to cut down to a smaller cam.

MTPZ06

I'd say stick with what you have for now...you're doing all supporting mods that the BTR4 needs to shine. Porting the heads, MSD/NW combo. Those were the missing pieces to your combo. You'll probably pick up another 50 rwhp after a retune by adding those items.

Then you can make a decision about the Auto-X vs. Strip thing; because right now, you're not getting the full benefits of that cam.

CammedC6520

You are right, I will decide to change it when I hit the 10k mile mark on the springs. I was told this setup will not last me long on stock bottom end making 580-600whp is that true. On auto x and drag and street?

MTPZ06

Depends on use and how you treat the car. Of course running the car hard will shorten the life expectancy, but just make sure you're doing all the common sense stuff. New fluids after so many events rather than actual miles. Blend some 100 octane gas in with your crap 91 CA stuff, or at a minimum adding Torco to your fuel. Maybe even look into an Alky kit. Detonation under load is no joke on these cars...super easy to crack a sleeve or shatter a piston if your fuel isn't on point. As long as you're smart about it, it should hold up...but hey, things can and do happen.

CammedC6520

Thanks for all the information, how do you know if detonation is happening?

CammedC6520

I might just switch over to e85 full time buy a 55 gal drum

MTPZ06

The car will pull timing if it detects knock/detonation...but if you're WOT trying to break world records, it may not react quick enough. That's what I meant by under load.

That's a good option as well if you don't mind having drums of fuel at your house.

v8sten

BTR Stg 4 power band is from 3500-7200

BTR Stg 3 power band is from 3000-6600

I have done a direct comparison in between the two, as a good friend of mine is running the Stg 3 cam. we both made the same power, his was just in a lower rpm range. on a 60-160 roll race we were dead even at 160.

So it all depends on where in the rpm range you will be most of the time when auto crossing.

fyi both cars were north of 600 rwhp

CammedC6520

Yeah I made my decision full e85 I'm also milking it another .060 by ahp maybe if the power gains are worth it I don't want to fill up every two days. But what injectors should I go with? I'm looking for a decent set up but the cheapest I'm on a budget.

CammedC6520

Ehh I'm staying with the stage 4 for now maybe down the road down size to a stage 3 once my 10k miles are up I'm going to e85 though. Hopefully hitting 600whp