Trying to make a decision on my friends pulley size. He runs his car everyday with 65000 miles on it. He has an h/e for cooling so what will be the best bet? 2.8 and 60's or 2.9 and 42's? Any input?
Thanks

 

Most would go 2.8 and 60's

 

Either setup will be fine if tuned.

The 2.8 & 60's will give you more room to grow though.

 

Any usual problems with this setup? Its his only car so can't be down.

 

A 2.9 is pushing it on 60s, I'd go the safer route and go 60s. If you're going 60s, you might as well put the 2.8 on it.

FWIW, I daily drive my car on a TVS with a 2.7 pulley, 80# injectors, and almost 80,000 miles on the car and it's fine. As long as he doesn't drive like an idiot, he'll be fine.

 

Cool. Its going to be the zzp canned tuned for a while until he finds someone good with hptuners

 

Just me, but I would never put a canned tune on a daily driver. Chances are it'd be fine, but just saying, if it were my car that I was relying on for daily transportation, I'd have a tune lined up before I bought the parts.

 

I thought canned tunes are safe? I though I heard that from a few people.
Also witch would be better an smaller belt of oversized tensioner?
Thanks alley

 

i ran 42lb with a 2.8 and of course people well start freaking out that i did. but im at a way higher elavation 6800'. but i relly didnt have problems with it. im not for sure but i think u well loose more gas with 60 but more power. i havent researched but there use to be a problem with the 60 at idle, it seemed to be very bouncy. IDK if this was fixed or what, but just letting you know what i thought. FYI when i had my 60 with 1 injector Fed up i pulled about a car and 1/2 on my buddy 09 GTi. when i switched to 42s i barely pull a car on him. so 60's are nice but 42 arent bad.

 

Canned tunes are "safe"

Sometimes too safe!! Meaning they run very rich. Bad for performance, and can lead to fouled plugs and other issues.

I would get a nice custom tune for sure. As for the belt or tensioner, I would go with the belt.

 

I wont freak out at you. I've pushed 42lb injectors very far as well.

Many factors lead to maxing injectors & their pulsewidths / IDC % (elevation, temperature, how rich or lean the tune is, rev limit, etc.).

But for someone starting out they should just get 60's so they have more room to expand power wise.

 

I would just go 2.8, 60's, and get either hpt or trifecta. Why throw money away on a canned tune when he already knows he is gonna change it. I would also get a dual pass or single core if he wants/can spring the money for it. Also get a smaller belt.

I have been dd mine on a 2.8 for 2 years. I drive my car hard and everyone I know will vouch that I do. compression is still 190 across the board with 68k.

 

Well the canned tune comes with the kit anyways so why not right.
Thanks guys I think 2.8 and 60's is the best bet

 

"Lose more gas" = slightly worse gas mileage, but an intact motor. 42.5s simply can't flow enough fuel high in the RPM band, generally speaking. The idle bounce on the 60s was fixed a couple years ago, any good tuner should be able to tune idle smooth as butter.

Simply said, 42.5s are WAY beyond max IDC on a 2.8. Daily driving where your RPMs aren't going crazy high probably wouldn't cause a problem, but if you ever want to get on it, especially if you do it often or drive at a sustained high RPM, you're running the risk of the injectors going static, causing an extreme lean condition, and blowing the motor sky high.

Have people run 42.5s and a 2.8? Sure. Is it a good option for most people? No.

Yep. There are a lot of variables that go into a tune, and a canned tune pretty much assumes worst case scenario and plays it safe. They're usually tuned with the assumption that the tune will be run in the coldest weather, at or below sea level plus a little extra fuel just in case. But like Staged said, it tends to run very, very rich. Lean is what blows motors, but rich comes with its own set of problems.

I'd also go with the belt.

 

You're still paying for the tune. It's not exactly thrown in free out of the goodness of their hearts. And you'll be paying bare minimum $100 for the HPT credits to "fix" the canned tune. It's really up to you/him in what you want to pay for.

 

Yeah your right. I think he wants to get it going so he can go drive somewhere to get tuned. Like out of state somewhere. It is a waste of money but there is NOone around here that has experiance with cobalts

 

That sucks, but you gotta do whatcha gotta do. I'm lucky all my tuning is done in-house.

 

Also can hptuners still tune the zzp pcm?

 

Pretty sure it can. Is there a core charge on the stock PCM? If not, just hang onto the stock PCM and tune that one if you can't tune the ZZP one.

 

$175.00 core on it.
Is trifecta good **** you think?

 

Yep it can

 

For $175 definitely send the stock one back, LOL.

If you can't find a tuner, Trifecta isn't bad. I don't like the idea of long-distance tuning, but it sounds like that's what you're going to end up doing anyway. With everything HPT has unlocked for the LSJ, I personally would go that route. BUT I also live with one of my tuners , so that makes a difference.

 

This was a good question to ask OP. I DD my car and have thought the same thing. I think I'll go 60's and a 2.9 though.

 

I had my 2.9 on for about 3 days before i ordered the 2.8, lol

 

2.9" on 50's or 2.8" on 60's?? both setup with cooloing mod ( dualpass+obtionB and heat exchanger) what is the most safe?