Want to Turbo my 3400, need help/opinions

[Niteflight]

Will use an intercooler for sure, I don't want to be without a car for a while, thats why I'm trying to play it as safe as possible.

[gectek]

well im going with a custom grind from the store, just working on the profile right now, but i think the ls6 springs will be ok

[AaronGTR]

even if not running a larger cam, if you re going to boost, you need better springs. Period. They will not be able to follow the cam profile under boost.

Who here used stock springs under boost and started getting float as early as 4500 rpm?

You need something better though then stock.

Wrong. That depends largely on how old the springs are and how much boost you are running. I ran 9psi for years with a stock cam and stock valve springs and I didn't see power fall off on the dyno until 5800 rpm... the same place power drops on NA grand ams.

[AaronGTR]

yes, and dont forget to use an intercooler. the guy that blew 2 motors , from his pics it looked like he had it plumbed right from the supercharger to the intake, thats a big uh oh for detonation.

Jake

Well, an intercooler is definitely a good idea, but it had nothing to do with why he blew two motors. It was because he had the rsm setup that deleted the MAF sensor and he didn't put it back in like we told him to. That's why he was getting detonation, because he wasn't getting enough fuel, not because of the intake charge temps. He's not running that high a boost level.

[Niteflight]

Well the engine has around 70k miles on it, and I really don't want to spend money in areas that wont make a difference, I'm just debating over to get the ls6 springs or not.

[gectek]

ls6 are the best for the price i think, but you could use the 3500 springs without any need to change anything, just take the old 3400 springs off and use the new 3500, i think it would be the least cost and least amount of time consumed.

[Niteflight]

One last question.

TGP exhaust manifolds with the turbo cross over and downpipe will fit correct?

they should bolt up fine to the 3400, and there is room for everything?

[AaronGTR]

Yes but the ports overlap the 3400's D shape at the bottom corners. I ran gen 2 manifolds on a 3400 for a few months w/o problems.

you can round out the transition at the bottoms and port them open a little more.. you don't want to go too much, that cast iron can crack pretty easy if you give it a weak spot.


I have my old ones somewhere, my shed is iced over right now but if it warms up this week i'll see if i can grab a closeup of the ports.

the overlap is minimal.. it's like 2% of the total port.

Think that answers the question of whether they'll fit on a 3400 or not. It would be better to get something larger with port sizes that match exactly but... hey, they'll work and they're cheap and easy. As the downpipe fitting, I highly doubt it since it was designed for a different chassis. You'll be able to use the turbo manifolds but the downpipe will have to be custom. Not that hard or expensive.

[Niteflight]

I'm getting all those things for $350, I don't know if its good or not but IMO its worth it, I'll try the downpipe, but the tgp was a W-Body and so is the Impala, I'm keeping some faith with the downpipe, hopefully it works.

I was more concerned with the turbo being in the way of the throttle body, but I guess not.

Also, would the EGR need to be blocked off?

[Niteflight]

Does anyone have a pic of were the injectors are located on the 3400, and what the harness looks like, thanks a lot.

[Guest]

Sorry aaron your wrong. If you are making more power and still using the stock springs you can create float.

People here have done it for crying out loud. by going to differnt springs and nothing else that corrected teh problem.

So don't sit there and tell me I am wrong. People here have dynoed it and even said they could feel it when driving.

One needs larger springs if boosting. Maybe you don't but you dont' have a good setup to begin with so its no wonder.

[AaronGTR]

Sorry aaron your wrong. If you are making more power and still using the stock springs you can create float.

People here have done it for crying out loud. by going to differnt springs and nothing else that corrected teh problem.

So don't sit there and tell me I am wrong. People here have dynoed it and even said they could feel it when driving.

One needs larger springs if boosting. Maybe you don't but you dont' have a good setup to begin with so its no wonder.

Yeah, whatever. Sit there and blather all you want but you can't prove it and you have no experience to back it up. How many boosted 3400's have you worked on again?... yeah thats what I thought. STFU and go bother someone else you poser.

[AaronGTR]

Does anyone have a pic of were the injectors are located on the 3400, and what the harness looks like, thanks a lot.

Um, the injectors are between the fuel rail and the lower intake manifold, underneath the upper intake manifold. I would've thought you'd know that already.

This is a pic of my fuel rail with 42lb injectors and my moddified harness with bosch connectors on it. The part with the red wire loom on the left goes to the main connector, the one coming down from the middle is the MAP sensor lead, and the two on the right side are the cam sensor and coolant temp sensor leads.

[Niteflight]

Yeah I can't believe I didn't know where they exactly were, guess cause you can't really see them.

So the only thing that needs to be removed is the upper intake manifold? Will I need any gaskets for it possibly?

[Guest]

Dude I have talked to people that have boosted their 3400 aawrongs, and they needed stiffer springs. But then again they weren't running crappy magnuson kits on 9 psi only making a measly 230 whp. They were making over 300. So thats probably why you have gotten away with stock springs. You just aren't making any power. Your setup is horrible.

To answer the question. Get the ls6 springs. You will need them. So get them and be done with it.

Now aawrong, take your slow poser car back to slowsville. Thanks

Oh yea, didnt' the Berretta pace car have a custom stroke crankshaft? Oh thats right you were proven wrong on that. By me.