Hey all I'm doing my intake/throttle body on my c5. I decided on the Dorman 90mm intake but not sure on the throttle body yet. There's so many aftermarket ones out there and I'm not trying to pay 600$ for a nick Williams so anyone used others? I've looked at a few online that are a lot cheaper but what's good? Also read that stock gm 90mm won't work on an ls1 because the TAC reads a different voltage?... wanna make this happen soon but don't want to play the buy/return game... thanks for any input

 

A silver blade LS2 throttle body with an adapter harness will work. You will also need to update the tune in the computer. You will not see significant gains though until you swap the cam and install headers to take advantage of the additional air intake volume.

 

Thanks for the response. I want to do the cam but it's out of my budget right now unless I do it myself... I've never gone internal on an engine so kind of afraid to make a mistake and ruin my engine. I've done heads before on older engines so could do that part but 4000$ for a cam swap is just too much.

 

would I get at least a decent boost and throttle response with the intake/tb upgrade?

 

No.

 

Ok so my only options for the next step is cam and heads? Was thinking about maybe just going straight to a blower or turbos if that's the case.. would be about the same $

 

Dorman intakes lol you got to be kidding right ? I bet your stock inatke performs just fine . Leave your Tb alone also they can handle much more air flow then you think . Your not gonna make any power adding a inatke and Tb to a 90mm If your desire is power get your check book out .

Fast LSXR inatke. 900.
Heads .1500-1800
Cam - 200-300
lifters - 200
push rods -200
Valve springs -200
Throttle body 102 mm 900$
Get some boost 5-7k depending on what ur taste it is
I’m sure there’s a whole lot more I can put on there but unless your will to spend oh 15k or so it’s no use trying to make power . 2nd option get a done 454 stroker and slap that in either way your prob looking at 7 on a new motor plus install so ya either way it’s a small fortune. Plus tuning after all that lol another what guys 1k on that ? 300 for a device plus credits plus a nice 500-700 or more tuner fee . So really I’m just saying before u go down the road sure the power is fun way more fun...but it does come with a cost not only your wallet , but time and the maintain end other things will need as well like pulleys belts power steering pumps , clutches all these factory parts will not hold up for any pro longed period of time especially boost or making some high hp.

 

Wow, Negative Nancy, you really rained on his parade!

I guess what Speedy is trying to say is, "it's going to cost twice as much as you think it will" and he ain't wrong, considering the associated increased costs of peripheral improvements you will want to make to stay on top if the car.

Although I do disagree with his statement that you're looking at $15k to begin with.

I think you can generate serious improvement with $4500 - intake, exhaust and cam will net you what - 60 -75 HP? You will need a tune.

At that point you should consider endlinks, shocks, maybe springs, brakes, wheels and tires, then urethane bushings (in that order) before you jump into the boiling hot springs of forced induction.

Don't forget your stop in the languid pool of drive train improvements beforehand, as forced induction will take a toll on worn and underbuilt tranmissions, clutches, gears, and rear-ends. Cooling needs will make themselves known at that point too.

All of that silliness will result in a hard-driving, brutal monster of a car wholly unsuited for driving on public roads. Such a car will be liked by few, really, only the idle rich who seek thrills on long track days will be attracted to it. Good luck selling it!
ETA: I have done this myself. Once. It was an ordeal, and I got lucky with a nice little forced induction go-kart that was amazing, but which did not command nickle-one in increased value. About a year after my highly customized dragonslayer was out of my hands, the fellow who sold me most of the parts and installed all the suspension and forced induction gear told me it was in his shop for a comprehensive engine rebuild.

I guess I used much of the life of the motor @14.7 psi, LOL.

 

I ain’t afraid to let it rain on my parade broooooommmm hahaha. Sorry I didn’t mean to burst a dream but the truth should be given up front .


Common serious hp 60-75???? No where in the ballpark of fun...300 plus ponies now your speaking my language.



What the meaning is your going to spend what you prob paid for the car and more modifying it .. the bill sucks indeed ...Rome wasn’t built in a day .


Hell I bet ya a compounded electric turbo get you some nice boost at a low cost ..it would seriously rip like 500 ponies one stock stuff 7lbs of air . Quad electric a twin compound lol for about a grand 14 lbs of boost you will need some booger injectors and way to control the electric boost module . Or else it will be like straight extreme steroidal nitrous when all the boost hits at once you’ll go flying ....

 

OP, do you have headers? That would be my first mod, is it auto or stick?

 

Lmao no worries and I appreciate truth and experience that's why I'm here so give it to me straight Docs 😅 So far I've done 1 7/8 headers, 3" catless mid, b&b bullets (love the sound of it), and vararam intake. I have a buddy that tunes and we've done a street tune and it's running great, he also can help me with the cam swap (never done that but I've been wrenching my own stuff for many years). It's a 99 FRC 6 speed manual with Z51 suspension from the factory. It's really fun to drive don't get me wrong I'm already happy with the performance.... but.... if I can do a little more and not blow it up I'm game. I did trade labor for half the cost of the car so I really only gave 7 for it and some hours of my time

 

It will handle 700-1000 and not blow up the stock bottom end top end on the other hand top end will need some strength.

 

How many miles are on it ?

 

WOAH, easy there, Speedy! You are clearly boost-crazed. It's a verrrrrry contagious condition. I've had it. It's pretty virulent, and once you catch it, it's pretty tough to shake.

Try not to give it to the OP. He seems like a nice sort, not one you'd want to make sick.

 

I have a fully built car but my advice is to just start out simple, you already have the exhaust and someone to tune it so I would just do a cam, of course everything you’ll need to install the cam, maybe go ahead with some bigger injectors then you’ll be ready down the road if you decide to do heads/intake and I would also do some 4.10’s, just doing the cam and gears will wake the car up alot, once you start modding then you’re going to have to have things like a better clutch ect, it starts adding up quick

 

Let’s not leave out the aero dynamics after he gets there ....you will need to have the car adjusted to sit lower and pull less air scoop slowing ya down . Oh the 17&18’s are nice but let’s face it the road bumps are gonna take out out the front end skid . Adds some bumper wheels . You need a big *** rear wing wing and some slashes in the hood graphics with a skull hitting a glass pipe lol smiling .


Ya I’m gonna my take horse the ol town road....let it til I can’t go no more lol yup !!!! J/k

 

It's got 92000 on it now but it's been well taken care of everything is tight. That's kind where I'm at wanna keep it simple to an extent and I know the further I go it gets addictive and expensive. I'm thinking the cam next just because it's a bigger job and better do it while I have help and a lift to use lol but then I think the intake and throttle body and then the heads after that I'm stopping as far as the engine goes I'm not gonna track it just want it quicker and be able to at least hang with the cars I race on the street (forgot how often it happens driving a car like that) 😁

 

All you need is some forced induction....and rebuild the heads .

 

Do a cam with new lifters of course...DO all the stuff while you're in there kinda stuff... Either spend some money on your heads or get some worked on 243's..
Or aftermarket if you have the $$$... Don't go crazy on the cam... it's only 347 CI... And you'll want to drive and enjoy it.
DO do the rocker arm upgrades, valve springs, retainers and seals. Do a new (better) harmonic balancer as the oem ones fail.
Do all the little cool things that will give you smiles per gallon.. Don't chase some stuped HP Number: it's just a number...
You would enjoy deeper rear gears ALOT !!
A stock LS6 intake manifold is a great choice or even the dorman LS6 replacement- it's kinda in the middle of the 2 intakes.
You wouldn't need bigger injectors IMO unless you are really going to cam it up and spin 7K... Make sure your fuel pump is right and you've changed
your fuel filter/regulator assembly...
You will find all sorts of "little" thing "while you're there" to improve your ride.. Remember, your plastic - rubber - wiring -etc are all over 20 years old now