im considering changing out my injectors i have a 99GP SE with a 3800 i have a wizardair box 85mm MAF catless 3"DP and plan on getting the injectors when i get the stage2 HV TB from ZZP here in a month. what size do you guys recomend and how could i figure out what size i need in the future

The next step up is 42.5# injectors but don't waste your money dude, you're not even close to maxing out your stock injectors.

Buy the powerlog you want instead.

its a N/A 3800 dont they come with 22# the S/C 3800 has 36# or am i wrong

yeah your correct, you could upgrade to 36, but with your gt your not maxing them out yet, get some other mods, heck you can even run the gt inj with the ssm90 kit but you have to run a 4.0, any lower and you need 36, but yes dont worry about them yet get some other mods, heck top swap and intercool then u can run dome 42's

Oh, sorry, you are right. L67's are 33# injectors actually.

I still doubt that you would be maxing out your injectors already though.

You're not maxing them, don't waste your money

ok then and am i following the rightpath by cleaning up the intake and exhaust b4 i dig into engine internals?

Yup yup, you are going in the right direction.

Plan on going boosted at all? If you are thinking about dropping an M90 on there, skip the TB for now because you won't be able to use it.

But if you go turbo, that thing will work wonderfully with it.

Also, the 3800's have a rock solid bottom end. ZZP's got a twin turbo, 700+ hp drag car that runs 8's in the quarter and it's on a stock bottom end.


EDIT: You may want to drop some colder spark plugs in there and a colder thermostat if you haven't already.

i have ngk tr55 and i want centrafugal superchared and i just installed my drilled 180 tstat today in the snow. i do have a question on the valvetrain though i want zzp's gt1 cam but i also want different rockers which one should i get first and whats the largest rocker i could use with the gt1 cam? i know that the 1.9 wont work.

I'd suggest you stay wwith the stock 1.6 rockers with a GT1 cam ,there is nothing wrong with our rockers spend your money on more usefull mods.Chico(pops)

If you are going centrifugal, don't bother with a GT cam. Do your research before buying the wrong cam for the wrong setup.

charging it will be the very last thing i do changing a cam isnt too bad

Have you ever done it?

no but a shop can do that for me i cheat on the hard stuff if i can besides its gonna take alot of dough to do a custom setup for the charger so thats why im putting it off till i got everything else beefed up mainly the tranny

So you're willing to spend $700 bucks so your GT can run a mid 14, instead of saving the money and putting it towards the CSC and your beefed transmission?

see thats what im asking if i should skip the cam and get rockers first but also whats the largest rockers i could use now and with an aftermarket cam

Depends on the rockers and what cam you choose. Don't bother diving into the valvetrain until you realize what you want to do to the car. A cam will be fine enough without rockers. You need to decide on which cam first, and what your setup is going to be.

If you go with a GT2 cam or something, you cannot use high lift rockers. Same goes for boosted cams. Some guys run a VS with 1.7's on the intake side, but that is as high as it goes. The XP sticks with 1.6's.

ok then do you have ny idea where i should start looking for a centrafugal S/C setup

Zuul has the Novi kit on his car, and has been really pleased with it (as far as I know). He hasn't been around in a while, but you could PM him for some details. I have never dealt with one, I went with a Top-Swap instead.

ok thanks and i think i was talking to you about the TB spacer and the gasket from easyperformance i just installed the gasket and did a 60 mile round trip doing 80 when i got home i left my gp running and put my hand on the TB and it was cool to the touch my water temp gauge read a little over 180 at the same time

is it possible to replace the gen3 m90 with the gen5 version?

Yes, your TB will be colder, but JB welding the hole shut will accomplish the same thing.
Or you could do it the better way: http://www.grandprix.net/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=1;t=010841#000000

I just JB welded the hole, though.

yes but you need a different LIM than the one you have.

i have a n/a 3800 im just wondering if i could go straight with a gen5 now that ordonez got me stewing over whats next THANKS ALOT!!! jk lol

yes, as stated you will need a modded LIM... I'd suggest searching for more information.

ok ive decided way down the road i want a CSC kit besides a beefy tranny what else should i plan on getting b4 then

With the basic CSC kit, you won't even need a beefy tranny.

The VS cam goes very well with CSC too.

If I were in your shoes, amcsocold, I would sell the wizaired, MSD packs, and PCM. Call ZZP and see how much it would run for a novi 1000 setup. You can run GTP injectors.

i got the msd cause one of my coils went bad the wizaired box is sold and the pcm is custom tuned now

ok. well you won't need that particular custom tune or the wizaired with a turbo or centrifugal supercharger.

since this thread is about inj sizing,

what do people think of me upgrading to 42.5's i will be IC'd as well very soon and i just want to make sure im going to be able to drop pulley soon

do you really think that can max out your injectors ? how much horse do you think youll have ? what pulley ?

42.5's are a good idea when you start getting into the 3.1-3.0 pulley range. Some cars are different, and the only way to find out is to tune it afterward. I wouldn't worry about it until you get into that pulley range, though.

even with the gen v? becuase i got a 3.6 now, but i will be going intercooled now and i plan on dropping down to a 3.5/3.4 yes i am only going to be using a ssic but depending on how i like it i really want to go with a fullsize ic, but i dont plan on going any further after i get intercooled

no need to upgrade injectors until your scans show you maxing the ones you have.