what's the difference's between 42.5 injectors and 2.9 pulley vs 60 lb injectors and 2.6 pulley? whats the big differences in in hp and tq??

 

There is alot of difference between those two. For one 42.5 injectors arent going to take as much time to tune and get right then where at 60injectors are a little more tricky. 42s and 2.9 arent going to making as much power as the 60s and 2.6. Also the 2.6 is creating more heat, and spining the blower way faster.

 

Still can't decide, huh?

 

agreed ^^^^ more hp, tuning will be harder on 60's but if you are will to deal with and have the cooling and exhaust mods 2.6 ftw!!!

 

you wont really see that much total hp difference. but the lower and mid range hp will go up. but you will see a huge difference in your tq. numbers. the mid range tq is biggest difference.

 

what if i dont have anything to cool it or the exhaust? then should i go with the 42.5 injectors? i'm gettin a 2.5 inch exhaust in early summer...but not right now so thats why im trying to get some info on the hp and tq #'s for both of them...

 

If you don't have any cooling mods and no exhaust, then I would suggest that you stick with the 2.9 and 42lb. injectors. It will be much safer that way. There is a big difference between the 2.9 and 2.6 pulley though, it is something that you will definatly feel and is well worth getting as long as you have the supporting mods.

 

and which supporting mod's do i need other then exhaust?? and how much for the supporting mods roughly?

 

Supporting mods that you would need would include header back exhaust (may be able to get away with just cat-back), cooling mods (dual pass end plate, water/meth, and/or H/E), traction mods (engine/tranny mounts or traction bars or Ingalls dampener), and a tune (is a must for the 60lb. injectors). I'm sure that not all of it is necessary all at one time and I'm sure that there could be something that I missed, but that should really cover what you would need. All said done, exhaust/header/dp is about $800 roughly, water/meth is $400, dual pass end plate is $250, H/E is $100 (Cobra), engine/tranny mounts about $200 and the tuning varies. A new clutch would have to be needed eventually as well.

 

2.6" you might want to consider replacing your headgasket and studs because 20lbs tends to be the magically number to blow the gasket....

 

oh got damn...thats roughly $1650..is that usd or cdn?..lol i am gettin a torque damper in the next month and wasn't going to buy anything else till next year...do u think i should go with the gm stage 2 injectors and wait till i get the rest of the mods to get the 60's?? oh how much hp are ppl putting down with 42.5 injectors and 2.9 pulley? to the wheels and tq? there's someone i know running way higher then 250 whp and 220 wtq with stage 2 and water/methonal kit...but im thinkin the methonal kit is helping him a huge amount.

 

Fortunatly I'm not getting 20lbs of boost with my 2.6, but that is something else to look into. I also forgot you'll need the GM Stage 2 belt and a tensioner.

 

for the 42's or the 60's?

 

Thats usd. I would say stick with the 2.9 and 42lb injectors until your ready to take the next step to the 2.6 and 60lb injectors. With the 2.9 you would probably see about 250whp and 220wtq like you said. The meth will help a lot though in gaining performance, it is tuned for the meth you could see about 20whp I would think.

You'll need atleast a smaller belt for the 2.9 and 42's, both the belt and tensioner for the 2.6 and 60's. Unless you already have the GM Stage 2, thats the belt you need.

 

nah i'm stock right now, only thing i have now is the same as last summer, aem dry flow cai but i'm picking up a aem wideband this tues, and then i think ima stick with the 42's until i get the rest of the supporing mods...how much would a heat/exchanger bring the hp up by? so i know what i should be looking for next..

 

i was hitting 20lbs before i did the 3" catback now I pull 18lbs, but on the safe side i went ahead replaced it. plus in the winter i watch it hit 20+ instant

 

You won't gain much hp from a H/E, but it will drop your intake air temps. which will help in cooling the sc and engine down. I saw an 8-10 degree drop in temps., haven't dynoed it so not sure on the hp. I would say if you want to gain performance and run cooler, then go with the water/meth kit.

 

also to the dual pass mod and additional reserve tank

 

Same here with the winter months, but I usually see about 19-19.5, close to 20, but not quite there. I have the JBP cams going in today hopefully, so that would drop the boost by 1-2lbs. which would be great.

 

i thought the more boost the better b/c it shows most the tiime, that the car has more hp...so 42s should be good for the time being until i get the supporting mods? which will prolly be in a year? i just read on here that the torque brace/ingalls damper are good but not as good as switching the bushings....is this true?? and it'll save you more $$...sorry for all the questions but i want to make sure exactly which direction im going this summer..

 

someone chime in if i am wrong on this yes more boost is better in away, by adding exhaust mods it will lower your boost because the air is flowing through motor faster/better which is what you want

 

oh ok....but have u ever had any experience with the ingalls dampers vs motor mount?? im now 100% going with 42's for the time being and then who knows...

 

from what your want to do, i would just get the stage 2 belt 2.9 and 42's with a tune, do the airbox mod which will allow more air in plus the famous sc sound and its cheaper than an intake for the same performance basically. Work on getting your catback, then downpipe, then header. do your cooling mods before adding 60's and 2.6 or whatever you go with. keep in mind you will need a tensioner pulley with 2.5.

 

To run the 42lb. injectors with the 2.9 pulley you will need the shorter belt and atleast a "flash", which comes with the GM Stage 2, you can get that done at the dealership. You still need some sort of pcm update with the larger injectors. It would probably be better for you to just run the GM Stage 2 kit, it will include everything you need (except the pulley is larger) and will be covered under warranty (not sure if thats an issue for you), but you can always get the Stage 2 and get the Pulleyboys 2.8 pulley which is a direct swap and be safe that way (even though some will disagree).

This is true. Just becasue your making more boost doesn't mean your making more power. For example, a 2.8 pulley with stock exhaust may make 17.5 lbs of boost and 255 whp, but a 2.8 pulley with a 2.5" exhaust will make 16.5 lbs. of boost and 260whp. Thats the best I can explain it haha.

 

dampner or mounts i have not, i dont race car from a dig or anything so for me i am not conserned, I would probably do the mounts instead of the dampner. I thought read somewhere on the board, someone bent the dampner using a 2.5 or 2.6