using 1 or using 2 you are going to see a gain either way. Cooling mods are a great thing to do to these cars. We heat soak soooo fast that without cooling mods, it doesnt matter if you are stock or have a 2.5inch pulley, without the cooling mods, your first pull will always be your quickest.

Cooling>power. You have to do things the right way, and hopefully people will realize that.

If you plan staying with the m62 supercharger, then grab all the cooling mods, then start upgrading the injectors/pulleys.

 

let me know what #'s you put down on that new set-up! i should be going to the dyno soon as well as soon as it cools off a little anyways

ohh and keep an eye on your iat-2's, theres been lots of pump failures lately

 

my interceptor is always set for iat1 and iat2, however i change it to misfire/knock every now and then and do a hard 2nd gear pull. Thanks for the tip though.

july 22nd i am getting tuned for the 60lbers and 2.8inch pulley. Although I might wait until august and have hahn racecraft in chicago tune me instead. Not sure yet. Currently I am around the 260-270whp with dyno sheets to prove it and that was before the heat exchanger on a stage 2 tune. Some say my dyno might be happy, and it could, but I would rather not get into that =P.

 

I wondered that too... but is the pump strong enough to push coolant through two heat exchangers??


Nice clean install looks good..

 

listen to what you said and think about it................................................ .................................................. .................................................. .................................................. .................................................. .................................................. .................................................. .................................................. .................................................. .......umm i think you should wait... theyll get you a real 260-275 hp reading maybe 280...not the inflated #'s someone is telling you now, im sure you've been around long enough to know its close to impossible (but not) to make those #'s on a stage 2 tune... put it this way...

can you do rolling second gear burn-outs just by mashing the gas around 3-3.5k rpm??? if not your not making those #'s...

i know you said lets not get into it but, thats just asking for it representing those #'s on a stage 2 tune hahaha lol no offence its just i think you even know those are inflated by at least 10hp... my point is hanh ftw!!! sorry if you've heard all that a million times

 

I have heard that the dyno I am using HAS to be inflated because theres no possible way I could be putting down 260-270whp with the stage 2 tune. I might have hahn do it, I might not. Haven't really decided yet. It just all depends.

To answer your question though, no, I can't do a 2nd gear burn out by mashing the gas. Although I do have a traction mod

 

well actually i was thinking about it no one can on the stage 2 tune cuase the torq abuse modes are still on so it wouldent let you anyways, ever launch hard and the car falls on its face for a second then takes off?? thats torq abuse kicking in.... and another thing is theres a 12.5lb boost limit so its pretty much pointless to put anything smaller than a 3.0 on unless you just want more boost sooner but imo it comes on pretty quick with just stage 2 pulley

go with hahn you WILL NOT be dissapointed they have been tunning forced induction engines for a long long time...im sure your other tuner is just someone with hpt?? wait for hahn, im sure the toss up is cause of the price diff? wait and save up thats speeking from experience with canned tunes and street tunes

hahn has a load based dyno im sure, and they will get you the best results period.

 

if theres a 12.5lb boost limit.....why am i hitting like 15lbs of boost on the stage 2 tune?

 

Stage 2 ups the boost limit to either 15 or 18 I can't remember which

 

http://www.zzperformance.com/cobalt_...=755&catid=144

The features are similar to GM stage 2 PCMs with about 20 additional changes made.



Speed limiter removed
Raised rev limiter to 7200
Altered fan turn on keeps the IC radiator cooler at all times
WOT fueling is revamped to provide a safe, flat air/fuel ratio at all RPMs
Works with high flow cats, 420 code removed
Torque abuse modes are modified to eliminate bog during WOT
12 PSI boost limit is removed
Timing revamped for increased power
MAF/MAP tables adjusted for running smaller pulleys
Idle hunting from installation of larger injectors improved


i always wondered that also and figured the gauge goes off the map sensor which is on the manifold so if it says 15 its gotta be getting 15...

i was speaking from what i read above on my first canned tune, but now that i think about it that is probably stock setting, but seems kinda silly for gm to warrenty stage 2 cars that are pushing 15psi all day on the stock cooling system which cant even handle stock pulley when pushed hard (ie autox)

so i think your right cause i saw like 14 way back when i was just stage 2

15 sounds right cause even when i had a 2.8 it wouldent go higher than 15 it got there instantly but never went any higher

 

i instantly hit 10lbs no matter what gear i am in if i mash the gas, but i can see as high up as to i believe 16. This is also on a reliable mechanical boost gauge, not the stock crappy one.

 

huh maybe one of the tuners who works with hpt and has seen the stage 2 tune will clear this up for us?

 

the stock stage 2 tune can't have a 12lb boost limit, theres no way. When my car left the dealership after getting the stage 2 tune, i was hitting 15lbs of boost at 7k rpms.

 

no not 12... 15 see post 59 im not arguing i may be wrong i dont know thats why im waiting for some one to clerify

 

if there is a boost limit, its probably 15.

 

...i need to learn how to use hp-tuners... :S

 

Getting the post back on track concerning the install of a heat exchanger... I decided to make a new diagram for the LSJ Intercooler System Plumbing with Dual Pass Endplate and Secondary Heat Exchanger.



Everyone seems to never want to route the hot coolant through the IC Pump in their diagrams, however this is how GM tells you to do it when installing their Dual Pass. This is the routing I have with my setup using a ZZP Dual Pass End Plate (No Option B) and a CX Racing H/E. Please discuss...

 

I am 100% sure the boost limit is raised on stock stage 2 tunes and I'm 95% sure it's 15psi

 

If you are only running the stage 2 pulley AND have meth + the cx h/e your iat2 shouldn't see 160 except in extreme conditions. something isnt adding up here.
i have no cooling mods and run a stage 2 pulley (60# injectors) and i barely see 150

is it true that running the stock h/e inline with the aftermarket one will burn out the pump?

 

I don't see why it would. It can only pump so much coolant reguardless of how much you have in the system...

 

so was this almost all bolt on hip?

 

Don't have hptuners, but i hit 16 or 17psi pretty often and I've only got the stage 2 tune so it's gotta be 18psi limit. I'll get pics if you need.

 

yea, i am pretty sure if there is a gm stage 2 boost limit that its higher then 15 because I have seen higher then 15psi.

Also there is nothing wrong with seeing 160degree iat2 when doing 3 1st to 2nd to 3rd to 4th gear pulls in a row.

I was pushing the car as hard as it would go, redline in 1st, 2nd, 3rd, and shift to 4th, slowed to a stop, and did it again. Did it 3 times and the car did not pass roughly 160 iat2.

Thats perfectly fine considering it was 91degrees outside and that was 3 very hard pulls in a row, no stops.

 

Wow, you're supercharger is so clean. lol

 

haha, I thought the exact same thing when I looked at those pics! I really need to pull mine and polish it, it would really bring the engine bay alive.