Ok guys I finally made it over to the shop today to put on this stuff and tune the car - which by the way is my girlfriend's 06' Sunburst Orange SS. The car is 100% bone stock except for the airbox modification with the Spectre filter in the stock airbox (see "airbox modification" in the how-to section for more). So today we put on the Billetflow 2.7" pulley with the Ford green top 42# SVO injectors with the new wiring harness. I used the shorter Stage II belt from GM with the 70mm idler from Billetflow to ensure zero belt slippage under WOT. The NGK BKR7E spark plugs were installed at .035" gap, which is about what they were out of the box.

I did not dyno the car stock, although it ran about 12.5psi boost at WOT with just the airbox mod. The bad news is that it was like 105 degrees here today, and we have that terrible ethanol gas here in the Dallas/Fort Worth area that seems to be moree detonation prone in this heat. The coolant temps were fluctuating from 200 to 225 so it affected the ability to tune the car for maximum performance without getting knock. I have my own HPTuners and have used it extensively so that's what was used to tune the car.

I couldn't run more than 18 degrees timing at WOT without getting some knock - even though it was minimal at 1-2 degrees intermittently through the dyno pulls. So the car ran 239whp in extreme heat on 3 final pulls back to back. I got the A/F ratio completely flat at 11.7-11.8:1 from 3,500rpm all the way to 7,000rpm where the new redline is. I did pulls in 3rd and 4th gear all the way to redline and even on the 4th gear pulls it held the A/F below 12.0:1. The boost was running 18psi all the way too! So these injectors were enough for this size pulley without question. I'm not sure if I would go smaller on the pulley than this with the 42's, but I also know that running A/F ratio's above 12.0:1 will likely hurt the longevity of the motor with this much boost on it.

I anticipate once I get the exhaust on it (stay tuned) and a real intake, and once the weather cools off a little I'll be able to retune it for ~ 22 degrees timing and should be hitting around 260whp fairly easily. All in all, I am very happy with the quality of the Billetflow pulley and how it mates up with the 42lb injectors. I'm confident even at 260whp the 42's will be at 12:1 A/F all the way to 7,000, but of course I will keep you all posted on things.

As for SOTP improvement - it is night and day. The car runs much, much harder and I'm ecstatic with the results for the small amount of money spent. So don't be scared - go with the smaller pulley and you will be thankful. If you have any questions then post up and I'll try to answer them

Chris

 

very nice write up, i need a tune!

 

Good write up bro! I have the 2.7 with 42.5s, its a nice setup!

 

so with a tune a 2.7 is ok then right guys?

 

Yes that is correct! Although like I said they are close to tapped out at that point. I think any pulley that won't fit without machining of the snout will be too small to run with the 42's - at least safely IMO....

 

It is perfectly fine, to max out these injectors you would have to be at 120% duty cycle, i have the 7k redline also, and the 42.5s and 2.7 work just fine.

 

ok so wat do u guys suggest then, im getting my car tuned with my 2.85 in the next few weeks, now if i swap to a 2.7 do i need additional tuning or am i good just to slap it in and harp on her?

 

It wouldnt hurt to get it re-tuned, your going smaller so its going to throw some things off and adding more boost, it would say sell ur 2.85 get the 2.7 and get it tuned with that.

 

just ordered a 2.7, thanks guys!
1 more question, i have the stage 2 belt, that should still be tight enough for the 2.7 right?
also, the charger wont be maxed out will it since this set up will be used for daily driving all year round?

 

So what do i do after i get my stage 2.... im planning on getting a pulleyboys 2.8 afterwards. Do i just walk into the dealer like i own the place and tell them to hook it up to a tech 2 and tell them to reflash it for me?

 

i keep reading that a 2.7 pulley requires 60lbs injectors, and then i read that you dont need them, im just a lil scared tp tune with this pulley unless i have concrete facts.

 

Ok guys, YOU DO NOT NEED 60LBERS WITH THE 2.7 PULLEY, also the blower will not be maxed out, iam at 19lbs safely with the set-up in my sig, i have done test runs over and over again with hp tuner's the injectors dont come close to being at the top of their duty cycle even at 7k redline, which is 120% is maxed out, you can run a 2.7 with 42.5lbers fine, is a suffiecnt amount of fuel for the setup, trust me i have been runing it for a while and no problems, and yes the smaller belt will work fine with the 2.7, i larger idler pulley wouldnt hurt either.

 

Im glad the 2.7 is working for you..and nice write up man! I do have one question though..why didnt you go with the 2.5 and the 60's...or the 2.7 and 60's instead ofhe 42's?

 

aaah ok..answered my question..thank you

 

Your welcome.

 

I just worry about maxing out the injectors running the 2.7 then having to pay 219.00 for a set of 60's

 

Yea i see where your coming from, i was worried the same way you were, but i have sat down with a member from the redline forums ptparker, we had a big talk over this, we looked at the data log for my car running the 42.5s with the 2.7 and the injectors were never maxed out even at the 7k redline, you can safely run this with no problems, i have been running the set-up for a while and it runs like a champ and does it safely.

 

sweet, it seems youve done some homework then, so what ill do is when i recieve my 2.7 pulley, i will tune with that since the belt and injectors are fine, thanks man.

 

Just curious bro, It looks like you and i will have a very similar set up comming soon. My question is how much power are you seeing with your set up??

 

Yea from what ive heard about the 2.7 and the 42.5lbers, its safe also. The s.c redline is at 16,000 and the 2.7 spins it up to 15,555 or so ive heard. The 42.5lbers will be hurting if you like to "enjoy" your car but it is in fact safe. However if I had no new tune yet, then i would just go with the 60lbers to be safe if you have not upgraded your injectors yet. But if you already have the 42.5ers, then your safe with the 2.7in, no need to upgrade to the 60's.

Also another question that I have for a few of you, how would i tune my car with GM stage 2, if i wanted a 2.8? Do i just walk into the dealer and tell them to hook it up to a tech 2 (which is their diagnostic tool) and reflash it for me? Or do i just disconnect the negative battery when I put in the 2.8 and leave it off for a while? Let me know what you think.

 

Havent had it on a dyno yet, just at the track it ran a 13.6 @105, with a horrid 60ft, and traction issues, i would put it at 270whp rough estimate, could be wrong though, iam seeing 19lbs also.

 

[QUOTE=cobss187]Yea from what ive heard about the 2.7 and the 42.5lbers, its safe also. The s.c redline is at 16,000 and the 2.7 spins it up to 15,555 or so ive heard. The 42.5lbers will be hurting if you like to "enjoy" your car but it is in fact safe.

wat do u mean they will be hurting?

 

[QUOTE=distillion]the s.c redline is 16000 and the 2.7 spins it up to 15,555 like i said so they will be nearly maxed out. Its not like fuel injectors can be damaged or anything? Anything can be damaged or have problems..... but can anyone answer my question on page 1 of this thread DAMMIT?!?!?!?!?!?!?

 

First off, Great write up OBSSSD My setup is identical to yours except for 2 things:

1. 2.6" ZZP Pulley (very small difference)
2. MAFT for tuning (for now until September HPtuners)

Shortbus, I do believe you! I have been monitoring all day long with my Interceptor. I can’t find anything in my readings that tells me my Injectors are maxed out!! Hell am boosting 18 PSI at redline and the car runs like a champ...I get 0 Knock reading at over 16PSI.

This has been an ongoing (yet very interesting) debate about 42# Injectors vs. 60# Injectors.... we need more people to stand up with proof like "OBSSSD" just did.
I don’t want to spend money on 60# Injectors for nothing; I just installed my 42# Injectors day's ago.

I will have a huge write up on my setup too very soon. With Dyno runs to redline with an AEM wideband AFR gauge Installed.

 

Exactly the 42.5s can handle more than people think, people just read what everyone else says and goes by that, until you have actually had hands on stuff with hp tuners or a gauge you really cant say, i have done many runs with hp tuners, i get 0 kr, and the car runs great, the duty cycle is no where near the 120% at the 7k redline, and i dont see what cobss means by if you like to enjoy your car dont get the 42.5s, becuase my car actually runs great, beat a rl with the 60lbers and a 2.6 pulley, no gm doesn't have a tune for the 2.85 pulley, just install the pulley yourself, and get a hp tune.