Hey guys, I'm nearing the end of my build on 5.3. I'm running a whipple and am having a small dilemna as to where I'm going to relocate my IAT and running a stage 3 Snow methanol kit. I am aware that all three of these have to go post whipple but there's limited room. FYI, it's a 2002 5.3, I had Black Bear tune it for deletion of the supplemental injectors...

 

I have an older Whipple kit on my 2000 Silverado making around 11 psi on the old 5.3. I removed the 2 auxiliary injectors, tapped the 2 holes and moved the IAT sensor to the hole closest to the SC. I put a plug in the other hole. Don't forget to seal the screw holes also as some of them are drilled through.

I also have the Snow kit that you have and my nozzle is before the SC/throttle body. There really was not anywhere else to mount it. I was concerned about giving the IAT sensor a false reading if I used the other injector hole. I am using the #6 nozzle with the controller set to come on at 3.5 psi. The full setting for the meth was set by adjusting it up until the desired air/fuel ratio was achieved as it flattens the curve as you raise the top number. I do have a wideband O2 on the truck to verify this.

Use your washer tank or something larger for the Meth/water blend. that tank that comes with the kit is way too small. The washer tank holds close to 2 gallons and it still seems to go really quick. But we logged the IATs for a few hours on the street in August heat and the meth really brings them down.

Good luck with your project!

 

Bluecobra, thanks so much for your input. My concerns are the same. I'm aware that I must move the IAT to prevent the mentioned false readings...thanks for the tip about sealing up the screw holes, that hadn't passed through my head yet. My biggest problem is that I've got the dual nozzle setup from Snow, do you know by any chance if both of these nozzles spray simultaneously? I could run them close together if not, but if so I'm concerned with "flooding" for lack of a better term...I've read most places you shouldn't meth pre supercharger, is that what you were doing?

 

I have been spraying meth pre-SC for 3 years with no adverse effect. I only have one large nozzle setup on mine. There really is not a better place to put them with the Whipple setup.

You could use the 2 spots where the injectors were for Meth and put the IAT in the plenum, but I don't know how accurate the reading would be. Plus you would have to put a hole in the plenum. I went around and around trying to figure out the best place to put the IAT. I thought about drilling a hole in the plenum, using the EGR port, etc. Nothing seemed to be any better than where I have it now.

When I bought my kit from Snow they told me the best place to mount the nozzle was pre-supercharger. I guess opinions change over time.

 

Thank you so much, again, for the reply and help in this matter...I've been pulling my hair out for a week trying to figure this placement out...I've exhausted all my options and I think your suggestion(and tried performance) will be where I go...

I can't thank you enough.

Why did I get into building motors just turning 38!?

 

I got into modding back in my early 30's. It doesn't get any better as you age, or it hasn't for me anyway. Just gets harder to crawl under the truck.

How much boost are you setting up for? You must have larger injectors installed if you have removed the aux injectors? Have you removed all the Whipple piggyback computer and all that? Mine served it's purpose back in 2003 when I installed my Whipple kit. That was before you could reflash the ECM and make changes. My Whipple has around 85k miles on it, truck has 145k, and is still working as intended, just with a smaller pulley.

Enjoy your project.

 

Ha, harder and harder to crawl out every day!

I have replaced the injectors with 42# Deatschwerks and had Justin at Black Bear tune it to get rid of that spider's nest Whipple has...after our conversation yesterday I called Snow and they confirmed that spraying pre charger is acceptable with a Whipple(but would not work on my Powerdyne 4.3), something to do with the composition of the metals involved. What a relief, as you well know the space post charger is limited...

BTW, I'm setting it up for the stock pulley(for now?) which from what I understand is 6-7 lbs. of boost, should be plenty to throw my windshields out the back!

p.s. I'm a mobile autoglass installer

 

If you are going to use both nozzles, I would put them on opposite sides of the air intake so you get good atomization. Really though I don't know if you will need more than one nozzle. I guess it depends on other mods, etc.

I am using a single #6 nozzle and it works fine. I have done heads, cam, long tubes, no cats. etc. You need to do something to the tranny or you will break something. Trust me I know this.....

 

Hey Blue, the Snow kit that I purchased utilizes a dual nozzle system, one that opens up at a set boost rate and the second kicks in while under WOT...that's the only reason I'm running two. Thanks (again!) for the suggestion to run them opposing each other, seems like you've done your research.

Now about the trans....ugghhhh..as you well know, projects like this tend to get out of hand, quickly.. I'm looking into a couple of different options concerning this issue as I understand that my current 4l60e is only rated for about 400 hp. I'm sure I could baby it for a bit but the need to punch it will soon overcome me, I'm sure! Any suggestions as far as a rebuilder or new trans that has been time tested? I'm working on a limited budget and just now started to look for a posi for the rear also...

I'm quite patient and willing to wait if it means I get a better product under my truck, thank the gods my truck isn't down for this whole process but getting all the pieces together with a limited budget is proving to be a long drawn out process...

Thanks again for all of your input, I sincerely appreciate it.

 

Sorry, out of pocket for a few days...Ok, my Meth kit has the progressive controller for a single nozzle.

Anyway, I put my Whipple on my truck at 65k miles along with cat-back exhaust and everything else stock. Stock it made about 203 rwhp and after the blower it made 310 rwhp with 6 psi. The tranny held fine even with frequent towing of an enclosed trailer with another car in it. Around 120k it started to slip some on the 1-2 shift. So I added long tube headers, Eaton diff, trashed the Whipple-tronics and extra injectors, smaller pulley to go to 8-9 psi AND had the tranny rebuilt with everything except the hardened output shaft. Added a small stall convertor to it as well. It did fine for a couple years. Making about 340-350rwhp.

Then I added new heads, cam and an even smaller pulley to get it to 10-11 psi. Moved it up to 440rwhp. Few months of that and I broke the output shaft on a WOT 1-2 shift. But my truck is an extended cab 4x4 and they are heavy plus the 4x4s have a shorter output shaft and from what they tell me and are therefore more likely to break because there is less length to flex, or something like that. But I went back with the 60e because it fits easier, I just spent about $3,700 having it rebuilt with billet this and kevlar that and added a Circle D multi-disk convertor. So far, rock solid.

So I think you may get the tranny to last a while if you respect it. The G80 diff, may last as well. But you know things always break at the worst possible moment. Good luck!