If so, what size injectors did you go with? 42#ers? Also, what type of HP increase resulted? Since I already have a Nelson tune, I am covered as far as tuning for the injectors. I am trying to decide whether to spend money on new injectors or to get a custom grind cam. I just pulled 358 RWHP and 447 TQ with the Whipple and just wanna spend my dollars in the right place. Decisions, decisions...

 

Youll need the ASM 43lb injectors. They are a good investment I think. There are steps that unfortunately cant be skipped. Bigger injectors is one of those I think. Ive still got a couple of things before I can get my cam

 

I've heard he does good programming for this conversion. As mentioned above the injectors will be needed to go along with the blower. They should also supply you with enough fuel for the cam upgrade.

 

Ya you will be good with the ASM 43lb injectors. I run the Delphi '009' 42lb/hr injectors. They are 42lb at 43.5 psi. We run 58psi, so they act a bit bigger.

I thought you ditched the whipple junk already? I have now that etc figured out the bypass valve thing etc. It performs sooo much better. It actually does what I program it to do now. The tuning has become much more accurate without the whipple comp on. I dynoed 341rwhp 376rwtq on 3psi with the 4.25" pulley (I bypassed the blowoff incorrectly and blew off all but 3psi) on a Dynojet dyno. That was with the intercooler too and 22* advance I won't say with the 12lb pulley Well actually I haven't dynoed with it yet, but good god

I recently have been tuning on the street with a wideband to accurately set my A/F. I nailed it at 11.7:1 - 11.8:1 throughout the rpm range.

 

i thought he did too. it's puff puff pass, not puff puff puff coontoot. i just went back and looked at " nelson tune for whipple" thread, toot was involved in that discussion, has three or four posts on the first page. hehehehe. anyway, toot go look at that thread again i think it has all the pertinent info you need. you will be glad you ditched that junk and yes you need the injectors. the whipple aux inj's don't work right anyway, and you can't tune them. they are a rich/lean nightmare waiting to blow your motor to shreds. and by the time allen is done with me he should be able to nail yours on the first shot. e

 

 

Just ditched everything on a customers 03 ss with the whipple, used the 8.1 marine injectors & had a small problem with lean it out enough, but all is fine now. I was actually suprised to find out the whipple computer mask the true maf readings.

 

But I didn't inhale...lol

etc - You must know me from somewhere...

I haven't YET done the extracation of that Whipple EFI box. I am definately gonna do it, though.
It is quite obvious from my dyno graphs that the aux injectors make a big difference...the graph goes downhill from 3000 RPM until the aux injectors kick in at 4000 RPM - the curve then climbs again. The other side of the coin is that this must mean the stock injectors are just not cutting it at 11 PSI.
Right now I need to determine if the L107 60# injectors (http://www.mototron.com/prod_minifuel_long.htm) will work in the 5.3. If so, that works well for me since I already have 2 that I bought to replace the 42#ers that came as aux injectors w/the Whipple kit. That saves me $130 right there. The 43#ers will support, what, about 550 HP? Maybe the 60#ers are overkill, but if I am gonna spend the money, I might as well have room to grow I need to shoot Allen Nelson an email and see if he has tuned for the Mototrons. I don't want to have idle issues on a daily driver.
I plan on doing the following:
1) Get a couple of Autotap logs to check KR and injector duty cycle. If that shows what I think it will, then I will do the injector swap, get Allen to retune, and get rid of the WEFI.
2) Go back to the dyno and run again, this time with the wideband info as well.
3) Santa will bring me the cam I choose and then it will be back to the dyno.

Thanks for the help guys...I am getting there.

 

hahaha, just a shot in the dark toot. can't help with the inj's info. seems the 43's are good for quite a bit of boost, think some guys are running 12. i'm at 8 and my duty cycle is pretty low. i know what you mean about the aux inj's, i unplugged them and watched my duty cycle hit 100% pretty early. what i was saying is they are basically either on or off, no adjustment. the idea is good, it's just the whipple electronics don't control them very well. if they had a way to adjust the flow, they might be in business. but like i've said before, the gm pcm is much more capable of metering fuel and air. good luck with that, if you need help when you scrap the crap, give a yell. and like someone said, you can actually see what's going on in the pcm once the whipple is not modifying signals anymore. you'll wish you did it sooner. e