SHO-NUF

Howdy folks.

Here's the deal- Currently I own and drive the **** out of the SHO-NUF air boat. She's a 15x8 American Air boat , was a ZZ4 355 HP crate engine but sent it to Reher Morrison and its now a 425 HP 6100 RPM engine with a 2.88 gear drive reduction unit and a 78" Water walker carbon fiber prop.

Induction- currently a Victor Jr with a Holley 870 DP manual sec.

Spark- HO HEI.

Exhuast-3.5" collectors, flex and 3.5" SS muffs with SS headers.

I have a 1985 TPI unit complete with stock car harness,dizzy,FP, MAF in my shop.

I think if I just rebuild the intake, buy a Larry's electric harness,ECU and sensors I can make it work...

Questions- I have a fairly radical cam profile and very little manifold vacuum....how do I get the prom burned right? Who?

Heated o2? Non heated o2?

Will this system turn 5500 RPM?

Can I advance timing beyond stock? I'd like 34* at WOF-

Currently I get 2 MPG and I'd like 4 mpg WITH reliable power.

What to avoid what to do?

Ok beat me up and tell me to go away!

Brotherbob

Tuned Performance

iTrader: (92)

If your wanting to obtain power at the higher rpm you might want to consider a holley stealth ram. running a heated o2 like a acdelco afs-74 would be ideal but you can setup the mpfi to run in OL. You should contact southbay fuel injectors and I would think you are in the 32-36 #hr range. You didn't state your cam specs ?
A memcal can be reprogramed to any desired timing vs map kpa . I would look into this harness and if you need a ecm and memcal/ programing options send me a pm.
Larry's electric uses v6 memcals and do not retard timing if a knock occurs.
http://www.ebay.com/itm/TPI-Speed-Density-MAP-wiring-harness-for-1227730-/141143848405?pt=Motors_Car_Truck_Parts_Accessories&hash=item20dcd435d5&vxp=mtr

Tuned Performance

iTrader: (92)

Opps double post

SHO-NUF

Optimal RPM on the Airboat is all about putting that prop in its sweet spot for efficiency.
I need at least 5000RPM and would like 5500? I can hit that now but power does fall off at 5K or so...

I have a 85 ECM 1226870 that is pretty much useless right?

So heated O2? Hmmm ok.

Let me dig around and read so I can educate myself more too , thanks and keep it coming.

I asked for my build sheet from RM so I can get the cam specs and such...more to come.

BB

Tuned Performance

iTrader: (92)

Tpi maf is more forgiving for engine modifications, The 870 was a one year only and a very slow baud rate. If you are wanting to stay with maf I would rework the harness and atleast upgrade to the 1227165 ecm. For the o2 to start to become active it needs to reach between 5-600f. In a collector the o2 often is to cool. If the o2 isn't helping correct the fuel ratio you might as well run a carb or lock out CL. That really defeats your ultimate goal. If you are using the zz4 cam I have a great tune I worked on for a few days with a customer live. We used 30#hr injector and the 1227165 maf ecm . The Dyno graph is on this link. I didn't Dyno tune it just tuned on the street but here are the results
https://www.thirdgen.org/forums/dfi-...rformance.html
Tpi drops off at 4500, the small diameter long tube runners work great for low end torque.

SHO-NUF

I honestly dont know what I want other for it to WORK and get better MPG! I have 2 each 40 gallon tanks and we can blow through that in a day with enough FUN!

I know I hate the dieseling when I shut her down hot and the BIG BOG I have just off idle....

I just wanna turn the key , light it , dump it and thump it!

I can do the install and take instructions well....I'm married!!!LOL!

BB

Tuned Performance

iTrader: (92)

Really sounds like the carb wasn't jetted properly, running to rich if its dieseling from all the hot carbon .

SHO-NUF

Agreed..but LEAN is a far worse problem at 5500 RPM WOT around 60 MPH on 1/2" of water! Honking on the loud pedal! LOL.
BB

SHO-NUF

TP you have mail....

SHO-NUF

Ok Tuned P is working with me to build a kit. Harness bought...working the rest..
Stay tuned....
SHO-NUF!

Tuned Performance

iTrader: (92)

Let me know what part numbers you need. you will have a tps, ect , mat (same part different locations) and heated o2 amazon has a good price for the afs-74.
2) you can think of the knock sensor as a dr stethoscope but just picks up a certain frequency range. You can leave this out just let me know. Its hard to say if it will falsely retard the timing until you try it and datalog or just see how the power is.
3) if you purchased the maf harness for I think it was $299 it just uses the maf sensor so no map.
4) fuel pump, here are some ideas
https://www.thirdgen.org/forums/engi...-sump-kit.html
5) 30 #hr You might want to call up southbayfuel injectors. if you use the promo code tuned you will receive a 10% discount.
6) not really needed with a tune , higher pressure is harder on the injectors, spray pattern is effected.
You might want to check your alternator output, tpi and tbi use a minimum of 103 amp.
I posted a link yesterday to the best deal I could find on the tpi maf ecm.
I hope you received the cam specs and its not to radical.

SHO-NUF

Lets see..
5.7 intake complete -GOT IT.
MAF Harness from TP - On the way.
ECM that TP linked- on the way.
9th Injector block off-on the way.
EGR block off-on the way.
Gasket kits,intake,TPI-on the way.
SS hardware kit on the way.
TP gonna put the tune on the PROM for a river rat...check.

Researching o2, 30lbs injectors, knock, and Alt specs now....

Wheee hooo we are on our way!

SHO-NUF!

Tuned Performance

iTrader: (92)

SHO-NUF

Hell Yeah we is!

TP we get this deal done, come down and I'll swear to behave while we honk the LOUD pedal for about 40 miles in 3 " of water!

TPI Airboat - I know it's different and weird but I live for this $hit and have been riding air boats since I was 7 years old...this boat is a culmination of years of screw ups , its one tough SOB.

All I can say is thank you to Brian for his help and guidance with this deal , its not everyone who would get involved with a crazy project like this.

THANKS.
BB

Tuned Performance

iTrader: (92)

Im all on board, im sure the expense will be worth the fuel savings

SHO-NUF

Yeah 2 MPG sucks big green donkey dicks! If we can get 4 MPG I can loose 1 40 gallon tank and go the same distance! Winner Winner Chicken Dinner!

Put me in coach I don't smoke!

BB

SHO-NUF

30LB injectors on the way via Southbay injectors -they had the best deal in town.
Engine is on a stand now and in my shop I'll post a pic or two just as soon as I can figure all that out.

I need a 1 wire GM alt with a minimum of 103 amps anybody got a P/N I can use or have a link to a affordable one?

Thanks,
SHO-NUF!

Tuned Performance

iTrader: (92)

I will send you a email about the alternator, I may have a low buck solution

SHO-NUF

Pics are in the email and a couple more for good measure.
SHO-NUF!

SHO-NUF

CAM SPECS- 227 @ .050 intake .241 @.050 exhaust
.513 lift intake .498 lift exhaust 107 lobe separation in at 104

O2 sensor and bung bought
Cold air intake on the way.
Knock sensor on the way.
Injectors on the way.
ECM here.
9th injector block off here.
gasket kit TPI and intake-here.
Hardware kit SS here.
Harness?
Prom/computer wizz bang stuff----TP is on the ball.

SHO-NUF

Anybody have issues with a WALBRO external fuel pump P/N GSL-392? Seems like the best bang for the buck?

Tuned Performance

iTrader: (92)

Seems like a good deal

SHO-NUF

Good cause I bought it...if you look around you can get it with 6AN fittings for the same money...

Harness and EGR block off came in today...

Gonna start the building of the intake this weekend and some clean up work on the engine.

I guess I need a real OIL pressure sending unit for the harness? If so what p/n? I still run a mechanical oil pressure gauge too.

Thanks!
SHO-NUF

Tuned Performance

iTrader: (92)

you can use a ACDELCO Part # C1804A Gm# 19190665 ops.

SHO-NUF

Ok cool on the way....Thanks TP!

SHO-NUF

Most parts are here....gonna start assembly this weekend and rework my engine stand so it can go back in the boat.

Thanks TP , we need to talk about the prom/tune for the ECM before long..
BB

Tuned Performance

iTrader: (92)

You might want to is Siamese the stock runners upper flange and cut out the dividers in the plenum. Any increase in the plenum volume will help with getting upper rpm hp.

SHO-NUF

Ok I'll look that up but from what I have read the stock form was good for about 4500-5000 RPM?

Tuned Performance

iTrader: (92)

tpi will make hp at a higher rpm, but due to ltr design the airflow sucks at higher rpm, comparison to the hsr.

http://www.gmhightechperformance.com...hird_gen_iroc/

scoflaw

iTrader: (2)

You'll get better gas mileage, but your gonna take a huge hit in the horsepower dept. Boats like horsepower. That barge might not even plane with the power level cut in half. Victor manifold with a big carb vs. a little tpi setup ? Shonuf it's gonna feel like your draggin the anchor

SHO-NUF

She was a bone stock ZZ4 at birth and did fine.

I've had little bitty carbs on it before and dual plane intakes = it still planed out. If it does not work out I'll pull the TPI setup and put it on my wifes 72 GMC Jimmy 2wd and go back a carb.

Engine-manifold built- wiring up today and some other boat related stuff.

Thanks,
SHO-NUF

SHO-NUF

I have vss plug / trans lock up plugs and no where to put them? Is that a problem ?
I have a big cap big plug HEI and a very small plug on harness ? Either I need a patch cable or a small plug ,small cap HEI ? Got a part number by chance?

I have pictures but I cant figure out how to link them correctly?

Thanks for the help folks!
BB-SHONUF

Tuned Performance

iTrader: (92)

The flat 4 connecter will need to be changed for the coil in cap.
a= white
b=purple/white
c=tan/white
d=black/red

the pink and white wire coming from you harness that use to go to the coil will goto the side of the hei. The pink is accessory power. The white wire goes next to it tach.


http://www.ebay.com/itm/like/301069451471?lpid=82You might want to make sure you are using a melonized distributor gear.

SHO-NUF

Ok so I can just swap out the plug on my melonized big cap dizzy then?

What about VSS and TQ convertor lock up? just zip tie them in the harness?

Still need to figure out those two sensors on the front of the intake manifold both look like coolant sensors to me and the plug works on both ?

BB

Tuned Performance

iTrader: (92)

The plug on the distributor just needs to be swapped out. if you have a large cap from a 85-86 f-body the drive gear is not hardened. If its from a 87 -91 corvette roller engine the gear is melonized. If you cam is a roller you need the melonized gear.
The tcc and vss can be tucked back into the harness since they will not be used.
If you have two sensors on the front of the intake the one on the rh side that says bosch on it you can toss in the garbage. It was used to control power to the ninth injector. The cts is the same as the mat under the plenum.

SHO-NUF

Ok got a ton of stuff done.

Where can I mount the knock sensor? I have two 9/16 plugs in the side of the block that have coolant behind them? I have two threaded bosses around the filter -one is a pass through to the bell housing- and one terminates in the block?

O2 Heated? I have a heated O2 coming but my harness is a single wire? So what do I need to do there?

Any suggestion for a check engine light? My gauge panel is in the bright sun most of the time.

Got any ideas for a waterproof ECM enclosure other than a WP box from walmart?

THANKS!

Tuned Performance

iTrader: (92)

The knock sensor can be mounted on either side of the block in the drain plug hole. factory it was on the rh (pass) side. For mounting the ecm how about a Tupperware style container with a snap lid. Drill a hole through for the wires to go through and bushing it or silicone it. Or you could even make a u shaped slit and silicone it after the wires are in the box. for mounting it how about under your seat maybe some straps to secure it or metal pipe strapping. For the o2 Jim's performance .com has the pigtail or I can build you one or if you want the parts list lmk? For the mil that's a tough one not like you would hear a buzzer with a uncapped sbc screaming at you let alone the prop lol. I wonder if a darker light would be better then when its illuminated it will show up better. that's a tough one with all the light.
http://www.ebay.com/itm/12mm-1-2-Blue-12V-LED-Metal-Indicator-Pilot-Dash-Light-Lamp-Black-Casing-/321249017537?pt=Motors_Car_Truck_Parts_Accessories&hash=item4acbeefec1&vxp=mtr

SHO-NUF

Build the pigtail for O2 and the small plug to big plug HEI dizzy.

10-4 on the Knock sensor , I just wanted to be sure it could be in coolant passage/drain.

I can run a Murphy switch in with the light that would interrupt my ignition enough to get my attention...I use one for OP and TEMP already...just need the light.

I have airplane headsets with comm ,I bet I can wire into them a alarm for these warnings.

Thanks,
BB

Tuned Performance

iTrader: (92)

Torque the ks to 14ftlbs over torque will make it more sensitive. If the prop cases issues with retard we will have to eliminate the ks.
The only connecter available you have to buy over 400, delphi 12084676.
I can solder on and shirk tube the flat four hei connecter to a lt1 iac.

SHO-NUF

TP sometimes I feel like you speak a different language than me!LOL.

So do need to buy that connector or something? ....and don't over torque the knock sensor..right?

I bought the check engine light light above already...just FYI.

Tuned Performance

iTrader: (92)

Pic 1

Tuned Performance

iTrader: (92)

Pic 2

SHO-NUF

PERFECT!

Tuned Performance

iTrader: (92)

heated o2 pigtail

SHO-NUF

Wonderful
Now where are does this wire into?
1-GRD
2-Signal to O2?
3-Fuel pump pos?

Tuned Performance

iTrader: (92)

Blk, -ground
Purple- 02 signal
Red, accessory power for 02 heater, can tap onto fuel pump hot wire usually a grey wire.

Tuned Performance

iTrader: (92)

Parts will be shipping tomorrow, ecm cover and screws, memcal, and the pigtails

SHO-NUF

Tuned Performance

iTrader: (92)

SHO-NUF

It looks a lot nicer now but I have a hell of time posting pics...I'll send a few to TP and see if he can help?

THANKS for all the help I have got from this board,TP and Southbay injectors Fo'SHO'!
BB