purpleflamzz

anyone running the dizzy in the rear of the intake on a lt4 intake?
mine has the provision for it and am wondering what kind of advantages it would give me and option there are?also is it worth the work considering the 7000 rpm limit in the 95 OBD1 PCM I used. just looking for all options.
lt4 396 in a 72 camaro.

gatorhead

iTrader: (4)

It is made to fit but it is still a little tough to work on cuz it is under the cowling. The advantage would be no opti lol. It is preferential and really other than the known opti problems the limitations of the puter that are already present would lead me to leave it alone until the opti went out and then change it if ya wanted. Also I should mention I never messed with one that had the fuel injection still in use, only carbed apps.

quik95lt1

iTrader: (7)

unless you are spinning big time rpm 8000+ or running an aftermarket PCM such as an XFI or a DFI I dont see the advantage of it.......a properly built opti will last a very long time on 95% of the builds out there

gatorhead

iTrader: (4)

I keep looking for the damned Like button on these forums lol.

I had an opti go 283k on my Formula

The original one on my 94 z was still operational when I spun a rod bearing at 186k.

quik95lt1

iTrader: (7)

lol


i ran the opti on my 355 for three years wit not one issue

and i spun the hell out of mine on my 386 i got now..........i ran the thing 8000+rpm with the opti on it......then i grenaded a rotor....called msd he asked how high i was revving it and when i told him he almost had a heart attack on the other end of the phone lol.........

i ditched my opti for a couple of reasons.......one the rpm......two i needed a cam signal for my XFI and three its wayy easier to service at the race track........

purpleflamzz

Motor is really built stroked to 396 with all forged callies internals,com cams custom grind,solid roller .254 .268 @ .050 and .622 .638 112 LSA, ross domed pistons, older design AFR 227 heads ported/Jessel comp rockers system, lt4 intake,42lb injectors,1300 AS&M monoblade,mezeir 55gmp,gm new opti, 1 3/4 headers,3' exhaust.
Im sure the pcm is gonna be pushed to the max and i know the opti is the weak link. is the dizzy in the rear a improvement or alternate???

quik95lt1

iTrader: (7)

you're pcm is not going to go the RPM that motor is going to want to go......see my above post.........i got a cam in the vicinity of that duration but a bit different LSA and lift and with a AI Ported TFS head and a single plane the car makes power out to 8100.......

purpleflamzz

So whats the option to get the most out of this motor? ditch the injection for a carb? or xfi,delteq,ms etc.. just want to stay as cost effective as possible but get the motor past this hump of a 7000 rpm limit.

robsquikz28

iTrader: (246)

cost effective, go carb then

quik95lt1

iTrader: (7)

yea you got two options.......one is an aftermarket fuel injection unit or the other is a carb and new manifold which you'll be buying a dizzy anyway..........id personally go with an xfi......ive had really good luck with mine

purpleflamzz

with the XFI could I just buy the computer or would I need a harness as well.
I know a guy who just went XFI and XMI on his 95 and delted the whole opti trying to get him to stop by he works swings.

quik95lt1

iTrader: (7)

yep thats what i did with mine......made my own wiring harness.......my whole stock harness ecm is gone............

you can buy the injector harness and main harness from FAST thats your best bet

purpleflamzz

so does your system use your stock lt1 fuel rail and intake? or did you have to use the TBI looking stuff?
Im assuming you just swapped out the PCM for a fast XFI computer and
then run the new harness.

quik95lt1

iTrader: (7)

nooo i run a modded single plane with an elbow and mono blade..............but you can use your stock stuff if you want.......

heres my setup...


with the msd dizzy in the back to clear the cowl...



heres a pic of the harness too......you can see i built it so it tucked away and hid very nicely....i wanted a very clean look

purpleflamzz

that is freakin sweet set up. my heads use the lt4 bolt pattern and are square port not D.Looks like I would have some work to go that way, anyone ever swtched to a ls1 based computer or are they limited to 7000 as well?

robsquikz28

iTrader: (246)

yep many lsx pcm guys on here...they are limited to 8k rpm

check out eficonnections.com

quik95lt1

iTrader: (7)

thanks!!! yea i had to convert my bolt pattern too i usedd the LT1 pattern out the outside bolts and made angeled spacers to correct the geometry and i drilled and heli-coiled my inside bolts to fit the sbc pattern.....the intake was originally sold by edelbrock to fit a SBC motor......yea the TFS run the D port exhaust ports....i had to switch to a 1 7/8" header though which means my bolt pattern changed on the headers to a stahl pattern now....wayyy easier to work with.....

as for the ls1 computer i can be made to work but you'd have to run the 24x system from EFI Connection I beleive is the company......the LS1 PCM will go way over 7000rpm

Wicked94Z

iTrader: (26)

aside from the cam being very wrong it sounds like a solid setup. I'd run DFI or XFI on that, you can do it much cheaper than the 24x setup.

Big Al

iTrader: (1)

Let me ask this again. What about an Electromotive set up? No distributor, no Opti. What's the problem?

Al 95 Z28

Wicked94Z

iTrader: (26)

for $3200?? I'll pass.... my $1000 Gen 7 works great.