Opti to Dizzy?
Thread Starter
Staging Lane
Joined: Apr 2008
Posts: 81
Likes: 0
From: west valley utah
Opti to Dizzy? 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.
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.
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.
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
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.
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........
Thread Starter
Staging Lane
Joined: Apr 2008
Posts: 81
Likes: 0
From: west valley utah
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???
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.......
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Thread Starter
Staging Lane
Joined: Apr 2008
Posts: 81
Likes: 0
From: west valley utah
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.
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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
Thread Starter
Staging Lane
Joined: Apr 2008
Posts: 81
Likes: 0
From: west valley utah
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.
you can buy the injector harness and main harness from FAST thats your best bet
Thread Starter
Staging Lane
Joined: Apr 2008
Posts: 81
Likes: 0
From: west valley utah
Im assuming you just swapped out the PCM for a fast XFI computer and
then run the new harness.
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
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
Thread Starter
Staging Lane
Joined: Apr 2008
Posts: 81
Likes: 0
From: west valley utah
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?
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
