LT1 383 w/single plane conversion?
#1
LT1 383 w/single plane conversion?
Hello all! I'm finally building myself a 383 LT1 and I want alittle something different. I was thinking about doing a single plane conversion. Has anybody here done this? Now to be clear I don't want to do the whole elbow with a ls1 tb. I want to keep the old school look with the air cleaner resting happily in an open element style,lol. More of a multipoint efi deal like the Edelbrock Pro flo system. Can anyone give me an idea has to how to go about this?
#2
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: LT1 383 w/single plane conversion?
Plug hole for dist at rear
http://www.summitracing.com/parts/EDL-29785/
http://www.summitracing.com/parts/ACC-74139/
http://www.summitracing.com/parts/HLY-9901-101-1/
http://www.summitracing.com/parts/PFS-52039/
Buy 4 bbl TB
http://www.accufabracing.com/4_barrel.htm
http://www.summitracing.com/parts/EDL-3878/
http://www.summitracing.com/parts/HLY-112-577/
The previous owner of my Victor E intake was running it on a big Hp 383 LT1
Instead of welding and re-drilling the center bolt holes he tapped his heads to suit the reg pattern
Last edited by vetteoz; 11-19-2010 at 11:20 PM.
#3
Re: LT1 383 w/single plane conversion?
That's exactly what I'm talking about!!! So I wouldn't have any issue other than the obvious distributor hole and drilling for the LT1 intake pattern? What intake is that? I might try to use the same one. Will the ports line up correctly?
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: LT1 383 w/single plane conversion?
http://www.summitracing.com/parts/EDL-29785/
Ports are reg SBC.
May require slight gasket matching to suit
Mine was port matched to the GM LT1 #12367777 gasket
#6
Re: LT1 383 w/single plane conversion?
Check out multiple LT1 single plane conversions here with their cost to build:
http://www.ls1tech.com/forums/lt1-lt...lane-pics.html
http://www.ls1tech.com/forums/lt1-lt...lane-pics.html
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: LT1 383 w/single plane conversion?
As a interesting side note;
Because he had the dist hole in the intake, the owner of my intake chose to run a MSD dist
http://www.summitracing.com/parts/MSD-84697/ (just a cap and rotor ; no electronics inside )
just to distribute the spark to plugs while retaining the Opti as the trigger for the stock spark control
Did away with the common HV problems associated with tracking inside the Opti
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: LT1 383 w/single plane conversion?
The crank trigger for the ECM spark control and the actual " distributor" that send the spark to correct plug.
All you are doing is separating the components
As noted the MSD dist only has a rotor inside; no electronics
#12
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: LT1 383 w/single plane conversion?
Don't know you would have to anything about terminals on Opti. They are just blind terminals holes so no water could get into unit
#13
#14
Re: LT1 383 w/single plane conversion?
I'm bringing this one back from the dead to ask a few more questions. Does anyone here have any experiance with this throttle body?
http://www.summitracing.com/parts/ac...6/media/images
The reason I'm considering it is the TPS and IAC sensors are a direct plug and play. Are there any 4 barrel 1000cfm bodies that share this same quality?
Also I have a friend who might hook me up with a Victor Jr. carb manifold. How hard would it be to convert it to an EFI manifold? I found a lot of weld in bungs on ebay that would probably work.
http://www.summitracing.com/parts/ac...6/media/images
The reason I'm considering it is the TPS and IAC sensors are a direct plug and play. Are there any 4 barrel 1000cfm bodies that share this same quality?
Also I have a friend who might hook me up with a Victor Jr. carb manifold. How hard would it be to convert it to an EFI manifold? I found a lot of weld in bungs on ebay that would probably work.
Last edited by robertfrank; 12-07-2012 at 06:49 PM.
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: LT1 383 w/single plane conversion?
http://www.accufabracing.com/index.p...cid=1&Itemid=5
but I just found this post indicating the LT1 TPS works backwards on the Accufab unit
http://ls1tech.com/forums/drag-racin...placement.html
so you need a TPS off a late TBI engine
Going to put my DVM on the TPS tomorrow to confirm operation
#16
Re: LT1 383 w/single plane conversion?
My apologies for not clarifying this but I'm not switching over to the lt1 style pcm, I'm going to reuse my EBL flash with the port mod and just install 8 new injector wires. That's why I was asking if the accel throttle body would work.
#17
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: LT1 383 w/single plane conversion?
The TB you list above and my Accufab unit both only have mounts for the late style LT1 units that use a smaller elec connector than the earlier TPI units.
IIRC wired the same so all that is needed is to splice on a new connector to suit
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Car: 91' RS
Engine: 310 C.I.D. + n2o
Transmission: T-5
Axle/Gears: built 10 bolt 3.73's
Re: LT1 383 w/single plane conversion?
I have a 4150 tb ill sell you dirt cheap it has lt1 style tps on it already
#26
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Re: LT1 383 w/single plane conversion?
Visit the MegaSquirt info page, lots of info there about adding an IAC valve to a system without one. It would be easy, just drilling a hole in the plenum and tapping it and connecting a hose to it that goes to an IAC valve housing. I also have the Accell throttle body but in a 1000cfm or whatever. it uses a tbi style tps and ls1 style iac. The IAC valves on L98 vs LS1are identical in how they work or are powered, you just need to wire in the new connector, i did it and it works fine on GM efi ecms and MegaSquirt (0f course). If I recall, Amazon had the cheapest prices on the Accel single plane throttle bodies too.
#27
Re: LT1 383 w/single plane conversion?
I've been checking out ebay and I found this intake, has anybody ever used this one?
http://www.ebay.com/itm/330568618348...84.m1423.l2649
I also saw this but it too needs an external iac housing..
http://www.ebay.com/itm/180810415357...84.m1423.l2649
any thoughts on these?
http://www.ebay.com/itm/330568618348...84.m1423.l2649
I also saw this but it too needs an external iac housing..
http://www.ebay.com/itm/180810415357...84.m1423.l2649
any thoughts on these?
#29
Re: LT1 383 w/single plane conversion?
I've been checking out remote IAC's and thats not a route I'd like to go. What could I do with this throttle body to make one work? I have a friend who could probably weld a bung on this so I could screw one in for free.My question would be where at on the body could I do this with?
#30
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Re: LT1 383 w/single plane conversion?
You can really go without an iac valve. When MegaSquirt 1 came out had the car as my daily driver I ran without one on an HSR L98 in the winter and was fine. Even when I first start tuning something I don't use an iac valve until my spark and fuel maps are set well. So if you have the parts already I wouldn't worry too much. You can put one on there but it would be some drilling and welding and may or not be up to your standards. Again I really suggest going with an accel unit, not profab.
#31
Re: LT1 383 w/single plane conversion?
Ok then, i'll take your advice. I can't believe how expensive these blocks of aluminum go for,lol. From what I read on the "hurricane" thread that intake and rails might be the way I'm heading. I can port/clean up that intake fairly easily and for the price it doesn't seem like a bad unit. my biggest hurdle now is the throttle body and injectors. I have'nt decided whether to use 36lb injectors at 40psi or 42lb injectors at 30 psi. I checked the prices for injectors on southbay and damn near 400.00 bucks is kinda hard to swallow for injectors.
#32
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Re: LT1 383 w/single plane conversion?
Ok then, i'll take your advice. I can't believe how expensive these blocks of aluminum go for,lol. From what I read on the "hurricane" thread that intake and rails might be the way I'm heading. I can port/clean up that intake fairly easily and for the price it doesn't seem like a bad unit. my biggest hurdle now is the throttle body and injectors. I have'nt decided whether to use 36lb injectors at 40psi or 42lb injectors at 30 psi. I checked the prices for injectors on southbay and damn near 400.00 bucks is kinda hard to swallow for injectors.
and a calculator at: http://www.megamanual.com/v22manual/minj.htm
#33
Re: LT1 383 w/single plane conversion?
So I've been checking out regulators and I've come across a few I'd like to run by you guys. Here's the first I've seen and I like it do to everything you get with it.
http://www.ebay.com/itm/ADJUSTABLE-7...c2f5ba&vxp=mtr
This one looks like basically the same one with out the extra fittings..
http://www.ebay.com/itm/320991544462...84.m1423.l2649
ANother that looks promising..
http://www.ebay.com/itm/170644025649...84.m1423.l2649
I tried to get a used Kirban this morning but got outbid at the very last second...literally lol. So what do you guys think?
I have one more question. The car already has an AC delco TPI fuel pump in it now, will it be enough to feed my engine or would I have to upgrade to a 255?
http://www.ebay.com/itm/ADJUSTABLE-7...c2f5ba&vxp=mtr
This one looks like basically the same one with out the extra fittings..
http://www.ebay.com/itm/320991544462...84.m1423.l2649
ANother that looks promising..
http://www.ebay.com/itm/170644025649...84.m1423.l2649
I tried to get a used Kirban this morning but got outbid at the very last second...literally lol. So what do you guys think?
I have one more question. The car already has an AC delco TPI fuel pump in it now, will it be enough to feed my engine or would I have to upgrade to a 255?
Last edited by robertfrank; 02-20-2013 at 01:02 PM.
#34
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Re: LT1 383 w/single plane conversion?
FYI That Procomp throttle body/intake on ebay DOES have prevision for an IAC and the LT1 IAC fits perfectly. I know this because mine showed up today and that's the first thing I checked.
Jerry
Jerry
#39
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Re: LT1 383 w/single plane conversion?
Must be a new added feature to the Proform throttle body. I had one a few years back (7 years?) and it had no provision. Nice to see that they are listening to the public! Who was your seller on Ebay? I would like to see one that he is selling.
#40
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iTrader: (15)
Re: LT1 383 w/single plane conversion?
So I've been checking out regulators and I've come across a few I'd like to run by you guys. Here's the first I've seen and I like it do to everything you get with it.
http://www.ebay.com/itm/ADJUSTABLE-7...c2f5ba&vxp=mtr
This one looks like basically the same one with out the extra fittings..
http://www.ebay.com/itm/320991544462...84.m1423.l2649
ANother that looks promising..
http://www.ebay.com/itm/170644025649...84.m1423.l2649
I tried to get a used Kirban this morning but got outbid at the very last second...literally lol. So what do you guys think?
I have one more question. The car already has an AC delco TPI fuel pump in it now, will it be enough to feed my engine or would I have to upgrade to a 255?
http://www.ebay.com/itm/ADJUSTABLE-7...c2f5ba&vxp=mtr
This one looks like basically the same one with out the extra fittings..
http://www.ebay.com/itm/320991544462...84.m1423.l2649
ANother that looks promising..
http://www.ebay.com/itm/170644025649...84.m1423.l2649
I tried to get a used Kirban this morning but got outbid at the very last second...literally lol. So what do you guys think?
I have one more question. The car already has an AC delco TPI fuel pump in it now, will it be enough to feed my engine or would I have to upgrade to a 255?
Last edited by Tibo; 02-21-2013 at 06:24 PM.
#41
Re: LT1 383 w/single plane conversion?
Those that you have listed may work fine, I don't know. They are brand name chinese made knock-offs. But then again the procomp is a chinese made knock off that is a fine intake! I went with the Aeromotive AFPR and have been very happy with it. Also for the Fuel pump I reccomend the AC Delco fuel pump used in the Typhoons and grand nationals part number is . I use it after the good report/advice/findings of Dyno Don. It is a complete bolt in.
#42
Re: LT1 383 w/single plane conversion?
Well it's time again for an update, I got the intake together and mildly ported ( I truthfully think this intake is FAR better than the Vic efi) and here it is...
To make a long story short I port matched EVERYTHING that bolted to this intake. The throttle body, adapter plate, spacer, carb base and intake ports. The ports are matched to the stock LT1 intake gasket which is ridiculously close to a 1205 gasket. I think in the whole intake I have just a touch over 500 in it.
To make a long story short I port matched EVERYTHING that bolted to this intake. The throttle body, adapter plate, spacer, carb base and intake ports. The ports are matched to the stock LT1 intake gasket which is ridiculously close to a 1205 gasket. I think in the whole intake I have just a touch over 500 in it.
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