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VT 5L into HQ sedan
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Big Al Offline
#1 Posted : Wednesday, 18 November 2009 7:18:37 AM(UTC)
Big Al

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Hi all,

I was originally going to drop a new 350SBC/T400 combo into my HQ. But have been thinking lately about retiring my VT 5L Berlina and using the running gear from that instead. The Ballerina is complete, she is currently my daily drive. Nothing really wrong with it, but I just want something a bit newer and cheaper on fuel for my daily ride. And I know Ill get virtually nothing for it as a trade-in.

Would this seem like a reasonable conversion. I'd probably leave it injected for drivabilily and maybe a bigger cam when I give it a freshen up.

As the car is 100% complete are there any other bits I could use on the conversion ie. brakes or anything?

Cheers for any info! Al.
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Utility8 Offline
#2 Posted : Wednesday, 18 November 2009 8:40:57 AM(UTC)
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I gotta say Im surprised that you dont hear about more of this type of conversion. The injected motor & TH700 would breathe a heap of life into a HQ. As many guys are slipping them into earlier Holdens with great success, I dont see any draw backs for a HQ. Of the Commodore running gear, injected motor, trans & diff (if width is suitable), would be ideal. Getting it all in is the easy bit. Setting up the fuel system & wiring layout can be tricky to get right. HQ brakes would be fine maybe upgrading to the Commodore rear discs perhaps but not necessary. Im a big fan.

Utility8
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we wreck 81837s only Offline
#3 Posted : Wednesday, 18 November 2009 9:18:55 AM(UTC)
we wreck 81837s only

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after a big block into HQ, this is my next favorite swap, its esay as, use HQ pan and pick up, pacemaker make pipes(ph5500)wiring now is dead easy, use ECU from VN and get it modded, fuel pump set up is also easy now, you can buy that set up usually from whoever does/supplies your ECU, use early type VN T700R with cable kickdown, relocate battery as cold airbox fits neatly into area where HQ have the battery. p/steer and a/con brackets all easy fit up or make for A/C. easy swap and awesome, you will never look back. if ya dont do that, put a big block in it, even better.

just read again and its a VT you have, not a VN, that means if you run the 4L60E, you will need a memcal or brain to drive that as well. if you use VT ECU ,you will have to scramble or redo all the codes such as airbag and BCM for anti theft, ABS and all that crap that they have, and delete the key settings, or else you have to use the column out of the commodore(like alot of guys do with early holdens, they use floors and dashes and columns out of VTs now in FE-FC), a bit more involved, thats why its easier to use a VN as a donor car, still very good swap tho. VT has independant rear, so nothing else bar engine/trans really not rear end

I innovate, never imitate..

Edited by user Wednesday, 18 November 2009 9:26:25 AM(UTC)  | Reason: Not specified
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commodorenut Offline
#4 Posted : Wednesday, 18 November 2009 4:42:01 PM(UTC)
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Just get someone to redo the memcal to remove the VATS, and the PCM will be fine without the BCM & keyreader.
It will cost no more than a couple of hundred $$ at most.

Id use the VT engine, box & engine loom (with some minor parts of the car loom as required), but retain the rest as HQ.

Radiator would be up to you - a HQ rad will be fine, but if you can go to the effort of making up brackets like a WB rad, then Id fit the VT radiator & thermo-fans as a complete unit.

Cheers,

Mick
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Cheers,

Mick
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Judge a successful man not on how he treats his peers, but on how he treats those less fortunate.
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we wreck 81837s only Offline
#5 Posted : Wednesday, 18 November 2009 5:59:13 PM(UTC)
we wreck 81837s only

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there ya go, Mick has cleared it up, so use your VT eng and trans, easy!!

I innovate, never imitate..
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Big Al Offline
#6 Posted : Wednesday, 18 November 2009 7:17:48 PM(UTC)
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Yeah it seems pretty logical as I already have the car (Ive had it for about 5 years) and hasnt skipped a beat. *touch wood*

Id think Id probably try and get the VT radiator to work, so I can use the thermos, seeing as I already have them.
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Dr Terry Offline
#7 Posted : Wednesday, 18 November 2009 8:08:23 PM(UTC)
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Yes, as Mick has said, use all the VT stuff & then just get the VATS (immobiliser program) removed from the memcal. The rest has been explained.

The one item which often gets overlooked is the a/cond compressor. The original VN-VT compressor will foul the HQ-WB steering box, so you will need a new mount kit made if you want a/cond.

Dr Terry.
If at first you don't succeed, just call it Version 1.0
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Big Al Offline
#8 Posted : Wednesday, 18 November 2009 8:13:06 PM(UTC)
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This might be one for the DPI, but would I need to run all the smog gear. The car is pre-smog, but the motor isnt, and Im guessing its going to throw all sorts of error codes?
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Dr Terry Offline
#9 Posted : Thursday, 19 November 2009 2:31:45 AM(UTC)
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quote:
Originally posted by Big Al
This might be one for the DPI, but would I need to run all the smog gear. The car is pre-smog, but the motor isnt, and Im guessing its going to throw all sorts of error codes?

What smog gear ??

The beauty of computerised EFI is that most of that old anti-pollution gear is obsolete. I use a complete Commodore fuel tank in my conversions, that gives you a good quiet fuel pump & proper venting. Other than a carbon canister & cat, what gear is there. There is no EGR & no unnecessary vacuum plumbing. Certainly nothing electronic that with throw error codes.

Dr Terry
If at first you don't succeed, just call it Version 1.0
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playwme Offline
#10 Posted : Thursday, 19 November 2009 3:35:52 AM(UTC)
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quote:
Originally posted by Dr Terry
I use a complete Commodore fuel tank in my conversions, that gives you a good quiet fuel pump & proper venting.

Dr Terry


Good idea.

Is there much work to make the Commodore tank fit or is it just a case of reworking some brackets and shoving the tank in the standard HQ-HZ spot?
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Dr Terry Offline
#11 Posted : Thursday, 19 November 2009 4:28:29 AM(UTC)
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Its a bit of fiddle because of the rework of the filler. Basically you need to remove & blank off the original filler pipe & use the HQ filler tube welded in the HQ. Rearrange the vent hose fittings as you do the welding. The original straps will hold the Commodore Tank in the same spot as the HQ tank, you just need to use some Brooker rod to extend where the old bolts were.

Use a normal V6 tank, the V8 tank is too big & will hang too low.

Dr Terry
If at first you don't succeed, just call it Version 1.0
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we wreck 81837s only Offline
#12 Posted : Thursday, 19 November 2009 5:24:07 AM(UTC)
we wreck 81837s only

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and the pacemakers even have the O2 sensor bungs welde in place...ohh yeah

I innovate, never imitate..
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Big Al Offline
#13 Posted : Thursday, 19 November 2009 6:47:14 AM(UTC)
Big Al

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quote:
Originally posted by Dr Terry
What smog gear ??


Yeah I was referring to the cats mainly.
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Big Al Offline
#14 Posted : Thursday, 19 November 2009 6:50:25 AM(UTC)
Big Al

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quote:
Originally posted by Dr Terry
Its a bit of fiddle because of the rework of the filler. Basically you need to remove & blank off the original filler pipe & use the HQ filler tube welded in the HQ. Rearrange the vent hose fittings as you do the welding. The original straps will hold the Commodore Tank in the same spot as the HQ tank, you just need to use some Brooker rod to extend where the old bolts were.

Use a normal V6 tank, the V8 tank is too big & will hang too low.

Dr Terry


Are you talking about a metal tank? Because the Commodore one is plastic.
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Dr Terry Offline
#15 Posted : Thursday, 19 November 2009 7:53:10 AM(UTC)
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Sorry I should have clarified that. Commodore VB to VS have a metal tank & VN onwards have an integral swirl pot with high pressure pump.

Only VT onwards have the polypropylene tank.

Dr Terry
If at first you don't succeed, just call it Version 1.0
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