Blow Thru Turbo GTV

Started by BradGTV, October 07, 2009, 08:43:44 PM

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david sammartino

#30
October 12, 2009, 07:57:43 PM
60 bux for a tune is pretty good imo especially if they are going to synchronise them too. having said that i find it hard to believe they will get them right for 60 bux. it was always my impression that the reason some people didnt think much of the alfas back in the day was because of the fact that these cars were a little bit more tricky to get right, tuning wise, and the "she'll be right" attitude amongst certain mechanics. before i learnt to fiddle with these cars and whilst i was very young i too fell down this pit fall of paying the money and not having the car run much better.

Sheldon McIntosh

#31
October 12, 2009, 08:01:27 PM
Quote from: Storm_X on October 12, 2009, 06:51:54 PM
not cheap tho. for a non turbo rebuild kit and they recon the carbies like $220 each. i asked how much just to tune thay said $60 bux i was like wtf? just tue turn a few screws.

It's like anything buddy, you're not paying for them to turn a few screws, you're paying for their years of experience at turning screws.  Money well spent, $60 is F.A. for that service.

Storm_X

#32
October 12, 2009, 08:44:26 PM
Quote from: Sheldon Mcintosh on October 12, 2009, 08:01:27 PM
Quote from: Storm_X on October 12, 2009, 06:51:54 PM
not cheap tho. for a non turbo rebuild kit and they recon the carbies like $220 each. i asked how much just to tune thay said $60 bux i was like wtf? just tue turn a few screws.

It's like anything buddy, you're not paying for them to turn a few screws, you're paying for their years of experience at turning screws.  Money well spent, $60 is F.A. for that service.

im pretty sure they are ment to use special guages so every cylinder/carbie is exacltly the same but i think these guys will just turn the screws and then "oh yea she`ll be allite"
"Alfa Romeo built to excite.. Some dream of driving the ideal.. I drive it"

BradGTV

#33
October 16, 2009, 08:03:48 AM
finally some progress,
today i purchased a bradnew t3/t4 turbo, stainless exhaust manifold, and a boost gauge,
the manifold is of a old toyota motor but the seller said i was 5 mm out at eac end of the alfa head, so i will cut and reweld them so the maifold fitts and make a new flange,

i now have 2 options, either get a turbo rebuilt kit like this -  http://www.motorcyclecarbs.com/Dellorto_DHLA_Turbo_Conversion_P15508C2139.cfm   - for around $200 or bye a pair of turbo dellortos from bennicas for $480
what do u guys think??
brad
79 gtv sr20, 83 gtv, 83 gtv6 3.0, 75 ts x 3, 85 gtv, 76 gt, 91 164, Subey L Series, S13 silvia, Bmw e30 318i, VT SS 6spd

BradGTV

#34
October 18, 2009, 07:27:30 PM
i have most of my parts know and only a few issuses yet to address -
what do i do for ignition timing?? ??
electric dizzy?
will it be ok on the standard dizzy?
what does the turbodelta have?
please help me this is not my area of expertise,
brad
79 gtv sr20, 83 gtv, 83 gtv6 3.0, 75 ts x 3, 85 gtv, 76 gt, 91 164, Subey L Series, S13 silvia, Bmw e30 318i, VT SS 6spd

david sammartino

#35
October 18, 2009, 09:37:52 PM
just a quick note, you said the seller of the manifold said it was only a few mm off the alfa head spacings, but what about the head angle? for instance a twinspark head vs a nord head angle, the manifolds cant be interchanged. just make sure you double check this before you get down to bolting it up and find you cant use it after all. easier to do now rather than later.

Nicolas

#36
October 18, 2009, 09:41:26 PM
Good going Brad, I have read that the ozi Delta's had locked dizzy's, although I could be wrong.  I am considering doing the same upgrade to my 116 so will be watching your build eagerly.

May I ask how much you paid for your recent t3 turbo, manifold and boost guage purchase?

Cheers,
Nico
Never fast enough.

Darryl

#37
October 18, 2009, 11:15:23 PM
Nico,
Deltas were locked. Less bad (less destruction of pistons) than stock advance curve, but still bad (driveability sux).

Delta stock tune isn't great and will be less great as you make any change to anything else (turbo, manifolds, compression, anything)

Storm,  $60 tune is probably with about um - $60... You are kidding????

BradGTV

#38
October 19, 2009, 07:28:23 AM
since i have my other motor out at the momment i am using it to make a flange template, and looking at the alfa head is on a fair angle but this will only mean that the manifold will slant back as well, ans there are no clearence issues, and also with making a new flange i will prpopably have to cut up part of the manifold and get it re-welded so i can make alteraions to its design.

ok so i cant run my standaed dizzy as it wil give me bad driveability and more chance of detonation,
what is the silution?

i have decided to buy a turbo conversion kit from storm_x so the dellortos are all sourted out,

exhaust 2.5" or 3"??

the turbo and bits added up to ruffley $500 plus postage.
79 gtv sr20, 83 gtv, 83 gtv6 3.0, 75 ts x 3, 85 gtv, 76 gt, 91 164, Subey L Series, S13 silvia, Bmw e30 318i, VT SS 6spd

Storm_X

#39
October 19, 2009, 10:40:04 AM

u might need to heat and bend it to get the correct angle.

i dont think  u can run a stock dizzy. just look around for a electronic dizzy. i knew a guy that was selling one i will try to contact him for you want. oh and yea buy that jaycar unit and plug that to the electronic dizzy and tune it.

im going 2.5".  3" is to big i reckon
"Alfa Romeo built to excite.. Some dream of driving the ideal.. I drive it"

Darryl

#40
October 20, 2009, 12:06:45 AM
Get a quote from performance ignition services to take your dizzy and electronic-ify it including fitting boost retard. Buy a decent coil off them as well. It is simple and it works well enough.

What are you doing for fuel pump and regulator?

BradGTV

#41
October 20, 2009, 07:23:47 AM
darryl thanks for the advice i will look them up,
also that was my next question
what to do about fuel pump and regulator?
i have been told i need 1psi over my boost psi to stop the fuel getting pushed back up the lines is this correct?
do they make a regaltor that comes on with boost?
brad
79 gtv sr20, 83 gtv, 83 gtv6 3.0, 75 ts x 3, 85 gtv, 76 gt, 91 164, Subey L Series, S13 silvia, Bmw e30 318i, VT SS 6spd

Jekyll and Hyde

#42
October 20, 2009, 06:38:00 PM
Quote from: BradGTV on October 20, 2009, 07:23:47 AM

do they make a regaltor that comes on with boost?


Called a rising rate fuel pressure regulator.  Dunno if you can get them for carby systems though, normally used in EFI setups to replace the standard item....

Darryl

#43
October 20, 2009, 10:14:18 PM
You need something that will give you about 5psi (standard fuel pressure above atmo for a NA carb) and "track" boost - so a 1:1 regulator is what you want. Be careful though - you need to be able to set the pressure above boost down to that 5psi or so level - a rising rate reg designed for EFI will give you too much pressure. The "standard" thing to use for this job is a Malpassi regulator - they make a few different models, make sure you get one designed for a blow-through carb setup that will allow you to set the pressure this low. You need to feed that with a pump that will pump ok at a pressure a reasonable margin above the max boost you are running - but any reasonably rated EFI pump should do that.

OzMidnight

#44
December 09, 2009, 10:52:58 AM
Quote from: Storm_X on October 19, 2009, 10:40:04 AM
im going 2.5".  3" is to big i reckon

It most certainly isn't.  I know guys using them on 1.3 turbos for power gains over 2.5" systems.  Considering they are making 300 fwhp.......
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