1.9 Gti Rebuild Planning Twin Carbs & Piper 285 Cam

[Gtautotech 1]

I have a 1.9 gti that i plan to rebuild, I've already got my 285 piper camshaft, and want some info on what type of Twin 45's to buy and ideal sizes of main jets & Chokes to order them with as i will be buying brand new carbs

 

And ive heard you should skim the head to increase the compression ratio, But how much

 

Any info greatfully received

[vince 0]

I've got that in mind too, just curious about the consumption, how thirsty is the car with such a modification?

 

vince

[205mattgti 0]

i am running webber twin 45s dcoe on my 1.9 8v with some mods

 

Carbs can be a little thirsty, it all depends how u drive it

 

lol

[Gtautotech 1]

205mattgti - What jets and chokes you running and what sort of bhp you getting

[Gtautotech 1]

Matt if your only in salisbury i wouldn't mind meeting up to have a look at yours to make my mind up what to do

 

If you fancy it!

[shine 0]

Hi.

 

I have twin 45 DCOE on my 8v. PT27 cam and cr 11:1. Cousumption is about 1 to 1,2 litre per 10 km on ordinary road driving, BUT on track it can be way more. Last race, 40 rounds of 1900meters (qualifying and 2 races), was about 35 liters.

 

My jets works well both on track and on road driving, (a bit rich in top end.)

Chokes 36mm

low 60F8

Acc 45

Air 155

Main 165 (could go down one step if main use is road)

 

Had prev 40mm chokes but some struggeling at low rpm, and only 1 to 3 more bhp at top end. Response during whole powerband is much better with 36 ones.

 

Good luck with rebuild, I prommisse You would love the sound.

 

Espen

[Gtautotech 1]

First thing i need to do is get my bottom end and crank checked to see if itcan be reground or not, fingers crossed it can

[205mattgti 0]

Matt if your only in salisbury i wouldn't mind meeting up to have a look at yours to make my mind up what to do

 

If you fancy it!

 

 

 

i would have to look up which choke sizes etc am using

 

on the last rr i had done it came in at 154 bhp with 148 ft lb or torque

 

 

pm sent about meeting up

[richystran 7 3 Cars]

i had my 205 running on twin 45's with a gas flowed head and a kent cam and had 150.5 bhp. Not sure about choks etc

[ashley peddle 3]

just see it as smiles per gallon (as you wont get many miles)

[205mattgti 0]

just see it as smiles per gallon (as you wont get many miles)

 

 

 

lol

 

 

 

thats very true

 

 

Gtautotech when u wanna meet up

Edited December 18, 2006 by 205mattgti

[Dino 3]

Do yourself a favour and get some TBs on there.

 

My mate has twin 45s on his and he is forever tweaking them. The car runs differently day to day.

 

Pain in the butt.

Edited December 18, 2006 by Dino

[205mattgti 0]

my carbs arnt to bad, i have only had them set up again once the new engine was run in

 

 

otherwise apart from the huge fuel bill, they have been ok

[Guest justinhincks87]

when you say you have 150 bhp. do you mean at the wheels or flywheel?

[205mattgti 0]

at the flywheel

[Brambles 0]

Do yourself a favour and get some TBs on there.

 

My mate has twin 45s on his and he is forever tweaking them. The car runs differently day to day.

 

Pain in the butt.

 

For what its worth I had 45 webbers with a longman inlet manifold on my 205 Mi16 and spent quite a bit of time changing chokes, jets, air correctors etc, which got a bit expensive.

 

To be fair I never got it set up on a rolling road except when i went down to Emerald to get one of there M3D Ecu's and a set of Jenvey throttle bodies.

 

Once on the roling road I found out what I had suspected that it was running at around 10:1 Air fuel ratio and only leaned out (11.5:1!), at the top end eventually produsing 167 Bhp at 7186 rpm.

 

I got the Webbers thinking it was the cheaper otion over Tb's and mappable Ecu but I personally think it would have been better to have started of with Tb's etc.

[Malachy 0]

Once on the roling road I found out what I had suspected that it was running at around 10:1 Air fuel ratio and only leaned out (11.5:1!), at the top end eventually produsing 167 Bhp at 7186 rpm.

 

you are the man responsible for this "climate change" then

 

as said above really i would never run carbs purely on the basis that with fuel injection you have so much more refinement, its setup for optimal warmup optimal fuel economy at cruising sites and then at high load peak power, you cant do this with carbs (well not easily) and its always a sacrifice or common ground between them.

 

im currently changing a jensen healey (2l 16v lotus engine with twin dellortos) of mine over to fuel injection along with a spartan kit car (based on a triumph spitfire) mainly for these reasons and the fact i seem to have got an addiction to megasquirt

Edited January 8, 2007 by Malachy