Author Topic: Main Jet QUESTION  (Read 5928 times)

BladeGT

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Main Jet QUESTION
« on: 21:21, Sun 12 February 2006 »
Which one of this two types of jets is the main jet  :?:  the big one or the small..



What size will fit when running at 1.1 bar  :?:

10x for the information

jure

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« Reply #1 on: 07:46, Mon 13 February 2006 »
Big one is main jet and small is air corrector. :wink:

BladeGT

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« Reply #2 on: 09:48, Mon 13 February 2006 »
Aha.. so if i want to replace the main jet do i need to open the carb..  or this jet is the one on the outer side of the carb. And which size is good for pressure about 1,2 ?

u-r-o-s

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« Reply #3 on: 11:38, Mon 13 February 2006 »
I have to do the same thing, replace or just "bored" a main jet. Now the question is how to increase bore diameter?

Anybody know for a good internet page, about tuning an gtt?

jure

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« Reply #4 on: 14:19, Mon 13 February 2006 »
Do not raise boost over 0.9-1.0 bar because head gasket won't cope with it. For around 0.9 bar best jeting is 135 main and 90 air corrector (instead standard120/125 main and 120 air corr.)


The air corrector is removed (in the middle)


Unscrew this part and inside is main jet


Remove Main jet with standard screwdriver

jure

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« Reply #5 on: 14:22, Mon 13 February 2006 »
You must take off carb because main jet is turned towards engine cover and there is no possibility to put in screwdriver to remove it.

UROS if you want another main jet go to any local carb mechanic and ask main jet (glavnu diznu za dovod goriva) za Solex DIS32 :wink:

Do not bore out  jets because they cost around 2 euros and for boring out 1.35mm you need special screw. If you just slightly bore too much few liter of petrol are burning for nothing.

BladeGT

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« Reply #6 on: 16:37, Mon 13 February 2006 »
i'm using a handmade uprated gasket made by cooper. I think that 1.1 -1,2 BAR is possible. But i'm going to put  a cockpit boost regulator form 0.5 to 1,1 for example. What do you think?

P.S. Thanks for the information about the JETS. All that photoes.. you're great.

One more question, Ok the main jet is geting bigger from  125 > 135  but why the air regulator is getting smaller. ?

jure

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« Reply #7 on: 16:43, Mon 13 February 2006 »
If you have aftermarket head gasket with more tensile head bolts there won't be any problems. Purpose of cockpit boost regulator is to make scale of boost whatever you want so there is no rule :wink:

Air corector weakens the mixture at the top end of the rev scale. So car is more "stronger" on high revs (because changing only main jet car becomes "stronger" on low revs)

BladeGT

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« Reply #8 on: 16:49, Mon 13 February 2006 »
That sounds logical. i'm not sure that anione wil have larger main jets for renault.. it's possible only if there are bigger for example on the 1,7 liter carb or somthing..  ot i must go and make them by hand at the local  hardware. Not sure about the results.

How much this will increase the the fuel consumption?

jure

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« Reply #9 on: 08:47, Wed 15 February 2006 »
There wasn't any problem getting the. In my local carb and injection service the had all sizes (120,125,130,135,140 and 145) of main jets. They were brand new so obeveus there is supplyer for them.

Part Number of original Renault 135 main jet that was fitted on Renaul 18 turbo
7701 026 392

It is straight fit on GTT's

jure

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« Reply #10 on: 08:49, Wed 15 February 2006 »
Expected conusmtion can be between 1-2 liters but only under really fast driving and turbo kicking all the time (after changing jets be sure that you measure air-fuel ratio)

BladeGT

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« Reply #11 on: 09:50, Wed 15 February 2006 »
OK, Thanks I'll try wit one 135 Fuel and 90 air corector and readjust the car. I think that will give me  a little power) More fuel, more power:) hehehe

turbak

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Re: Main Jet QUESTION
« Reply #12 on: 10:51, Mon 12 December 2016 »
Hellou can somebody know the air corrector part number for renault 5 gt turbo i need original part number,thanks