Renault 5 GT Turbo tuning

BluntyR5GTT

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Points
67
From
stoke on trent
Car
R5 GT Turbo
Right first you'll have to set it to 18psi and take it for a drive with an AFR gauge attached, once you get an idea what the AFR's are like then you'll know where to mod the carb.
There's no set spec for T25@18psi but as a very rough guide i recon standard 1.2mm main jet, 1.2mm second stage jet and poss 1mm air corrector. You may find the carb either needs to be modded more or les then that depending what the AFR's say.
 

smithyr5

Wrench Pro
Points
26
From
warminster
Car
renault 5 gt turbo
hay bud. i have just had a bit of a knightmare. the car just died going down my local bypass. it did it the other day for a split second.
what happen was as i put my foot down a bit it lost power. as if it went from a 1.4 turbo to a 1.4

if its the turbo then i got a small problem. as i have the t25b but not the group a carb yet and cant aford the carb till end of the month.

any ideas?
 

smithyr5

Wrench Pro
Points
26
From
warminster
Car
renault 5 gt turbo
hi there.
rite i now have the turbo and the carbs coming sat. what ells am i going to need to fit this lot? gaskit kits and sealants and stuff.
 

BluntyR5GTT

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Points
67
From
stoke on trent
Car
R5 GT Turbo
sounds fuelling/timing related that problem does. id advise getting a carb rebuild kit and doing that whilst its off and yes get new gaskets etc always best to freshen things up. dont forget you need an oil change with a new turbo
 

smithyr5

Wrench Pro
Points
26
From
warminster
Car
renault 5 gt turbo
hay bud. done all that. had it rolling roaded. shes sweet as now. 130bhp and 130 pound of tourqe. at 15psi. so happy for now.
i need an alloy intercooler so i can turn it up a bit. its got a standerd inter at the mo so dont wana push it.
 

BluntyR5GTT

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Points
67
From
stoke on trent
Car
R5 GT Turbo
130bhp what turbo is that on t2 or t25 ? also is that at the wheels or flywheel as it seems a bit low ? have u got the standard ic strapped ? if i was you id get at least a double capacity ic on there asap
 

smithyr5

Wrench Pro
Points
26
From
warminster
Car
renault 5 gt turbo
yeah thats at the wheels. no havent got it straped just going to get the double ic payday.

y du think thats low?
and its a t 25 with a standard actuator.
 

obi_waynne

Administrator
Staff member
Moderator
Points
1,137
From
Deal, Kent UK
Car
A3 1.4 TFSI 150 COD
130bhp is not bad at all, and there is room for more so you can turn things up a bit when you want some more power.

Nice work though. Glad to see you've got it sorted.
 

smithyr5

Wrench Pro
Points
26
From
warminster
Car
renault 5 gt turbo
thats ok then was getting worried then. i have a ktech manafold to go on next month and the ic. so should wind it up a bit. have fitted a boost/blead valve under the bonnet but havent tuched it yet. dont wana blow the ic.
how do i get some pics up? photobucket??
 

BluntyR5GTT

Guest
Points
67
From
stoke on trent
Car
R5 GT Turbo
do not bother with a tubular manifold believe me they aint worth it on a 5 i did alot of research on this matter spend your money on a decent cam or something.

im not to sure on what your figure works out at the flywheel but @ 15psi at the fly on a t25 id imagine at least 165bhp and similar torque, ill have a check with a few of the lads see what they made when on a t25. whats the rest of the spec of your engine ? standard cam and head ?
 

smithyr5

Wrench Pro
Points
26
From
warminster
Car
renault 5 gt turbo
yeah as far as i know its all standard.
i have a print out in the paperwork i have from the past owner and it says 121 bhp then 167 at the fly.il take a pic of it and pop it on hear.

a mate that works at janspeed has a r5. thats out of this world.
he has told me there is around 40/50 loss through the transmition.wich is more than most other cars.

hes looking in to y its so much.

his is at 270 at the wheels at the mo. lol

tryd to put a pic on but its to big a file.il keep trying.
 

smithyr5

Wrench Pro
Points
26
From
warminster
Car
renault 5 gt turbo
hay bud
got me intercooler fitted. low temp thermostat. short shift gear linkage. car is sweeeet.

question for you.
why dose the r5 loose so much power through the transmition??
 

BluntyR5GTT

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Points
67
From
stoke on trent
Car
R5 GT Turbo
not sure of the real answer on that but try going on a dyno dynamics rolling road as there are the most accurate or even better a hub dyno. i do know 4x4 cosworths lose alot through transmission
 

BluntyR5GTT

Guest
Points
67
From
stoke on trent
Car
R5 GT Turbo
just a note to any r5gtt owner i can get turbos rebuilt to any spec for a very good price so please feel free to pm me and we can discuss an ideal turbo for your engine spec
 

BluntyR5GTT

Guest
Points
67
From
stoke on trent
Car
R5 GT Turbo
as the standard one is only 1,7mm and is no good for them power levels people just think changing the main and the a/c is key but in fact its more the 2nd stage and needle that need sorting.
 
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