Citroen AX 16v Turbo
Discussion
vrooom said:
Damn, 350hp in ax? I had a AX GT, that was a money pit. What brakes you running? i wouldnt mind a ax with big power.
Brakes are hi-spec ultralite 4 pots with DS3000 pads on 266mm Peugeot 206 diesel discs and braided lines with a bigger servo from a Saxo vts and 23mm master cylinder from a 406.Because of the lighter back end I only have 4 stud drums from the bigger Saxo diesel with mintex shoes. Disc brakes on the back are a tad overkill on an ax and they get very twitchy under hard braking.
FWDRacer said:
Would a more substantial cage be a good idea?
It was put in by previous owner and is fully welded and braced. If you mean the door bars are low and the driver side has extra bars where the seat is higher. The passenger seat is bolted to the floor with reinforced plates so sits very low anyway. When your in its pretty protective. The cage makes the car very solid at speed, its a better job than it looks to be fair bit I know what you mean.The car doesn't look pretty at all but its all very functional, it certainly doesn't look much!
Edited by e8_pack on Saturday 27th April 20:22
I have decided to upgraded the injectors to Siemens Deka 630cc which are the common upgrade for the megane R26. They have a better spray pattern than the yellow band pico's which are more suited for an 8v with one inlet so the jet sprays down the centre of the valve opening (single jet, aka pencil jet). Looking at the spray pattern on the standard pico's for the VTS it is a twin spray pattern so it sprays down the centre of each valve opening on a 16v car. The yellow band pico's will have been spraying into the centre bridge between the 16v head.
So
these new injectors should give me better atomisation than the pencil jet picos.
Will also have to revert back to a 3 bar fpr so i have better fuel control and idle.
So
these new injectors should give me better atomisation than the pencil jet picos.
Will also have to revert back to a 3 bar fpr so i have better fuel control and idle.
I also bought 2 Corbeau sprint seats. Both second hand but unused - 1 was used for mocking up purposes and the other was just bought and not used so i got them for a good deal. The FIA approval runs out soon though so wont be in date for long, but the car isn't up to standard anyway and is not a competition car.
I went to Demon Tweeks to try out some seat first and decided on an XL which is what they both are - the Corbeau Sprint came in this size.
I also bought 2 adjustable side mount brackets from Rally Design so i know they will fit the seats and give me some adjustment. It also takes the passenger off the floor which i hope he will appreciate for the ring trip! I was thinking of leaving him on the floor with the previous seat but it would have been uncomfortable for the lad and besides - i might share the driving... lol
I went to Demon Tweeks to try out some seat first and decided on an XL which is what they both are - the Corbeau Sprint came in this size.
I also bought 2 adjustable side mount brackets from Rally Design so i know they will fit the seats and give me some adjustment. It also takes the passenger off the floor which i hope he will appreciate for the ring trip! I was thinking of leaving him on the floor with the previous seat but it would have been uncomfortable for the lad and besides - i might share the driving... lol
The electrics side of things were a bit of a mess as well so martin went through the loom and cut it down - it appears like there were two looms joined together so at least there's a bit of weight saving there.
I'll be going through the car anyway and cutting a few things down to save more weight, still plenty to come out.
I'll be going through the car anyway and cutting a few things down to save more weight, still plenty to come out.
Well it's been to track n road and remapped with the DTA. The car held up well but we had to stop when adding boost at standard actuator pressure.
The VF35's are highly susceptible to boost creep and we got it in buckets! When the standard cat is removed on an impreza the extra flow creates a bigger pressure drop through the turbo than through the wastegate, so the boost pressure keeps feeding through the turbo hence the creep, and we have effectively achieved that through a bigger exhaust, so we had to stop there.
Porting of the wastegate is required to smooth the flow and open it up a little bit - also need a stronger actuator to hold the gate closed.
You can see the boost creeping, then spiking near the end of the graph - this is completely uncontrolled.
Glowing on the dyno:
The VF35's are highly susceptible to boost creep and we got it in buckets! When the standard cat is removed on an impreza the extra flow creates a bigger pressure drop through the turbo than through the wastegate, so the boost pressure keeps feeding through the turbo hence the creep, and we have effectively achieved that through a bigger exhaust, so we had to stop there.
Porting of the wastegate is required to smooth the flow and open it up a little bit - also need a stronger actuator to hold the gate closed.
You can see the boost creeping, then spiking near the end of the graph - this is completely uncontrolled.
Glowing on the dyno:
New Forge wastegate - i bought two springs - 7psi and 1 bar. Martin has now ported the wastegate and it's holding a rock solid 7psi all the way to the redline, so it's good to go for final mapping.
Unfortunately the EBC isn't working so no boost control beyond gate pressure so back to the internets:
New GFB G-Force EBC, seems pretty good with scramble modes and accurate boost control so that should do nicely.
Turns out, the new boost controller they sent is the latest updated one so bit of a win there.
Unfortunately the EBC isn't working so no boost control beyond gate pressure so back to the internets:
New GFB G-Force EBC, seems pretty good with scramble modes and accurate boost control so that should do nicely.
Turns out, the new boost controller they sent is the latest updated one so bit of a win there.
Pick it up tomorrow morning - will drive it over the weekend then take it back for final mapping next week - will use a slightly stronger spring at 1 bar as i think the wastegate is getting blown open slightly on the weaker spring.
Then i take it to the Nurburgring in a few weeks time.
I think this turbo will make a great street turbo but will probabl refit the TD04 for track as it provided much better spool response and less power which makes a more controlling drive.
Then i take it to the Nurburgring in a few weeks time.
I think this turbo will make a great street turbo but will probabl refit the TD04 for track as it provided much better spool response and less power which makes a more controlling drive.
That must be lively. I had a standard GT and although next to no power, there is next to no weight so performance is sprightly. With that motor in it must seriously shift!
I've seen the odd VTS converted GT in the classifieds and had a momentary think if I could justify another car especially as I was quite fond of my old GT
What are your aims with the car? It looked like almost track only then registering it for the road? Would be great to see that lump in a standard looking GT!
I've seen the odd VTS converted GT in the classifieds and had a momentary think if I could justify another car especially as I was quite fond of my old GT
What are your aims with the car? It looked like almost track only then registering it for the road? Would be great to see that lump in a standard looking GT!
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