MK1 Leon GT2x Build - thats it folks

[jamiebennett81]

right, the new MAF is fitted

lesson learnt, when ever there is a problem with the car, sleep on the problem and review it in the morning with a clearer head, that way you are a lot calmer and can focus better on the issue in hand instead of losing your temper

got some moler grips and also jammed a flat blade into the srew and between the two tools, got it out!

I then went out and it seemed to be restricted somehow, as in the boost slightly lethargic

so I got back, looked at the air filter and there was quite a lot of leaves stuck against the head of the air filter which had come up from the cold air feed

So I removed these and in the mean time, I fitted the new air filter (alot bigger). Car seems to be performing a lot better now, but will be keeping off the boost till I can get some proper logging done with Bill

getting there slowly.........

for reference, the old MAF was 1A and the new one was 2C?

 

[ibizacupra]

what time you coming tomorrow?

 

[m0rk]

What was the Man from Stonehouse's verdict?

 

[jamiebennett81]

well its been a long day and I have just got back, traffic was horrendous!!

so the day started at 07:30am for me, got to Bills around 10:15 and started work at 10:30 after a nice cup of tea

Bill got to work on the actuator, whipped off the old one and went to work on modifying the bracket to fit the Forge one

however, their was an issue, the yellow spring supplied by Forge with the actuator was supposed to hold 1bar, but it was only holding 9psi (should at least be holding 13psi)

we scratched our heads for a bit and then Bill tried combining a yellow and a green spring, put it back together and it shot way over 30psi......ok now its too stiff

after Bill finished testing the springyness by hand of some springs, we tried another yellow spring....this time it was holding 14psi - perfect

so Bill fitted this and wound out the actuator with approximately 4 turns. Went out for a test and despite boosting better, requested meeting actual, the boost was tailing off too quickly

Bill then removed the N75 and fitted the Forge MBC and wound it right out

went out for another spin, and it was hitting 1.4bar and holding till 1.1 till near redline, great! boost felt harder and alot smoother

next was removal of the N249 so I can get the satin rocker fitted at some point

all in all a great day and the car is working great, and now I have that silly grin factor on my face when planting my right foot!!

However......

on the way home, I have noticed as what I can only describe as surging......I put my foot down and although the boost is rising, it feels hesitant or as if there is a slight restriction, and other times I can put my foot down and she flies

the only think I can think of is the pipes leading from the TIP to the turbo. When Will from P-Torque fitted these he did comment these were not proper silicon hoses and were cheap crap and were quite soft.....I am wondering as now the turbo is hitting full boost if the pipes are expanding or slightly collapsing, causing this fluctuation in performance slightly?

anyway, massive thanks to Bill again (legend) and thank you for allowing me to have a much better understanding of compressor's, turbines and small and large port heads/intakes and how each of these components have to match to allow for the ultimate BT application - it was very interesting

 

[Damoegan]

Glad you have eventualy got all your problems sorted out mate.

 

[RobDon]

Sounds great - finally some good results!!!

Forge have really stiff silicone hose, worth replacing the rubbish ones for those, the poor hoses may be collapsing under boost. What sort of induction setup do you have?

FYI - on mine I use a machined ATP collar which takes the turbo entry out to 2.5" then a high temp rubber 2.5-3" elbow, the rubber is very stiff with no chance of collapse.

 

[jamiebennett81]

Sounds great - finally some good results!!!

Forge have really stiff silicone hose, worth replacing the rubbish ones for those, the poor hoses may be collapsing under boost. What sort of induction setup do you have?

FYI - on mine I use a machined ATP collar which takes the turbo entry out to 2.5" then a high temp rubber 2.5-3" elbow, the rubber is very stiff with no chance of collapse.

thanks guys

I have the ATP TIP setup, so 2.5" - 3" elbow to tip then 3" all the way to the induction kit

it was showing an improvement over the air intake of 184 was the highest reading, but I want to get it higher and not sure how really, as I know J@mes on his LCR was seeing something like 200, this I think was with an enclosed airbox with something like a 100mm air feed shoe horned in!

I thought of something else this morning on the way to work which may be another factor affecting the boost. Due to the increased boost, I know the DV could do with a good service, but also would it be worth changing the spring in this as well, as it is still running the standard spring from when the car was standard?

so.....apart from the DV and collapsing hoses, these are the only two aspects I think of which might be the cause of the slight boost issues

On a separate note - there was also ALOT of gunk at the front of the block more so to the right hand side of it covering all pipes etc, which Bill sprayed off with some brake cleaner, but this may be from too much pressure and oil being blown back into the crank case and leaking out, so I really must get a move on with my catch can setup

 

[RobDon]

I use the yellow spring in my 007P, seems to be the right one, no flutter and holds boost. Catch can is a good idea too yes, will keep the intercooler pipes alot cleaner too. I'm trying a, enclosed K&N Apollo kit just now, as it has a direct cold air feed off the foglight hole and cold air is being forced into the filter, haven't done any logs yet but it doesn't feel restrictive and it should raise the g/s figure.

 

[jamiebennett81]

I use the yellow spring in my 007P, seems to be the right one, no flutter and holds boost. Catch can is a good idea too yes, will keep the intercooler pipes alot cleaner too. I'm trying a, enclosed K&N Apollo kit just now, as it has a direct cold air feed off the foglight hole and cold air is being forced into the filter, haven't done any logs yet but it doesn't feel restrictive and it should raise the g/s figure.

thanks Rob

ok, I will have a look at the DV tonight

with your enclosed K&N apollo, how big is the filter inside? I presume it's like the Dynatwist kit that Bill sells?

does Bill sell a larger type dynatwist kit for the 3" intake?

 

[RobDon]

It's rated to 350bhp on turbo cars so will flow plenty.

 

[jamiebennett81]

It's rated to 350bhp on turbo cars so will flow plenty.

is it a 3" connection Rob?

 

[RobDon]

No 70mm, but this means that the airflow is accelerated in front of the MAF sensor, between that and the ram-air effect, should make for healthy g/s numbers. Only downside is that it's alot quieter!

 

[ibizacupra]

thanks Rob

ok, I will have a look at the DV tonight

with your enclosed K&N apollo, how big is the filter inside? I presume it's like the Dynatwist kit that Bill sells?

does Bill sell a larger type dynatwist kit for the 3" intake?

yep. dynatwists of every shape and size are available from me
thinking about yours and dpj's one, where dave spent ages reworking his tip and i think i remember him gaining airflow as a consequence. several changes of direction,ection and size in the atp intake, and with soft hoses, there may be depression and intake losses, which in turbo terms would be exaggerated on delivered boost. (magnified)

its a laggy unit which gets going in the mid to high 3krpm... the new 2871 i fitted to the octy today, spools very similarly but with a lot more power when it comes in.

effecient intake is important.


also added 6 degrees more timing to yours as it was very conservative

 

[jamiebennett81]

yep. dynatwists of every shape and size are available from me
thinking about yours and dpj's one, where dave spent ages reworking his tip and i think i remember him gaining airflow as a consequence. several changes of direction,ection and size in the atp intake, and with soft hoses, there may be depression and intake losses, which in turbo terms would be exaggerated on delivered boost. (magnified)

its a laggy unit which gets going in the mid to high 3krpm... the new 2871 i fitted to the octy today, spools very similarly but with a lot more power when it comes in.

effecient intake is important.


also added 6 degrees more timing as it was very conservative

ok thanks Bill, so you recommend changing the silicon hoses for some proper ones? what size Dynatwist would you recommend?

 

[ibizacupra]

ok thanks Bill, so you recommend changing the silicon hoses for some proper ones? what size Dynatwist would you recommend?

the filter you are running has plenty of size for your power levels..
tip pipework inc hoses for something which is stiffer that cant suck in or distort cant hurt, but the tortuous path is more likely the problem. not a quick fix tho on 6spd box/cable. dpj had to get quite creative to make his work.

LCR XL Dynatwist has 80mm intake, and maf size.. XXL is the biggie but would'nt fit with your battery still in std position.

 

[ibizacupra]

What was the Man from Stonehouse's verdict?

i wont be running out and getting a gt2x anytime soon for MrsB lupo (ko3s on that car would rip the hell out of a gt2x leon, power/weight) .

seen a few gt2x now for various jobs inc mapping.

not my fave turbo. as laggy as a little BT but without the payback of high power.
i can see its appeal, as it promises to deliver, but out of the box from atp it simply does'nt

by the time you spend reworking things if not able to diy, you are into proper bt money for a different league performance.

if a k03s all of a sudden power delivery was'nt your bag, and sustained higher revving more progressive power delivery suits you then gt2x may hit your spot. it does have a little more top end than k03s but looses far more low down than it gives back up top

 

[jamiebennett81]

i wont be running out and getting a gt2x anytime soon for MrsB lupo (ko3s on that car would rip the hell out of a gt2x leon, power/weight) .

seen a few gt2x now for various jobs inc mapping.

not my fave turbo. as laggy as a little BT but without the payback of high power.
i can see its appeal, as it promises to deliver, but out of the box from atp it simply does'nt

by the time you spend reworking things if not able to diy, you are into proper bt money for a different league performance.

if a k03s all of a sudden power delivery was'nt your bag, and sustained higher revving more progressive power delivery suits you then gt2x may hit your spot. it does have a little more top end than k03s but looses far more low down than it gives back up top

indeed, lesson learnt, its a $hit turbo, but could not swap the whole kit, so had to flog a dead horse so to speak

agreed, money spent could have got a similar priced kit but ALOT more power, but we live and learn I guess, it will do for now, disappointing results

when it goes I will be going gt28/30 etc

 

[caveo]

If it goes id look at a IHI / garret hybrd or something else with good spool.

 

[HTC]

I don't see how a stiffer DV spring would help. If it's fitted in the normal configuration boost pressure acts on the side of the piston rather than underneath. I've had mine up to 30psi on the forge green spring.

If you have dirt and crud in this area on the front of the block you may have a split pipe. Your configuration may be different to mine, but worth checking.

I lost some boost through the leak.

 

[Daz_gibbo]

hence gt28/30